Science topic
Antennas and Propagation - Science topic
antennas, including analysis, design, development, measurement, and testing; radiation, radio propagation, and the interaction of electromagnetic waves with discrete and continuous media; and applications and systems pertinent to antennas, propagation, and sensing, such as applied optics, millimeter- and sub-millimeter-wave techniques, antenna signal processing and control, radio astronomy, and propagation and radiation aspects of terrestrial and space-based communication, including wireless, mobile, satellite, and telecommunications
Publications related to Antennas and Propagation (396)
Sorted by most recent
Smakula Y.I., Klymash M.M. (supervisor). Research and Design of Concealed Antennas for Radio Communications. Master thesis. – Lviv Polytechnic National University, Lviv, 2025.
Extanded abstract
Modern mobile radio communication and radio access networks are characterized by high demands for communication quality, reliable coverage, and efficient us...
Electromagnetics, radio frequency (RF), microwave, and antenna engineering are generally viewed as highly theoretical subjects, with a notable decline in student interest. This paper introduces a student-centred laboratory exercise for electromagnetic courses, developed as part of an IEEE Antennas & Propagation Society Educational Initiatives Progr...
Reviewer (Conferences), IEEE Int’l Conf. on Recent Progresses in Science, Engineering and Technology, 2024, Bangladesh, IEEE Int’l Conf. on Innovations in Science, Engineering and Technology, 2024, Bangladesh. IEEE Int’l Conf. on Teaching, Assessment and Learning for Engineering, 2024, India. IEEE Technology and Engineering Management Society Conf....
To render realistic material appearances, physically based models often rely on the microfacet theory. These models require several parameters that drive the distribution of microfacet orientations, their reflectance, and a geometric attenuation factor. The latter accounts for self-masking and self-shadowing; it must be managed carefully when physi...
![The block diagram of the setup for the 1st\documentclass[12pt]{minimal}...](publication/383266522/figure/fig2/AS:11431281272733900@1724210251523/The-block-diagram-of-the-setup-for-the-1stdocumentclass12ptminimal_Q320.jpg)
Millimeter wave (mmWave) technologies at 60 GHz and 100 GHz bands are currently gaining significant attention for its potential to meet the demanding needs of next-generation networks. These include ultra-high data rate, ultra-low latency, high spectral efficiency, and high end-to-end reliability. However, mmWave signals’ blockage remains a critica...
Call for Papers and Reviewers: 2024 8th IEEE Symposium on Wireless Technology & Applications (ISWTA2024) – HYBRID CONFERENCE
20 - 21 July 2024, Concorde Hotel, Kuala Lumpur, Malaysia
Dear Valued Participants,
ISWTA2024 invites paper submissions from diverse participants, including researchers, academicians, engineers, and scientists from univers...
Cellular networks are becoming increasingly complex, requiring careful optimization of parameters such as antenna propagation pattern, tilt, direction, height, and transmitted
reference signal power to ensure a high-quality user experience. In this paper, we propose a new method to optimize antenna direction in a cellular network using Q-learning....
CLIMARCSEC is a new Project within the 2023-24 project cycle of the Multinational Capabilities Development Campaign (MCDC), forming a US-led partnership of 23 nations/IGOs, to create nonmateriel capabilities to support multinational force operations and exercise by resolving or at least diminishing common military problems. With Norway as project...
Call for Papers and Reviewers: 2023 IEEE Symposium on Wireless Technology & Applications (ISWTA2023) – HYBRID CONFERENCE
15 - 16 August 2023, Hotel Maya, KLCC, Kuala Lumpur, Malaysia
Dear Valued Participants,
ISWTA2023 invites paper submissions from diverse participants, including researchers, academicians, engineers, and scientists from univers...
Microstrip patch smart antenna is modelled for millimetre wave frequency application to improve the performance of antenna in terms of gain and bandwidth. In particular, beam steering antennas have become quite common in contemporary antenna propagation. Because it reduces noise, conserves energy, and improves the bandwidth and gain of the microstr...
We report on the analysis of pure gadolinium oxide (Gd2O3) and its detection when mixed in surrogate nuclear debris using microwave-enhanced fiber-coupled micro-laser-induced breakdown spectroscopy (MWE-FC-MLIBS). The target application is remote analysis of nuclear debris containing uranium (U) inside the Fukushima Daiichi Nuclear Power Station. T...
![Figure 1. Block diagram of a UAV system. Source: Hartmann and Steup [1].](publication/367620500/figure/fig1/AS:11431281116237654@1675196599030/Block-diagram-of-a-UAV-system-Source-Hartmann-and-Steup-1_Q320.jpg)
![Figure 6. Spoofing attack illustration. Source: Liu, et al. [29].](publication/367620500/figure/fig5/AS:11431281116218011@1675196600427/Spoofing-attack-illustration-Source-Liu-et-al-29_Q320.jpg)
This paper discusses the vulnerabilities of perimeter surveillance unmanned aerial vehicles to cyber-physical security threats and discusses some approaches to manage them, as most cyber threats to the UAVs coming through their onboard wireless transceiver, we are suggesting an Antennas propagation type that limit the vector of the threat, also the...
The Expanded Giant Metrewave Radio Telescope (eGMRT) [1] proposal aims at increasing the Field-of-View (FoV) of the GMRT antennas by a factor of 25 using a Focal Plane Array (FPA) and beamforming system. As part of the initial proposal, an optimized FPGA-based prototype beamformer is designed and tested in the free-space test range located at the G...
The micro-motion target can perform micro-Doppler modulation on the electromagnetic wave due to motion components in different directions, leading to the defocus effect of the target imaging feature along the azimuth direction. This phenomenon has been widely concerned and investigated in the field of target recognition and anti-recognition. Howeve...
Performance testing under realistic propagation channel conditions is essential for virtual drive testing (VDT), where radio channel emulators are typically employed in the laboratory for such applications. Optimal allocation of tap resources in the channel emulator is critical in hardware-in-the-loop emulation of radio channels due to the constrai...
A multi-element, multi-beam aperture array beamforming system is being developed as part of the Expanded GMRT (eGMRT) project. This prototype system is a part of the proposal aimed at improving the scientific capabilities of the Giant Metrewave Radio Telescope (GMRT), one of the most sensitive instruments in the world for observing celestial object...
In-band full duplex (IBFD) is regarded as one of the most significant technologies for addressing the issue of spectrum scarcity in 5G and beyond systems. In the realization of practical IBFD systems, self-interference, i.e., the interference that the transmitter causes to the collocated receiver, poses a major challenge to antenna designers; it is...
Rapid advances in antennas, propagation, electromagnetics, and materials are opening new and unexplored opportunities in body area sensing and stimulation. Next-generation wearables and implants are seamlessly providing round-the-clock monitoring. In turn, numerous applications are brought forward with the potential to ultimately transform healthca...
Dear Valued Participants,
ISWTA2022 invites paper submissions from diverse participants, including researchers, academicians, engineers, and scientists from universities, industries, government agencies, research institutions, and corporations. Submissions are welcome that address solutions to problems in all areas of :
Communications
Wireless &...
In this study, we present an ultra-wideband full-duplex system constituted of a wideband 4-element Vivaldi array and wideband microstrip-to-slotline baluns. The proposed system is characterised by its simplicity, high directivity, and high self-interference cancellation levels over a wide frequency bandwidth. The system is fabricated using basic pr...
This paper presents a high-gain leaky-wave antenna based on a resonant cavity (RC) structure with the capability of unidirectional beam scanning over predefined frequencies and desired beam angles. Frequency scanning is achieved by implementing a properly-designed single-layer partially reflective surface (PRS) based on a simple ray tracing-based d...
Methods for modelling the radar scattering characteristics of resonance-size airborne objects containing metallic and dielectric design elements are discussed. The developed algorithms are based on solving Fredholm second-kind boundary integral equations (IEs) that place them within the context of the method of analytical regularisation. The magnet...
Large scale (i.e. <10 m) and small scale (i.e. 1 × 1× 1 cm) measurements and characterization of a scattered wireless channel with different antenna polarizations and configurations in the underground mine galleries at 60 GHz are addressed. Results show that the rough surface scattering and the gallery dimensions affect the path loss (PL) exponent...
We derive novel closed-form analytic functions for the near-field electromagnetic (EM) spatial power density distributions for flat or patch antennas. Our derived functions enable us to analytically describe how the EM field generated from such antennas propagates in space, allowing us to quantify the radiation power density at any point in space....
In this paper, the performance of UAV-based mmW links is investigated when UAVs are equipped with square array antennas. The 3GPP antenna propagation patterns are used to model the square array antenna. It is shown that the square array antenna is sensitive to both horizontal and vertical angular vibrations of UAVs. In order to explore the relation...
This paper presents a new low-power and low-phase noise Colpitts quadrature voltage-controlled oscillator (QVCO). The proposed QVCO contains two differential Colpitts VCOs that use gain-boosting technique to enhance the negative transconductance and relax start-up condition. Both switching and tail transistors are configured in class-C to improve I...
This paper presents a new low-power and low-phase noise Colpitts quadrature voltage-controlled oscillator (QVCO). The proposed QVCO contains two differential Colpitts VCOs that use gain-boosting technique to enhance the negative transconductance and relax start-up condition. Both switching and tail transistors are configured in class-C to improve I...
Since the structural vibration deformation of a large antenna under wind disturbance leads to the pointing deterioration, an adaptive anti-wind disturbance system was presented by Liang et al. (Int. J. Antennas Propag., Article ID 2015341, 2019). To further improve the vibration suppression performance, this paper presents a locations-optimization...
This article presents the progress in the development of the telecommunication subsystem for the Mars Helicopter. The antenna performance on the rover and the helicopter are assessed. An in-depth analysis of the link between the Mars Helicopter and the Mars 2020 (M2020) rover is presented in detail, including the impact of polarization loss, multip...
Recently, the use of millimeter wave (mmW) frequencies has emerged as a promising solution for wirelessly connecting unmanned aerial vehicles (UAVs) to ground users. However, employing UAVassisted directional mmW links is challenging due to the random fluctuations of hovering UAVs. In this paper, the performance of UAV-based mmW links is investigat...
The next generation of wireless networks will feature a more flexible radio access design, integrating multiple new technological solutions (e.g., massive Multiple-Input Multiple-Output (MIMO), millimeter waves) to satisfy different verticals and use cases. The performance evaluation of these networks will require more complex models to represent t...
Das Buch behandelt die verschiedenen numerischen Feldsimulationsverfahren, nichtlineare Schaltungstechnik und deren S- und X-Parameter sowie modernste Leistungsverstärkertechniken. Weiterhin werden neuartig dargestellte Oszillatoren und das große neue Feld der GHz-Plasmatechnik beschrieben. Darüber hinaus deckt es mit den Themen Hohlleiter, Mischer...
In antenna propagation waves should be guided from leakages and directionality which has became more essential now a days due to number of hurdles which scatters the signal. In this paper we design a leaky lens antenna of UWB frequency and simulate that using CST tool in parallel plate waveguide that works efficiently in high frequency range of 6-3...
The next generation communication system, typically referred to as the fifth generation (5G), is currently under global intensive research and development in industry, academia and governmental organisations. The new 5G cellular systems are envisioned to achieve better performance, e.g. higher data rate, better energy efficiency, and higher reliabi...
in recent day’s communication technology has increased in every field where in antenna propagation transmission of signals to the other end is dependent on antennas. This propagation should be appropriate in both the fields as near and far fields for effectively covering which RFIDs are used which abbreviate as radio frequency identification which...
PACS number: 95.55.-Jz
Purpose: Technical capabilities of the MARK-4B antenna system necessary for its further using as a 32-meter radiotelescope (RT-32) and making simultaneous spectral radioastronomical observations in the C and K frequency ranges, are investigated.
Design/methodology/approach:The studies use the results of our own measurements...
PACS number: 95.55.-Jz
Purpose: Creating a radio telescope based on the MARK-4B antenna system being developed for telecommunication applications, determining the possibilities of using the broadband multirange operation of a beam wave-guided antenna system and to
evaluate the antenna characteristics using the radioastronomical measurements.
Desi...
Cellular-connected unmanned aerial vehicles (UAVs) are recently getting significant attention due to various practical use cases, e.g., surveillance, data gathering, purchase delivery, among other applications. Since UAVs are low power nodes, energy and spectral efficient communication is of paramount importance. To that end, multiple access (MA) s...
A 10‐element multiple‐input multiple‐output (MIMO) handset antenna array with triple‐band operation in the long‐term evolution band 42 (3400‐3600 MHz), band 43 (3600‐3800 MHz), and band 46 (5150‐5925 MHz) is studied in this article. Acceptable antenna performances are obtained by using polarization and pattern diversity techniques. To assess the mu...
![FIGURE 4. Topology of a 3D folded UWB microstrip antenna. [20] 2012 IEEE.](publication/326725071/figure/fig4/AS:665836780019712@1535759267811/Topology-of-a-3D-folded-UWB-microstrip-antenna-20-2012-IEEE_Q320.jpg)
Ultrawideband (UWB) technology can provide short-range, high bandwidth communications at a very low energy consumption level, which is quite attractive for wireless body area networks (WBAN). In such a system, the presence of the human body brings huge challenges for both the design of the wearable antenna and the propagation model. First of all, t...
Although a lot of research has been done into radar based heartbeat detection for the last years, it is still unknown which physiological effects truly underlie these measurement signals. This paper investigates the cardiovascular system as well as the effects due to the antenna characteristics and establishes a connection to the variety of heartbe...
RADAR is an electromagnetic system for the detection and location of target objects such as aircraft, ships, spacecraft, vehicles, people, and the natural environment which can reflect a signal back. It uses electromagnetic radio waves to determine the angle, range, or velocity of objects. RADAR was developed by various nations before and during Se...
RADAR is an electromagnetic system for the detection and location of target objects such as aircraft, ships, spacecraft, vehicles, people, and the natural environment which can refl ect a signal back. It uses electromagnetic radio waves to determine the angle, range, or velocity of objects. RADAR was developed by various nations before and during S...
Wireless body area networks (WBAN) have been a trending topic in recent years because of their important applications in military, sports and wellness industries. E-textile antennas and circuits show great potential to implement WBANs due to their low mass, physical flexibility and ease of integration with garments. Many techniques and materials ha...
The detection of emerging technologies is vital for R&D managers and policymakers; hence, the bibliometric approach to analyzing papers and patents was developed. In this study, we proposed a new method, the research classification schema (RCS). We used citation network analysis to classify technologies into four categories: change-maker, breakthro...
![3 RC measurement parameters at the University of Liverpool [46-48].](profile/Ping-Jack-Soh/publication/306081464/figure/tbl1/AS:785631764545539@1564320617476/3-RC-measurement-parameters-at-the-University-of-Liverpool-46-48_Q320.jpg)
This chapter presents the design, development, and evaluation procedures for textile antennas. It overviews the types of textiles (conductive and non-conductive) and explains the characterization procedure using a commercial setup prior to the proposal of a systematic antenna fabrication procedure. In experiments, measurement of the reflection coef...
This chapter presents the engineering components of the radio spectrum management and standardization. To achieve a rational, equitable, efficient, and economical use of the radio frequency (RF) spectrum by all radio communication services, it is essential to understand the technical aspects of wireless media. The chapter analyses the characteristi...
In winter season due to low visibility our railway system not work smoothly. To remove the problem for this season we are going to design a railway driving system which can act in fog independently without seasonally variation. For this communication, we will use RF communication. So, control room personnel will be aware of the railway traffic as w...
CONTACT: ECE Department, AIACT&R, Govt. of DELHI- 110031 M -09811962830, yaduvanshirs007@gmail.com
RESEARCH AREA: DIELECTRIC RESONATOR ANTENNAS, RF, MICROWAVE AND EMBEDDED SYSTEMS.
Experience: 33 Years (Academia, Industry, Research and Publication, International Public Speaking ,
Consulting and Project Implementation /Management)
Qualifications: Ph...
This article provides 28 GHz and 73 GHz urban
omnidirectional propagation path loss data measured in downtown
New York City during the summers of 2012 and 2013, and 38
GHz data measured in downtown Austin in the summer of 2011.
The data provided herein may be used by antenna, propagation,
and communications researchers for emerging mobile and/or ba...
Wideband (WB) and ultrawideband (UWB) systems combined with multiple-input multiple-output (MIMO) technology increase both the systems performances and the complexity of the channel models required to evaluate their capabilities. Because in real scenarios waves propagate nonisotropically, the accuracy of the channel model is increased if nonisotrop...
The Bayesian inference framework for design introduced in Chan and Goggans [“Using Bayesian inference for linear antenna array design,” IEEE Trans. Antennas Propag., vol. 59, no. 9, pp. 3211-3217, Sep. 2011] is applied to design linear antenna arrays capable of realizing multiple radiation patterns while satisfying various design requirements. Many...
Current research topics and research facilities at A&P-Leiria research group of Instituto de Telecomunicações, Portugal.
Recently, a novel high-order finite-element space for wires, quadrilaterals, and hexahedrons was presented [M. Kostic and B. Kolundzija, “Maximally Orthogonalized Higher Order Bases Over Generalized Wires, Quadrilaterals, and Hexahedra,” IEEE Trans. Antennas Propag., vol. 61, no. 6, pp. 3135–3148, 2013]. Numerical results have shown a very favorabl...
The method of moments (MoM) has been developed and widely used for solv-ing electromagnetic scattering and radiation problems. The major disadvan-tage of the MoM is that it has O(N 2) computational and storage complexities, which result in a large memory requirement and a tremendous amount of computation time (J.-M. Jin, Theory and Computation of E...
Diffraction is an all-present phenomenon associated to the spreading of the transverse profile of a traveling wave. During the years, several works have shown the possibility to define invariant or non-diffractive solutions of the Helmholtz equation to limit the diffraction spreading in a certain region of space known as non-diffractive zone. Among...
Automated antenna optimization remains a promising technique in computer aided design and a number of works in this area have been published in the past years. Song and Murch, “An efficient approach for optimizing frequency reconfigurable pixel antennas using genetic algorithms,” IEEE Trans. Antennas Propag., vol. 62, no. 2, pp. 609–620, is a new c...
We present a quantitative analysis of a dipole antenna and its characteristics from the viewpoint of quantum mechanics. The method makes use of a Maxwell equation used in an existing antenna propagation formula. This includes radiation resistance, input reactance, and antenna efficiency as functions of frequency and antenna length. Particular atten...
We consider the Casimir interaction between two spheres in
$(D+1)$-dimensional Minkowski spacetime due to the vacuum fluctuations of
scalar fields. We consider combinations of Dirichlet and Neumann boundary
conditions. The TGTG formula of the Casimir interaction energy is derived. The
computations of the T matrices of the two spheres are straightfo...
Based on the idea of additional modified mode(s) (Mahdy et al., IEEE Antennas Wirel Propag Lett 10:869–872, 2011), metamaterial-loaded triple-band rectangular patch antennas have been reported in (Mahdy et al., Prog Electromagn Res Lett 21:99–107, 2011). But the idea of additional modified mode(s) to achieve multiband performance in circular patch...
This paper presents a novel band-notched circular CPW antenna for ultrawideband (UWB) communication in WiFi and WiMAX applications. The antenna is designed for 3.1-10.6 GHz and added some lower frequencies to this band by novel notch method. This paper applies band-notched antenna method in order to design two lower frequencies in antenna at 2 GHz...
It gives us, on behalf of the Organising Committee, great pleasure to welcome you to the 2013 Loughborough Antennas & Propagation Conference (LAPC 2013).
In this paper a derivation of the attenuation factor in a waveguide with stochastic walls is presented. The perturbation method and Fourier analysis are employed to derive asymptotically consistent boundary-value problems at each asymptotic order. The derived approximation predicts the attenuation of the propagating mode in a rough waveguide throug...
This paper presents the design and analysis of a 10-element 2.4 GHz Yagi antenna using the Method of Moment inculcated in an electromagnetic simulation software called SuperNec v2.9. The Yagi antenna is an example of a directional antenna. The antenna propagates electromagnetic field energy in the direction running from the driven element toward th...
This paper presents a two-layer mushroom-like reactive impedance surface (RIS) and its application to patch antenna miniaturization. RIS, known as meta-substrate, have shown the ability to miniaturize printed antennas with omni-directional radiation pattern, when served as the substrate for the antenna (H. Mosallaei and K. Sarabandi, IEEE Trans. An...
We study the Casimir interaction between a sphere and a cylinder both
subjected to Dirichlet, Neumann or perfectly conducting boundary conditions.
Generalizing the operator approach developed by Wittman [IEEE Trans. Antennas
Propag. 36, 1078 (1988)], we compute the scalar and vector translation matrices
between a sphere and a cylinder, and thus wri...
Export Date: 20 June 2013, Source: Scopus, Art. No.: 6276225, :doi 10.1109/LAWP.2012.2214371, Language of Original Document: English, Correspondence Address: Lam, H.Y.; Department of Radio Communication Engineering, Faculty of Electrical Engineering, Universiti Teknologi Malaysia (UTM), Skudai 81300, Malaysia; email: lamhongyin@ieee.org, References...
A frequency-dependent impedance model for laminated ferromagnetic cores is presented and analyzed. The model assumes a multiple-winding ferromagnetic induction core composed of multiple thin layers with linear material response. This model builds on the analysis presented by Rose et al. [Phys. Rev. ST Accel. Beams 13, 090401 (2010)], that determine...
The U.S. Army Research Laboratory (ARL) conducted experiments using amplifiers and an array of antennas to characterize the propagation of radio frequency (RF) signals at White Sands Missile Range (WSMR), NM. The amplifier/antenna systems were put together by Raytheon in Tucson, AZ. The systems are comprised of FM radio transmitters and six-element...
Conference code: 87252, Export Date: 13 July 2012, Source: Scopus, Art. No.: 6050806, doi: 10.1109/URSIGASS.2011.6050806, Language of Original Document: English, Correspondence Address: Lam, H.Y.; Department of Radio Communication Engineering, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Skudai 81310 Johor, Malaysia; email: lam...
A new approach of remote sensing for buried bodies by means of reflected pulses is presented in this article. This method
is based on the concept of a scattered field’s analytical continuation (Zaridze et al. in IEEE Trans Antennas Propag 50(1):50–58,
4). Soil properties were deduced using data processing and these properties analyzed. Computer sim...
In this paper, the information extracted from Single-Input Multiple-Output sounding measurements is used to study the effect of several aspects of the receive antenna arrays on system performance. The extracted multipath parameters are used to synthesize the MIMO channel matrices of a hypothesized communication system having a fixed microcellular b...
In this paper an approach based on the calculation of longitudinal and transverse operators is presented. The paper is devoted to the interesting topic of electromagnetic-wave propagation in complex (chiral) media. The studied process allows the analysis of guidedstructures with chiral-medium components. In this case the equations are continuously...
Orthogonal frequency division multiplexing (OFDMA) offers great spectrum efficiency and flexible frequency allocation to users without intra-cell interferences in LTE system. However, the cell edge users will experience high interferences from neighbouring cells. Many frequency reuse schemes have been proposed for improving the Signal to Interferen...
The decomposition of the time reversal operator (DORT method) is applied to electromagnetic waves in order to characterize a dielectric cylinder. It consists in determining the Time Reversal Invariants of the Time Reversal Operator. Here, this matrix is built from the inter-element responses between distinct transmit and receive arrays. In this pap...
The following topics are dealt with: tag circuits; measurement method; simulation method; health care; protocol; sensors; open source RFID software; privacy; security; reader design; antenna; propagation; near-field electromagnetic ranging.
The dB is an important and widely used concept in relation to antennas, propagation, and other areas. However, its usual definitions contain idiosyncrasies that hamper clear understanding and symbolic calculation, thereby reducing general applicability to far below its potential. A novel perspective replaces the common view - namely, the dB as a un...
This paper appears in: Antennas & Propagation Conference, 2009. LAPC 2009. Loughborough
Issue Date: 16-17 Nov. 2009
On page(s): 449 - 452
Location: Loughborough
Print ISBN: 978-1-4244-2720-8
INSPEC Accession Number: 11008695
Digital Object Identifier: 10.1109/LAPC.2009.5352551
Date of Current Version: 11 December 2009
Abstract
In this pape...
This communication presents a calibration method of an indoor UWB sub-band deterministic channel model by means of simulated annealing. Based on the characterization of the channel at sub-bands with a subset of measurement locations, the calibration optimizes the dielectric material parameters of the environment, which improves the accuracy of the...
This paper appears in: Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2009 3rd IEEE International Symposium on
Issue Date: 27-29 Oct. 2009
On page(s): 1019 - 1022
Location: Beijing
Print ISBN: 978-1-4244-4076-4
INSPEC Accession Number: 11021857
Digital Object Identifier: 10.1109/MAPE.2009.5355854
Date of Cu...
In this paper, an innovative approach for the synthesis of sub-arrayed monopulse linear arrays is presented. A compromise difference pattern is obtained through an optimal excitations matching method based on the contiguous partition technique integrated in an iterative procedure ensuring, at the same time, the optimization of the sidelobe level (o...
A metal-mesh achromatic half-wave plate (HWP) has been designed, manufactured, and tested for potential use in millimeter and submillimeter astronomical instruments. The prototype device presented here is based on a 12-grid Shatrow [ IEEE Trans. Antennas Propag. 43, 109 (1995)] recipe to operate over the frequency range of 120 – 180 GHz . Transmiss...
The impact of non-straight movements of a mobile station (MS), for example rotation of the MS, on the statistics of a wireless propagation channel needs to be studied in the modern literature of wireless channel modelling. The authors formulate the effects of MS rotation on a cross-correlation model for a multiple-input multiple-output Rayleigh fad...
A local plasmon resonance on a metal wedge is studied by using the Meixner approach [J. Meixner, IEEE Trans. Antennas Propag. AP-20, 442 (1972)] . It is found that the singular field behavior of a local plasmon resonance as a function of the distance from the edge of the wedge is sensitive to the wavelength and wedge angle, and ranges from a dramat...
In this paper, we discuss antennas and propagation aspects in current passive UHF RFID systems. We consider a "reader-tag-reader" link and concentrate on each part of it: reader antennas, propagation channel, and tags. We include channel modeling equations and support our discussion with experimental measurements of tag performance in various condi...
This paper describes the investigation of antenna characteristics of split-ring resonators (SRRs). Antenna propagating at terahertz (THz) region which varies from 0.1 to 10THz is very useful mainly for medical purposes. In order to have antenna propagating at terahertz region, square SRRs which have negative permittivity and permeability are design...
Particle Swarm Optimization (PSO) is an effective, simple and promising method intended for the fast search in multi-dimensional
space [Kennedy and Eberhart, "Particle Swarm Optimization", Proc. of the 1995 IEEE International Conference on Neural Networks, 1995]. Besides special testing problems a number of engineering tasks of electrodynamics were...
The present authors reply to comments by Meng et al. (IEEE Trans Antennas Propag., vol.55, pt.II, p.1016-17 March 2007) on the original paper by Hrabar et al. (IEEE Trans. antennas Propag., vol.53, p.110-19, Jan. 2005)
Recently, several approaches have been proposed to incorporate double-negative media into finite-difference time-domain simulators. In this letter, a rigorous comparative study of the formulation introduced by Karkkainen and Maslovski and the bilinear frequency approximation technique applied by Feise (IEEE Trans. Antennas Propag., vol. 52, pp. 295...
Accurate characterization of multiple-input multiple-output (MIMO) fading channels is an important prerequisite for the design of multiantenna wireless-communication systems. In this paper, a single-bounce two-ring statistical model for the time-varying MIMO flat fading channels is proposed. In the model, both the base and mobile stations are surro...
Based on TDR-measured and FDTD-computed time-domain data, an efficient and systematic approach has been proposed to extract the SPICE-compatible models of the power delivery networks. The extracted models accurately account for the resonance behavior of the power/ground planes over a wide frequency band. Computa-tion and measurement verifications c...
Replies to the comment of Nadarajah and Kotz (IEEE Trans, Antennas Propag., vol.54, no.11, p.3570-3571, 2006 November) on the original paper by Salo et al. (IEEE Trans. Antennas Propag., vol.54, p.639-43, 2006 February)
For original paper by Hristov et al., see IEEE Trans. Antennas Propag., vol.53, p.1912-19 (2005 June)
