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FIXED AND SELECTABLE MULTIBAND ISOLATION OF DOUBLE POLE DOUBLE THROW SWITCH USING TRANSMISSION LINE STUB RESONATORS FOR WIMAX AND LTE

By A. M. S. Zobilah, N. A. Shairi, and Z. Zakaria

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Abstract:
A novel selectable multiband isolation of Double Pole Double Throw (DPDT) switch with switchable transmission line stub resonators has been proposed for applications of WiMAX and LTE in 2.3 and 3.5 GHz bands. In this paper, two DPDT switch designs are proposed; the first design is a fixed DPDT switch, and the second is a selectable DPDT switch. The second design allows selecting only one band and unselecting the other or selecting both of them. However, the first design does not allow so. The transmission line stub resonator used in this design is an open stub resonator with quarter wave of the electrical length. By using a simple mathematical model, the theory of the transmission line stub resonator was discussed where it can be cascaded and resonated at center frequencies of 2.3 and 3.5 GHz. Moreover, the cascaded transmission line stub resonators can be reconfigured between allpass and bandstop responses using discrete PIN diodes. The key advantage of the proposed DPDT with switchable transmission line stub resonators is a multiband high isolation with minimum number of PIN diodes. Therefore, the simulated and measured results showed less than 3 dB of insertion loss, greater than 10 dB of return loss and higher than 30 dB of multiband isolation in 2.3 and 3.5 GHz bands.

Citation:
A. M. S. Zobilah, N. A. Shairi, and Z. Zakaria, "Fixed and Selectable Multiband Isolation of Double Pole Double Throw Switch Using Transmission Line Stub Resonators for WiMAX and LTE," Progress In Electromagnetics Research B, Vol. 72, 95-110, 2017.
doi:10.2528/PIERB16100903

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