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This paper presents two Q-band bandpass filter designs that are targeted for application in the Atacama large millimeter-wave and submillimeter-wave array (ALMA) radio telescope. The bandpass filter is required to reject the lower side band from 15.2~29 GHz and retain minimum loss across the passband of 31.3~45 GHz. The bandpass filter based on WR22 waveguide is first presented. Specifically, the...
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