Ultra-Wideband LTCC Ridge Waveguide Filters

• Published in: IEEE microwave and wireless components letters 2007-02, Vol.17 (2), p.115-117
• Main Authors: Ruiz-Cruz, J.A., Yunchi Zhang, Zaki, K.A., Piloto, A.J., Tallo, J.
• Format: Article
• Language: English
• Subjects: Applied sciences; Band pass filters; Ceramics; Circuit properties; Conductors; Electric, optical and optoelectronic circuits; Electronic circuits; Electronics; Exact sciences and technology; Frequency filters; Joining; Low temperature co-fired ceramic (LTCC) bandpass filter (BPF); Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits; Microwaves; Mode matching methods; Planar waveguides; Printing; Resonator filters; ridge waveguide filter; Ridges; Stripline; Striplines; Temperature; Ultra wideband technology; ultra-wideband (UWB) filter; Walls; Waveguide filters
• ISSN: 1531-1309; 2771-957X; 1558-1764; 2771-9588
• DOI: 10.1109/LMWC.2006.890333

The design and experimental validation of an ultra-wideband (UWB) filter in a low temperature co-fired ceramic (LTCC) is presented. The bandpass filter uses ridge waveguide resonators realized in LTCC by printing parallel planar conductors for the top and bottom walls and closely spaced metal filled vias for the lateral walls. Filter coupling scheme and stripline transitions are developed for the UWB requirement. The mode-matching method is used in their design. The LTCC via effect and the measurement setup are also addressed. Finally, experimental results of a nine-order filter (design passband from 3 to 9GHz) are presented