Abstract
High-Selectivity Bandpass Filter Based on Two Merged Ring Resonators
Highlights
In the modern wireless communication systems, highperformance bandpass filters (BPFs) with low insertion loss in the passband and high out-of-band suppression are extremely desirable
In [3], a dual-mode ring resonator fed by quarter-wavelength side-coupled lines is analyzed
The filter structure can be seen as the two one-wavelength ring resonators merged each other with λg/2 merged length in the middle and λg/4 coupled to input and output feedlines
Summary
In the modern wireless communication systems, highperformance bandpass filters (BPFs) with low insertion loss in the passband and high out-of-band suppression are extremely desirable. Numerous different methods for designing high-performance BPFs have been presented, such as using coupled line structures [1], [2], ring resonators [3], [4], spoof surface plasmon polaritons [5], [6], transversal signal-interference techniques [7]. In [1], a compact seventh-order wideband BPF with sharp roll-off skirts using coupled lines and open/shorted stubs is proposed. The open/shorted stubs are utilized to introduce more transmission zeros (TZs) and acquire better performance in the stopband. In [3], a dual-mode ring resonator fed by quarter-wavelength side-coupled lines is analyzed. The resonator synthesis is developed to calculate the center frequency, bandwidth, TZs and insertion loss. In [7], transversal signal-interference concept is utilized that employing two different transmission paths for the BPF.
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