Abstract
ABSTRACT A novel compact low-temperature-cofired ceramic (LTCC) bandpass filter with sharp rejection and wide stopband is presented in this paper. Semi-lumped resonant cells composed of multilayer ceramic capacitors and via-hole inductors are utilized with source–load coupling, thus two transmission zeros (TZs) can be generated near both sides of the passband, resulting in a high skirt selectivity and wide harmonic suppression. A LTCC bandpass filter works from 2.1 to 2.3 GHz has been designed and fabricated in a four-layer substrate to verify the proposed topology. With an extremely compact size of 2.0 mm × 1.25 mm × 0.9 mm, the design is highly integrated and suitable for miniaturized modern wireless communication applications.
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