This paper presents the isolation improvement techniques of a microstrip patch array antenna for the indoor wideband code\r\ndivision multiple access (WCDMA) repeater applications. One approach is to construct the single-feed switchable feed network\r\nstructure with an MS/NRI coupled-line coupler in order to reduce the mutual coupling level between antennas. Another approach\r\nis to insert the soft surface unit cells near the edges of the microstrip patch elements in order to reduce backward radiation\r\nwaves. In order to further improve the isolation level, the server antenna and donor antenna are installedin orthogonal direction.\r\nThe fabricated antenna exhibits a gain over 7 dBi and higher isolation level between server and donor antennas below -70 dB at\r\nWCDMA band.
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