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Wideband linear and circularly polarized patch antenna using a printed stepped T-feed

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3 Author(s)
Rao, P.H. ; Sch. of Electr. & Electron. Eng., Queen''s Univ., Belfast, UK ; Fusco, V.F. ; Cahill, R.

The inherent disadvantage of the narrow bandwidth of microstrip antennas is overcome by a wideband feed mechanism. A square patch excited by a stepped T-feed probe achieved an octave bandwidth (0.98 to 2.1 GHz) with a voltage standing wave ratio of <2. A similar return loss over an octave bandwidth (1.05 to 2.4 GHz) was measured when two orthogonal stepped T-feed probes fed by a log-periodic balun were used to generate circular polarization (CP). For CP, pattern symmetry is shown to occur over 50% of the band, and the CP 3 dB axial-ratio bandwidth is of the order of 30%

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:50 ,  Issue: 3 )

Date of Publication:

Mar 2002

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