Abstract
A miniaturized and high rejection band pass filter (BPF) realized by low-temperature cofired ceramic technology are presented in this paper. The design consists of conducting patterns distributed on different dielectric layers. Grounded combline resonators loaded with capacitors are used as a basic topology for the design of the proposed filter. The capacitor has been realized using metal-insulator-metal concept in LTCC technology. To achieve the rejection in the BPF, a transmission zero has been realized by introducing a non-adjacent coupling. The location of transmission zeros can be controlled using the length of this U-shaped coupling transmission line. An extra coupling pad has been introduced to maintain the coupling coefficients between the resonators. A filter has been designed and simulated for Ku-band (12.7-13.0) GHz with 1-dB absolute bandwidth of 310 MHz. A rejection of 80 dB has been achieved at 16.10 GHz. The overall size of the filter is 6.5 mm x 2.58 mm x 0.48 mm.
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