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Abstract
In this work, a transmitting two port aperture coupled microstrip antenna with variable polarisation is presented using variable phase shifters based on Injection Locked Oscillators (ILO). The polarisation of the antenna can be tuned in a continuous range, enabling two orthogonal linear polarisations, and both right hand and left hand circular polarisation. The signals applied to the two antenna ports are generated by the ILO circuits and can be phase shifted in a continuous theoretical range of 180 degrees. The phase-shift versus the DC varactor control signal of the individual ILO circuits and the axial ratio of the ILO based polarisation agile antenna is studied through harmonic balance and envelope transient simulations in combination with electromagnetic simulations. A polarisation agile antenna at 10.735 GHz has been manufactured obtaining a good agreement between the simulated and experimentally obtained behaviour.