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

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 asy...

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Bibliographic Details
Published in:IEEE microwave and guided wave letters 1999-07, Vol.9 (7), p.265-267
Main Authors: Jongjoo Lee, Heeseok Lee, Woopoung Kim, Jaehoon Lee, Kim, Joungho
Format: Article
Language:English
Subjects:
Applied sciences
Asymmetry
Bandwidth
Circuit properties
Coplanar waveguides
Crossovers
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Inductance
Joining
Laser modes
Laser noise
Lasers
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Optical pulse generation
Photoconductivity
Pulse generation
Sampling
Sampling methods
Switches
Waveguide lasers
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Summary: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.
ISSN:1051-8207
1558-2329
DOI:10.1109/75.774141