Dual-band dual-polarized sub-6 GHz phased array antenna with suppressed higher order modes
Debaprasad Barad, Jogesh Chandra Dash, Debdeep Sarkar, Avireni Srinivasulu
Abstract
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 $$\le - 20$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≤</mml:mo> <mml:mo>-</mml:mo> <mml:mn>20</mml:mn> </mml:mrow> </mml:math> dB at 3.45 GHz and 3.87 GHz while limiting the mutual coupling below $$- 19$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>19</mml:mn> </mml:mrow> </mml:math> 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 $$\pm 60^0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>±</mml:mo> <mml:msup> <mml:mn>60</mml:mn> <mml:mn>0</mml:mn> </mml:msup> </mml:mrow> </mml:math> 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 $$\simeq 3$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>≃</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:math> dB over the steering angle.