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Broadband suspended plate antenna with probe-fed strip

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2 Author(s)
Chen, Z.N. ; Centre for Wireless Commun., Nat. Univ. of Singapore, Singapore ; Chia, M.Y.W.

The paper demonstrates a new means of achieving a broad impedance bandwidth with a simple mechanical structure and low cross-polarisation levels for a suspended plate antenna with a co-axial probe-fed strip. The feeding-strip co-planar with the plate has a capacitive coupling with the plate, which effectively wipes out large inductance due to the long probe and gives rise to a broad impedance bandwidth. The narrow feeding structure avoids unwanted change of the current distribution at the plate surface and therefore, improves the polarisation performance to some degree. Furthermore, the co-planar feeding configuration simplifies the mechanical structure of the antenna. As examples, two rectangular suspended probe-fed strip single-layer plate antennas were made and examined experimentally. Measurements demonstrate good performances with broad impedance bandwidths up to 36%, stable radiation patterns with cross-polarisation levels of less than -17 dB, and gains of 4-5 dBi

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:148 ,  Issue: 1 )