Abstract

A miniaturized Ku-band bandpass filter is proposed in this paper by using low-temperature cofired ceramic (LTCC) technology. Compared with single-layer printed circuit board (PCB) process, the advantages of LTCC technology are introduced, and fully used to implement the bandpass filters. First, a multi-layer dual-composite right- and left-handed (D-CRLH) resonator is realized in LTCC process. For miniaturization, the multi-layer microstrip section inductor and bulk inter-digital capacitor are both used. Second, a multi-layer coupling structure is designed flexibly for D-CRLH bandpass filter, based on which the mixed couplings are introduced. Accordingly, multiple transmission zeroes are realized for a high selectivity and wide stopband. Finally, a Ku-band LTCC filter is designed, fabricated and measured. The circuit size is of only 0.091×0.063×0.033 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g3</sub> , while with low insertion loss and wide stopband suppression. With above features, the proposed LTCC filter is quite suitable for system-in-package (SiP) systems.

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