This article reports a single layer tri-band bandpass, polarization insensitive Frequency Selective Surface (FSS). The unit cell is designed by considering different square loop elements and cross dipole element to pass Wi-Max and WLAN frequency range with low loss. Three different shapes of loops and one cross dipole are arranged in a way that gives a triple-band-pass characteristic from the proposed structure. These loops and dipole are designed to pass Wi-MAX (2.5-2.7 GHz, 3.4-3.6 GHz) and WLAN (center frequency, 5.5 GHz) bands. The structure performance is independent of incidence angle of wave due to its symmetrical geometry which makes the design polarization insensitive and achieves good angular stability. A 14x14 array of proposed unit cell is realized and measured. The proposed FSS achieves a 3 dB transmission bandwidth of 25% at 2.6 GHz, 65.6% at 3.5 GHz and 65.6% at 5.5 GHz. The advantage of the proposed design is that it has a simple and compact geometry fabricated on a low-cost substrate and achieved tri-band band pass response with a wide angular stability.
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