Qi-Fu Wei

A Novel Single-Cavity Dual Mode Substrate Integrated Waveguide Filter With Non-Resonating Node

A single-cavity novel dual mode substrate integrated waveguide (SIW) filter with non-resonating node (NRN) is presented. The NRN is implemented by etching a coplanar waveguide on the top metal layer of SIW cavity. Under such circumstances, the filter occupies similar area in comparison with conventional two-pole SIW counterparts, but exhibits better frequency selectivity. The measured S-parameters of the realized filter agree well with the simulated ones, with its good performance predicted.

An Extended Doublet Substrate Integrated Waveguide (SIW) Bandpass Filter With a Complementary Split Ring Resonator (CSRR)

An ldquoextended doubletrdquo bandpass filter (BPF) is proposed using a substrate integrated waveguide (SIW) cavity with a complementary split ring resonator (CSRR) etched on its top metal plane. Thus, a single-layer BPF with two transmission zeros is realized successfully, with no additional area or layers occupied. The measured and simulated S-parameters of the filter are presented to show its predicted performance, with good agreements obtained between them.

Investigation on some novel multi-layered cross-coupled substrate integrated waveguide (SIW) circular cavity filters

Two novel multi-layered cross-coupled SIW circular cavity filters with different coupling structures are proposed in this paper. Their different spurious responses are examined and compared numerically. The filter samples are designed using standard LTCC technology and measurement results will be reported soon.

Dual-mode filter design based on uniform or stepped impedance resonator

This article presents a design of compact microstrip dual-mode filter. The design uses dual-mode resonators developed from a uniform or stepped impedance resonator with a load tapped at the middle of the resonator. Four different types of loads can be employed to excite an additional even mode. This kind of dual-mode resonator is applicable in filter design. To validate the new approach, several bandpass filters are designed, fabricated and measured. Measurements have verified the effectiveness of the method.