Backward wave reduction of a microstrip patch antenna using dual-band isolated soft surface structures

Abstract

In this paper, dual-band (Bluetooth and Wimax) surface wave suppression structure using novel soft surface structures is presented by a numerical study. The proposed new isolated soft surface structure does not share the ground plane of a patch. It consists of two loops with a corner edged via. By removing the ground plane edges of the patch and forming soft surfaces within the bare substrate, the front-to-back ratio of a patch antenna can be improved. When the 3 different isolated unit cells are used, the front-to-back ratio of a patch antenna is improved to about 7 dB through the use of the proposed new soft surface structure.

Isolation Improvement of a Microstrip Patch Array Antenna for WCDMA Indoor Repeater Applications

“…A new isolated soft surfaces structure that does not share the ground plane of a patch is also used for the reduction of the surface wave. The proposed new soft surface consists of a 2 International Journal of Antennas and Propagation number of metal mushroom-type structures that is located near the edges of substrate, and it is not connected with a ground plane [6,7]. A two-by-two microstrip patch array antenna for the indoor wideband code division multiple access (WCDMA) repeater applications is designed and tested experimentally.…”