Passive phase conjugating array using FR4

Abstract

This paper presents the development and construction of a low-cost passive phase conjugating array (PCA) antenna aiming the mitigation of multipath phenomena at 6 GHz. The implementation of the proposed array was performed on woven fiber glass substrate using both discrete and integrated circuits. Measurement results, obtained inside an anechoic chamber, from a 16-element PCA antenna under multipath conditions are used to validate its feasibility for vehicular applications where beam steering is required. Tests performed in the chamber yield to an average gain of 9 dB across a 120 0 angular range and peak gains of 32 dB. The relative good performance of the proposed PCA topology clearly demonstrates its benefit in mitigating multipath fading and, consequently, fade margin reduction.

Retrodirective Antenna for Inter-Satellite Data Transmission

“…As for the heterodyne technology based on the mixers, there are mainly two kinds of techniques to implement the phase conjugation, one is using its intermediate frequency (IF), another is using its local oscillator (LO) with its frequency as twice of the RF. In the heterodyne technique using an IF [22], normally two mixers are used for each channel to produce the phase conjugating signal. One of the mixers is used to mix a RF signal down to an IF with a relatively low frequency, and the other mixes the IF with a different LO signal for reradiation.…”