US2954536A - Capacitively coupled cavity resonator - Google Patents

Capacitively coupled cavity resonator Download PDF

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Publication number
US2954536A
US2954536A US700498A US70049857A US2954536A US 2954536 A US2954536 A US 2954536A US 700498 A US700498 A US 700498A US 70049857 A US70049857 A US 70049857A US 2954536 A US2954536 A US 2954536A
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United States
Prior art keywords
coupling
resonator
waveguide
resonators
cavity resonator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US700498A
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English (en)
Inventor
Muller Martin
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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Publication of US2954536A publication Critical patent/US2954536A/en
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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

  • the invention is aimed at reaching the advantages of a capacitive H-field coupling of cavity resonators preferably with rectangular waveguides by avoiding the aforementioned disadvantages.
  • the inside space of preferably a rectangular waveguide, that is connected to the cavity resonator, is terminated by a capacity which is arranged between the two broad side wall of the said waveguide, so that the spacial dimensions of this capacity substan- 2,954,536 Patented Sept.
  • an .so tha t e adjo ng ty r s n o i o tiled via t is c pa i y by y of a c rr n o H-cou: a as- An advan eous further e b e of t int/en: t n c ists n th a a coupli c pa i y i the i s d space of the wayeguide there serves a conductive rod arranged parallel with the broader side Walls a there.- pf, and that between these side walls and the vconductive rod there is respectively formed a slot-like coupling gap of the length a.
  • One possibile form of a resonator in which the width a .of the connecting waveguide is maintained, is the regular cylindrical E -resonator of the same cylinder height, which is being excited from a generating line.
  • a tunable coupling can be accomplished in that the circular cross-section of the conductive rod is flattened on one or two sides, so that the coupling gaps will have a width that may be varied by turning the cylinder.
  • the coupling rod can be inserted from the outside.
  • the bandwidth and the transmission ratio of the resonator can thus also be varied within wide limits .in that the coupling rod is capable of being interchanged at will.
  • Capacitively coupled cavity resonators according to the invention are especially suited to the purpose of manufacturing frequency filters in that either corresponding previously balanced resonators, by the interconnection of waveguide pieces, are connected to form a lambdaquarter-coupled filter, or that cavity resonators, directly adjoining the coupling capacity, are combined to form 9. directly coupled multi-circuit filter.
  • Fig. 1 in a longitudinal section, shows a cavity resonator 1 with a tuning stamp 2 and the connected rectangular waveguides 3 and 4.
  • the cavity is designed as an oval H -resonator. This shape has proved to be particularly flavourable for both the manufacture of the casting and the necessary surface processing.
  • the reference numerals 5 and 6 in the drawing denote the coupling rods, which according to the invention, are arranged freely in respectively each a boring that somewhat expands the waveguide.
  • the rod or bar 6 is some.- what flattened on one side, so that, by turning it within the boring, the width of the gap can be varied at least on-one side within certain limits.
  • FIG. 1 illustrates a sectional view taken along lines A-A of Fig. 1. This figure illustrates the position of coupling rods 6 in rectangular waveguide 4. Letters a and b represent the width and height respectively of waveguide 4.
  • a multi-cavity filter from a number of resonators, which are directly coupled with one another, as is shown in Fig. 2 in the form of a three-section filter, wherein 1 denotes the three cavities of the same type, which are designed in this example-as H -rectangular resonators.
  • Reference numeral 2 indicates the tuning screws (also termed screw stamps or tuning stamps hereinbefore), 3 the coupling cylinders (or rods) which, if so required, may have different diameters, and 4 the connecting waveguides.
  • a filter of this type is widely tunable without any noteworthy change of the bandwidth and of the transmission properties. It further bears the added advantage of having a substantially frequency-independent length, because between the individual cavity resonators there are arranged no line sections or pieces, the length of which would have to be tuned or matched.
  • An arrangement 'for coupling the rectangular waveguide, having walls of major and minor dimensions to a cavity resonator, having apertures therein substantially equal to'the major dimension of said waveguide comprising means vforconnecting the walls of said waveguide to said resonator about said aperture, and a rod extending across the entire width of said waveguide across its major dimension adjacent said aperture.
  • said means comprises extensions of said waveguide walls of said major dimensions enlarged with respect to the normal wall, said rod being mounted in said enlarged region.

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US700498A 1956-12-06 1957-12-03 Capacitively coupled cavity resonator Expired - Lifetime US2954536A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL26375A DE1046128B (de) 1956-12-06 1956-12-06 Kapazitiv gekoppelter Hohlraumresonator

Publications (1)

Publication Number Publication Date
US2954536A true US2954536A (en) 1960-09-27

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ID=7263768

Family Applications (1)

Application Number Title Priority Date Filing Date
US700498A Expired - Lifetime US2954536A (en) 1956-12-06 1957-12-03 Capacitively coupled cavity resonator

Country Status (4)

Country Link
US (1) US2954536A (de)
BE (1) BE576647A (de)
CH (1) CH360427A (de)
DE (1) DE1046128B (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289113A (en) * 1963-03-21 1966-11-29 Comp Generale Electricite Non-reciprocal attenuation equalization network using circulator having plural mismatched ports between input and output port
US3789325A (en) * 1971-11-24 1974-01-29 Itt Variable frequency and coupling equalizer and method for tuning
US3899759A (en) * 1974-04-08 1975-08-12 Microwave Ass Electric wave resonators
US4034319A (en) * 1976-05-10 1977-07-05 Trw Inc. Coupled bar microwave bandpass filter
US5777534A (en) * 1996-11-27 1998-07-07 L-3 Communications Narda Microwave West Inductor ring for providing tuning and coupling in a microwave dielectric resonator filter
US5781085A (en) * 1996-11-27 1998-07-14 L-3 Communications Narda Microwave West Polarity reversal network

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8302439A (nl) * 1983-07-08 1985-02-01 Philips Nv Werkwijze voor het vervaardigen van een golfgeleiderfilter, alsmede een golfgeleiderfilter vervaardigd volgens die werkwijze.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network
US2530679A (en) * 1948-12-23 1950-11-21 Bell Telephone Labor Inc Resonant impedance branch
US2626990A (en) * 1948-05-04 1953-01-27 Bell Telephone Labor Inc Guided wave frequency range transducer
US2649576A (en) * 1949-10-07 1953-08-18 Bell Telephone Labor Inc Pseudohybrid microwave device
US2749523A (en) * 1951-12-01 1956-06-05 Itt Band pass filters

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629015A (en) * 1949-06-28 1953-02-17 Raytheon Mfg Co Electromagnetic wave filtering device
IT500027A (de) * 1951-12-04 1900-01-01 Telefunken Gmbh
CH305548A (de) * 1952-09-09 1955-02-28 Standard Telephon & Radio Ag Hohlleiter-Bandpassfilter für Mikrowellen.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network
US2626990A (en) * 1948-05-04 1953-01-27 Bell Telephone Labor Inc Guided wave frequency range transducer
US2530679A (en) * 1948-12-23 1950-11-21 Bell Telephone Labor Inc Resonant impedance branch
US2649576A (en) * 1949-10-07 1953-08-18 Bell Telephone Labor Inc Pseudohybrid microwave device
US2749523A (en) * 1951-12-01 1956-06-05 Itt Band pass filters

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289113A (en) * 1963-03-21 1966-11-29 Comp Generale Electricite Non-reciprocal attenuation equalization network using circulator having plural mismatched ports between input and output port
US3789325A (en) * 1971-11-24 1974-01-29 Itt Variable frequency and coupling equalizer and method for tuning
US3899759A (en) * 1974-04-08 1975-08-12 Microwave Ass Electric wave resonators
US4034319A (en) * 1976-05-10 1977-07-05 Trw Inc. Coupled bar microwave bandpass filter
US5777534A (en) * 1996-11-27 1998-07-07 L-3 Communications Narda Microwave West Inductor ring for providing tuning and coupling in a microwave dielectric resonator filter
US5781085A (en) * 1996-11-27 1998-07-14 L-3 Communications Narda Microwave West Polarity reversal network

Also Published As

Publication number Publication date
BE576647A (nl) 1959-09-14
CH360427A (de) 1962-02-28
DE1046128B (de) 1958-12-11

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