Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1991-04-29
1992-04-14
Healy, Brian
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333115, 333238, H01P 518
Patent
active
051051710
ABSTRACT:
A coplanar waveguide directional coupler (116,134) may be formed on a surface (102a,106a) of a substrate (102) and/or a microwave monolithic integrated circuit (MMIC) chip (106), with the MMIC chip (106) being flip-chip mounted on the substrate (102). The directional coupler (116,134) includes an input port (114,136), a coupled port (126,154), a direct port (122,152) and an isolation port (1118,150) formed on the surface (102a,106a). At least two parallel first striplines (24,26) are formed on the surface (102a,106a), having first ends connected to the input port (114,136) and second ends connected to the direct port (122,152). At least two parallel second striplines (36,38) are formed on the surface (102a,106a), having first ends connected to the coupled port (126,154) and second ends connected to the isolation port (118,150). The second striplines (36,38) are interdigitated with the first striplines (24,26) to provide tight signal coupling therebetween. First and second main ground planes (52,54) are formed on the surface (102a,106a) and extend parallel to and on opposite respective sides of the interdigitated first and second striplines (24,26,36,38). The input port (114,136), coupled port (126,154), direct port (122,152) and isolation port (118,150) each include a coplanar waveguide section having a center conductor (14a,16a,18a,20a) connected to the ends of the respective striplines (24,26,36,38), and first and second ground planes (14b,14c), (16c,16c), (18b,18c, (20b,20c) which extend parallel to the center conductor (14a,16a,18a,20a) on opposite sides thereof and are connected in circuit to the main ground planes (52,54).
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Mendolia Gregory S.
Wen Cheng P.
Denson-Low W. K.
Gudmestad Terje
Healy Brian
Hughes Aircraft Company
Walder Jeannette M.
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