This paper presents a new multilayered stripline hairpin bandpass filter using a broadside-coupled hairpin resonator in a low-temperature co-fired ceramic(LTCC) substrate. By using the new structure designs accomplish the vertical coupling in multilayer system, the size of the proposed filter can be reduced about 50% compared to an equivalent single-layer hairpin resonator filter. As an example, an L-band filter centered at 1.10 GHz with a fractional bandwith of 13.5% is designed, fabricated, and measured. The measured results of the fabricated filters agree very well with the electromagnetic simulations.
Ａ Method for Improving Out-of-Band Characteristics of a Wideband Bandpass Filter in an LTCC Substrate
