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US 4,259,743 AGranted
Transmit/receive microwave circuit
AssigneeHitachi, Ltd.
InventorsYoichi Kaneko, Kenji Sekine, Eiichi Hase, Akira Endo
Life of this patent
Estimating the term…
Abstract
A microwave integrated circuit device for use in the transmitting and receiving portion of a Doppler speedometer utilizing microwaves. In order to keep the transmitting power low and the receiving sensibility high, a microwave integrated circuit plate in which a transmitting antenna line and lines for connecting mixer diodes therewith are arranged at right angles is mounted within a rectangular waveguide and in the vicinity of a short-circuit plate of the waveguide in a manner to lie at right angles with the electric field of the waveguide.
Claims5
A transmit/receive microwave circuit device comprising:
- a rectangular waveguide with an opening at one end thereof and a short-circuit plate at a second end thereof and propagating a singly polarized electric field;
- a microwave integrated circuit plate on which two mixer diodes and lead lines connected to said diodes are collinearly arranged and which a lead line connected between an oscillation signal part and a connecting point of said two mixer diodes is arranged at a right angle to said two mixer diodes collinearly arranged,
- and said microwave integrated circuit plate is installed at said second end end of said waveguide in such a manner that said lead line connected between the oscillation signal part and said connecting point of said mixer diodes is at a right angle to a direction of said electric field and that said mixer diodes and their lines collinearly arranged are parallel to the direction of said electric field in said waveguide.
Dependencies are inferred from the claim text.