Abstract
This paper presents a novel filtering single-poledouble-throw (SPDT) switch with continuously tunable center frequency and insertion phase. It is comprised of six varactorloaded microstrip resonators and three tunable non-resonating nodes (NRNs) at source and loads. The controllable mixed electromagnetic couplings are introduced on the two main paths of each channel of the switch. At ON-state, the designed filtering switch can generate a 4th-order bandpass filtering performance with high selectivity, and the insertion phase can be continuously tuned with a full 3600 tuning range by changing the reactances of NRNs and switching the dominated modes of the mixed couplings. At OFF-state, the mixed electromagnetic couplings are set to zero, and hence high isolation can be realized. To validate the proposed technique, a circuit prototype is designed and fabricated. The measured results suggest that the designed filtering SPDT switch can operate with a tunable center frequency ranging from 1.65 GHz to 1.84 GHz, and its insertion phase at ON-state channel can be continuously tuned from -1800 to 1800. During the whole tuning process, the measured in-band isolation for OFF-state channel keeps better than 40 dB.
Original language | English |
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Pages (from-to) | 1 |
Number of pages | 1 |
Journal | IEEE Transactions on Circuits and Systems I: Regular Papers |
DOIs | |
State | Accepted/In press - 2023 |
Keywords
- Band-pass filters
- Couplings
- Electromagnetic coupling
- Filtering
- Filtering switch
- Filtering theory
- mixed electromagnetic coupling
- phase control
- reconfigurable filter
- Resonators
- SPDT switch
- Switches