Abstract
A compact quad-channel high-temperature superconducting diplexer based on stub-loaded square ring resonator (S-LSRR) is proposed. The proposed resonator consists of a square ring with symmetrically loaded two open-circuited stubs and provides four resonant modes for quad-channel applications. Even- and odd-mode methods are applied to analyze the S-LSRR. Analytical study shows that four resonant modes of one S-LSRR can be designed in two pairs and applied to construct two of four channels of the designed diplexer. A square patch is added to the resonator for providing an additional parameter to tune the resonant modes. Based on the proposed resonator, a quad-channel diplexer with center frequencies of 2.4, 3.2, 3.9, and 5.6 GHz is designed. For demonstration, the diplexer is fabricated on 2-in-diameter 0.5 mm-thick MgO wafer with double sided YBa2Cu3Oy films and measured at 77 K. Good agreement between the simulation and measurement is obtained. The diplexer has a compact size of 0.25 λg × 0.45 λg, where λg is guided wave length at the center frequency of first channel.
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