Abstract
This paper proposes substrate integrated waveguide
(SIW) cavity resonator and SIW 2-pole filter with very compact
size implemented in LTCC (Low-Temperature Co-fired Ceramic)
for 10-GHz applications. In order to miniaturize the size of the
circuit and to improve its performance, multilayered structure
and the LTCC technology are employed to design and fabricate
the filter. The SIW structures are based on a combline topology
completely embedded into HL2000 substrate, showing good Q-
factor and improving selectivity. The cavity resonator shows
a very compact implementation, and the resulting estimated
Q-factor and resonance frequency are 160 and 11:5 GHz,
respectively. The proposed SIW filter consists of a pair of
combline resonators coupled by means of powered magnetic
iris coupling and it exhibits an estimated insertion loss 2 dB
at 10:75 GHz and the return loss is better than 15 dB with an
equi-ripple fractional bandwidth (FBW) of 3:25% (350 MHz).
The designed SIW structures present the advantages of improved
selectivity with reduced radiation problems due to the isolating
gaps.
