Loaded lange coupler

Details Loaded lange coupler Loaded lange coupler

1989-06-21

1990-06-26

Gensler, Paul

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333238, H01P 518

Patent

active

049375415

ABSTRACT:
A loaded Lange coupler embodied as an integrated circuit includes interdigitated strip conductors and lumped-element capacitors. The two interdigitated strip conductors couple the input and direct ports together, and the isolated and coupled ports together. A capacitor extends between each of the input and coupled ports and the isolated and direct ports. Further, a capacitor extends between each of the midpoints of the strip conductors and ground. This coupler is formed as an integrated circuit in which the current-to-ground capacitors are substantially in line between opposite port pairs and the strip conductors extend around these capacitors.

REFERENCES:
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patent: 3516024 (1970-06-01), Lange
patent: 4375054 (1983-02-01), Pavio
patent: 4376921 (1983-03-01), Dickens et al.
patent: 4482873 (1984-11-01), Nyhus
patent: 4636754 (1987-01-01), Presser et al.
patent: 4800345 (1989-01-01), Podell et al.
Lange, "Interdigitated Strip-Line Quadrature Hybrid", MTTS Digest of Technical Papers, Dallas, TX, 5/5-7/69, pp. 10-13.
Waterman, Jr. et al., "GaAs Monolithic Lange and Wilkinson Couplers", IEEE Transactions on Electron Devices, vol. ED-28, No. 2, Feb. 1981, pp. 212-216.
Brehm et al., "Monolithic GaAs Lange Coupler as X-Band", IEEE Transactions on Electron Devices, vol. Ed-28, No. 2, Feb. 1981, pp. 217-218.
Tajima et al., "Monolithic Hybrid Quadrature Couplers (Braided Structures)", IEEE GaAs IC Symposium, 1982, pp. 154-155.
Kumar et al., "Monolithic GaAs Interdigitated Couplers", IEEE, 1983, pp. 359-362.
Kemp et al., "Ultra-Wideband Quadrature Coupler", IEEE Transactions, 1983, pp. 197-199.
Shibata et al., "Microstrip Spiral Directional Coupler", IEEE Transactions, 1981, pp. 680-689.

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