A Single-Layer Reflect-Transmit-Array Antenna With Polarization-Dependent Operation

Abstract

In this paper, a novel low-profile, dual-polarized reflect-transmit-array antenna is proposed to independently control the forward and backward beams. A single-layer polarization-dependent element is designed with 0.1 λ0-thickness at 10 GHz, which comprises only two layers of metal patches printed on a dielectric substrate and two metallized vias. Through changing the polarization direction of the incident wave, the operating mode of the proposed array can be easily shifted among reflection mode, reflectiontransmission mode, as well as transmission mode. To verify the design concept, a circular reflect-transmitarray (D = 250 mm) is designed, fabricated, and measured. The measured results indicate a 1 dB bandwidth of 17% (9.8-11.5 GHz) in reflection mode and a measured peak gain of 24.2 dB at 10.5 GHz. Moreover, a 1 dB bandwidth of 6% (9.7-10.3 GHz) can be achieved in transmission mode, and the measured peak gain is 24.6 dB at 10 GHz. The results prove that the proposed design is promising for bidirectional wireless communication applications.

W-Band Broadband Circularly Polarized Reflectarray Antenna

“…where k is the wavenumber, Ri is the distance between the phase center and the ith element, 𝑟 ⃗ is the position vector of the ith element, 𝑟̂ is the unit vector in the main beam direction, and 0 φ is the relative phase [21]. To design the aperture phase distribution, firstly, we should choose the proper focal distance F and aperture size D. The focus-to-diameter ratio (F/D) is a key factor to obtain a higher aperture efficiency of the RA.…”

“…where k is the wavenumber, R i is the distance between the phase center and the ith element, → r i is the position vector of the ith element, r0 is the unit vector in the main beam direction, and φ 0 is the relative phase [21].…”

3D Metal-Only Phoenix Cell and its Application for Transmit-Reflect-Array

“…For example, [11] proposes a TRA based on a multilayer amplitude-phase-modulated stack-up and employing sparse-array concepts. Similar antennas that combine TA and RA are proposed in [12][13][14][15][16][17]. For these antennas, however, the bidirectional beams are not produced simultaneously, and their operation modes depend on polarization and frequency.…”

“…For these antennas, however, the bidirectional beams are not produced simultaneously, and their operation modes depend on polarization and frequency. Moreover, all the aforementioned examples use dielectric materials [11][12][13][14][15][16][17]. A design of metal-only TRA (MOTRA) is proposed in [18] that consists of Babinet-inverted defected square slot cells etched on a single-layer thin metallic sheet.…”