. Airborne radar. Airplanes; Guided missiles. 560 ANTENNAS AND RF COMPONENTS Short Phase Shifter. Circulator applications are many and include duplexing, diplexing, isolating, and switching. The circu- lator is also valuable as a unity- coupled directional coupler in reflec- tometer applications,^^ for example. Fig. 10-33 illustrates the application of a four-port circulator to a novel anisotropic transmission line having independently adjustable propaga- tion characteristics in opposite direc- tions through the network. An attenuator and phase shifter in series with short-circuited arm 2 can
. Airborne radar. Airplanes; Guided missiles. 560 ANTENNAS AND RF COMPONENTS Short Phase Shifter. Circulator applications are many and include duplexing, diplexing, isolating, and switching. The circu- lator is also valuable as a unity- coupled directional coupler in reflec- tometer applications,^^ for example. Fig. 10-33 illustrates the application of a four-port circulator to a novel anisotropic transmission line having independently adjustable propaga- tion characteristics in opposite direc- tions through the network. An attenuator and phase shifter in series with short-circuited arm 2 can control the attenuation and phase delay from arm 1 to arm 3, while a similar arrangement on arm 4 can independently control the attenuation and phase delay from arm 3 to arm 1. The differential attenuation and phase delay thus can be made to have any desired values. Circulators are commercially available having forward coupling insertion losses of generally less than db. Isolation between decoupled ports ranges between 20 and 40 db; in general is not the same between various isolated ports, nor is the isolation necessarily the same ia opposite directions between any two isolated ports. A broadband differential phase shift circulator for X-band, rated at 100 kw peak pulse power, is shown in Fig. 10-34. Fig. 10-33 Anisotropic Transmission Line Using a Circulator. Transmission Properties from 1 to 3 and from 3 to 1 Can Be Independently Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Povejsil, Donald J. Princeton, N. J. , Van Nostrand
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