An Approach for Calculating the Limiting Bandwidth-Reflection Coefficient Product for Microstrip Patch Antennas.
Ghorbani, A. McEwan, Neil J. Zhou, Dawei
Ghorbani, A.
McEwan, Neil J.
Zhou, Dawei
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2006
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Abstract
The bandwidth of a microstrip patch antenna is expressed in terms of minimum achievable reflection coefficient using an equivalent circuit and the Bode-Fano theory. The bandwidth-reflection coefficient product is found to be proportional to antenna height and largely independent of feed probe position, for small bandwidths. The product can be computed directly from a numerical evaluation of the first-order Bode-Fano integral. Curves are presented showing how the product becomes limited by the feed probe inductance at very large bandwidths. It is concluded that this effect is unlikely to be a limit on the potential bandwidth of a practical patch antenna. If as a minimal correction the feed inductance is tuned out, the realized bandwidth with low order matching or optimal over-coupling shows the expected relationship to the theoretical limit.
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Ghorbani A, Abd-Alhameed, R, McEwan NJ et al (2006). An Approach for Calculating the Limiting Bandwidth-Reflection Coefficient Product for Microstrip Patch Antennas. IEEE Transactions on Antennas and Propagation. 54(4): 1328-1331.
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