High Q Printed Helical Resonators for Oscillators and Filters

High Q compact printed helical resonators which operate from around 1.8 to 2 GHz are described. These consist of a multilayer printed circuit board (PCB) incorporating a printed helical transmission line. Loss in the via hole is reduced by ensuring that the standing wave current at this point is nea...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2007-09, Vol.54 (9), p.1741-1750
Main Authors: Everard, J.K.A., Broomfield, C.D.
Format: Article
Language:English
Subjects:
Amplifiers, Electronic
Applied sciences
Band pass filters
Bandpass filters
Circuit boards
Circuit properties
Computer-Aided Design
Digital broadcasting
Distributed parameter circuits
Electric, optical and optoelectronic circuits
Electronics
Electronics - instrumentation
Energy storage
Equipment Design
Equipment Failure Analysis
Exact sciences and technology
Filtering theory
Filtration - instrumentation
Filtration - methods
Helical
Low noise
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Noise
Nonhomogeneous media
Oscillators
Oscillometry - instrumentation
Printed circuit boards
Printed circuits
Resonator filters
Resonators
Signal to noise ratio
Transducers
Transmission line theory
Transmission lines
Vibration
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Description
Summary:High Q compact printed helical resonators which operate from around 1.8 to 2 GHz are described. These consist of a multilayer printed circuit board (PCB) incorporating a printed helical transmission line. Loss in the via hole is reduced by ensuring that the standing wave current at this point is near zero. This ensures a significant increase in Q. Further increased energy storage per unit volume is achieved due to the 3-D 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. Two applications for these resonators are described in this paper. The first is the design of a compact low noise oscillator where the ratio of Q L /Q o , and hence insertion loss, is adjusted for low noise. The 2-GHz oscillator demonstrates a phase noise of -120 dBc/Hz at 10 kHz which is predicted exactly by the theory. The second is a three- section filter designed to offer the response required by the front end filter of a modern GSM mobile telephone. In the filter design three helical resonators are coupled together to produce a completely printed triplate bandpass filter.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2007.459