A capacitively loaded half-wavelength tapped-stub resonator

Author

Drozd, J. Michael ; Joines, William T.

Author_Institution

Dept. of Electr. & Comput. Eng., Duke Univ., Durham, NC, USA

Volume

45

Issue

7

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

1100

Lastpage

1104

Abstract

This paper examines a new resonator which is created by adding capacitive loading to a half-wavelength tapped-stub resonator. This capacitively loaded resonator has the property that both the Q and the resonant frequency can be set independently. This property is important because it allows this resonator to be used as either a tracking filter which maintains a constant bandwidth or as a filter which can vary its Q while maintaining a fixed resonant frequency. In this paper, equations are derived for choosing capacitance values that yield a desired resonant frequency and value of Q. Examples of using this resonator as both a fixed-frequency variable-Q filter and a constant-bandwidth tracking filter are provided. Theoretical results are verified by measurements

Keywords

Q-factor; UHF filters; band-pass filters; capacitance; microstrip filters; microstrip resonators; passive filters; resonator filters; tracking filters; capacitance values; capacitively loaded resonator; constant bandwidth; half-wavelength resonator; resonant frequency; tapped-stub resonator; tracking filter; variable-Q filter; Band pass filters; Bandwidth; Capacitance; Capacitors; Equations; Resonance; Resonant frequency; Resonator filters; Transmission line theory; Voltage;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.598447

Filename

598447