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2026-05-03 Latest Published

A Compact Shared-Aperture MIMO Antenna System for Microwave and Millimeter-Wave V2X Communications
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By Xiao-Mei Ni Xin-Hao Ding Zhen Tan Xin Wang Ming-Zhu Du

Progress In Electromagnetics Research M, Vol. 138, 22-32, 2026

doi:10.2528/PIERM26031804 | Google Scholar

Abstract

To meet the stringent space constraints and diverse connectivity requirements of modern intelligent connected vehicles, a compact MIMO antenna system designed for microwave and millimeter-wave (mm-wave) vehicle-to-everything (V2X) communications is presented. The proposed antenna features a compact footprint adaptable for integration into space-limited automotive modules, such as shark fin antenna housings. By employing a structure reuse technique, the system integrates a four-element microwave MIMO array and two orthogonal mm-wave phased arrays within a size of 30 mm × 30 mm × 2 mm. In the microwave band, a parasitic patch is introduced to achieve dual-mode resonance, ensuring a wide bandwidth for reliable control signaling. Two orthogonal rows of metallized cavities serve a dual purpose: acting as decoupling structures for the microwave MIMO system and functioning as mm-wave arrays to enable two-dimensional beam scanning. This capability is crucial for overcoming blockage effects in dynamic vehicular environments. Experimental results demonstrate that the proposed antenna achieves wide coverage in the microwave band (4.62-5.11 GHz) and high-gain beam scanning (±40°) in the mm-wave band (25.8-30.4 GHz). The measured isolation exceeds 17 dB with an envelope correlation coefficient below 0.11, validating its suitability for next-generation vehicle terminals.

2026-05-03

PIER M

Vol. 138, 22-32, 2026

doi:10.2528/PIERM26031804

download: 55

A Compact Shared-Aperture MIMO Antenna System for Microwave and Millimeter-Wave V2X Communications

Xiao-Mei Ni, Xin-Hao Ding, Zhen Tan, Xin Wang and Ming-Zhu Du

2026-04-27

PIER M

Vol. 138, 10-21, 2026

doi:10.2528/PIERM26010103

download: 59

Performance Evaluation of a Dual-Band h-Shaped Metamaterial Perfect Absorber with Polarization-Insensitive Characteristics for Satellite Communication Applications

Vanam Chinna Narasimhulu, Govardhani Immadi and Madhavareddy Venkata Narayana

A compact, double split-ring H-shaped resonator-based polarization-independent dual-band metamaterial microwave absorber (MMA) with an outstanding absorption efficiency was designed and analyzed for satellite communication applications. The H-shaped resonator-based unit cell was printed on an FR4 material using copper as the conducting material. Copper material was chosen for the radiating patch and the ground plane. A detailed parametric analysis was performed by tuning the geometrical parameters of the H-shaped MMA to achieve dual absorption bands with broad bandwidth and high absorptivity. The recommended H-shaped absorber exhibits dual absorption bandwidths of 710 MHz and 1630 MHz with FBW of 22.95% and 19.35%. Furthermore, it maintains an absorptivity of greater than 90% across the entire spectrum of dual operating bands with almost perfect absorption of 99.99% at the resonant frequencies (3.17 GHz, 7.78 GHz) of each band. The MMA maintains an area of 0.09λ × 0.09λ. A simulated absorber model was fabricated, and the results have been tested using an Anritsu Combinational Analyzer (MS2037C) for experimental validation. The simulated and tested outcomes of the developed prototype are in strong alignment, rendering the absorber suitable for S-band and LEO and geostationary satellite uplinks/downlinks, with specific bands often at 7.145-7.235 GHz (uplink) and 8.4-8.5 GHz (downlink).

Performance Evaluation of a Dual-band H-shaped Metamaterial Perfect Absorber with Polarization-insensitive Characteristics for Satellite Communication Applications

2026-04-14

PIER M

Vol. 138, 1-9, 2026

doi:10.2528/PIERM26021201

download: 116

A Dual-Band Shared-Aperture Antenna Employing a Meshed Patch and AMC-Backed Fabry-Perot Cavity

Chaoyuan Guo, Zhihan Liu and Yufeng Liu

A low-profile, dual-band, shared-aperture antenna with a large frequency ratio is presented, based on a meshed patch and an AMC-backed Fabry-Perot (F-P) cavity. By taking advantage of the weak frequency sensitivity of grid slotting in meshed patches, the upper meshed patch is utilized as both the parasitic patch for the low-frequency antenna and the partially reflective surface (PRS) for the high-frequency F-P cavity, thereby simplifying the overall structure. Meanwhile, the AMC ground is employed to control the reflection phase and reduce the cavity height to λ/4, which enables both antennas to share the same aperture within an 8-mm profile. A prototype is fabricated and tested at 1.6 GHz and 15.14-15.46 GHz. Measured results demonstrate a frequency ratio of 1:9.6, a peak gain of 6.2 dBi at 1.6 GHz, a peak gain of 11.8 dBi in the high-frequency band, and a port isolation better than 17 dB. The proposed antenna features compact size, low profile, and efficient structural reuse, making it attractive for integrated multi-band communication systems.