US3336542A - Tunable coaxial cavity resonator - Google Patents

Tunable coaxial cavity resonator Download PDF

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Publication number
US3336542A
US3336542A US484973A US48497365A US3336542A US 3336542 A US3336542 A US 3336542A US 484973 A US484973 A US 484973A US 48497365 A US48497365 A US 48497365A US 3336542 A US3336542 A US 3336542A
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Prior art keywords
cup
cavity resonator
tunable
coaxial
coaxial cavity
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Expired - Lifetime
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US484973A
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Kenneth E Hancock
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CMC Electronics Inc
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Canadian Marconi Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/06—Cavity resonators

Definitions

  • a reduction in the length of coaxial cavities which are tuned over a range of frequencies by adjustment of the length of the inner conductor can be achieved by fixing a capacity loading cup coaxially on that end wall opposite the wall supporting the inner conductor.
  • the loading cup cylindrical in configuration, has an inner diameter somewhat larger than the free end of the coaxial inner conductor. In tuning the device the inner conductor penetrates beyond the lips of the cup member, and in advancing increasingly loads the inner conductor with end capacity.
  • a tunable coaxial resonator of the type wherein the free end of the coaxial inner conductor is adjustable axially to enter within the confines of a cylindrical cup-shaped capacity loading member is characterised in that the wall of said cup-shaped member is provided with a pair of diametrically opposite semi-circular cut-outs the radius of which is subsantially the same as the inner radius of said cup-shaped member and whose centres lie in the plane of the cup rim.
  • FIGURE 1 shows in cross-section a tunable coaxial cavity resonator in accordance with the invention.
  • FIGURE 2 shows the tuning laws of a resonator in ac cordance with the invention as compared with that of a prior art cavity.
  • FIGURE 1 there is shown a tunable coaxial cavity resonator comprising the known construction of a cylinder 1, end walls 2 and 3, a fixed section of coaxial inner conductor 4, an axially moveable inner conductor section 5 with actuating means such as screw 6, and a capacity loading cup 7.
  • the cup 7 is provided with two diametrically opposite semi-circular cut-outs, one of which, 8, is visible in FIGURE 1.
  • the cut-outs have a radius which is substantially the same as that of the inner radius of cup 7, and are oriented such that their centres lie on a common diameter in the plane of the cup rim.
  • FIGURE 2 is shown the tuning law for such a cavity with and without the cut-outs 8. It will be seen that by the use of cut-outs 8 in accordance with the invention a substantial improvement in the linearity of the tuning law is achieved.
  • a tunable coaxial resonator of the type wherein the free end of the coaxial inner conductor is adjustable axially to enter within the confines of a cylindrical cupshaped capacity loading member is characterised in that the wall of said cup-shaped member is provided with a pair of diametrically opposite semi-circular cut-outs the radius of which is substantially the same as the inner radius of said cup-shaped member and whose centres lie in the plane of the cup rim.

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Description

Aug. 15, 1967 K. E. HANCOCK 3,336,542
TUNABLE COAXIAL CAVITY RESONATOR Filed Sept. 5, 1965 2 Sheets-Sheet 1 LV/,/////////////////A INVENTOR K. E. HANCOCK ATTORNEYS Aug. 15, 1967 K. E. HANCOCK 3,336,542
TUNABLE. COAXIAL CAVITY RESONATOR Filed Sept. 3, 1965 2 Sheets-Sheet 2 CYLINDR ICAL CQP MODIFIED CUP RETRACTION FREQUENCY 9 FIG. 2
INVENTOR K. E. HANCOCK A TTORNEYS United States Patent 3,336,542 TUNABLE CUAXIAL CAVITY RESONATOR Kenneth E. Hancock, Roxboro, Quebec, Canada, assignor to Canadian Marconi Company, Montreal, Quebec, Canada Filed Sept. 3, 1965, Ser. No. 484,973 1 Claim. (Cl. 33382) This invention is concerned with tunable cavity resonators and is particularly directed to cavities of the coaxial type having capacity loading.
A reduction in the length of coaxial cavities which are tuned over a range of frequencies by adjustment of the length of the inner conductor can be achieved by fixing a capacity loading cup coaxially on that end wall opposite the wall supporting the inner conductor. The loading cup, cylindrical in configuration, has an inner diameter somewhat larger than the free end of the coaxial inner conductor. In tuning the device the inner conductor penetrates beyond the lips of the cup member, and in advancing increasingly loads the inner conductor with end capacity.
The above-described arrangement has the disadvantage in some applications that the change of frequency obtained is a quite non-linear function of the axial displacement of the inner conductor. It is an aim of this invention to substantially reduce this non-linearity.
According to the invention a tunable coaxial resonator of the type wherein the free end of the coaxial inner conductor is adjustable axially to enter within the confines of a cylindrical cup-shaped capacity loading member is characterised in that the wall of said cup-shaped member is provided with a pair of diametrically opposite semi-circular cut-outs the radius of which is subsantially the same as the inner radius of said cup-shaped member and whose centres lie in the plane of the cup rim.
The invention will be more particularly described with reference to the accompanying drawings in which:
FIGURE 1 shows in cross-section a tunable coaxial cavity resonator in accordance with the invention; and
FIGURE 2 shows the tuning laws of a resonator in ac cordance with the invention as compared with that of a prior art cavity.
Referring to FIGURE 1 there is shown a tunable coaxial cavity resonator comprising the known construction of a cylinder 1, end walls 2 and 3, a fixed section of coaxial inner conductor 4, an axially moveable inner conductor section 5 with actuating means such as screw 6, and a capacity loading cup 7. In accordance with the invention the cup 7 is provided with two diametrically opposite semi-circular cut-outs, one of which, 8, is visible in FIGURE 1. As is shown, the cut-outs have a radius which is substantially the same as that of the inner radius of cup 7, and are oriented such that their centres lie on a common diameter in the plane of the cup rim.
In FIGURE 2 is shown the tuning law for such a cavity with and without the cut-outs 8. It will be seen that by the use of cut-outs 8 in accordance with the invention a substantial improvement in the linearity of the tuning law is achieved.
I claim:
A tunable coaxial resonator of the type wherein the free end of the coaxial inner conductor is adjustable axially to enter within the confines of a cylindrical cupshaped capacity loading member is characterised in that the wall of said cup-shaped member is provided with a pair of diametrically opposite semi-circular cut-outs the radius of which is substantially the same as the inner radius of said cup-shaped member and whose centres lie in the plane of the cup rim.
No references cited.
ELI LIEBERMAN, Primary Examiner. L. ALLAHUT, Assistant Examiner.
US484973A 1965-09-03 1965-09-03 Tunable coaxial cavity resonator Expired - Lifetime US3336542A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477783A1 (en) * 1980-03-04 1981-09-11 Thomson Csf VARIABLE CAPABILITY ADAPTER DEVICE AND TUNABLE HYPERFREQUENCY FILTER HAVING AT LEAST ONE SUCH DEVICE
US20100073111A1 (en) * 2007-01-15 2010-03-25 Nicholas Archer Tem mode resonator
US20100283558A1 (en) * 2007-04-30 2010-11-11 Andrew James Panks temperature compensated tuneable tem mode resonator
US9041496B2 (en) 2011-06-08 2015-05-26 Intel Corporation Adjustable resonator
WO2016174422A3 (en) * 2015-04-28 2017-01-05 David Rhodes A tuneable tem mode microwave resonator and a tuneable microwave filter
WO2018078329A1 (en) * 2016-10-25 2018-05-03 Isotek Microwave Limited A tuneable microwave filter and a tuneable microwave multiplexer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477783A1 (en) * 1980-03-04 1981-09-11 Thomson Csf VARIABLE CAPABILITY ADAPTER DEVICE AND TUNABLE HYPERFREQUENCY FILTER HAVING AT LEAST ONE SUCH DEVICE
US4380747A (en) * 1980-03-04 1983-04-19 Thomson-Csf Tunable ultra-high frequency filter with variable capacitance tuning devices
EP0035922B1 (en) * 1980-03-04 1984-06-20 Thomson-Csf Tuning device with variable capacity and tunable microwave filter with at least one such device
US20100073111A1 (en) * 2007-01-15 2010-03-25 Nicholas Archer Tem mode resonator
US20100283558A1 (en) * 2007-04-30 2010-11-11 Andrew James Panks temperature compensated tuneable tem mode resonator
US9041496B2 (en) 2011-06-08 2015-05-26 Intel Corporation Adjustable resonator
WO2016174422A3 (en) * 2015-04-28 2017-01-05 David Rhodes A tuneable tem mode microwave resonator and a tuneable microwave filter
WO2018078329A1 (en) * 2016-10-25 2018-05-03 Isotek Microwave Limited A tuneable microwave filter and a tuneable microwave multiplexer
GB2555407B (en) * 2016-10-25 2021-12-15 Isotek Microwave Ltd A tuneable microwave filter and tuneable microwave multiplexer

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