US3914713A - Microwave circuits constructed inside a waveguide - Google Patents

Microwave circuits constructed inside a waveguide Download PDF

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Publication number
US3914713A
US3914713A US361817A US36181773A US3914713A US 3914713 A US3914713 A US 3914713A US 361817 A US361817 A US 361817A US 36181773 A US36181773 A US 36181773A US 3914713 A US3914713 A US 3914713A
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Prior art keywords
waveguide
circuit elements
flat member
circuits
circuit
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US361817A
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English (en)
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Yoshihiro Konishi
Kenichi Konno
Norihiko Yazawa
Norio Hoshino
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Japan Broadcasting Corp
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Japan Broadcasting Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
    • H01P5/181—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being hollow waveguides
    • H01P5/182—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being hollow waveguides the waveguides being arranged in parallel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/18—Phase-shifters
    • H01P1/185—Phase-shifters using a diode or a gas filled discharge tube
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/38—Circulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/04—Coupling devices of the waveguide type with variable factor of coupling
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
    • H03B19/16—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source using uncontrolled rectifying devices, e.g. rectifying diodes or Schottky diodes
    • H03B19/18—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source using uncontrolled rectifying devices, e.g. rectifying diodes or Schottky diodes and elements comprising distributed inductance and capacitance
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D9/00—Demodulation or transference of modulation of modulated electromagnetic waves
    • H03D9/06—Transference of modulation using distributed inductance and capacitance
    • H03D9/0608—Transference of modulation using distributed inductance and capacitance by means of diodes
    • H03D9/0633—Transference of modulation using distributed inductance and capacitance by means of diodes mounted on a stripline circuit
    • H03D9/0641—Transference of modulation using distributed inductance and capacitance by means of diodes mounted on a stripline circuit located in a hollow waveguide
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/02—Transference of modulation from one carrier to another, e.g. frequency-changing by means of diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D9/00—Demodulation or transference of modulation of modulated electromagnetic waves
    • H03D9/06—Transference of modulation using distributed inductance and capacitance
    • H03D9/0608—Transference of modulation using distributed inductance and capacitance by means of diodes
    • H03D9/0616—Transference of modulation using distributed inductance and capacitance by means of diodes mounted in a hollow waveguide
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D9/00—Demodulation or transference of modulation of modulated electromagnetic waves
    • H03D9/06—Transference of modulation using distributed inductance and capacitance
    • H03D9/0608—Transference of modulation using distributed inductance and capacitance by means of diodes
    • H03D9/0633—Transference of modulation using distributed inductance and capacitance by means of diodes mounted on a stripline circuit

Definitions

  • ABSTRACT By inserting a rectangular conductive flat member into a waveguide in contact relation of their edge portions to the waveguide walls in parallel with an electric field therein, cut-off frequencies at portions of the waveguide to which the conductive flat member is inserted become higher to form a cut-off region.
  • the conductive flat member is composed of a conductor plate or by evaporating a conductive thick film on a dielectric or magnetic plate.
  • the conductive flat member occasionally lined with a non-conductive flat member is provided with circuit elements such as slots formed by punching and strip lines or semiconductor diodes formed by evaporation, and microwave circuits having various functions such as filter circuits, directional couplers, oscillator circuits, frequency converter circuits, frequency multiplier circuits, switch circuits, phase shifter circuits, etc. are constructed on the conductive flat member by combination of the circuit elements through mutual coupling therebetween.
  • These microwave circuits are coupled to transmission regions of the waveguide adjoining both sides of the cutoff region by circuit elements located at the end portion of the conductive flat member. Accordingly, only by inserting into the waveguide a conductive flat member on which various circuit elements are provided, desired microwave circuits of various kinds are constructed very easily inside the waveguide.
  • Such microwave circuits are small in size and low in transmission loss due to elimination of waveguide converters conventionally used, and are suitable for mass production due to simplicity of structure and ease of manufacturing and assembling which results from mechanical working technique of high degree being unnecessary.
  • This invention relates to microwave circuits, and particularly, to basic microwave circuits with which various microwave devices of different functions can be realized with simple structure without need of waveguid converter portions.
  • microwave circuits are formed in small size by metal-evaporating circuit elements consisting of a strip line or slotted line on dielectric or magnetic base plates.
  • metal-evaporating circuit elements consisting of a strip line or slotted line on dielectric or magnetic base plates.
  • waveguides are inferior to waveguides as transmission line, so that microwave devices using [C circuits, in general, are constructed by a combination of IC circuits and waveguides as the transmission line, both of them being connected by means of waveguide converters. Therefore, as a whole of the device an extra space is required owing to the waveguide converter portion and loss caused thereat is added.
  • circuit elements were formed inside a waveguide, unless all of them are constructed on a one-body plate inserted into it, mechanical working therefor needs a considerably higher degree of machining and assembling, so that such a way is not suitable for mass-production and presents difficulty of reduction in size.
  • the invention is characterized in that inside of a waveguide a one-body conductive flat member is provided in parallel with its E-plane so as to form a cut-off region, whereby desired functions are obtained by mutual coupling between a plurality of circuit elements comprising any of slot circuits formed on said conductive flat member and strip lines formed on a nonconductive flat member lining it and by coupling between the transmission region of said waveguide and said circuit elements.
  • one-body conductive plates or those combined with dielectric or magnetic non-conductive plates are provided with circuit ele ments in the form of a slot line, strip line or modified slot line of image type, and subsequently such plates are inserted into the waveguide in parallel with its E- plane.
  • FIG. la shows schematically a'basic construction of a microwave circuit of the invention in longitudinal section parallel to the E-plane of the waveguide;
  • FIG. 1b shows a transverse section shown in the circuit of FIG. la perpendicular to the axis of the waveguide;
  • FIGS. 2a and 2b show longitudinal and transverse sections of an embodiment of a lumped constant-type band pass filter according to the invention, respectively;
  • FIG. 3 is a fragmentary perspective view of the embodiment shown in FIG. 2;
  • FIGS. 4a and 4b show longitudinal and transverse sections of a further band pass filter of a modified slot type according to the'invention, respectively;
  • FIG. 5a is a schematic view for explanation of a slot line of a conventional type
  • FIG. 5b is a similar schematic view for explaining a slot line of an image type
  • FIG. 50 is a schematic sectional view showing conversion from image type to conventional type of slot line
  • FIG. 6 shows in longitudinal'section another band pass filter of the slot type
  • FIGS. 7a and 7b show longitudinal and transverse sections of a narrow band elimination filter according to the invention, respectively;
  • FIG. 8 shows a longitudinal section of a further narrow band elimination filter according to the invention.
  • FIGS. 9a and 9b show longitudinal and transverse sections of another narrow band elimination filter according to the invention, respectively;
  • FIGS. 10 and 11 show longitudinal sections of a comparatively wide band elimination filter according to the invention and of a conventional waveguide type, respectively;
  • FIGS. 12a and 12b show longitudinal and transverse sections of an embodiment of a directional coupler according to the invention, respectively;
  • FIGS. 13a and 13b are sectional veiws of two components for use in an oscillator or mixer circuit according to the invention, respectively;
  • FIGS. 13c and 13d show longitudinal and transverse sections of the oscillator or mixer circuit constructed by assembling said 'two components, respectively;
  • FIGS. 14a and 14b show longitudinal and transverse sections of an embodiment of an up-converter according to the invention, respectively;
  • FIG. 15a is a schematic plan view of an embodiment of an E-plane circulator according to the invention.
  • FIG. 15b is a sectional view taken along line AA in FIG. 15a;
  • FIG. 16a shows a schematic perspective view of an embodiment of a frequency doubler circuit according to the invention.
  • FIG. 16b is an elevation of a plane circuit to be inserted along line A"-B"-C" in FIG. 16a;
  • FIGS. 17a through 17d illustrate schematically a diode switch circuitof a travelling wave type and a digital phase shifter employing said switch circuit.
  • FIGS. la and lb a basic construction of a microwave circuit arrangement according to the invention will be explained hereinbelow.
  • terminals of the waveguide are shown as comprising two openings.
  • one or more openings can be provided, and the whole of the input and output portions used not necessarily be constructed with the waveguide, so that part of them may be formed by a slotted line.
  • a conductiveplate 1 consisting of a conductor plate or a conductive plate lined with a dielectric or magnetic base plate are provided various microwave planar circuit elements 2, 3 and 4, which are inserted into a waveguide 5 in parallel with its E-plane.
  • An input electromagnetic field 6 is coupled at an end portion la of an inserted plate 1 (conductive plate mentioned above) beyond its rectangular edge to a circuit element 2 provided thereon closely adjacent to the transmission region of the waveguide and renders excitation of the circuit element 2.
  • a middle portion 1b of the insertion plate 1 where the mode of the waveguide for the frequency band utilized is in cut-off due to the insertion plate being conductive, the input electromagnetic field 6 of the waveguide 5 is attenuated sufficiently within the region of the inserted conductive plate and thus is never coupled directly to an output side 7 of the waveguide 5.
  • microwave devices occupy minimal inner space of the waveguide, and besides can be obtained by simple working, that is, inserting the one-body conductive plate 1 into the waveguide 5, previously provided with microwave circuit elements before the insertion, for example by punching for metallic plates or by an evaporation technique or thick film printing technique of metal with the aid of dielectric or magnetic base plates, thereby reducing the size of devices and enabling mass-production.
  • microwave devices can be used for filter circuits, directional couplers, oscillating circuits, frequency converter circuits, switch circuits, multiplier circuits, phase shifter circuits, etc.
  • FIG. 2a shows a longitudinal section of the embodiment in which the waveguide 5 is cut in parallel to the E-plane
  • FIG. 2b shows a transverse section of the waveguide 5.
  • the rectangular conductor plate 1 is inserted into the center of the waveguide 5, and the conductor plate 1 is provided with resonators 8 in the form of a slot as illustrated in FIG. 2a.
  • the resonators 8 are shown as being formed by the slots each punched in the shape of an H.
  • the resonators are not restricted to the H- shape and can be obtained by an opening of any shape such as a rectangular of circular form punched on the conductor plate.
  • its horizontal slot portion 8a serves as a capacitor of the lumped constant type, rendering the slot type resonator 8 small sized and facilitating its frequency adjustment.
  • a band pass filter can be constructed, as shown in FIG. 3, by sandwiching the conductor plate 1 between two waveguide portions 5' and 5" which are obtained by dividing the waveguide 5 into two parts. In such configuration, respective components can easily be manufactured and assembled and consequently are suitable for mass-production.
  • FIGS. 4a and 4b illustrate an embodiment employing a modified-type slotted line 10 incorporated with the conductor plate 1 between a transmission region of the waveguide 5 and a pair of resonators 9 on the plate 1.
  • This modified-type slotted line 10 has such a construction that at the center of a slot portion 12 of the slotted line formed by two conductor plates 11 and 11 as shown in FIG. 5a is inserted a conductive plate 13 corresponding to the wall surface of the waveguide 5 shown in FIG. 4a, and hence a slot line of image type is formed as'shown in FIG. 5b.
  • This may be considered to be a kind of thin type ridge line inside of the waveguide. It should be noted that conversion between an image type slot line and a conventional-type slot line can easily be accomplished by a circuit as illustrated in FIG. 50.
  • a conventional type slot line is composed of a pair of thin coplanar conductive plates having cooperating edges spaced apart along the narrow interspace between them for forming therealong a continuous wave path closely confining the wave energy, so that it requires a mechanical working technique of a high degree and presents difficulty in manufacturing and assembling such cooperating edges exactly spaced along their entire length.
  • the area of the conductive plates composing the slot line and inserted into a waveguide of specified size is too narrow to provide desired circuit elements of various kinds required for the object of this invention.
  • a single conductive plate is used as for the image-type slot line in a state opposed to the wide wall surface of a waveguide; therefore it is very easy and effective to construct the slot line inside the waveguide and to provide desired circuit elements on the conductive plate composing the slot line.
  • this embodiment is formed by inserting into the waveguide 5 the conductor plate 1 provided with a filter consisting of a M2 slot resonator 14 which has already been developed as a filter.
  • the output portion 7 need not necessarily be a waveguide, but the output portion consisting of a slot line can also be coupled to the filter, without any modification of the filter, to a subsequent circuit.
  • FIGS. 7a and 7b show an embodiment of a very narrow band elimination filter constructed by providing the conductor plate 1 with a slot 15 of )t/ 2 in length and then coupling it to an image-type slot line 16.
  • FIG. 8 is a further embodiment of such a filter wherein a pair of slots 15 are formed
  • FIGS. 9a and 9b show another embodiment in which a dielectric base plate 17 is made to tightly contact with the conductor plate 1 so as to render the filter more compact.
  • FIGS. 10 and 11 show two embodiments of a comparatively wide band elimination filter according to the invention and of conventional type, respectively.
  • the filter shown in FIG. 10 uses an image type slot line 16 and that in FIG. 11 employs a conventional type slot line,- and both of them utilize a dielectric base plate 17 resulting in compactness of construction; otherwise it is difficult as described before to construct the conventional type filter.
  • FIGS. 12a and 12b show an embodiment of a directional coupler comprising the combination of image type slot lines and a conductive plate provided with a plurality of coupling apertures and inserted vertically between fins of the slot lines.
  • an input 18 appears at an output 19 and also at an output 22 through coupling apertures 21 of an insertion plate 20.
  • electromagnetic waves are added in opposite phases via two coupling apertures 21, so that the input 18 does not appear.
  • a similar reverse characteristic is obtained for the input 23. It is possible to broaden the band width by increasing a number of coupling apertures 21.
  • the openings 18, 19, 22 and 23 are shown as the waveguide openings, but even when parts or all of them are formed by slot lines, similar characteristics are obtained.
  • FIGS. 13a, 13b, 13c and 13d show one embodiment of an oscillator circuit or mixer circuit.
  • the conductor plate 1 is provided with a slot 24 of M4 in length with which an L- shaped portion 25 for coupling of diode(s) isformed.
  • a dielectric base plate 26 on which a dielectric base plate 26 are arranged a diode 27, a tuning circuit 28 having a length of M4, a filter 29, an output terminal 30, and
  • the dielectric base plate 26 thus constructed is stacked on the conductor plate 1 in such configuration as shown in FIG. 13c, and its transverse section is shown in FIG. 13d.
  • the terminal 6 serves in the case of an oscillator circuit as an output terminal and in the case of a mixer circuit as an input terminal for an incoming signal and a locally oscillating signal. In the case of the mixer circuit, an IF output is derived from the output terminal 30.
  • FIGS. 14a and 14b illustrate one embodiment of an up-converter.
  • a microwave input 6 is fed via a filter 32 to a diode 33.
  • this filter 32 one of those filters shown in FIGS. 2, 4, 7, etc. can be used.
  • the diode 33 together with a tuning element 34 is mounted previously on a dielectric base plate 35.
  • Reference numeral 36 represents an IF filter of the strip line type which eliminates microwaves.
  • An IF signal is supplied from a terminal 37 so that the diode 33 is excited, resulting in frequency conversion.
  • the frequency-converted signal appears at an output terminal 39 through an output filter 38.
  • FIGS. 15a and 15b show an embodiment in which a known circulator of the slot-type is inserted into a waveguide 40.
  • the E-plane of the waveguide 40 is branched in the shape of Y.
  • the slot type circulator comprises a Y-branched dielectric base plate 41, on which a Y-branched slot line is formed by metallic covering layer 42, and a ferrite disc 44 is attached to the branching portion 43 of the slot line.
  • a direct current magnetic field is applied to the ferrite disc 44 perpendicular to the E-plane of the waveguide 40.
  • such a dc. magnetic field is applied to the ferrite disc 44 by means of magnets 45 as shown in FIG. 15b.
  • a composite rectangular waveguide generally indicated by numeral 50 is constructed by connecting a waveguide portion W which passes a fundamental wave to a waveguide portion W which passes higher harmonics.
  • a plane circuit 52 so called according to the invention and represented by a broken line, which comprises in succession, as shown in FIG. 16b, a fundamental wave pass filter F a higher harmonics elimination filter F a frequency doubling circuit portion FD and a higher harmonics pass filter F each circuit element being constructed such as mentioned before.
  • the fundamental wave which passed through the band pass filter F is fed via the image-type slot line to a diode (for example, a varactor diode) D which generates higher harmonics. Then, the higher harmonics generated at the diode D is derived via the band pass filter F 2 from the right end of the waveguide.
  • a diode for example, a varactor diode
  • the distance between the diode D and point B is maintained at K /4 (A is wavelength of the fundamental wave inside the waveguide portion W the impedance viewed from the diode D towards it right side presents a higher value, so that the fundamental wave is applied to the diode D with very high efficiency.
  • the distance d of the portion of the slot line in the waveguide portion W is chosen so that similarly, the impedance viewed from the diode D towards its left side has a high value, maximum output of the higher harmonics can be obtained.
  • the higher harmonics elimination filter F serves to prevent the higher harmonics from leakage towards the left side from the waveguide portion W 7.
  • a switching diode D is disposed at the location having its both sides coupled to image-type slot lines, respectively, in such a manner that a dc. voltage can be applied to said diode as shown in FIG. 17b.
  • the slot line at the location of the diode is short-circuited or made open by connection or disconnection of the d.c. voltage, transmission of 170 waves is also switched on or off.
  • FIG. 17c can be constructed which provides functions of an equivalent circuit shown in FIG. 17d. That is, a plane circuit is constructed with a plurality of short-circuiting conductive strips in such a manner that parts of the respective conductive strips can be short-circuited or made open by corresponding diodes D D If phases a, and a indicated in FIG. 17c satisfy the following relations,
  • the plane circuit thus constructed provides desired phase variation 4) to the electromagnetic waves fed to the input (for example, the left side) of the waveguide by suitably switching on or off the dc. voltage applied to the respective diodes D D so as to short-circuit the diode(s) at proper phase location(s), and subsequently the electromagnetic waves varied in phase can be derived from the output (for example, the right side) of the waveguide.
  • this plane circuit may serve as a digital phase shifter.
  • the phase variation (12 mentioned above can be changed in a digital manner depending upon which of the diodes or which combination of the diodes is short-circuited.
  • the microwave circuits according to the invention are simple in structure so that manufacturing and assembling them are facilitated, thereby enabling them to be produced in large scale. That is to say, as shown in FIG. 3, working to the waveguide is sufficient to divide it into two parts (or four parts in the embodiment of FIG. 12) in parallel with its E-plane, and such configuration can easily be obtained by molding of plastic material. Plastic members thus molded for two halves of a waveguide are subjected to metal plating or covered with metal foil to provide conductivity so that a complete waveguide can be obtained.
  • a conductive plate to be inserted inside of the waveguide requires only a punching operation and moreover electrodes on the dielectric base plate can be constructed by thick film circuits utilizing vapor-deposition or printing techniques so that it is very suitable for mass-production. Furthermore, characteristics of the'microwave circuits according to the invention are determined by circuits provided on the base plate to be inserted inside the waveguide, so that making the waveguide of plastic material, etc. which expand or contract slightly depending upon temperature has lesser influence on characteristics. In addition, upon dividing into two parts the waveguide is so split so that its split planes are proportioned in parallel with the E-plane and at the center of the H- plane, resulting in such advantage that leakage in current inside the waveguide at the split planes is small.
  • the conductive plate which is inserted inside the waveguide in parallel with the E-plane can be located at other than the central portion thereof.
  • the cut-off frequency in this case does not become double of that of the waveguide before insertion of such a conductive plate.
  • a number of conductive plates to be inserted is not limited to one, but two or more conductive plates can be inserted as shown in FIG. lb.
  • a microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band pass filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, the circuit elements coupled to the transmission region of the waveguide comprising image-type slot lines.
  • a microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band elimination filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, a plurality of said circuit elements comprising any of half-wavelength resonators and image-type slot lines.
  • a microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flat member including a plurality of planar circuit elements wherein a plurality of said circuit elements form a band elimination filter both by coupling said circuit elements between each other and by coupling between said circuit elements and a transmission region of the waveguide, the circuit elements which are coupled to said transmission region of the waveguide comprising image-type slot lines.
  • a microwave circuit comprising a waveguide, and a single conductive flat member ending with an uninterrupted edge, and arranged inside said waveguide in parallel with the E-plane to form a cut-off region, said single flalt member including a plurality of planar circuit elements wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide to provide desired functions, and wherein said single conductive flat member is slant shaped to form an opening of an image-type slot line.
  • a microwave circuit comprising a waveguide, and a conductive flat member arranged inside the waveguide in parallel with its E-plane to form a cut-off region, said flat member including a plurality of planar circuit elements, wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide, said plurality of circuit elements forming a band pass filter by both couplings, said circuit elements coupled to said transmission region including imagetype slot lines.
  • a microwave circuit comprising a waveguide, and a conductive flat member arranged inside the waveguide in parallel with its E-plane to form a cut-off region, said flat member including a plurality of planar circuit elements, wherein a plurality of the circuit elements are coupled between each other and said circuit elements are coupled to a transmission region of said waveguide, said plurality of circuit elements forming a band elimination filter by both couplings, said circuit elements coupled to said transmission region including image-type slot lines.

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
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  • Control Of Motors That Do Not Use Commutators (AREA)
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US361817A 1972-05-23 1973-05-18 Microwave circuits constructed inside a waveguide Expired - Lifetime US3914713A (en)

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JP47050993A JPS583401B2 (ja) 1972-05-23 1972-05-23 マイクロハカイロ

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US4028650A (en) * 1972-05-23 1977-06-07 Nippon Hoso Kyokai Microwave circuits constructed inside a waveguide
US4467294A (en) * 1981-12-17 1984-08-21 Vitalink Communications Corporation Waveguide apparatus and method for dual polarized and dual frequency signals
FR2560442A1 (fr) * 1984-02-24 1985-08-30 Thomson Csf Dispositif de commutation et de limitation a ligne a fente, fonctionnant en hyperfrequences
US4568893A (en) * 1985-01-31 1986-02-04 Rca Corporation Millimeter wave fin-line reflection phase shifter
US4622524A (en) * 1984-02-24 1986-11-11 Ant Nachrichtentechnik Gmbh Dual band polarization filter comprising orthogonally oriented fin-type conductors
US4789840A (en) * 1986-04-16 1988-12-06 Hewlett-Packard Company Integrated capacitance structures in microwave finline devices
US4800349A (en) * 1986-09-18 1989-01-24 Alcatel Thomson Faisceaux E-plane type wide band composite filter
US4873501A (en) * 1986-06-27 1989-10-10 The United States Of America As Represented By The Secretary Of The Navy Internal transmission line filter element
US4894627A (en) * 1989-01-03 1990-01-16 Motorola, Inc. Directional waveguide-finline coupler
US5945894A (en) * 1995-03-22 1999-08-31 Murata Manufacturing Co., Ltd. Dielectric resonator and filter utilizing a non-radiative dielectric waveguide device
US6392508B1 (en) * 2000-03-28 2002-05-21 Nortel Networks Limited Tuneable waveguide filter and method of design thereof
US6531936B1 (en) * 1998-10-16 2003-03-11 Paratek Microwave, Inc. Voltage tunable varactors and tunable devices including such varactors
US6661315B2 (en) * 2000-03-07 2003-12-09 Murata Manufactuing Co. Ltd Resonator, filter, oscillator, duplexer, and communication apparatus
US20040201437A1 (en) * 2003-03-31 2004-10-14 Tong Dominique Lo Hine Floating microwave filter in a waveguide structure
US20110241795A1 (en) * 2008-12-26 2011-10-06 Takafumi Kai Bandpass filter
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WO2014161567A1 (en) * 2013-04-02 2014-10-09 Telefonaktiebolaget L M Ericsson (Publ) A waveguide e-plane filter structure
RU2654989C1 (ru) * 2017-05-22 2018-05-23 Акционерное общество Центральное конструкторское бюро аппаратостроения Волноводный направленный ответвитель
US10249929B1 (en) * 2016-01-29 2019-04-02 The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Multimode directional coupler
RU2696817C1 (ru) * 2019-01-09 2019-08-06 Михаил Борисович Гойхман Перестраиваемый полосно-запирающий волноводный фильтр
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US4642584A (en) * 1984-02-24 1987-02-10 Thomson-Csf Slot-line switching and limiting device for operation at microwave frequencies
EP0154583A1 (fr) * 1984-02-24 1985-09-11 Thomson-Csf Dispositif de commutation et de limitation à ligne à fente, fonctionnant en hyperfréquences
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FR2560442A1 (fr) * 1984-02-24 1985-08-30 Thomson Csf Dispositif de commutation et de limitation a ligne a fente, fonctionnant en hyperfrequences
US4568893A (en) * 1985-01-31 1986-02-04 Rca Corporation Millimeter wave fin-line reflection phase shifter
US4789840A (en) * 1986-04-16 1988-12-06 Hewlett-Packard Company Integrated capacitance structures in microwave finline devices
US4873501A (en) * 1986-06-27 1989-10-10 The United States Of America As Represented By The Secretary Of The Navy Internal transmission line filter element
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US5945894A (en) * 1995-03-22 1999-08-31 Murata Manufacturing Co., Ltd. Dielectric resonator and filter utilizing a non-radiative dielectric waveguide device
US6531936B1 (en) * 1998-10-16 2003-03-11 Paratek Microwave, Inc. Voltage tunable varactors and tunable devices including such varactors
US6661315B2 (en) * 2000-03-07 2003-12-09 Murata Manufactuing Co. Ltd Resonator, filter, oscillator, duplexer, and communication apparatus
US6392508B1 (en) * 2000-03-28 2002-05-21 Nortel Networks Limited Tuneable waveguide filter and method of design thereof
US20040201437A1 (en) * 2003-03-31 2004-10-14 Tong Dominique Lo Hine Floating microwave filter in a waveguide structure
US7030720B2 (en) * 2003-03-31 2006-04-18 Thomson Licensing Floating microwave filter in a waveguide structure
US8988171B2 (en) * 2008-12-26 2015-03-24 Nec Corporation Multi-resonator waveguide bandpass filter
US20110241795A1 (en) * 2008-12-26 2011-10-06 Takafumi Kai Bandpass filter
WO2011134497A1 (en) * 2010-04-27 2011-11-03 Telefonaktiebolaget L M Ericsson (Publ) A waveguide e-plane filter structure
US9472836B2 (en) 2010-04-27 2016-10-18 Telefonaktiebolaget Lm Ericsson (Publ) Waveguide E-plane filter structure
WO2014161567A1 (en) * 2013-04-02 2014-10-09 Telefonaktiebolaget L M Ericsson (Publ) A waveguide e-plane filter structure
US9799937B2 (en) 2013-04-02 2017-10-24 Telefonaktiebolaget Lm Ericsson (Publ) Waveguide E-plane filter structure
US10249929B1 (en) * 2016-01-29 2019-04-02 The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Multimode directional coupler
US20200091577A1 (en) * 2016-12-12 2020-03-19 European Space Agency (Esa) Directional coupler and a method of manufacturing thereof
US10957965B2 (en) * 2016-12-12 2021-03-23 European Space Agency (Esa) Directional coupler and a method of manufacturing thereof
RU2654989C1 (ru) * 2017-05-22 2018-05-23 Акционерное общество Центральное конструкторское бюро аппаратостроения Волноводный направленный ответвитель
RU2696817C1 (ru) * 2019-01-09 2019-08-06 Михаил Борисович Гойхман Перестраиваемый полосно-запирающий волноводный фильтр

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Publication number Publication date
FR2185866B1 (pt) 1976-04-23
NL173222B (nl) 1983-07-18
NL173222C (nl) 1983-12-16
JPS583401B2 (ja) 1983-01-21
DE2326331A1 (de) 1973-11-29
NL7307150A (pt) 1973-11-27
CA977049A (en) 1975-10-28
BR7303774D0 (pt) 1974-07-11
AU5597073A (en) 1974-11-28
FR2185866A1 (pt) 1974-01-04
JPS4910648A (pt) 1974-01-30
GB1438149A (en) 1976-06-03
DE2326331B2 (de) 1978-06-01

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