Miniaturized bandpass filters with double-folded substrate integrated waveguide resonators in LTCC
Journal
IEEE Transactions on Microwave Theory and Techniques
Journal Volume
57
Journal Issue
7
Pages
1774-1782
Date Issued
2009-07
Author(s)
Abstract
This paper proposes miniaturized bandpass filters with double-folded substrate integrated waveguide (SIW) resonators using multilayer low-temperature co-fired ceramic (LTCC) technology. Formed by inserting a metal plate with two orthogonal slots into the cavity, the double-folded SIW resonator is used for the circuit size reduction with its footprint about a quarter of the conventional TE101 mode. With LTCC technology, there is more flexibility to organize the cavities of filters because of the 3-D arrangement. The vertically stacked cavities are coupled by "L"- or "U"-shaped slots, and if arranged horizontally, by an inductive window on the common sidewall or a suspended stripline between the cavities. Through experimental measurements and simulations at both the Ka- V -bands, it has been demonstrated that the proposed filter has compact sizes and good frequency responses. The area of the fully stacked Chebyshev filter has 88% size reduction in comparison with a three-pole planar waveguide filter, while the vertically stacked quasi-elliptic filter has 74% size reduction in comparison with a four-pole planar waveguide filter. © 2006 IEEE.
Subjects
Bandpass filter; Cavity; Coupling coefficient; Folded waveguide resonator; Low-temperature co-fired ceramic (LTCC); Miniaturized filter
Other Subjects
Cavity; Coupling coefficient; Folded waveguide resonator; Low-temperature co-fired ceramic (LTCC); Miniaturized filter; Ceramic materials; Circular waveguides; Frequency bands; Frequency response; IIR filters; Microwave circuits; Planar waveguides; Plate metal; Poles; Resonators; Size determination; Three dimensional; Wave filters; Windows; Bandpass filters
Type
journal article