IEEE Antennas and Propagation Magazine (IEEE ANTENN PROPAG M )

Publisher: IEEE Antennas and Propagation Society, Institute of Electrical and Electronics Engineers


Covers all areas relating to antenna theory, design, and practice; propagation, including theory, effects, and system considerations; analytical and computational electromagnetics, scattering, diffraction, and radar cross sections; and all relationships of these areas to applications, including telecommunications, broadcasting, electromagnetic effects in systems, and design and measurement techniques.

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    IEEE Antennas and Propagation Magazine website
  • Other titles
    IEEE antennas & propagation magazine, Institute of Electrical and Electronics Engineers antennas & propagation magazine, Antennas & propagation magazine, IEEE antennas and propagation magazine, Antennas and propagation magazine, AP-S magazine, IEEE Antennas and Propagation Society magazine
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    Periodical, Internet resource
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    Journal / Magazine / Newspaper, Internet Resource

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Institute of Electrical and Electronics Engineers

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: [accepted for publication, publication expected June 2015] Ionospheric radio wave propagation can be used to bridge hundreds of kilometers with a direct radio link. This makes ionospheric radio communication a practical solution for information transport in regions that have no telecommunication infrastructure, or for disaster relief operations in areas where the telecommunication infrastructure is destroyed by a natural catastrophe. Ionospheric radio wave propagation adds fading to the received signal, decreasing the link reliability and throughput, which may be countered with diversity reception. Effective diversity reception may be obtained by adapting the polarization of the receive antenna to the characteristic waves propagating in the ionosphere, thereby creating two independent propagation paths from transmitter to receiver. This article describes a method to measure the isolation between these paths and demonstrates its effectiveness in a Near Vertical Incidence Skywave (NVIS) experiment on a frequency of 7 MHz over a 105 km distance. Characteristic wave isolation exceeding 25 dB is measured during the 'Happy Hour': the interval when the propagation path just opens or closes and only the extraordinary wave propagates. The use of circular polarization promises significant improvement of NVIS diversity reception or MIMO (Multiple Input Multiple Output).
    IEEE Antennas and Propagation Magazine 06/2015;
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    ABSTRACT: [accepted for publication, publication expected June 2015] Near Vertical Incidence Skywave (NVIS) communication uses the ionosphere as a reflector to cover a continuous area with a radius of at least 150 km around the transmitter, on frequencies typically between 3 and 10 MHz. In developing countries – in areas lacking any other telecommunication infrastructure – it is used on a daily basis for voice and data communication. It may also be used in ad-hoc emergency (disaster) communication in other regions. This paper proposes optimum heights above ground for horizontal dipole antennas for NVIS, based on simulations and empirical data. Firstly, the relationship between elevation angle and skip distance is obtained using ionospheric ray tracing. The high elevation angles found by simulation are confirmed by elevation angle measurements using a professional Radio Direction Finder. The measurements also show the dominance of NVIS over ground wave propagation starting at a short distance. For these elevation angles, the optimum receive and transmit antenna heights above ground are derived using antenna simulations. A distinction is made between optimum transmit signal strength and optimum received signal-to-noise ratio. These optima are verified experimentally, demonstrating a novel evaluation method that can be used in the presence of the fading typical for ionospheric propagation. For farmland soil (sigma = 20mS/m, 17 Er = 17) the optimum height above ground for the transmit antenna is 0.18 − 0.22 lambda . If the antenna is lowered to 0.02 lambda a transmit signal loss of 12 dB occurs. This corresponds with the theory. The receive antenna height, however, while appearing uncritical in the simulations, showed a clear optimum at 0.16 lambda and a 2-7 dB SNR deterioration when lowered to 0.02 lambda.
    IEEE Antennas and Propagation Magazine 01/2015;
  • IEEE Antennas and Propagation Magazine 12/2014; 56(6):217-218.
  • IEEE Antennas and Propagation Magazine 10/2014; 56(5):91-100.
  • [Show abstract] [Hide abstract]
    ABSTRACT: (accepted, not published yet)
    IEEE Antennas and Propagation Magazine 10/2014;
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    ABSTRACT: Received signal level measurements are frequently used to check the performance and the Quality Of Service (QOS) inside the coverage area in cellular networks. These expensive time consuming measurements are carried out using actual drive tests to assess the coverage area of a base station for a given cell and thus evaluate the QOS. In a drive test measurement system, a receiving antenna is placed on top of a vehicle and the vehicle is then driven along radial and circular lines around the base station to measure the received power and thus assess the QOS. These drive test measurements are also used to tune the empirical models in the radio planning tools which have to be carried out for various types of environments. This model tuning is a lengthy procedure. In this paper, it is shown that an electromagnetic macro modeling of the environment can provide simulation results comparable to the data as one would obtain in an actual drive test measurement for a cellular environment. The input parameters for the electromagnetic macro model can be generated using only the physical parameters of the environment like the height of the transmitting and receiving antennas over the ground, their tilts towards the ground, and the electrical parameters of the ground. Such analysis can provide realistic plots for the received power versus separation distance between the receiving and the transmitting base station antennas. The novelty of the electromagnetic analysis technique proposed in this paper lies in its ability to match the macro model-based simulation results and the drive test measurements without any statistical or empirical curve fitting or an adhoc choice of a reference distance. In addition, a new concept called proper route is introduced to enhance the analysis of the measured data. A method of moments-based integral equation solver code has been used to simulate the effects of the macro parameters of the environment on the propagation path loss of the signals emanating from a base station antenna. The perfect match between the simulation results and the drive test data is illustrated by monitoring the signal levels from some cellular base stations in western India and Srilanka and then comparing the observed results with the simulated results. The goal here is to illustrate that these numerical simulation tools can accurately predict the propagation path loss in a cellular environment without tweaking some non-physical models based on statistical modeling or heuristic assumptions.
    IEEE Antennas and Propagation Magazine 08/2014; 56(4):108 - 129.
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, the infl uence of the topology and morphology of a particularly complex scenario on the deployment of ZigBee wireless sensor networks is analyzed. This complex scenario is a car. The existence of loss mechanisms, such as material absorption (seats, dashboard, etc.), and strong multipath components due to the great number of obstacles and the metallic environment (bodywork), as well as the growing demand for wireless systems within a vehicle, emphasize the importance of the confi guration of heterogeneous intra-car wireless systems. Measurement results, as well as simulation results by means of an in-house three-dimensional ray-launching algorithm, illustrate the strong infl uence of this complex scenario on the overall performance of the intra-car wireless sensor network. Results also show that ZigBee is a viable technology for successfully deploying intra-car wireless sensor networks.
    IEEE Antennas and Propagation Magazine 08/2014; 56(4):232-245.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Design of antennas for metal mountable radio-frequency identification tags is driven by a unique set of challenges: cheap, small, low-profile and conformal structures need to provide reliable operation when tags are mounted on conductive platforms of various shapes and sizes. During the past decade, tremendous amount of research has been dedicated to meet these stringent requirements. Currently, the tag read ranges of several meters are achieved with flexible label type tags. Moreover, a whole spectrum of tag size-performance ratios has been demonstrated through a variety of innovative antenna design approaches. This article reviews and summarizes the progress made in antennas for metal mountable tags and presents future prospects.
    IEEE Antennas and Propagation Magazine 06/2014; 56(1):79.
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    ABSTRACT: Wireless body-centric sensing systems have an important role in the fields of biomedicine, personal healthcare, safety, and security. Body-centric radio-frequency identification (RFID) technology provides a wireless and maintenance-free communication link between the human body and the surroundings through wearable and implanted antennas. This enables real-time monitoring of human vital signs everywhere. Seamlessly integrated wearable and implanted miniaturized antennas thus have the potential to revolutionize the everyday life of people, and to contribute to independent living. Low-cost and low-power system solutions will make widespread use of such technology become reality. The primary target applications for this research are body-centric sensing systems and the relatively new interdisciplinary field of wireless brain-machine interface (BMI) systems. Providing a direct wireless pathway between the brain and an external device, a wireless brain-machine interface holds an enormous potential for helping people suffering from severely disabling neurological conditions to communicate and manage their everyday life more independently. In this paper, we discuss RFID-inspired wireless brain-machine interface systems. We demonstrate that mm-size loop implanted antennas are capable of efficiently coupling to an external transmitting loop antenna through an inductive link. In addition, we focus on wearable antennas based on electrically conductive textiles and threads, and present design guidelines for their use as wearable-antenna conductive elements. Overall, our results constitute an important milestone in the development of wireless brain-machine interface systems, and a new era of wireless body-centric systems.
    IEEE Antennas and Propagation Magazine 06/2014; 56(1):271.
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    ABSTRACT: Soon after this issue of the Magazine reaches you, all members of the IEEE Antennas and Propagation Society (AP-S) will have an opportunity to vote in at least two elections: the AP-S election for AdCom members and President Elect, and the IEEE election. If this year is similar to previous years. indeed, previous decades. depending on where they live, less than 14% to 34% of AP-S members will vote. That's sad. It also means that the vast majority of AP-S members must not really care about any of the following: ?? What new conferences the Society organizes ?? Where the Society's conferences are held ?? What publications the Society publishes ?? Who is Editor-in-Chief of those publications ?? How much money is spent supporting Chapters, and in what form ?? How much money is spent supporting students ?? What other benefits are offered to members Those are just a very few of the issues the Society's elected representatives have voted on this year, and typically make decisions about each year. If you don't vote for the people who make these decisions, then your preferences regarding these issues are not represented.
    IEEE Antennas and Propagation Magazine 06/2014; 56(3):12-12.
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    ABSTRACT: A new characterization technique for metamaterials is presented for measuring electric-field patterns. The electric-field frames are obtained through a thermoemissive film, located in the near-field domain of the metamaterial. Using an infrared camera, sub-wavelength details can be identified. We applied this technique to antennas based on composite right/left-handed transmission lines (CRLH TLs), also called zeroth-order-resonator (ZOR) antennas. The electric-field distributions of zeroth-order-resonator antennas at frequencies corresponding to longitudinal modes between 4 GHz and 12 GHz were determined. These field frames were in agreement with numerical results obtained by finite-element analysis. This paper addresses techniques for the experimental validation of numerical computations.
    IEEE Antennas and Propagation Magazine 06/2014; 56(3):37-42.
  • [Show abstract] [Hide abstract]
    ABSTRACT: The Microwave Lab in the Electrical Engineering Department of the Penn State University (PSU) was recently dedicated in a ceremony organized by the College of Engineering. Figure 1 shows the plaque along with excerpts from the official press release (Figure 2), delivered by Dean Atchley of the Penn State College of Engineering (COE). Prof. Aydin, head of the EE Department, also said a few kind words about my sixteen years at Penn State, where I migrated from the University of Illinois in 1996.
    IEEE Antennas and Propagation Magazine 06/2014; 56(3):188-191.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Three-dimensional (3-D) frequency-selective structures are a recent development that exhibit superior filtering responses compared to conventional two-dimensional (2-D) frequency-selective surfaces. A three-dimensional frequency-selective structure typically comprises a two-dimensional periodic array of multimode cavities the modes of which and the coupling of which with air can be controlled to obtain a desired frequency response. Based on their distinct configuration, we seek to classify them as a separate class of high-performance frequency-selective structures, and to highlight their unique features in this paper. We also present a review of recent advances in three-dimensional frequency-selective structures, and suggest a number of related research topics for future exploration.
    IEEE Antennas and Propagation Magazine 06/2014; 56(3):43-67.