Junping Geng

• Professor
• Shanghai Jiao Tong University

A deception jamming method for wideband linear frequency modulation radar based on time-modulated array (TMA) is proposed in this letter. Different from other real-time modulation jamming methods using metasurface, the real-time modulated method based on TMA where the system consists of discreet components of passive antenna, LNA and analogy switch...

In this paper, a novel four-port phase mode antenna (PMA) with multi-polarization beam scanning capability is proposed. By adjusting the phase difference between feeding ports, the four-port PMA can excite different phase modes allowing for multi-polarization beam scanning. It is observed that the even mode and odd mode, the basic modes of the PMA,...

A miniaturized dual-port phase mode antenna (PMA) based on radial SSPPs structure with continuous scanning pattern and two kinds of 1-D linear extended arrays of it are proposed. The proposed PMA is composed with a vertical PCB (0.28λ×0.27λ) printing the SSPPs scatterer and the feeding loop of two isolated ports and a metal ground. Two independent...

A novel compact wideband load-bearing planar inverted-F fishbone antenna (PIFFA) element and a circularly polarized (CP) unit based on PIFFA are proposed. The main radiator of the PIFFA is a folded fishbone structure with dimensions of 0.14λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.1...

Unmanned aerial vehicles (UAVs), serving as small mobile platforms, are well-suited for emitter detection and localization tasks in dynamic environments. However, implementing large antenna array apertures on the compact platform of UAVs is impractical. This paper presents a small-aperture phase mode antenna (PMA) direction-finding (DF) system for...

A broadband biomimetic antenna inspired by avian rib structures is presented. The antenna is composed of an arched dipole and two pairs of asymmetrical L-shaped stubs, along with dielectric materials conformally embedded to match the contour of avian ribs. Characteristic mode analysis is employed to analyze the operation of the antenna, revealing t...

A symmetric tri-port phase mode antenna (PMA) based on radial SSPPs structure and two kinds of 1-D linear arrays of it are proposed with extended 2-D scanning characteristics. The proposed tri-port PMA is composed of a horizontal metal ground, a parallel circular PCB (0.28λ×0.28λ) and feeding pillars connecting them. The radial SSPPs scatterer and...

The general model of a dual-port phased antenna with a reflector is investigated. And a novel dual-port monopole antenna with corrugated structure above a HIS with a size of 0.30λ×0.39λ×0.16λ is proposed. The antenna can work in single-port excitation mode with main lobe deflecting to ±39° and dual-port excitation mode with main lobe scanning from...

A novel tri-port phase mode antenna is proposed for wide-angle and polarization scanning, along with a one-dimensional (1-D) linear generalized phased array for two-dimensional (2-D) space ( xoz -, yoz -, and xoy -planes) scanning and polarization scanning. To produce continuous beam scanning characteristics, the phase difference (Δφ) between...

A wideband circularly polarized periodic leaky-wave antenna (PLWA) using a novel unit cell with X-shaped slot is proposed. The X-shaped slot is fed by a 50- $\Omega $ microstrip line with an X-shaped stub closely on top of it. Furthermore, an equivalent circuit of the proposed unit cell is established and verified. Approaches are introduced to enh...

This chapter mainly propose the generalized principle of pattern multiplication and give the details of the connotation of the key concepts and boundary. By comparing the performances of the omnidirectional antenna, dipole and the ideal phase mode antenna, the array based on the phase mode antenna performs high gain and large angle beam scanning.

In this chapter, a phase mode SSPPs antenna with dual port is proposed, its mian lobe can scan in the 3D space. Based on the generalized principle of pattern multiplication, the phase mode SSPPs antenna is extended to three kinds of 1D arrays with different arrangements. By changing the generalized array factor (GAF) and generalized element factor...

This chapter mainly discusses the electromagnetics essential characteristics of the phase mode antenna and the mathematic principle of the generalized principle of pattern multiplication. The phase mode slots aperture unit is designed, and its main lobe can scan in space with the phase difference between dual ports of the aperture. The extended 1D...

This chapter introduces the basic principle of phased array and some key characters. The traditional principle of pattern multiplication is the foundation of the phased array, in which the array factor is the key to beam scan. People try to widen the beam width of the antenna to realize the wide angle scanning array, and our two examples are given.

The design of a high-efficiency single-sideband (SSB) time-modulated (TM) module is introduced, and the factors affecting the efficiency of the TM module, including harmonic efficiency, modulation utilization efficiency of radio frequency (RF) signal, and circuit efficiency, are discussed theoretically. To verify the theoretical analysis, a $C$ -...

A single-sideband time modulator (SSBTM) with a wide bandwidth of one decade ( $R$ $=$ 10) is presented in this article. The proposed SSBTM is based on a periodically controlled wideband 2-bit switched-type phase shifter (STPS). With periodic phase modulation and on–off amplitude control, it can realize an equivalent 6-bit amplitude–phase contro...

A novel parallel calibration method was proposed and verified for phased arrays, by modulating phase shifters of multiple channels with multiple periods. After periodic phase modulation, the amplitude and phase mismatches can be calculated out through analyzing the generated harmonics in the composite signal. Compared to the existing method, two ma...

This letter presents a dual-polarized low-profile linear phased array antenna design achieving one-dimensional wide-angle scanning with high polarization isolation. The dual-polarized antenna is constructed based on a metasurface serving different purposes for two polarization cases to achieve high polarization isolation while providing a low profi...

A design approach of triband conformal monopolar antenna combining cavity mode and equivalent circuit (Ec) is proposed. First, based on mode analysis, two lower and closer resonant frequencies in the VHF-band are generated by introducing two slot rings and two circles of short vias to a circular parallel-plate structure. Second, its Ec is extracted...

A magnetic Yagi-Uda antenna applying higher order mode in millimeter-wave (mm-Wave) band with vertically polarized endfire radiation is proposed in this article. Surface wave mode analysis is applied to spot TE mode for magnetic Yagi-Uda antenna in contrast to TM mode for electric Yagi-Uda antenna. A modified structure evolved from conventional U-s...

The generalized principle of pattern multiplication (GPPM) and its application to wide-angle scanning array are investigated. It includes the generalized element factor (GEF), generalized array factor (GAF), and their beam match condition. The GEF model based on the phase mode currents in an aperture is given. A phase-mode antenna (PMA) with dual p...

p>The generalized principle of pattern multiplication (GPPM) and its application to wide-angle scanning array are investigated. It includes the generalized element factor (GEF), generalized array factor (GAF), and their beam match condition. The GEF model based on the phase mode currents in an aperture is given. A phase-mode antenna (PMA) with dual...

A novel low-profile phased antenna with dual-port and its two types of 1-D linear array to 2-D space wide-angle beam scanning are proposed. The antenna unit is composed of fishbone structure and rhombus parasitic patch, which is folded into n-shaped to low profile $0.08\lambda $ . By adjusting the phase difference ( $\Delta \varphi$ ) from 0° to...

Inspired by the development and evolution of nature, many natural laws can also be used to solve antenna design problems, such as artificial neural network technology, genetic algorithm, simulated annealing algorithm, particle swarm optimization algorithm, etc.

With the increasing requirements for wireless transmission rate and capacity, the development of broadband wireless communication has become very urgent.

A novel method to design patch antenna with computer-aid is presented in this chapter.

With the development of society, people's demand for high-speed wireless transmission is increasing, and wireless communication has achieved rapid development, but the spectrum resources are becoming increasingly scarce, especially the spectrum resources below 6 GHz are scarce, but the demand for higher transmission rate is also strong in today's s...

Generally speaking, the traditional antenna design mainly depends on the design experience of antenna engineers, especially the initial selection of antenna is often closely related to the knowledge, experience and habits of designers.

Radio-frequency identification (RFID) technology has become an indispensable technology in social life. In people’s daily life, traveling, dining, shopping and so on need RFID technology for identification, even payment.

Equidistant helical antenna is a kind of broadband circularly polarized antenna, but it radiates bidirectional pattern.

Optimization technology is a powerful tool for modern science and technology. This chapter mainly presents the knowledge about particle swarm algorithms and their improved algorithms.

This book investigates in detail the antenna optimization method with binary coding and their applications to antenna design. It introduces the binary coding principle and optimization method, the method of binary coding corresponding to geometry structure. In further, the designs by binary coding optimization method of following items are introduc...

Since the 1990s, SPP theory has been a hot topic. Untill 2014, the researches on SPP are mainly focused on the application of scatters in optical band, and which is mainly applied in the optoelectronic devices.

Spoof surface plasmon polaritons (SSPPs) structure has shown many novel electromagnetic performances, such as running wave in SSPPs structure with low loss, dispersive characteristics and strongly binding the electromagnetic wave in SSPPs structure, which are often used as transmission wave guide, diveiders and band filters in microwave RF devices

Due to the strong binding effect of artificial surface plasmons on electromagnetic field, the early artificial surface plasmons were mainly used in the design of transmission lines. Because the phase of artificial surface plasmons does not match the free space, artificial surface plasmons cannot directly radiate electromagnetic waves to the free sp...

Harrington has proved that the maximum directivity coefficient D of a source region is a function of the number of multipole modes N (Dmax = N2 + 2N) (Harrington in IRE Trans. Antennas Propag. 6:219, 1958; Harrington in J. Res. Natl. Bur. Stand. 64D:1, 1960). Theoretically, the larger the N is, the larger the directional coefficient D is, and the s...

Surface plasmon polaritons (SPPs) is a kind of surface electromagnetic wave mode formed by the interaction of metal surface charge and electromagnetic wave in the medium. This effect is mainly in the optical frequency band. Later, through the equivalent effect of this rough surface structure, it was introduced into millimeter wave, even microwave b...

Compared with the traditional antenna, the reconfigurable antenna is easy to achieve diversity, can greatly expand the working range and capacity of the antenna, and is small in size, easy to integrate with the control circuit (Liao et al. in Scientific Reports 5:9590, 2015; Kianinejad in IEEE Transactions on Microwave Theory and Techniques 63:1817...

Compact antenna with low profile is urgently needed in modern wireless communication system. Especially in moving vehicle communication or unmanned aerial vehicles (UAVs) communication, it doesn’t only need the directional antenna, tangent directional antenna and omnidirectional antenna, but also combine the low-profile conformal antenna into the s...

Low frequency communication system is still the main means of many special communication, in which RF and antenna account for 80% of the total system volume. On the one hand, people’s demand for large capacity and high rate of communication is increasing, which puts forward higher requirements for the performance of the antenna. When the size of th...

In this paper, a long-range underwater EM communication system is proposed based on ultra-compact ELF magneto-mechanical transmission antenna (UEMTA). The transmitter mainly includes waveform generator, variable frequency drive (VFD) and a three-phase induction motor. And the receiver consists of a 200-turn coil and signal analyzer. Based on the eq...

An m-shapedspoof surface plasmon polaritons (SSPPs) structure as well as its application into end fire antenna with vertical polarization, low profile and compact size are proposed to be conformal with vehicle shell. Beside the primary odd SSPPs mode in the center, extra even mode at the top horizontal arms and odd mode at the end of the arms are i...

A novel dual-port phase antenna is proposed to realize 2-D scanning. The antenna consists of two monopoles on both sides and a fishbone structure in the middle. By changing the phase difference ${\Delta \varphi }$ between two monopoles, energy is coupled to the proposed structure, exciting different degrees of superposition of even and odd modes....

This book investigates in detail some new spoof surface plasmon polaritons (SSPPs) structures and their applications to antenna. It introduces the working principle and radiation characteristics of directional antenna, omnidirectional antenna, reconfigurable antenna and phase-mode antenna based on SSPPs structure. Especially, the irregular SSPPs st...

A new broadband circularly-polarized antenna is presented for K-band application in this letter. The circularlypolarized radiation is realized by orthogonal-polarized slots based on a special structure of the L-shaped waveguide cavity. To verify the proposed idea, a single element and a 2×4-element array are designed, fabricated and measured. The s...

上海交通大学为研究生开设“计算电磁学”这门课已有三十多年历史，1994年至2008年由金荣洪主讲，2009年起由耿军平主讲。期间一直没有采用一本固定的教材，而是由主讲教师参照一些著作、参考文献以及科研中的案例形成教案，这样做的好处是可以根据学科的发展、生源的不同而及时调整，使得授课内容更贴近需求，也能及时介绍一些前沿性的研究成果。但不便之处也显而易见，学生不便于预习，教师备课工作量大，也不符合学校规范化管理的要求。经过这么多年的打磨，也具备了出一本教材的条件。因此借上海市高峰高原学科建设的东风，编写了这本以满足研究生学位课程“计算电磁学”为首要目的的教材。在此衷心感谢上海市“高峰高原”学科建设计划。 自1865年麦克斯韦发表的《电磁场的动力学理论》一文中揭示了电、磁现象与光的内在联系及统一性...

Abstract An approach to achieve directional low‐profile UWB antenna by omnidirectional source with a reflector, is proposed. The general theoretical model about the direction and the phase conditions between the upward and reflected field are developed. A bow‐tie dipole source antenna is investigated first. To modify its radiation defect, proper ph...

An extremely low-frequency (ELF) magnetomechanical antenna with the size of one-millionth wavelength based on a three-phase induction motor is reported, whose working frequency is no longer limited by the resonant wavelength. The rotating three-phase induction motor with nonmagnetic material shell is just equivalent to a rotating magnetic dipole wi...

A novel periodically rotated spoof surface plasmon polaritons (R-SSPPs) structure of s-shaped arms distributed along $ {z}$ -axis is proposed. The R-SSPPs structure can generate an endfire radiation lobe with rotating $E$ -field in odd mode, and omnidirectional radiation pattern with higher gain in quasi-even mode under different polarization p...

This paper proposes a new method of realizing multimode OAM beams with almost the same divergence angles. The theoretical relationship between the divergence angle of the OAM beam and its radiation source is presented, and the radiation source distributions for various mode OAM beams with the same divergence angle range are discussed. In order to v...

In this article, a new design approach for the wideband transformer with frequency-dependent complex loads is proposed, which is based on the least-square method and the generalized modified small reflection theory (MSRT) with proper electrical parameters. Compared with the wideband transformers based on other approaches such as the generalized MSR...

This brief presented a wideband bandstop filter (WBBSF) with compact size and five transmission zeros, which is based on a symmetrical three-layer ring structure comprising equivalently high-impedance phase-shift section, coupled lines, and short-stubs. The WBBSF based on multi-mode resonators can be directly synthesized from the desired rejection,...

The enhancement of optical characteristics at optical frequencies deviates with the choice of the arrangement of core-shell nanoparticles and their environment. Likewise, the arrangements of core-shell nanoparticles in the air over a substrate or in liquid solution makes them unstable in the atmosphere. This article suggests designing a configurati...

Reconfigurable antenna, due to their ability to obtain directive radiation pattern have been widely used in wireless communication system. There are various methods for beam-scanning antenna in the literature [1, 2, 3, 4].

In recent years, people have become more and more interested in the field of air-ground communications, such as communication between ground command stations and drones. Under normal circumstances, air-ground communication systems require antennas with wide coverage beams and circular polarization performance.

With the quickly developing of wireless transmission, the miniaturized terminal with multi-function working in multi-frequency bands has attracted more and more users. However, with the digital circuit being packaged into chip, the terminal miniaturization has gone to bottleneck period. The microwave transmission line and antenna is difficult to re...

Omnidirectional circularly polarized (CP) antenna (OCPA) is the key to realize 360° full coverage with being insensitive to the orientations of the incident waves in modern wireless communication, and it can also resist multipath interference and channel fading in the complex environment [1]. Especially, it is very useful in the radio channel in ci...

With the rapid growth of the demand for wireless transmission rate and capacity, wireless communication systems are developed quickly, and the antenna is not only to transmit or receive signal, but also increase the system performances. Such as polarization diversity (PDA) and spatial diversity (SDA) antennas, has been strong powerful to achieve la...

Microwave transmission line (TL) is a general term for various forms of transmission system used to transmit microwave information and energy. Its function is to guide electromagnetic wave to transmit in a certain direction, so it is also called guided wave system, and the guided electromagnetic wave is called guided wave. Generally, guided wave sy...

In wireless communication, there will be any polarization electromagnetic waves, including the intentionally loaded wave or depolarized wave by the environment, in which the antenna with dual circular polarization performances, left hand circular polarization (LHCP) or right hand circular polarization (RHCP), is very applicable and valuable in the...

Recently, the researchers pay more attention to antenna systems that radiate a conical beam with circular polarization (CP) character.

Omnidirectional antenna with high gain, low profile, vertical polarization, even CP polarization is very difficult to design, although it is from the dipole. In this book, a novel idea that the running wave in the coaxial wire is disturbed by the orthogonal slot array on the cylindrical metal shell is introduced, which radiates the CP wave in omni-...

We proposed an IR absorber hybrid nanoantenna comprise of two overlapping gold nanoparticles residing over larger a silica nanoparticle. A wet chemical route was employed to prepare the hybrid structure of nanoantenna. High-resolution transmission electron microscope was used to measure the size and morphology of the nanoantenna. The Hybrid nanoant...

Presents corrections to author information to the above mentioned article.

This article reports the finding of the plasmonic induced polarization rotation and propagation rotation when the plane EM wave radiates the adjacent active coated nano particle and large dielectric sphere at resonant frequency. The results investigate that the incident electromagnetic planewave excites the TM21 mode in the large size dielectric sp...

A novel millimeter-wave (mm-Wave) binary coding antenna with broadband, dual-polarization, and wide beamwidth is proposed, and its broad-angle scanning array is also studied. The element employs the stacked patches, where the optimal middle parasitic patch and top driven patch are introduced to broaden the bandwidth and beamwidth. The driven and pa...

Direction finding with time modulated array (TMA) has attracted considerable attention recently. In this communication, a multiharmonic analysis for direction finding based on TMA is proposed. The linear regression model of the two-element direction-finding system is established, and its noise covariance matrix is also analyzed. With the best linea...

This letter presents an optical transparent antenna array integrated with solar cell. Metal meshed structure is used in the transparent antenna array, which achieves a balance between radiation efficiency and optical transparency. The meshed patches have equidistant distribution in the array and are fed by coaxial probes. A meshed ground which has...

A low-profile wideband dual-polarized antenna with an improved HIS reflector is proposed. Dual-polarized radiation is excited by feeding a set of crossed dipoles. Low profile is achieved by utilizing an improved HIS reflector. Good impedance characteristics are realized by inserting small square cells among the primary hexagonal cells of the HIS. T...

Circularly-polarized planar antenna with a shaped pattern for airborne applications, is proposed in this letter. The proposed antenna consists of vertically-polarized formation and horizontally-polarized stubs to provide circularly-polarized configuration, which is loaded by a copper curl based top layer to control current distribution for beam sha...

A novel multi-user communication system based on the time modulated circular array (TMCA) has been proposed in this paper. Different modes of electromagnetic vortex waves are generated through TMCA by the transmitter and each mode carries different user's signal. To realize this mode-division multiplexing method, users' messages are modulated to di...