High Q printed helical resonators and filters

Author

Broomfield, Carl ; Everard, Jeremy

Author_Institution

Dept. of Electron., York Univ., UK

fYear

2003

fDate

4-8 May 2003

Firstpage

819

Lastpage

822

Abstract

High Q compact printed helical resonators are described operating around 1.8 to 2 GHz. These consist of a multilayer PCB incorporating a printed helical transmission line. Losses in the via holes are reduced by ensuring that the standing wave current at this point is near zero. This ensures a significant increase in Q (around 4x). Further increased energy storage per unit volume is achieved due to the 3D helical nature of the resonator. Unloaded Qs of 235 and 195 have been obtained on low loss PCBs with dielectric constants of 2.2 and 10.5 respectively. As a further demonstrator a three-section filter, designed to offer the response required by the front end filter of a modern GSM phone, has been developed.

Keywords

Q-factor; dielectric resonators; energy storage; permittivity; printed circuits; radiotelephony; resonator filters; 1.8 to 2 GHz; GSM band; Q printed helical resonator; Q-factor; dielectric constant; energy storage; helical filter; helical transmission line; multilayer PCB; standing wave current; three section filter; Dielectric constant; Dielectric losses; Energy storage; Frequency measurement; High-K gate dielectrics; Q measurement; Resonance; Resonant frequency; Resonator filters; Transmission lines;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum, 2003. Proceedings of the 2003 IEEE International

ISSN

1075-6787

Print_ISBN

0-7803-7688-9

Type

conf

DOI

10.1109/FREQ.2003.1275196

Filename

1275196