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US3733567A Expired / Lapsed US ⏱️ 0.0 years remaining

Coaxial cavity resonator with separate controls for frequency tuning and for temperature coefficient of resonant frequency adjustment

Assignee: Minister of Aviation
•
Filing: 1971-04-13
•
Granted: 1973-05-15
•
Expires: 1991-04-13
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Abstract

Abstract A temperature compensated tuning apparatus for a co-axial resonant cavity comprises a telescopic tuning member having a first section and a second section, the sections having different co-efficients of thermal expansion and being connected by a coefficient of expansion adjusting screw which has an internally threaded bore engaged with the first section and an externally threaded part engaged with the second section; a capacitive disc mounted co-axially on the end of the first section within the cavity is maintained in electrical contact with the second section by means of resilient contact members while permitting a telescopic relative motion of the first section with respect to the second section. The first member is made of an alloy of 36 percent nickel and 64 percent iron while the second member and the co-efficient expansion screw are made of brass or copper. The arrangement provides a cavity having an adjustable positive thermal co-efficient of resonant frequency which is useful for compensating for the negative co-efficient of frequency of a Gunn diode oscillator.

Inventors

  • 👤 A Johnson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 12:27
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 164 words
A coaxial cavity resonator incorporating a telescopic inner conductor which comprises, a tubular tuning screw having an external thread engaged with the structure of one end of the resonator, and having an internally threaded bore, a temperature-coefficient adjusting screw having external and internal threads of substantially the same pitch, the external thread being engaged and cooperating with the internal thread of the bore of the said tubular tuning screw, a stem having an external thread engaged and cooperating with the internal thread on the said temperature coefficient adjusting screw, said stem being formed of a material having a coefficient of thermal expansion different from the coefficient of thermal expansion of the material of the said tuning screw, a plunger mounted on said stem so as to form a tuning capacitance with the structure of the resonator which capacitance can be varied by adjusting the said tuning screw, and means for preventing relative rotation of the sAid stem with respect to the said tuning screw.
Claim 2
Dependent Claim 164 words
A coaxial cavity resonator incorporating a telescopic inner conductor which comprises, a tubular tuning screw having an external thread engaged with the structure of one end of the resonator, and having an internally threaded bore, a temperature-coefficient adjusting screw having external and internal threads of substantially the same pitch, the external thread being engaged and cooperating with the internal thread of the bore of the said tubular tuning screw, a stem having an external thread engaged and cooperating with the internal thread on the said temperature coefficient adjusting screw, said stem being formed of a material having a coefficient of thermal expansion different from the coefficient of thermal expansion of the material of the said tuning screw, a plunger mounted on said stem so as to form a tuning capacitance with the structure of the resonator which capacitance can be varied by adjusting the said tuning screw, and means for preventing relative rotation of the sAid stem with respect to the said tuning screw.
Claim 3
Dependent Claim 66 words
A coaxial cavity resonator incorporating a telescopic inner conductor as claimed in claim 1, and further including a cylindrical post axially aligned with the said inner conductor and having one end thereof attached to the structure of the said resonator, the other end of said cylindrical post forming the main capacitative component of the said resonator in conjunction with said plunger of the said inner conductor.
Claim 4
Dependent Claim 34 words
A coaxial cavity resonator as claimed in claim 2 wherein the said telescopic inner conductor also comprises a contacting means located and making electrical contact between the said plunger and the said tuning screw.
Claim 5
Dependent Claim 50 words
A coaxial cavity resonator as claimed in claim 3 wherein the contacting means comprises two sets of resilient fingers formed on a single metallic member and mounted so that one of the sets makes electrical contacts with the plunger while the other set makes electrical contacts with the tuning screw.

References Cited (Backward Citations)

US2124029A Cited
US2109880A Cited
US2173908A Cited
US2205851A Cited
US2533912A Cited
US2637782A Cited
US2716222A Cited
CH333746A Cited
US3160825A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-05-14 1976-11-13 1977-05-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-05-14 1980-11-13 1981-05-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-05-14 1984-11-13 1985-05-15 $7700.00 Window Closed / Lapsed

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