Coupler having arbitrary impedance transformation ratio and arbi

Details Coupler having arbitrary impedance transformation ratio and arbi Coupler having arbitrary impedance transformation ratio and arbi

1980-03-03

1981-12-08

Gensler, Paul L.

Amplifiers

With distributed parameter-type coupling means

330286, 333116, 333111, H03F 360, H01P 518

Patent

active

043050433

ABSTRACT:
An impedance transforming coupler is disclosed which may be used as a power divider or power combiner at microwave frequencies. The power division or power combination ratio is arbitrary, and the impedance transformation ratio is arbitrary. These couplers may be used in a circuit to power-combine amplifiers. The insertion loss of the circuit is low and the bandwidth is improved by an order of two to one over prior art systems which had separate circuits for matching the impedance and providing power combining. The coupler is optimally a branch line coupler having four curved branches a quarter wavelength long at the center frequency. The output ports are 90.degree. out of phase. Simple formulas are given relating the desired admittances of each of the four branches to k, the desired power coupling ratio, and Y, the desired admittance transformation ratio.

REFERENCES:
patent: 3423688 (1969-01-01), Seidel
patent: 3516024 (1970-06-01), Lange
patent: 3654570 (1972-04-01), Thomas
patent: 3772616 (1973-11-01), Imoto
patent: 3911372 (1975-10-01), Seidel
patent: 4027254 (1977-05-01), Gunton et al.
patent: 4127831 (1978-11-01), Riblet
patent: 4127832 (1978-11-01), Riblet

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