A design procedure is presented for narrow bandstop filters using TEM transmission line L resonators, which are intermediate of the gap-and parallel-coupled resonators typically used. In this configuration, parallel coupling occurs over a portion of the resonator length, with the remaining resonator length forming a stub. The grounded end of the resonator may be in either the coupled or stub portion of the resonator. Uncoupled Through Lines Coupled-line Pair Shunt Stub sh deg* z o 7 L-2 6, deg* z , , z , f2 b, deg*

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