The isolation enhancement between the donor antenna and the service antenna for indoor repeater systems is presented by using\r\na frequency-selective surface (FSS). A unit cell of the proposed FSS consists of a quarter-wavelength resonator, a chip resistor, an\r\nFR4 substrate, and a ground plane. Applying the unit cells of the proposed FSS embedded a chip resistor on the side walls of each\r\nreflector for indoorWCDMA repeater antennas and aligning them along with the cross-polarization of each antenna, the isolation\r\nis improved by about 13 dB at theWCDMA band.
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