Microwave 180.degree. phase-bit device with integral loop transition
AssigneeInternational Telephone and Telegraph Corporation
InventorsJeffrey T. Nemit, Bobby J. Sanders
Life of this patent
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Abstract
A 180.degree. microwave phase-bit device implemented in a stripline medium with integral transitional coupling into a waveguide by means of an H plane loop within the waveguide. The device is particularly well suited for use in digital diode phase shifters attached to waveguide feed networks, such as in the case of corporate feed of plural antenna elements within a phased array. The device is shown both independently and in connection with diode phase shifters providing intermediate values of phase shift such as 22.degree., 45.degree. and 90.degree.. PIN type radio frequency diodes would normally be used to provide the necessary switching function.
Claims10
An integral device including a 180.degree. selective microwave phase bit device and transitional coupling operative between waveguide and a second transmission line medium, comprising:
- a conductive loop in a plane orthogonal with respect to the longitudinal axis of said waveguide, said plane being located to place said loop within said waveguide to provide magnetic coupling between said loop and the energy within said waveguide;
- said loop being connected to provide a first port for said device;
- means providing a second port in said second transmission line medium, said phase bit device being operatively connected between said first and second ports;
- at least a first control terminal for receiving at least a first control signal;
- and a microwave energy switching arrangement within said phase shifter, responsive to said first control signal to establish a first direction of current flow in said loop in response to the microwave signal at said second port for a first condition of said control signal and a second direction of current flow in said loop for a second condition of said control signal.
An integrated, microwave, 180.degree. phase-bit device in a stripline medium with integral transition to a waveguide transmission line, comprising:
- first and second branches in the plane of, and connected to the central strip conductor within said stripline, to form a reciprocal power divider;
- first stripline circuit means including first and second radio frequency diodes each being controllable to provide conducting and alternate non-conducting conditions as a function of the condition of a switching control, signals applied thereto to effect a radio frequency connection from one of said branches to said central strip conductor, one of said diodes being controlled in said conducting condition while the other is contemporaneously controlled in said non-conducting condition;
- a conductive loop in said plane of said central strip conductor, said loop extending into the end of said waveguide to provide H plane coupling thereto;
- and second stripline means for connecting the terminals of said loop, one to each of said branches, to produce zero and 180.degree. current flow in said loop alternatively in accordance with the alternative conditions of said switching control signals.
Dependencies are inferred from the claim text.