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Switched Dual-Band SAW Filter Using Vanadium Oxide Switches

This paper presents an implementation of a switchable dual-band surface acoustic wave (SAW) filter using Vanadium Oxide (VO2) switches. The filter has four switching states: a) transmission only of the lower channel of 765MHz, b) transmission only of the upper channel of 935MHz, c) transmission of both channels and d) no transmission. Switching between the four states is implemented using Vanadium Oxide (VO2) switches strategically integrated within the resonators of the proposed filter structure. Experimental results are presented for a switchable dual-band filter where each channel is of order 5. The dual-band filter demonstrates a measured insertion loss of 3.7dB and 3.9dB in the transmission states at 765MHz and 935MHz respectively, while demonstrating rejection at the same frequencies in the OFF states.