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We report a novel approach for dynamically tuning and reconfiguring microwave bandpass filters (BPFs) based on optically controlled switching elements using photoconductivity modulation in semiconductors. For a prototype demonstration, a BPF circuit featuring a second‐order design using two closely coupled split‐ring resonators embedded with multiple silicon chips (as switching elements) was designed,...
In this paper, a compact fourth-order cascade quadruplet (CQ) passband filter (BPF) with improved selectivity is proposed based on the dual-metal-plane structure. To further improve the selectivity, more finite frequency transmission zeros (TZs) can be employed via introducing mixed electric/magnetic (EM) coupling in the cross-coupled arm between the nonadjacent resonators of the conventional CQ filter...
In this paper, a compact fourth-order cascade quadruplet (CQ) passband filter (BPF) with improved selectivity is proposed based on the dual-metal-plane structure. To further improve the selectivity, more finite frequency transmission zeros (TZs) can be employed via introducing mixed electric/magnetic (EM) coupling in the cross-coupled arm between the nonadjacent resonators of the conventional CQ filter...
A compact bandpass filter with wide stopband using stepped impedance resonators has been designed and fabricated. And open ended stubs for frequency fine tuning are introduced. The new passband filter was analyzed, simulated and fabricated. Measured results are in good agreement with the electromagnetic simulation results. Moreover the circuit only occupies 20.1 × 17.1 mm2(≈0.21 λg × 0.16λg).
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