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Multioctave bandwidth log-periodic microstrip antenna array

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1 Author(s)
Hall, P.S. ; Royal Military College of Science, School of Electrical Engineering and Science, Swindon, UK

The application of the log-periodic technique to the series-fed electromagnetically coupled overlaidpatch array allows antennas with flat conformal characteristics and wide bandwidths to be obtained. A k-¿¿ analysis of this and other microstrip array types indicate that the microstrip patch is not an optimum element for log-periodic arrays and that direct connection will result in arrays having a limited bandwidth. The addition of series capacitance to the patch equivalent circuit, implemented by electromagnetic coupling, allows an optimum to be approached. Log-periodic overlaid patch array design and measured results for an array with a 4:1 bandwidth are presented. These, together with a transmission-line analysis, indicate the array-design trade offs available and that the ultimate bandwidth is limited primarily by changes in the input return loss and radiation pattern due to the use of uniform thickness substrates.

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings H  (Volume:133 ,  Issue: 2 )