Abstract

A novel ring resonator which is fed along one of its quarter-wavelength sides is presented. The resonator's response presents a single-mode resonant frequency with a transmission zero at both sides of its passband. Two such resonators are proposed to be combined in series to result in a 3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rd</sup> order bandpass response with a good out-of-band rejection level. The resonator and filter are simulated and fabricated on FR4 microstrip substrate. All the simulation and measurement results are presented in this paper to show its feasibility.

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