Abstract
Application of phase encoding to a received RF signal, and retransmission of the signal phase encoded at the same frequency using polarisation diversity, is used to design a simple two-port microstrip patch antenna which will permit single-frequency polarisation-diversity operation. The antenna is characterised in terms of its far-field radiation pattern and its two-port scattering parameters. An injection-locked oscillator is coupled to an adapted passive quasicirculator to perform the phase-encoding function. Here control of the direct tuning voltage to the injection-locked oscillator effects the degree of phase change obtained. The operation of this circuit is discussed and its inclusion with the dual-port patch antenna to form a phase-encoding transponder is described.
| Original language | English |
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| Pages (from-to) | 201-204 |
| Number of pages | 4 |
| Journal | IEE Proceedings - Microwaves, Antennas and Propagation |
| Volume | 144 |
| Issue number | 3 |
| Publication status | Published - Jun 1997 |