Suppression of coupled-slotline mode on CPW using air-bridges measured by picosecond photoconductive sampling

Author

Lee, Jongjoo ; Lee, Heeseok ; Kim, Woopoung ; Lee, Jaehoon ; Kim, Joungho

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea

Volume

9

Issue

7

fYear

1999

fDate

7/1/1999 12:00:00 AM

Firstpage

265

Lastpage

267

Abstract

For the first time, the effect of air-bridges on the suppression of the unwanted coupled-slotline (CSL) mode on a coplanar waveguide (CPW) is experimentally observed up to 250-GHz bandwidth, based on the picosecond photoconductive sampling technique. The CSL mode is initially originated from the asymmetric pulse generation on the CPW using ultrashort laser pulses and photoconductive switches. We find that more than two crossover air-bridges are needed to remove the unwanted CSL modes. The parasitic capacitance for the crossover air-bridge over the CPW and the parasitic inductance for the ground connecting air-bridge along the CPW are crucial in determining the signal distortion

Keywords

capacitance; coplanar waveguide components; coplanar waveguides; inductance; microwave photonics; millimetre wave integrated circuits; millimetre wave measurement; photoconducting switches; pulse measurement; signal sampling; 250 GHz; CPW; CSL mode; air-bridges; asymmetric pulse generation; coplanar waveguide; coupled-slotline mode suppression; crossover air-bridge; ground connecting air-bridge; parasitic capacitance; parasitic inductance; photoconductive switches; picosecond photoconductive sampling; signal distortion; ultrashort laser pulses; Bandwidth; Coplanar waveguides; Laser modes; Laser noise; Optical pulse generation; Photoconductivity; Pulse generation; Sampling methods; Switches; Waveguide lasers;

fLanguage

English

Journal_Title

Microwave and Guided Wave Letters, IEEE

Publisher

ieee

ISSN

1051-8207

Type

jour

DOI

10.1109/75.774141

Filename

774141