A novel defected ground structure and its application to a microwave oscillator

Author

Jung, Myeong-Sub ; Park, Jun-Seok ; Lim, Jae-Bong ; Cho, Hong-Goo

Author_Institution

Sch. of Electr. Eng., Kookmin Univ., Seoul, South Korea

Volume

2

fYear

2003

fDate

7-9 Oct. 2003

Firstpage

781

Abstract

This paper presents a new defected ground structure (DGS) and its application to a microwave oscillator. The presented oscillator is designed so as to use the suggested defected ground structure as a feedback loop inducing a negative resistance as well as a frequency-selective circuit. Applying the feedback loop between the drain and the gate of a FET device produces a high gain and precise phase conversion in the feedback loop. The equivalent circuit parameters of the DGS are extracted by using a three-dimensional EM calculations and simple circuit analysis method. The implemented 9 GHz oscillator provides +8.5 dBm output with high power efficiency over 40%.

Keywords

feedback; microwave oscillators; negative resistance; 9 GHz; DGS; FET device; defected ground structure; feedback loop; frequency-selective circuit; microwave oscillator; negative resistance; phase conversion; three-dimensional EM calculations; Equivalent circuits; Etching; Feedback circuits; Feedback loop; Frequency; Microstrip; Microwave FETs; Microwave circuits; Microwave devices; Microwave oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2003. 33rd European

Print_ISBN

1-58053-834-7

Type

conf

DOI

10.1109/EUMC.2003.1263006

Filename

1263006