US4259743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmit/receive microwave circuit
Assignee: Hitachi Ltd
•
Filing: 1978-12-01
•
Granted: 1981-03-31
•
Expires: 1998-12-01
Abstract
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.
Inventors
- 👤 Yoichi Kaneko
- 👤 Kenji Sekine
- 👤 Eiichi Hase
- 👤 Akira Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
H; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03D9/0641; G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/60; G01S7/00; G01S7/02; G01S7/03; G01S7/032; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/147; H03D7/00; H03D7/14; H03D7/1408; H03D9/02; H03D9/0616
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
157 words
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.
Claim 2
Dependent Claim
157 words
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.
Claim 3
Dependent Claim
84 words
A microwave circuit device according to claim 1, wherein a front surface of said microwave integrated circuit plate, on which said mixer diodes are mounted, faces said short-circuit plate of said waveguide, the rear surface of said circuit plate faces the opening of the waveguide, and a portion of said rear surface corresponding to a respective one of said mixer diodes and said lead line connected between said oscillation part and said connecting point of the mixer diode is made of a dielectric material.
Claim 4
Dependent Claim
29 words
A microwave circuit device according to claim 2, wherein a screw for controlling a balance of electric fields applied to said mixer diodes is mounted on said short-circuit plate.
Claim 5
Dependent Claim
34 words
A microwave circuit device according to claim 1, wherein said microwave integrated circuit plate is mounted in such a position that a plane of said plate is parallel with an axis of said waveguide.
Claim 6
Dependent Claim
34 words
A microwave circuit device according to claim 4, wherein said device further comprises at least one screw which is arranged in parallel with the microwave integrated plate through a side wall of the waveguide.
References Cited (Backward Citations)
US2832885A
Cited
US3066290A
Cited
US3512091A
Cited
US3768025A
Cited
US3882396A
Cited
US4122449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |