Title :
Leakage suppression in coplanar waveguide circuits by patterned backside metallization
Author :
Hesselbarth, J. ; Vahldieck, R.
Author_Institution :
Lab. for Electromagnetic Fields & Microwave Electron., Swiss Federal Inst. of Technol., Zurich, Switzerland
Abstract :
Microwave circuits based on coplanar offer advantages compared to microstrip-based designs, but also introduce unwanted coupling or radiation effects due to the excitation of surface waves or parallel plate modes. Special measures must be introduced to suppress these modes. This paper illustrates the effect of substrate waves on coupling between parts of the circuitry. It details the influence of resonances of the substrate modes on this unwanted coupling. A method is proposed to suppress substrate modes and is supported by experimental results.
Keywords :
coplanar waveguides; metallisation; microwave circuits; parallel plate waveguides; waveguide discontinuities; coplanar waveguide circuits; leakage suppression; microwave circuits; parallel plate modes; patterned backside metallization; radiation effects; substrate waves; surface waves; Coplanar waveguides; Coupling circuits; Dielectric substrates; Electromagnetic waveguides; Flexible printed circuits; Metallization; Microstrip; Microwave circuits; Resonance; Surface waves;
Conference_Titel :
Microwave Symposium Digest, 1999 IEEE MTT-S International
Conference_Location :
Anaheim, CA, USA
Print_ISBN :
0-7803-5135-5
DOI :
10.1109/MWSYM.1999.779525
