A Reconfigurable Bandpass Filter Based on Novel Planar Integrated Switchable and Tunable Resonator with Improved Insertion Loss and Frequency Range

The tradeoff between the unloaded quality factor (Qu) and resonant frequency tunable range of novel planar integrated switchable and tunable resonator is studied. The novel switchable and tunable resonators are designed based on quarter-wavelength resonator with floating strip loaded by varactor diode and PIN diode, and continuously switchable tuning characteristics of the resonant frequency is modeled and investigated. A reconfigurable bandpass filter with continuously tunable frequency and stable bandwidth based on the switchable and tunable resonator with improved Qu is designed, fabricated and measured. The developed component demonstrates a tuning range of 1.05-2 GHz with a typical bandwidth of 124 MHz, and a minimum insertion loss of 1.8 dB.

J. Luo, Q. Xiang*, et al "A Reconfigurable Bandpass Filter Based on Novel Planar Integrated Switchable and Tunable Resonator with Improved Insertion Loss and Frequency Range," in IEEE Transactions on Components, Packaging and Manufacturing Technology, doi: 10.1109/TCPMT.2025.3590724.