Four-port network for separating two signals comprised of doubly

Wave transmission lines and networks – Plural channel systems – Having branched circuits

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333 21A, H01P 1161, H01P 1213

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active

043440487

ABSTRACT:
A four-port network for separating signals comprised of two doubly polarized frequency bands for an antenna feeder system in directional or satellite radio operation, wherein a first polarization converter for converting linear polarization to circular polarization, and vice versa, is designed for the lowest inherent ellipticity in the lower frequency band and is connected ahead of a symmetric polarization filter for the lower frequency band, and a second polarization converter which compensates the remaining ellipticity in the upper frequency band is connected between the symmetrical polarization filter and a further polarization filter for the upper frequency band. The second polarization converter for compensating the remaining ellipticity in the upper frequency band includes two different types of wavecoupling means with the first wavecoupling means reducing the frequency dependence of the remaining ellipticity but simultaneously increasing the amount of the remaining ellipticity and the other wavecoupling means having the resulting effect that the amount of the remaining ellipticity and additionally its frequency dependence are reduced to a minimum.

REFERENCES:
patent: 3758882 (1973-09-01), Morz
patent: 3978434 (1976-08-01), Morz et al.
patent: 4047128 (1977-09-01), Morz
Morz, Analysis and Synthesis of Electromagnetic Wavefields in Reflector Antennas, etc., Dissertation, 1978, pp. 75-81.

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