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Cavity induced polarisation switching in a slot-loop active antenna

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4 Author(s)
Chen, Q. ; Dept. of Electr. & Electron. Eng., Queen's Univ., Belfast, UK ; Zheng, M. ; Fusco, V.F. ; Hall, P.S.

The new features of a cavity backed active slot-loop antenna are discussed in this paper. By using a high Q cavity, 35 dBc phase noise level reduction at 200 kHz from the carrier has been achieved. Once in resonance, the established TE/sub 110/ cavity fields rotate the principle E-plane of the slot-loop antenna through 90/spl deg/. This results in an exchange of E- and H-plane locations in the radiation pattern together with reduced cross-polarisation levels. Thus the presence of the cavity tuned into and out of resonance allows the antenna to have its polarisation properties orthogonally switched.

Published in:

Microwave Symposium Digest, 1998 IEEE MTT-S International  (Volume:3 )

Date of Conference:

7-12 June 1998

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