Super Realized Gain Antenna Array

TL;DR

This paper presents the design and fabrication of a superdirective antenna array operating at 3.5 GHz, achieving high gain and efficiency through optimized element spacing and phase adjustments without additional matching components.

Contribution

The study introduces a superdirective antenna array with optimized parameters that achieves high directivity and efficiency without extra impedance matching networks.

Findings

Maximum realized gain of 6.3 dBi achieved

Efficiency close to 99.3% computed

High directivity with simplified design

Abstract

In this study, we investigate and fabricate a superdirective antenna array composed of strip dipole elements operating at a frequency of 3.5 GHz. The spacing, dimensions, and phase difference of the elements are optimized to achieve a super realized gain antenna with a theoretical efficiency of 98.8% and computed efficiency of 99.3%. By employing an element spacing of 0.2$\lambda$, the end-fire antenna array demonstrates a maximum theoretical realized gain of 6.4 dBi, and a maximum computed realized gain of 6.3 dBi. Significantly, our proposed superdirective antenna array distinguishes itself from existing approaches by achieving high directivity, high radiation efficiency, and impedance matching to 50 $\Omega$ solely through careful adjustments in the strip dimensions and the inter-element phase. This eliminates the need for additional impedance matching networks, amplifiers, or attenuators.