New 4-pole dual-mode resonator filter using composite-right/left-handed line

Hieng Tiong Su, K. K. Fong, Manas K. Haldar, M. L. Dennis Wong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


Dual-mode resonators have been widely investigated to realize RF/microwave filters. An attractive feature of this type of resonator is that each dual-mode resonator can be used as
a doubly tuned resonant circuit. This reduces the number of resonators required for an n-degree filter to half, resulting in a compact filter structure for light weight, small size and low
cost applications.

Conventional dual-mode resonators include circular disk, square patch, circular ring, square loop and meander loop, with a small perturbation applied to the resonator at a location 45 degrees offset from its two orthogonal modes. The coupling between the two modes is determined by the size of the perturbation element added to the resonator. Although
dual-mode resonators have been widely investigated, very few dual-mode resonator filters of the order of four or more have been reported.

Recently, there has been considerable interest in using composite-right/left-handed transmission line (CRLH) in dual-mode ring resonators. This is a relatively new idea, where coupling between the two modes is determined by the degree of mismatch between the composite lines. Besides, the main advantage of using a composite line in a ring resonator is
the suppression of the second harmonic. This paper reports the design of a new 4-pole dual-mode resonator filter with a Chebyshev response, based on earlier work.
Original languageEnglish
Title of host publicationProceedings of 2008 Asia Pacific Microwave Conference, APMC 2008
Place of PublicationPiscataway (New Jersey)
Number of pages4
ISBN (Electronic)9781424426423
Publication statusPublished - 2008
Event2008 Asia Pacific Microwave Conference - Hong Kong, China
Duration: 16 Dec 200820 Dec 2008 (Conference website)


Conference2008 Asia Pacific Microwave Conference
Abbreviated titleAPMC 2008
CityHong Kong
Internet address

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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