SWITCHABLE DUAL-MODE FILTER

In this article, a novel type of dual-mode resonator for switchable filters is presented. The novel structure is achieved by embedding a pair of crossed slots and spur-lines. The proposed filter provides low-insertion loss, because there. are no coupling gaps and radiation loss in feed structure. Using two PIN diodes mounted inside a pair of spur-lines, the proposed structure works as a switchable filter. The two diodes are utilized to switch the spur-lines ON or OFF. The switchable filter is built with <1.35 dB in the passband. When the diodes are ON, there is isolation over 15 dB in passband. (C) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 3019-3021, 2009: Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24810