In this article, a novel slot-array defected ground structure (DGS) for decoupling microstrip antenna array is proposed. The DGS etched surrounding each element on the plane and parallel to radiating edges of element. mechanism elucidated via an equivalent circuit model coupled current field analysis, which reveals has spatial band-stop characteristic changes direction partially current, respectively. Both characteristics contribute mutual coupling reduction. Three practical design examples...

In the practical radar with multiple antennas, antenna imperfections degrade system performance. this paper, problem of estimating direction arrival (DOA) in multiple-input and multiple-output (MIMO) unknown mutual coupling effect between antennas is investigated. To exploit target sparsity spatial domain, compressed sensing (CS)-based methods have been proposed by discretizing detection area formulating dictionary matrix, so an \emph{off-grid} gap caused discretization processes. different...

A novel compact low-profile circularly polarized Fabry-Perot resonator (CP-FPR) antenna fed by a linearly microstrip patch tilting 45 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">°</sup> with respect to the axes is presented. The FP cavity consists of partially reflective surface formed cross-slot frequency selective (FSS) and nonstandard artificial magnetic conductor (AMC) acting as ground plane. Its profile reduced quarter wavelength. For...

The problem of direction arrival (DOA) estimation has been studied for decades as an essential technology in enabling radar, wireless communications, and array signal processing related applications. In this paper, the DOA scenario with gain-phase errors is considered, a sparse model formulated by exploiting sparsity spatial domain. By proposing new atomic norm, named GP-ANM, optimization method via deriving dual norm GP-ANM. Then, corresponding semidefinite program (SDP) given to estimate...

A broadband dual-polarized notched-band antenna is proposed for the application of 2/3/4/5G base stations. The radiator composed a pair crossed printed dipoles and fed by both baluns. Based on with tooth-shaped slot line in baluns, dumbbell-shaped parasitic element above to generate notch band from 2.9 3.1 GHz improve impedance matching operating (1.71-2.69 3.4-3.6 GHz). To verify principle, was fabricated measured. experimental results confirm that it achieves bandwidth covering 1.71-3.6...

As a new type of super-low-frequency (SLF, 30–300 Hz) magnetic antenna, the permanent mechanical antenna (PMMA) has great potential for applications in underwater communication, underground and earthquake prediction. PMMAs use large-volume magnets to enhance signal, posing significant challenge power consumption drive structure. We optimize terms magnetization structure, material, form factor determine optimal magnet establish an analytical model torque array elements radiated field form....

The computational complexity of the conventional adaptive beamformer is relatively large, and performance degrades significantly due to both model mismatch errors unwanted signals in received data. In this paper, an efficient signal removal Gauss-Legendre quadra-ture (URGLQ)-based covariance matrix reconstruction method proposed. Different from prior recon-struction methods, a projection constructed remove data, which improves accuracy matrix. Considering that most algorithms are large...

Abstract With the rapid development of frequency-selective surface (FSS) and rasorber (FSR) based on electromagnetic periodic structures, parallel-plate waveguide (PPW) measurement structure has become increasingly important as a simple, low cost, and-broadband test device. However, it usually needs to be customized according different sizes device under (DUT), so how carry out design PPW band other requirements becomes quite in practical applications. In this paper, study with general...

Antennas operating at the extremely-low frequency (ELF, 30-300Hz) are desirable for undersea and underground wireless communications as well engineering detection thanks to their strong penetration interference resistance. However, efficiency portability of communication is greatly limited by size conventional antenna large current required. This has stimulated need a new approach low design. Here, we propose rotating permanent magnet mechanical (RPMMA) based on volume magnet. Based...

Due to the limited ability of a single unmanned aerial vehicle (UAV), group vehicles (UAVs) have attracted more attention in communication and radar fields. The use an integrated sensing (ISAC) system can make modules share module’s resources, coupled with efficient resource allocation methods. It effectively solve problem inadequate UAV resources low utilization rate resources. In this paper, is addressed for UAVs achieve trade-off between detection performance, where ISAC equipped UAVs....

In millimeter wave (mmWave) communications, the feature of relatively large signal absorption and directional transmission render new challenges for wireless communications processing. To further improve performance mmWave a novel radar-aided communication (RAMC) approach is proposed, which can be used in vehicular communications. There are two parts proposed RAMC system, including radar subsystem subsystem. subsystem, bistatic co-prime multi-input multi-output (MIMO) arrays considered. With...

Mechanical antennas (MAs) directly use the mechanical motion of electric or magnetic charges to excite electromagnetic waves. The radiation distance rotating dipole type is related volume source, so source too large for long-distance communication. To solve above problem, we first establish field model and differential equations antenna array. Then, design prototype array with operating frequency 75-125Hz. Finally, experimentally established intensity relationship between a single permanent...

In this paper, a miniaturized frequency-selective rasorber (FSR) with an ultra-wide transmission band (| S21 | <1 dB) is presented. The FSR made up of lossless multi-layer cascaded surface (FSS) 2.5-D lossy layer above, separated by air gap. Modified metallic Jerusalem crosses loaded lumped resistors serve as the unit cell layer. An equivalent parallel LC circuit high inductance and extremely low parasitic capacitance introduced zigzag strips vias, which broaden significantly. model (ECM)...

The unknown mutual coupling effect between antennas significantly degrades the target localization performance in bistatic multiple-input multiple-output (MIMO) radar. In this paper, joint estimation problem for direction of departure (DOD) and arrival (DOA) is addressed. By exploiting sparsity spatial domain formulating a dictionary matrix with discretizing DOD/DOA into grids, compressed sensing (CS)-based system model given. However, practical MIMO radar systems, cannot be precisely on...

The circularly polarized Fabry-Perot resonator (FPR) antenna is presented, which consists of a primary radiator backed with metal ground plate and partially reflective surface covered composed appropriate frequency selective (FSS) structure ring elements. For the proposed antenna, an L-probe utilized to feed patch orthogonally, Wilkinson power combiner connected feeds generate circular polarization, act as antenna. possessed 10-dB return loss bandwidth 15.5%, has 3-dB axial ratio 13.2%. A...

The performance of a direction-finding system is significantly degraded by the imperfection an array. In this paper, direction-of-arrival (DOA) estimation problem investigated in uniform linear array (ULA) with unknown mutual coupling (MC) effect. model MC effect formulated. Then, exploiting signal sparsity spatial domain, compressed-sensing (CS)-based proposed coefficients, and DOA converted into that sparse reconstruction. To solve reconstruction efficiently, novel method, named...

To retrieve complex-valued effective permittivity and permeability of electromagnetic metamaterials (EMMs) based on resonant effect from scattering parameters using a complex logarithmic function is not inevitable. When values are expressed in terms magnitude phase, an infinite number permissible phase angles due to the multi-valued property functions. Special attention needs be paid ensure continuity lossy as frequency sweeps. In this paper, automated correction (APC) algorithm proposed...

Two-dimensional antennas provide additional variables that can be used to control and shape the pattern, widely in engineering applications include tracking radar, communications, direction finding many others. However, reduced mutual coupling becomes more complex due mode strength of field between sani adjacent elements are different. In this paper, a low-profile decoupling slot-strip array (DSSA) for 2 × microstrip antenna is proposed. The DSSA consists slot etched on ground plane strip...

The existing positioning methods for the automatic guided vehicle (AGV) in port can not achieve high location precision, Therefore, a novel multiple input output (MIMO) antenna radar scheme is proposed this paper. problem AGV considered, and joint estimation direction of departure (DoD) arrival (DoA) addressed multiple-input multiple-output system. With detect transponder estimate DoA/DoD, relative between be obtained. corresponding Cramér–Rao lower bounds (CRLBs) target parameters are also...

A super-compact metamaterial absorber (SMA) unit cell in L band (1–2 GHz) is proposed, which composed of a pair electric ring resonator (ERR) and its complementary ERR (CERR) with high dielectric substrate sandwiched between. The CERR has cross sectional area where approximately the etched copper foil now retained, remaining region etched. In contract quarter-wavelength (λ/4) thickness required for conventional absorbers, largest in-plane dimension SMA are only λ/33 λ/250, respectively,...