Dual-band dual-polarized sub-6 GHz phased array antenna with suppressed higher order modes

Debaprasad Barad; Jogesh Chandra Dash; Debdeep Sarkar; P Srinivasulu

doi:10.1038/s41598-024-56218-8

Dual-band dual-polarized sub-6 GHz phased array antenna with suppressed higher order modes

Sci Rep. 2024 Mar 13;14(1):6139. doi: 10.1038/s41598-024-56218-8.

Authors

Debaprasad Barad¹, Jogesh Chandra Dash², Debdeep Sarkar³, P Srinivasulu⁴

Affiliations

¹ Electrical Communication Engineering, Indian Institute of Science(IISc), Bangalore, Karnataka, 560021, India. deba7482@gmail.com.
² Department of Electronics and Communication Engineering, NIT, Rourkela, Odisha, 769008, India.
³ Electrical Communication Engineering, Indian Institute of Science(IISc), Bangalore, Karnataka, 560021, India.
⁴ RF and Radar Group, Astra Microwave Private Limited, Hyderabad, Telangana, 501218, India.

Abstract

This manuscript proposes a dual-band dual-polarized 64-element phased array antenna (PAA) with suppressed higher order modes (HoMs). Each array element is a microstrip patch structure with complementary split ring resonator (CSRR) loading, allowing for simultaneous dual-band and dual-polarization performance at 3.45 GHz and 3.87 GHz. The proposed PAA exhibits impedance matching of $\leq - 20$ dB at 3.45 GHz and 3.87 GHz while limiting the mutual coupling below $- 19$ dB between the adjacent elements at both the operating bands. The proposed design includes a plated through hole placed near the CSRR loading to suppress any higher-order modes (HOMs). Two antenna prototypes, without and with HOMs suppression techniques are fabricated and measured. In addition, we demonstrate the beam steering of the proposed PAA up to $\pm 60^{0}$ using an off-the-shelf 6-bit phase shifter module. The proposed 64 -element array achieves a gain of 23 dBi, and shows a minimal steering loss of $≃ 3$ dB over the steering angle.