US3777286A - Die cast waveguide low pass filter - Google Patents

Die cast waveguide low pass filter Download PDF

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US3777286A
US3777286A US00278667A US3777286DA US3777286A US 3777286 A US3777286 A US 3777286A US 00278667 A US00278667 A US 00278667A US 3777286D A US3777286D A US 3777286DA US 3777286 A US3777286 A US 3777286A
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section
waveguide
wall
conductive teeth
filter
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US00278667A
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H Cramm
C Gorby
J Leetmaa
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Raytheon Co
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Hughes Aircraft Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/207—Hollow waveguide filters
    • H01P1/211—Waffle-iron filters; Corrugated structures

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  • the filter utilizes die cast con- 7 struction techniques and cast-in dowel holes for di- [52] US. 333/98 M mensional fidelity, close tolerances and precise align- [5 l] l-l0 3h 7/10, H03h 9/00 333/70 S, 333/73 W Int. ment.
  • the filter uses fewer parts than previous devices [58] Field of Search................ 333/73, 73 W, 98 M, and an be easily assembled without the use of jigs,
  • waffleiron filters have beencassembled from no fewer 'than four separate pieces, each havingibeen-"previously machined.
  • thermore the'modified structures tendto be somewhat larger and more complicated than the basic-filter.
  • die casbconstruction techniques provide muchff'lowerm'anufacturingi-costs, improved dimensional'fidelity,close tolerances, fine'det'ail,” smooth finish'esy-little'orno machin'ing'for'assembly sets and exact part to-part”duplication; all'of whichj'are required to produce high quality waffle iron filters.
  • FlG. 1 is apictorialview of one of the mating halves of a waffleiron'filter accordingto the present 'inventron;
  • FIG. 2 isa-longitudinalcross-sectionof the assembled'filter in'somewhat modified form
  • FIG. 1 is a pictorial view *of' oneof the mating halves of a preferred embodiment of the present invention.
  • the part flanges l4 and 15 are lapped, machined or sanded to a smooth flat finish and preferably plated prior to assembly to provide a high conductivity substantially loss-free joint.
  • dowel pin alignment holes 16 are provided in flanges 14 and 15.
  • Tapped screw holes 17 also extend through these flanges to receive machine screws which provide the necessary clamping force to maintain the integrity of the assembled structure.
  • the internal construction of the waffle iron filter of the present invention can be readily seen in the pictorial view of FIG. 1. Again it is to be noted that an identical mating half is required to complete the assembled filter.
  • the die cast body of FIG. 1 comprises three serially disposed sections. Proceeding from waveguide flange 11 there is shown an input impedance matching section 18, a centrally disposed filter section 19 and an output impedance matching section 20.
  • the design of the waffle iron section 19 and impedance matching sections 18 and 20 are well-known in the art. See, for example, US. Pat. No. 3,046,503 mentioned hereinabove, and an article by Young and Shiffman entitled New and Improved Types of Waffle-Iron Filters, Proc. IEE (London), Vol. 110, pp. 1191 et seq., July 1963.
  • the design of the waffle iron filter of the present invention departs from the design dictated by the prior art and by traditional microwave engineering practice.
  • a taper is employed in the waveguide sidewalls as indicated by the angle a.
  • the taper is sufficiently large to allow the die to be removed from the body 10 during the casting process without surface abrasion.
  • the taper (usually referred to as draft) of the waveguide wall, of course, results in a non-rectangular waveguide crosssection.
  • draft angle a By utilizing a taper or draft angle a on the order of from one-half to two degrees, it has been found that a part such as body 10 can be die cast of zinc alloy, for example, with no discernable surface irregumatching section 18 broken away.
  • FIGS. 2 and 3 taken together illustrate the frustro-pyramidal shaped teeth of 29 and 29' of the lower and upper mating halves of the improved waffle .iron filter.
  • the irregular hexagon cross-section of the waveguide formed by bodies 10 and 11 is illustrated in FIG. 3.
  • Zinc Alloy No. 3 has the following composition:
  • the parts After casting the parts are first trimmed to remove V the burrs and runners and are then sanded or machined larities caused by die removal. Additionally, it has been found that such a small departure from the optimum rectangular waveguide cross-section has no discernable adverse effect upon the electrical properties of the filter structure. In effect, the taper is so small that the resulting waveguide, although not of rectangular crossmodified tooth construction is illustrated in the views of FIGS. 2 and 3. Where appropriate, like reference numerals have been carried over from FIG. 1 to designate like structural elements. In addition, the primed reference numerals designate the corresponding elements of the mated upper half of the assembled filter structure.
  • FIG. .2 is a longitudinal cross-sectional view of as assembled waffle iron filter according to the present invention.
  • FIG. 3 there is shown an end view of the assembled filter with a portion of the input impedance to obtain the desired flatness of the mating surfaces.
  • the finished castings are then plated with a high conductivity material such as silver. by processes wellknown in the art.
  • the bodies are then mated with the aid of steel dowel pins and machine screws as shown in FIGS. 2 and 3.
  • a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said teeth are in the shape of frustra of right rectangular pyramids.
  • a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said conductive teeth are in the shape of frustra of right rectangular pyramids.
  • An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, and
  • said waveguide section includes first and second stepped impedance matching sections longitudinally disposed on either side of said pluralities of conductive teeth, the improvement comprising:
  • a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said conductive teeth are in the shape of frustra of right rectangular pyramids.

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Abstract

A microwave low pass filter of the so-called ''''waffle iron'''' type is disclosed. The filter utilizes die cast construction techniques and cast-in dowel holes for dimensional fidelity, close tolerances and precise alignment. The filter uses fewer parts than previous devices and can be easily assembled without the use of jigs, fixtures or special bonding techniques. Die cast construction techniques are made possible in the filter design by departing from the optimum electrical design of such components.

Description

n1] 3,777,286 14 1 Dec. 4, 1973 United States Patent v Cramm et al.
[54] I CAST WAVEGUIDE LOW PASS FILTER 3,205,462 9/1965 Meinke 333/98 M [75] Inventors: Herman W. Cramm, Rolling Hills 333/98 M 9/l966 333/73 R 3,546,635 8/1968 Quine et al....
Estates; Clifford L. Gorby,
Englewood; Juri G. Leetmaa, Los Angeles, all of Calif.
Assignee: Hughes Aircraft Company, Culver Primary Examiner-Rudolph V. Rolinec Assistant Examiner-Saxfield Chatmon, Jr. Attorney- W. H. MacAllister et al.
City, Calif.
57 ABSTRACT A microwave 'low pass filter of the so-called waffle Aug. 7, 1972 Appl. No.2 278,667
[22] Filed:
iron" type is disclosed. The filter utilizes die cast con- 7 struction techniques and cast-in dowel holes for di- [52] US. 333/98 M mensional fidelity, close tolerances and precise align- [5 l] l-l0 3h 7/10, H03h 9/00 333/70 S, 333/73 W Int. ment. The filter uses fewer parts than previous devices [58] Field of Search................ 333/73, 73 W, 98 M, and an be easily assembled without the use of jigs,
' fixtures or special bonding techniques. Die cast construction techniques are made possible in the filter design by departing from the optimum electrical design of such components.
[5 6] References Cited UNITED STATES PATENTS 3,046,503 7/l962 333 73 w 6 Claims, 3 Drawing Figures DIE CAST WAVEGUIDE LOW-PASS -F-lLTER i FIELD'OF. THE INVENTION This invention relates to microwavefilters-and morev specifically to microwavelow pass filters of-the waffl'e" iron type.
DESCRlPTlON OF' THE PRlOR 'ART' In the past, the more; complex'microwave devices have been fabricated according to the time-honored traditions'of-the precision machine shop: Certainly,
with the more complex-and. physically intricate structures the-only practical way to obtain devices of the required dimensional. tolerances has been by precision machining. According .to these-techniques waffleiron filters have beencassembled from no fewer 'than four separate pieces, each havingibeen-"previously machined.
of block stock brass or other material;
As is well-known, microwave filtersof the'waffle'iron type generally comprise two identical sections of block" material, each. having: transverse and longitudinal rooves machined therein tocreatea'm'atrix of raised bosses or teeth. These two sections of raised teeth are then aligned and=assembled so-that the=teeth-of each section are identically aligned withth'ose of th'e other sections in the manner ofa household waffle iron.
Apair of sidewallsare provided to createa hollow conductively bounded structure.- Typicalstructures of the prior art type-are illustrated in;U.S."Pat."No.3,046-,503
which issued on July 24,- 1962 to S.'B; Cohn.
In addition to the waffl e'iron'sections and conductive sidewalls, other parts, including=.impedance-matching'- sections and endflanges are requiredfor the complete filter structure.-
The main source of difficulty'withsuch devices ori'giynates in-the assembly PI'OCCSSuNOt only must'each sepa-' rate waffle iron sectionbe-checked for dimensional ac curacybut also they-must be precisely alignedat the time of assembly. If the teethofthe-assembled structure are not precisely -.aligned,'especially in the transversedirectionundersirable spurious modes are generatedduring the operation-of the device: These spurious modes in turn cause severedegradation of the electri-- cal performance of the filter.
Proposals to modifythe basic'waffl'e' iron design to attenuate the spurious modes which are generated have' been made. Such-modified'structures are'disclosed in US. Pat. No. 3,271,706 which issued on Sept. 6, 1966 to]. P. Rooney. Such remedies, however, donot pre-' vent the-generation of spurious modes, butrather tend" to eliminate them only after they are generated. Fur
thermore, the'modified structures tendto be somewhat larger and more complicated than the basic-filter.
It is an object of the-present invention toprovide a microwave waffle iron filter 'of simplified construction:
2fmodifyingtheiphysical design'vof thevdie cast part. The difficulty in so doing: results' from the fact well-known in the microwave deviceart that a modification of the physical design invariably results in a modification of the electrical-perfonnancee Theproblem, therefore,
becomes one of designinga microwave component not only from "considerations of *electricaland mechanical behavior but also by considerationsdictated by the die castingaart.
It is another-object of the present invention, therefore, to modify-the design'of waffle iron filters to accommodate diecast fabrication'techniques without adversely affecting their electrical properties.
SUMMARY OF THE INVENTION In keeping-with the'principles of the present invention,*- th'e"se objects are'accomplished by modifying the design of the waffleironfilter to accommodate die-cast construction techniques. Such'modifications for example; includ'split sidewalls'with'integral flanges having cast-in dowel pin'aligning holes and screw'h'oles. Additionally, the-design departs from the previously employed rectangular waveguide cross-sections and rectangularteeth by incorporating taperedwaveguide walls and taper'edsteethaAlthoughthe' modifications in design depart from the'theoretically optimum design, they result in'substantially no sacrifice in electrical performance.
In addition, die casbconstruction techniques provide muchff'lowerm'anufacturingi-costs, improved dimensional'fidelity,close tolerances, fine'det'ail," smooth finish'esy-little'orno machin'ing'for'assembly sets and exact part to-part"duplication; all'of whichj'are required to produce high quality waffle iron filters.-
It is another object ofthepresent"inventiont0prov videwaffle--ironfilters' havingfewer constituent parts:
Althoughit was proposed as -early as 4948mm certain microwave components were susceptible to die cast fabrication,- these-methods have not been 'widelyemployedzDie casting ,as properly employed is known to yield castings of clean, sharp'definition and close dimensional tolerances-(see:Ragam-Microwave Transmis-- sian Circuits, Vol. 9. Radn Lab." Series, McGraw-hill,
New York, l948, -p. 122).
The practical problems associated-with 'such methods, howevenfrequently can be overcome only by BRIEF-DESCRIPTION OF THE DRAWINGS Theabovemientionedandother features and objects of the present invention will become more apparent by reference -to 'thefollowing description taken in con- 'junction"-with*the' accompanying drawings in which:
FlG. 1 is apictorialview of one of the mating halves of a waffleiron'filter accordingto the present 'inventron;
FIG. 2 isa-longitudinalcross-sectionof the assembled'filter in'somewhat modified form; and
FIG. 3 is an=end view of the assembled filter particularly illustratingthe' non-rectangular waveguide crosssectionx DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring'more specifically to'the drawings, FIG. 1 is a pictorial view *of' oneof the mating halves of a preferred embodiment of the present invention. The part flanges l4 and 15 are lapped, machined or sanded to a smooth flat finish and preferably plated prior to assembly to provide a high conductivity substantially loss-free joint. To facilitate alignment of body with its mating upper half, dowel pin alignment holes 16 are provided in flanges 14 and 15. Tapped screw holes 17 also extend through these flanges to receive machine screws which provide the necessary clamping force to maintain the integrity of the assembled structure.
The internal construction of the waffle iron filter of the present invention can be readily seen in the pictorial view of FIG. 1. Again it is to be noted that an identical mating half is required to complete the assembled filter. The die cast body of FIG. 1 comprises three serially disposed sections. Proceeding from waveguide flange 11 there is shown an input impedance matching section 18, a centrally disposed filter section 19 and an output impedance matching section 20. The design of the waffle iron section 19 and impedance matching sections 18 and 20 are well-known in the art. See, for example, US. Pat. No. 3,046,503 mentioned hereinabove, and an article by Young and Shiffman entitled New and Improved Types of Waffle-Iron Filters, Proc. IEE (London), Vol. 110, pp. 1191 et seq., July 1963.
For the purpose of facilitating die cast construction techniques, the design of the waffle iron filter of the present invention departs from the design dictated by the prior art and by traditional microwave engineering practice.
A taper is employed in the waveguide sidewalls as indicated by the angle a. The taper is sufficiently large to allow the die to be removed from the body 10 during the casting process without surface abrasion. The taper (usually referred to as draft) of the waveguide wall, of course, results in a non-rectangular waveguide crosssection. By utilizing a taper or draft angle a on the order of from one-half to two degrees, it has been found that a part such as body 10 can be die cast of zinc alloy, for example, with no discernable surface irregumatching section 18 broken away. FIGS. 2 and 3 taken together illustrate the frustro-pyramidal shaped teeth of 29 and 29' of the lower and upper mating halves of the improved waffle .iron filter. In addition, the irregular hexagon cross-section of the waveguide formed by bodies 10 and 11 is illustrated in FIG. 3.
In addition to the draft or taper of the waveguide sidewalls and teeth 29 and 29 a similar taper has been designed into the integral flanges ll, 12 and 13 and 11', 12 and 13'. These tapers, although not affecting the electrical performance, are designed into the body to facilitate the die casting fabrication technique.
Although many different materials including alloys of aluminum, copper, lead, magnesium and tin can be successfully die cast, the most popular and widely used alloys are the alloys of zinc. A zinc alloy which has been successfully employed in the fabrication of the filters of the present invention is known in the trade as ZAMAK No. 3 (or alternatively Zinc Alloy No. 3).
Zinc Alloy No. 3 has the following composition:
Aluminum 3.5 4.3 percent Copper 0.25 percent maximum Magnesium 0.02 .05 percent Iron 0.10 percent Lead 0.005 percent maximum Cadmium 0.004 percent maximum Tin 0.003 percent maximum Zinc remainder It should be noted that the range of values one-half to two percent given for the taper angle 0: applies to magnesium and zinc alloys. In general, if the body is to be die cast of aluminum the taper angles should be increased to a range of approximately two to four degrees.
After casting the parts are first trimmed to remove V the burrs and runners and are then sanded or machined larities caused by die removal. Additionally, it has been found that such a small departure from the optimum rectangular waveguide cross-section has no discernable adverse effect upon the electrical properties of the filter structure. In effect, the taper is so small that the resulting waveguide, although not of rectangular crossmodified tooth construction is illustrated in the views of FIGS. 2 and 3. Where appropriate, like reference numerals have been carried over from FIG. 1 to designate like structural elements. In addition, the primed reference numerals designate the corresponding elements of the mated upper half of the assembled filter structure.
FIG. .2 is a longitudinal cross-sectional view of as assembled waffle iron filter according to the present invention. In FIG. 3 there is shown an end view of the assembled filter with a portion of the input impedance to obtain the desired flatness of the mating surfaces. The finished castings are then plated with a high conductivity material such as silver. by processes wellknown in the art. The bodies are then mated with the aid of steel dowel pins and machine screws as shown in FIGS. 2 and 3.
In all cases it is understood that the above-described embodiments are merely illustrative of but a small number of the many possible specific embodiments which can represent applications of the principles of the present invention. Numerous and varied other arrangements can be readily devices in accordance with these principles by those skilled in the art without departing from the spirit and-scope of the invention.
What is claimed is:
1. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a plurality of spaced conductive teeth extending from at least one wall thereof and wherein said teeth are arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvement comprising:
a waveguide cross-section which is in the shape of an waveguide section, respectively, the improvement comprising:
a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said teeth are in the shape of frustra of right rectangular pyramids.
3. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of said conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvement comprising:
a waveguide cross-section which is in the shape of an irregular hexagon.
4. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first'wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of said conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvement comprising:
a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said conductive teeth are in the shape of frustra of right rectangular pyramids.
5. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, and
wherein said waveguide section includes first and second stepped impedance matching sections longitudinally disposed on either side of said pluralities of conductive teeth, the improvement comprising:
a waveguide cross-section which is in the shape of an irregular hexagon. 6. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, and wherein said waveguide section includes first and second stepped impedance matching sections longitudinally disposed on either side of said pluralities of conductive teeth, the improvement comprising:
a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said conductive teeth are in the shape of frustra of right rectangular pyramids.

Claims (6)

1. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a plurality of spaced conductive teeth extending from at least one wall thereof and wherein said teeth are arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvement comprising: a waveguide cross-section which is in the shape of an irregular hexagon.
2. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a plurality of spaced conductive teeth extending from at least one wall thereof and wherein said teeth are arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvement comprising: a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said teeth are in the shape of frustra of right rectangular pyramids.
3. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of said conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvement comprising: a waveguide cross-section which is in the shape of an irregular hexagon.
4. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of said conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, the improvemEnt comprising: a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said conductive teeth are in the shape of frustra of right rectangular pyramids.
5. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, and wherein said waveguide section includes first and second stepped impedance matching sections longitudinally disposed on either side of said pluralities of conductive teeth, the improvement comprising: a waveguide cross-section which is in the shape of an irregular hexagon.
6. An improved microwave filter of the type wherein a hollow conductively bounded waveguide section is provided with a first plurality of spaced conductive teeth extending from a first wall thereof and a second plurality of spaced conductive teeth extending from a wall opposite said first wall, said first and second pluralities of conductive teeth being arranged in rows and columns which are parallel and transverse to the longitudinal axis of said waveguide section, respectively, and wherein said waveguide section includes first and second stepped impedance matching sections longitudinally disposed on either side of said pluralities of conductive teeth, the improvement comprising: a waveguide cross-section which is in the shape of an irregular hexagon, and wherein said conductive teeth are in the shape of frustra of right rectangular pyramids.
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602114A1 (en) * 1986-07-23 1988-01-29 Esswein Sa Microwave oven with harmonics-rejecting filter
EP1122808A1 (en) * 2000-01-31 2001-08-08 Hitachi, Ltd. High-frequency communication apparatus and method of manufacturing the same
FR2852739A1 (en) * 2003-03-20 2004-09-24 Thomson Licensing Sa Polarized wave separator for use in bidirectional transmission satellite, has two filters with one end coupled to respective slits and another end constituting respective individual input/output
US20100052823A1 (en) * 2008-08-29 2010-03-04 Azure Shine International Inc. Filter unit
CN101673862B (en) * 2008-09-09 2013-01-02 也翔国际股份有限公司 Satellite antenna equipment, transceiver module and filtering unit thereof
WO2020102543A1 (en) * 2018-11-14 2020-05-22 Optisys, LLC Hollow metal waveguides having irregular hexagonal cross-sections and methods of fabricating same
WO2020106774A1 (en) * 2018-11-19 2020-05-28 Optisys, LLC Irregular hexagon cross-sectioned hollow metal waveguide filters
US11996600B2 (en) 2018-11-14 2024-05-28 Optisys, Inc. Hollow metal waveguides having irregular hexagonal cross sections with specified interior angles
US12009596B2 (en) 2021-05-14 2024-06-11 Optisys, Inc. Planar monolithic combiner and multiplexer for antenna arrays
US12183963B2 (en) 2020-10-19 2024-12-31 Optisys, Inc. Device comprising a transition between a waveguide port and two or more coaxial waveguides
US12183970B2 (en) 2020-10-29 2024-12-31 Optisys, Inc. Integrated balancing radiating elements

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US3046503A (en) * 1960-05-27 1962-07-24 Seymour B Cohn Broad-band waveguide filter
US3205462A (en) * 1962-02-23 1965-09-07 Gen Electric Low-loss waveguide for propagation of h10 wave
US3271706A (en) * 1964-12-07 1966-09-06 Gen Electric Microwave filter
US3546635A (en) * 1968-08-13 1970-12-08 Us Air Force Waveguide mode selective absorber

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Publication number Priority date Publication date Assignee Title
US3046503A (en) * 1960-05-27 1962-07-24 Seymour B Cohn Broad-band waveguide filter
US3205462A (en) * 1962-02-23 1965-09-07 Gen Electric Low-loss waveguide for propagation of h10 wave
US3271706A (en) * 1964-12-07 1966-09-06 Gen Electric Microwave filter
US3546635A (en) * 1968-08-13 1970-12-08 Us Air Force Waveguide mode selective absorber

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602114A1 (en) * 1986-07-23 1988-01-29 Esswein Sa Microwave oven with harmonics-rejecting filter
EP1122808A1 (en) * 2000-01-31 2001-08-08 Hitachi, Ltd. High-frequency communication apparatus and method of manufacturing the same
US6580395B2 (en) * 2000-01-31 2003-06-17 Hitachi, Ltd. High-frequency communication apparatus and method of manufacturing the same
US6710745B2 (en) 2000-01-31 2004-03-23 Hitachi, Ltd. High-frequency communication apparatus and method of manufacturing the same
CN1759498B (en) * 2003-03-20 2011-05-25 汤姆森特许公司 Method for manufacturing polarization splitter
WO2004084337A1 (en) * 2003-03-20 2004-09-30 Thomson Licensing Waveguide frequency-band/polarization splitter
US20060232360A1 (en) * 2003-03-20 2006-10-19 Philippe Chambelin Waveguide frequency-band/polarization splitter
US7218801B2 (en) 2003-03-20 2007-05-15 Thomson Licensing Waveguide frequency-band/polarization splitter
FR2852739A1 (en) * 2003-03-20 2004-09-24 Thomson Licensing Sa Polarized wave separator for use in bidirectional transmission satellite, has two filters with one end coupled to respective slits and another end constituting respective individual input/output
US20100052823A1 (en) * 2008-08-29 2010-03-04 Azure Shine International Inc. Filter unit
US7898368B2 (en) * 2008-08-29 2011-03-01 Azure Shine International Inc. Filter unit
CN101673862B (en) * 2008-09-09 2013-01-02 也翔国际股份有限公司 Satellite antenna equipment, transceiver module and filtering unit thereof
US11996600B2 (en) 2018-11-14 2024-05-28 Optisys, Inc. Hollow metal waveguides having irregular hexagonal cross sections with specified interior angles
KR20210090684A (en) * 2018-11-14 2021-07-20 옵티시스, 엘엘씨 Hollow metal waveguide having irregular hexagonal cross section and method for manufacturing same
US11211680B2 (en) 2018-11-14 2021-12-28 Optisys, LLC Hollow metal waveguides having irregular hexagonal cross-sections formed by additive manufacturing
WO2020102543A1 (en) * 2018-11-14 2020-05-22 Optisys, LLC Hollow metal waveguides having irregular hexagonal cross-sections and methods of fabricating same
USRE50560E1 (en) 2018-11-14 2025-08-26 Optisys, Inc. Hollow metal waveguides having irregular hexagonal cross-sections and methods of fabricating same
WO2020106774A1 (en) * 2018-11-19 2020-05-28 Optisys, LLC Irregular hexagon cross-sectioned hollow metal waveguide filters
US11233304B2 (en) 2018-11-19 2022-01-25 Optisys, LLC Irregular hexagon cross-sectioned hollow metal waveguide filters
US12183963B2 (en) 2020-10-19 2024-12-31 Optisys, Inc. Device comprising a transition between a waveguide port and two or more coaxial waveguides
US12183970B2 (en) 2020-10-29 2024-12-31 Optisys, Inc. Integrated balancing radiating elements
US12009596B2 (en) 2021-05-14 2024-06-11 Optisys, Inc. Planar monolithic combiner and multiplexer for antenna arrays

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