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A dualband bandpass filter topology is proposed, based on a side-coupled ring resonator. The ring is one-wavelength long, and the power is coupled into and out of the ring via two quarter-wavelength coupled-line sections. A dualband bandpass response of first order is obtained, which is symmetrical to the centre frequency, on where the electrical length of the ring is referred. A transmission zero...
Parametric study of a dual-bandpass filter based on a one-wavelength side-coupled dual-mode ring resonator is presented. The change in response of the filter based on the variation of the impedance of its lines is analyzed. The results show that the dualband resonance frequencies and their separation depend simultaneously on the ring line impedance, and the even- and odd-mode impedances of the coupled...
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