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US 5,499,001 AGranted
Cavity matched hybrid coupler
OwnerJoginder S. Degun, Robert Ahuliiinventors
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OwnerJoginder S. Degun, Robert Ahuliiinventors
Estimating the term…
A microwave coupler is disclosed which includes an aluminum housing forming a cavity with upper and lower ground planes. A pair of substantially square-shaped conductors are supported within the cavity and symmetrically located with respect to the upper and lower ground planes. Each conductor has overlapping central portions and second and third portions extending in opposite directions at a 90 degree angle from the central portion to form a substantially H shaped configuration. A fourth portion extends at a 90 degree angle from the third portion of each conductor. The central portions of each conductor are 1/4 wavelength and extend in parallel planes, separated by an air dielectric. The terminating portions of each conductor are provided with contacts providing input/output ports (A,B,C,D). The contacts are maintained in position by supports attached to the walls of the cavity at the central portions as well at the terminating portions. To compensate for the inductance introduced by the conductor bends, the cavity is machined in the vicinity of the 90 degree bends to create an increase in capacitance to compensate for the inductance and thereby achieve a substantially 3 db split between the input and output ports. A 4-way, 6 db coupler is also disclosed.
A 3 dB hybrid coupler comprising a housing forming a cavity with upper and lower ground planes, first and second conductors supported within said cavity, each conductor having a central portion which is a multiple of a quarter-wave length and second and third portions extending from said central portion in opposite directions forming substantially 90 degree bends in said conductors, said central portion of each conductor overlapping the other for its entire length to form a generally H shaped configuration with a coupling region for coupling electromagnetic energy between the two conductors, said housing including an inner wall having capacitive tuning portions integrally formed therewith in the vicinity of the coupling region adjacent the conductor bends, said capacitive tuning portions cooperating with the first and second conductors to create an increase in capacitance to compensate for discontinuities introduced by said bends.
A 6 dB hybrid coupler comprising a housing forming a cavity with upper and lower ground planes, first, second, third and fourth conductors supported within said cavity, each of said first and second conductor having a central portion of reduced cross-sectional thickness which is a multiple of a quarter-wave length and second and third portions extending from said central portion in opposite directions forming substantially 90 degree bends in said conductors, each of said first and second conductor includes a fourth portion extending from said second portion forming an additional substantially 90 degree bend in each of said first and second conductors, each of said third and fourth conductors having a pair of end portions of reduced cross-sectional thickness each of which end portions are a multiple of a quarter-wave length and terminate in a substantially 90 degree bend, an integral generally S-shaped portion of substantially square cross-section terminating in substantially 90 degree bends which interconnect said end portions, said central portion of said first conductor overlapping an end portion of said third conductor to form a coupling region for coupling electromagnetic energy between said first and third conductors, said central portion of said second conductor overlapping an end portion of said fourth conductor to form a coupling region for coupling electromagnetic energy between said second and fourth conductors, the other end portions of said third and fourth conductors overlapping to form a coupling region for coupling electromagnetic energy between said third and fourth conductors, said housing including an inner wall having capacitive tuning portions integrally formed therewith in the vicinity of the coupling region adjacent the conductor bends to compensate for discontinuities introduced by said bends.
Dependencies are inferred from the claim text.