DocumentCode
2639059
Title
High Directivity Microstrip Couplers Using Dielectric Overlays
Author
Buntschuh, Charles
Author_Institution
Microwave Assoc., Inc., Burlington, MA, USA
fYear
1975
fDate
12-14 May 1975
Firstpage
125
Lastpage
128
Abstract
Coupled-line directional couplers in microstrip suffer from low directivity due to the inequality of the even and odd mode wave velocities. A dielectric overlay improves the directivity, but it also tightens the coupling and depresses the coupler impedance. Design curves are presented for making velocity-compensated 50 ohm couplers taking the changes in coupling and impedance into account.
Keywords
impedance matching; microstrip directional couplers; coupled-line directional couplers; coupler impedance; coupling; design curves; dielectric overlays; even mode wave velocity; high directivity microstrip couplers; odd mode wave velocity; resistance 50 ohm; velocity-compensated couplers; Couplers; Coupling circuits; Dielectric constant; Dielectric substrates; Distributed parameter circuits; Impedance; Microstrip; Stripline; Strips; Transmission line theory;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Symposium, 1975 IEEE-MTT-S International
Conference_Location
Palo Alton, CA
Type
conf
DOI
10.1109/MWSYM.1975.1123304
Filename
1123304
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