Four-port phase and amplitude equalizer for feed enhancement of

Details Four-port phase and amplitude equalizer for feed enhancement of Four-port phase and amplitude equalizer for feed enhancement of

1996-07-17

1998-02-10

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a steerable array

342149, 342151, 342154, 333117, 333136, H01Q 322, H01Q 324

Patent

active

057174059

ABSTRACT:
A four-port transmission line device that processes two incoming RF signals of arbitrary phase and amplitude to output two corresponding RF signals of equal phase and amplitude. Two sets each of two quarter-wave transmission line segments are connected in series between corresponding input and output ports. A short circuit interconnect shorts together the junctions of the two series connected line segments. A resistive element is connected across the two input ports, and another resistive element is connected across the two output ports. The short circuit interconnection forces the combination of the two input signals into one resultant signal at the short circuited junction. Out-of-phase components of the resultant signal are absorbed in the resistor across the input ports. The remaining in-phase components are divided into two outputs signals of equal phase and amplitude. The device is incorporated into the feed networks of linear and two-dimensional monopulse phased arrays to provide reduced difference sidelobe levels.

REFERENCES:
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patent: 4719465 (1988-01-01), Kuroda
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patent: 4849763 (1989-07-01), DuFort
patent: 4916410 (1990-04-01), Littlefield
patent: 4989011 (1991-01-01), Rosen et al.
patent: 5079527 (1992-01-01), Goldfarb
patent: 5162804 (1992-11-01), Uyeda
patent: 5506589 (1996-04-01), Quan et al.

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