Aperture Coupled Microstrip Antenna Array Research Articles

Broadband Dual-Polarized Aperture-Coupled Patch Antenna for 5G Applications

Abstract: This paper presents the design of a dual-polarized aperture-coupled microstrip antenna array for Sub-6GHz 5G communication systems. The antenna operates at 3.5 GHz and consists of 4×4 square patches. The proposed 4×4 array antenna feds by aperture-coupled feed line provide broadband bandwidth to operate in the N78 sub-6GHz 5G frequency band. The dualpolarized is presented, which gives two communications channels. The antenna consists of three layers and is designed on Rogers RO4003C substrate with a dielectric constant of 3.55 and substrate thickness of 0.8 mm. The final design of the antenna array with an overall size of 269 mm × 269 mm × 12.5 mm, and the results show that the 4×4 array has a 10dB bandwidth between 3.3-3.8 GHz and a maximum gain of 14.9 dB at 3.5 GHz, and the isolation between the two ports was 30 dB. The proposed antenna's gain, radiation efficiency, and bandwidth satisfy the requirements of 5G base station systems.

An aperture coupled microstrip antenna array for high power microwave application.

A three-layer aperture coupled microstrip antenna array (ACMA) is designed and fabricated for wideband high-power microwave (HPM) application, which has not been reported in the field of HPM. In this paper, the proposed antenna array overcomes the disadvantage of low power capacity of traditional microstrip antenna arrays. Moreover, based on the H-shaped aperture coupled structure, it enhances the relative bandwidth up to more than 50%. Compared with traditional HPM antennas, it has advantages of being low-profile (less than 0.2λ), wideband, lightweight, and easy to manufacture. The proposed antenna array consists of 60 elements; each element has four aperture coupled patch antennas fed by a four-way microstrip line power divider. In order to realize the modular design, the antenna array is divided into 10 identical modules; benefiting from this design, machining and assembling become easier. Additionally, cold tests and high-power tests are carried out, and the experimental results show that the ACMA achieves a relative bandwidth of 51.2% for voltage standing-wave ratio < 2 from 1.52 to 2.57 GHz. Consistent with simulation results, the measured gain is more than 28.8 dB in the whole bandwidth and it reaches a maximum of 32.1 dB. Finally, the high-power tests show that the power capacity of the proposed ACMA is greater than 140 MW, which proves the feasibility of the design in wideband HPM application.

A Novel Broadband and High-Isolation Dual-Polarized Microstrip Antenna Array Based on Quasi-Substrate Integrated Waveguide Technology

A $2 \times 2$ dual-polarized (DP) aperture-coupled microstrip antenna array with high isolation, broadband, and low cross polarization for Ku-band is proposed based on the quasi-substrate integrated waveguide (Q-SIW) technology. The proposed microstrip antenna array is excited by two orthogonal four-way corporate (parallel) feed networks, which not only has a multistage structure with broadband but also provides pairs of differential outputs. The Q-SIW structure, composed of several reflectors and substrate integrated metal pillars, is used to increase the bandwidth, improve the isolation, and reduce the influence of feed network. The measured and simulated results show that the DP array exhibits an impedance bandwidth of 26.37% for vertical port and 27.77% for horizontal port. The cross polarization level is better than −34 dB and −40 dB for two ports, and the isolation between the two ports is above 32 dB.

Circularly Polarized Antenna Array with Sequential Rotation for Nanosatellites

This paper presents the design and characterization of an aperture-coupled microstrip antenna array to be installed onto a nanosatellite. The proposed antenna array has been optimized to operate at 2.26 GHz (S-Band), which is the operating frequency of the downlink channel of the Brazilian System for Meteorological Data Acquisition. The electromagnetic analyses are done by using the HFSS electromagnetic simulator. For the design validation, prototypes of single elements and antenna array were manufactured. The comparison between simulations and measurements indicates good performance of the designed antennas.

Analysis of Aperture-Coupled Microstrip Antenna Array on LTCC by FDTD

Analysis of Aperture-Coupled Microstrip Antenna Array on LTCC by FDTD

Low-profile directive quasi-planar antennas based on millimetre wave Fabry–Perot cavities

A new configuration of directive and quasi-planar antennas is presented at millimetre wave frequencies. It comprises a plano-convex Fabry-Perot (FP) resonator excited by an arbitrary printed primary source. The total thickness of these low-profile antennas does not exceed 4 mm (0.8/spl times//spl lambda//sub 0/) at 60 GHz for directivities usually varying between 15.5 dB and 23.5 dB. By analogy with dielectric loaded open resonators, their theoretical radiation patterns are perfectly Gaussian. Experimental results obtained with single- or multi-layer planar feeds and with FP cavities of various radii of curvature and grid mirror reflectivities, confirm theoretical predictions. As examples, the patterns of two structures illuminated by the same aperture-coupled microstrip antenna array are compared in the 60 GHz band. They are rotationally symmetric and have low sidelobes (<-27 dB). No significant depolarisation effect is observed. The efficiency of these new radiating structures varies between 20% and 65%, depending on the quality factor of the FP cavities.

A retrodirective microstrip antenna array

A Van Atta retrodirective reflector was designed and developed, using an aperture-coupled microstrip antenna array. This reflector possesses the advantage of reflecting high fields to the source point over a wide range of incidence angles and, owing to the low cost and conformability of the structure, is suitable for applications in intelligent vehicle highway systems (IVHS). An approximate theory associated with the reradiation and scattering principles of the reflector is presented for the purpose of understanding and designing the reflector. The utility of the retrodirective reflector was demonstrated by comparison with a plate reflector and a microstrip antenna array without a feed structure. Finally, a reflector with switches in the middle of the microstrip feed lines was investigated for possible applications in communications and remote identification.

Design of aperture coupled microstrip antenna array fed by dielectric image line

A novel design for a linear array of microstrip antennas, aperture coupled to a dielectric image line has been developed. The design is based on a simplified theory to determine the impedances of the antennas at their apertures, and in turn, the coupling to each antenna from the image line. The theory developed is verified using an eight-element linear array and the experiment results are very good.