Adjustable microwave power divider

Details Adjustable microwave power divider Adjustable microwave power divider

1993-09-21

1995-11-14

Lee, Benny

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333 33, 333128, H01P 512

Patent

active

054670632

ABSTRACT:
An adjustable microwave power divider circuit (50), providing the capability of adjusting the power division ratio after the device has been fabricated. The device includes three 90 degree transmission line networks (60, 70, 80) incorporating open transmission line stubs (66, 76, 86), two networks (70, 80) as power division networks, and the third network (60) as an input impedance matching network. A series isolation resistor (90) is connected across the outputs of the power division networks. In operation, an input signal is split between the two power division networks (70, 80) with equal voltage and phase. The power split between the two outputs is adjusted by adjusting the open stub length, thereby varying the characteristic impedance level between the two power division networks. Any signal reflected back into any one of the power divider networks is absorbed by the isolation resistor. The stub length can be trimmed after device fabrication using a laser or abrasion system.

REFERENCES:
patent: 4127831 (1978-11-01), Riblet
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patent: 4901042 (1990-02-01), Terakawa et al.
"Split-Tee Power Divider," L. I. Parad and R. L. Moynihan, IEEE Trans, MTT, Jan. 1965, pp. 91-95.
"Coupled Strip Transmission Line Filters and Directional Couplers," E. M. T. Jones and J. T. Bolljahn, IRE Trans. MTT, vol. MTT-4, Apr. 1956, pp. 75-81.
"An Interdigitated Stripline Quadrature Hybrid," J. Lange, IEEE MTT, Dec. 1969, pp. 1150-1151.
"Hybrid Ring Directional Coupler for Arbitrary Power Divisions," C. Y. Pon, IRE Trans. MTT, Nov. 1961, pp. 529-535.
"An N-Way Hybrid Power Divider," E. J. Wilkenson, IRE Trans. MTT, Jan. 1960, pp. 116-117.

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