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Journal ArticleDOI

A parasitic surface based wide beam width patch antenna

19 Nov 2021-AIP Advances (AIP Publishing LLCAIP Publishing)-Vol. 11, Iss: 11, pp 115320
TL;DR: In this article, a parasitic surface (PS) based wide beam width patch antenna operating at 5 GHz is presented, which is composed of a parasitic ring and six parasitic patches, and it is shown that the PS has little effect on the impedance bandwidth of the patch antenna but can increase the HPBWs by 66.7° (from 85.1° to 151.8°) in the E-plane.
Abstract: A parasitic surface (PS) based wide beam width patch antenna operating at 5 GHz is presented. The half-power beam widths (HPBWs) of the patch antenna are improved by the PS, which is composed of a parasitic ring and six parasitic patches. The parasitic ring is used to increase the HPBW in the E-plane, while the six parasitic patches are used to increase the HPBW in the H-plane. Simulation results show that the PS has little effect on the impedance bandwidth of the patch antenna but can increase the HPBW by 66.7° (from 85.1° to 151.8°) in the E-plane and 88.7° (from 78.9° to 167.6°) in the H-plane at 5 GHz. At the same time, the PS decreases the boresight gain of the patch antenna from 5.42 to 3.06 dBi. Measurement results agree well with the simulation.
References
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Journal ArticleDOI
TL;DR: It is shown that the mutual-coupling reduction methods inspired by MTM and MTS concepts can provide a higher level of isolation between neighbouring radiating elements using easily realizable and cost-effective decoupling configurations that have negligible consequence on the array’s characteristics such as bandwidth, gain and radiation efficiency, and physical footprint.
Abstract: Nowadays synthetic aperture radar (SAR) and multiple-input-multiple-output (MIMO) antenna systems with the capability to radiate waves in more than one pattern and polarization are playing a key role in modern telecommunication and radar systems. This is possible with the use of antenna arrays as they offer advantages of high gain and beamforming capability, which can be utilized for controlling radiation pattern for electromagnetic (EM) interference immunity in wireless systems. However, with the growing demand for compact array antennas, the physical footprint of the arrays needs to be smaller and the consequent of this is severe degradation in the performance of the array resulting from strong mutual-coupling and crosstalk effects between adjacent radiating elements. This review presents a detailed systematic and theoretical study of various mutual-coupling suppression (decoupling) techniques with a strong focus on metamaterial (MTM) and metasurface (MTS) approaches. While the performance of systems employing antenna arrays can be enhanced by calibrating out the interferences digitally, however it is more efficient to apply decoupling techniques at the antenna itself. Previously various simple and cost-effective approaches have been demonstrated to effectively suppress unwanted mutual-coupling in arrays. Such techniques include the use of defected ground structure (DGS), parasitic or slot element, dielectric resonator antenna (DRA), complementary split-ring resonators (CSRR), decoupling networks, P.I.N or varactor diodes, electromagnetic bandgap (EBG) structures, etc. In this review, it is shown that the mutual-coupling reduction methods inspired By MTM and MTS concepts can provide a higher level of isolation between neighbouring radiating elements using easily realizable and cost-effective decoupling configurations that have negligible consequence on the array’s characteristics such as bandwidth, gain and radiation efficiency, and physical footprint.

226 citations

Journal ArticleDOI
TL;DR: In this article, a two-dimensional broadband low-loss Luneburg lens has been designed based on the complementary metamaterials, and the experimental sample has been fabricated and tested in a near-field microwave scanning apparatus, where the experiment and simulation results agree very well.
Abstract: A two-dimensional broadband low-loss Luneburg lens has been designed based on the complementary metamaterials. The complementary I-shaped unit has been chosen as the basic cell due to its high resonant frequency, whose effective constitutive parameters are nearly constants at low frequencies. Numerical simulations are performed to determine the relationship between the unit geometry and the refraction index. The experimental sample has been fabricated and tested in a two-dimensional near-field microwave scanning apparatus, where the experiment and simulation results agree very well. Good focusing ability has been shown from the measured field distributions of the designed planar Luneburg lens.

121 citations

Journal ArticleDOI
TL;DR: In this article, a wide-beam microstrip antenna with metal walls is proposed to improve the wide-angle scanning performance of the phased array antennas, and the beamwidth of the antenna is broadened by the horizontal current on the radiating patch and the vertical currents on the metal walls.
Abstract: In order to improve the wide-angle scanning performance of the phased array antennas, a wide-beam microstrip antenna with metal walls is proposed in this letter. The beamwidth of the antenna is broadened by the horizontal current on the radiating patch and the vertical current on the metal walls. The half-power beamwidth of the E- and H-planes is 221° and 168° at 4.0 GHz. Furthermore, the wide-beam antenna element is employed in a nine-element E-plane linear array antenna. The main beam of the E-plane scanning linear array antenna can scan from −70° to +70° in the frequency band from 3.7 to 4.3 GHz with a gain fluctuation less than 2.7 dB and variation in maximum sidelobe level less than −5.8 dB. The E-plane scanning linear array antenna with nine elements is fabricated and tested. The measured results achieve a good agreement with the simulated results.

78 citations

Journal ArticleDOI
TL;DR: In this article, a single-feed circularly-polarized (CP) wide beam microstrip antenna is proposed for CNSS application, which is designed with a double-layer structure, comprising a circular patch with two rectangular stubs along the diameter direction and a parasitic ring right above it.
Abstract: A compact single-feed circularly-polarized (CP) wide beam microstrip antenna is proposed for CNSS application. The antenna is designed with a double-layer structure, comprising a circular patch with two rectangular stubs along the diameter direction and a parasitic ring right above it. The resonance frequency and the CP characteristics are mainly controlled by the circular patch and the rectangular stubs, respectively. The vertical HPBW (half power beam width) could be widened by the parasitic ring. Experimental results show that the measured vertical HPBW is approximately 140° and the measured out-of-roundness for the horizontal radiation pattern is only 1.1 dB. Besides, it could maintain good low-profile characteristics.

68 citations

Journal ArticleDOI
TL;DR: In this paper, a rectangular microstrip patch on a composite substrate is theoretically and experimentally investigated, and the proposed configuration shows as much as 75% increment in beam width in its H-plane and nearly 10% in E-plane, indicating peak gain of the order of 8 dBi.
Abstract: A rectangular microstrip patch on a composite substrate is theoretically and experimentally investigated. Considerably wide radiation beamwidth along with high gain is experimentally demonstrated. Compared to a conventional microstrip patch, the proposed configuration shows as much as 75% increment in beam width in its H-plane and nearly 10% in E-plane, indicating the peak gain of the order of 8 dBi.

63 citations