Abstract: A high power adjustable rf coupling loop which is used to interface a transmission line to a resonant cavity is described The coupling loop is made entirely of metallic parts and therefore is ideal for high power rf applications. Contrary to all existing loops it does not require water cooling. Among the unique features of this loop is the fact that it is adjustable. Subsequently the combined impedance of the loop and cavity can be adjusted to match perfectly with the line impedance rendering almost zero reflected power.

Abstract: The present invention relates to a device (1) for transmitting or receiving electromagnetic waves in a cavity (3), where the device comprises a loop (10) and a dielectric part (9) that houses at least a first end part (11) of the loop. The dielectric part comprises a first recess (37) designed to receive a means (30) for setting the capacitance between the loop and an earthed cavity housing (5), cover (6) or casing (2) for electric and/or electronic components. The invention also relates to a method for manufacturing the device, a method for manufacturing the loop, a cavity filter (4) and the casing.

Abstract: A cavity resonator for reducing the phase noise of microwaves or millimeter waves output from a monolithic microwave integrated circuit (MMIC) voltage controlled oscillator (VCO) by using silicon (Si) or a compound semiconductor and a micro electro mechanical system (MEMS), and a method for fabricating the cavity resonator are provided. In the cavity resonator, instead of a conventional metal cavity, a cavity, obtained by finely processing silicon or a compound semiconductor, is coupled to a microstrip line to allow the cavity resonator to be adopted in a reflection type voltage controlled oscillator. A pole is provided to connect the edge of the microstrip line to a predetermined location of a cavity lower thin film. A coupling slot is formed by removing a predetermined width of a cavity upper thin film adjacent to the pole which comes in contact with the cavity upper thin film. A resistive thin film for impedance matching is formed around the cavity lower thin film which comes in contact with the pole.

Abstract: A coupling mechanism for coupling adjacent cavities which includes a window having side walls joining two cavities and a coupling member extending into said window between said side walls. The coupling member is movable between said side walls to adjust the coupling.

Abstract: A receive/transmit multi-cavity filter having input and output filter sections coupled to an antenna by a single cavity.

Abstract: A filter includes a dielectric resonator, a cavity for holding the dielectric resonator therein, an external connector mounted on the cavity, and a coupling loop connected to the external connector so as to electromagnetically couple with the dielectric resonator. The coupling loop is formed by bending a metal plate nearly into the shape of an L, and is provided with a rib extending in a direction that is not parallel to the bending line.

Abstract: The invention proposes to reduce the costs of waveguide filters, especially for filters operating at millimeter wavelengths which require high accuracy. The filter of the invention is composed of a plurality of discs 2, 3 held in the cylinder of a support 1. The various parts constituting the filter are very much simplified which makes it possible to reduce the production costs while having good accuracy.

Abstract: There is provided a cavity resonator for reducing the phase noise of electromagnetic waves output from a monolithic microwave integrated circuit (MMIC) voltage controlled oscillator (VCO) by utilizing a semiconductor (e.g., silicon, GaAs or InP) micro machining technique. In the cavity, instead of an existing metal cavity, a cavity, which is obtained by micro machining silicon or a compound semiconductor, is coupled to a microstrip line to allow the cavity resonator to be adopted in a reflection type voltage controlled oscillator. A coupling slot is formed by removing a predetermined size of the part of an upper ground plane film of a cavity facing to the microstrip line. Consequently, the cavity resonator reduces the phase noise of microwaves or millimeter waves which are output from a voltage controlled oscillator.

Abstract: An electromagnetic cavity filter is formed by at least two cavities having electrically conductive walls. Each cavity is the equivalent of two filter poles because two orthogonal modes of electromagnetic radiation can resonate within each cavity. Characterizing vector tuning elements are coupled to each of the cavities that are each aligned along respective axes. The tuning elements are used to provoke derivative orthogonal modes and determine the degree of coupling between orthogonal modes. One or more intercavity couplers interconnect the cavities and are rotated at arbitrary angles that are different from the axes of the characterizing vector tuning elements. Electrically adjacent and nonadjacent modes of proximate cavities can be coupled, permitting elliptic filter functions. Electrically nonadjacent modes are coupled by means of an iris interconnecting the two cavities. Electrically adjacent modes are coupled by means of an electrically conductive probe penetrating each of the cavities.

Abstract: An assembly for supporting a substrate of an integrated circuit and forming a cavity resonator with the substrate. The assembly includes a baseplate in which a cavity for the cavity resonator is integrally formed. A substrate is mounted over the cavity resonator in the baseplate and an excitation coupling extends into the cavity of the cavity resonator.

Abstract: A dielectric loaded cavity filter having a housing and a cover and defining at least two adjacent cavities having respective dielectric resonators mounted therein and separated by a transverse partition defining a coupling window in the housing. In one form, the coupling window has two spaced opposing sidewalls confronting each other, and vertically offset shoulders intermediate their length. A conductive coupling strip is secured to the shoulder of one sidewall and extends across the coupling window and over the shoulder of the other sidewall. A tuning screw is secured by threading to the housing and has an outer free end accessible from the exterior of the filter, and an internal end disposed adjacent the coupling strip, whereby when the tuning screw is rotated, the internal end of the screw moves toward and away from the coupling strip in a direction perpendicular to the cover for tuning without requiring access to the coupling strip.

Abstract: The invention provides a dual-mode microwave filter, comprising a rectangular resonator of length l, height b, and width a operating in two distinct modes (m, 0, n) and (p, 0, q) from a single family of modes and presenting the same direction as the E field, and wherein coupling and mode excitation discontinuities are inductive and in the same direction.

Abstract: A device and a method for microwave feeding of an oven cavity by means of a coupling slot (1) which is fed by a waveguide. The a-dimension of the waveguide is significantly larger than the effective a-dimension of the slot. The slot comprised a radiating main slot part (5) and slot extensions (6,7) projecting from it at its respective sides, which extension have a substantially smaller cross-dimension than the b-dimension of the main slot part.

Abstract: To realize electromagnetic couplings in a high-frequency filter a coupling element (100) comprises a first conductor (201), which has a first end (102) and a second end (103), and an insulating part (101). A portion of the first conductor, located between the first end and second end of the first conductor, is wholly surrounded by the insulating part. On both sides of said portion the first conductor comprises a portion which is outside the insulating part. The insulating part is arranged so as to become attached inside the high-frequency filter.

Abstract: A receive/transmit multi-cavity filter having input and output filter sections coupled to an antenna by a single cavity.

Abstract: A cavity-coupled microwave filter that uses TE011 and TE01&dgr; mode resonators. The cavity-coupled microwave filter includes an input port, a first resonator having a first opening, wherein the first opening receives electromagnetic energy from the input port, a second resonator having a second opening, wherein the second opening receives electromagnetic energy from the input port and wherein the first resonator and the second resonator are electromagnetically coupled. The cavity-coupled microwave filter further includes an output port, a third resonator having a third opening, wherein the third opening transfers electromagnetic energy to the output port and wherein the second resonator and the third resonator are electromagnetically coupled and a fourth resonator having a fourth opening, wherein the fourth opening transfers electromagnetic energy to the output port and wherein the third resonator and the fourth resonator are electromagnetically coupled.

Abstract: A distributed element filter is realized which has bandpass characteristics realizing both a flat amplitude characteristic and a flat group delay characteristic throughout the passband at the same time, while realizing transmission zeros in the stopbands. The transfer function s21 of a lowpass prototype filter is expressed by a numerator rational polynomial f(s) having at least one conjugate zeros on the real axis and one conjugate zeros on the imaginary axis and a denominator rational polynomial g(s) as a Hurwitz polynomial of degree 6 or higher; circuit blocks corresponding to the zeros on the real axis and zeros on the imaginary axis are each realized by a multiple resonator filter, and the distributed element filter is realized by a multiple coupling circuit block by setting the conditions on each coupling in corresponding relationship to the zeros on the real axis or zeros on the imaginary axis.

Abstract: A high-frequency energy supply device has a group of side resonators which are electrically connected in a practically annular form, and supply high-frequency energy using resonant high-frequency electromagnetic fields generated in the center portion; and a plurality of high-frequency coupling part for coupling a plurality of high frequency energies propagated from a plurality of high-frequency propagation paths to said group of side resonators; wherein a plurality of high frequencies coupled to said group of side resonators from said plurality of high-frequency coupling means have phases and/or frequencies different from each other.

Abstract: A microwave resonator, in particular for a filter, comprising a resonant cavity having positioned therein a plane resonator element, frequency tuning means, and intermode coupling means, the resonator element being made of a dielectric material that is at least approximately in the shape of a parallelogram and being disposed transversely in the cavity in such a manner that the vertices of the parallelogram are short-circuited to one another by the conductive inner wall of said cavity. The resonator has at least one other plane resonator element made of dielectric material in a shape that is at least approximately that of a parallelogram, the resonator elements being placed close together, mutually parallel, and extending transversely to a central axis of the cavity. The frequency tuning means and the intermode coupling means are positioned between the parallel resonator elements.

Abstract: A filter including first and second resonators and a coaxial cable connecting the resonators. Also, a filter including a housing and stepped impedance resonators wherein the high impedance portions of the stepped resonators are integral with the housing. Also, methods of manufacturing the filters.

Abstract: A path for a material passes through an opening and along a segment through an off-peak region of an electric field. An E-plane bend delivers an electromagnetic wave to the segment. A standing wave is used to heat the material. The peaks or valleys are pushed or pulled by a movable surface or by changing the frequency of the electromagnetic wave. A rectangular choke flange is used at the opening to the segment. A curved segment connects the segment to another segment for heating the material. According to another aspect of the invention, a segment is used to heat just the edge of a planar material.

Abstract: An adjustable coupling arrangement for aperture coupled cavity filters. According to the invention, in an electric wall (24) separating two cavities to be coupled in a bandpass filter, provide a cruciform iris (26) comprising a central aperture (27) having four slits (28,29,30, 31) extending outwardly therefrom. In each slit there is arranged a captive movable rectangular metal slug (36,37,38,39) whose position along the slit's length can be manipulated by a tool that engages the slug when the tool is introduced into a radial passageway (32,33,34 35) that connects the slit with an access hole in the filter's housing. When desired coupling parameters are achieved by manipulating each of the slugs to effectively change the electrical length of the slits, each slug is locked in position by a respective associated locking means actuated by the tool. Because a significant part of the tool is within a passageway during manipulation, the filter's characteristics are not disturbed by its presence.

Abstract: A dielectric resonator filter operating in a magnetic dipole mode includes a plurality of dielectric resonators disposed in a plurality of dielectric resonator cavities. A plurality of coupling mechanism provide an in-line coupling factor between respective resonators of electrically adjacent dielectric resonator cavities. At least one cross-coupling device provides cross-coupling between respective resonators of non-adjacent dielectric resonator cavities. A magnitude and sign of the in-line coupling factors and the cross-coupling factor, provide a dielectric resonator filter, for which a desired amplitude and phase response can be provided.

Abstract: A bandpass filter makes use of at least one waveguide cavity that is thermally compensated to minimize drift of a resonant frequency of the cavity with thermal expansion of cavity components. The compensation relies on deformation of the shape of at least one cavity surface in response to thermally-induced dimensional changes of the cavity. A control rod is used to limit the movement of a point on the deformed surface, while the rest of the surface moves with the thermal expansion. The control rod is made of a material having a coefficient of thermal expansion that is significantly different than that of other filter components. The rod may also be arranged to span more thermally expandable material than defines the filter such that, as the filter expands, the point of deflection is moved toward the interior of the filter beyond its original position.

Abstract: In a quarter-wave coaxial cavity resonator, having a cavity with a cylinder inner wall (1), and bottom (3) and top (4) walls and a symmetry axis (2) with a resonator bar (5), a high coupling degree to a feed line (12) is obtained by a T-formed antenna with two equally long arms forming the antenna proper and the stem (9) forming the lead to the feed line. The antenna proper has one end (10) electrically and mechanically connected to the bottom end (6) of the resonator rod, whereas the opposite end (11) is free, and the antenna is parallel to the resonator rod and at a small distance therefrom.

Abstract: A filter device including a metal cavity (1, 11) closed by two end walls (3a, 3b; 13, 13b) extending transversely relative to the axis of said cavity (1, 11) and at least two dielectric inserts (4a, 4b; 14a to 14d) defining a resonator (5, 15a, 15b) in said cavity, characterized in that it includes at least one coupling iris (7a, 7b; 17) which also extends transversely relative to said axis.

Abstract: A signal output assembly for an inductive output amplifier comprises a primary output cavity including a drift tube enclosing a modulated electron beam. The density modulated beam passes across a gap separating portions of the drift tube and induces an amplified RF signal into the primary output cavity. A secondary output cavity comprises a coaxial resonator terminated in an inductive coupling loop, and a waveguide having a ridge. The coaxial resonator and the inductive coupling loop have a combined electrical length approximately equivalent to an odd multiple of one-quarter wavelengths of the input signal (n&lgr;/4), where n is an odd integer. The coaxial resonator is electrically connected perpendicularly to a center of the ridge such that first and second portions of the ridge extend in opposite directions from the connection with the coaxial resonator to respective ends of the waveguide.

Abstract: The present invention is directed to improved coupling mechanisms for TE.sub.011 and TE.sub.01.delta. mode resonators. In one embodiment, the coupling mechanism provides an adjustable connection for transferring electromagnetic energy from a first resonator to a second resonator. Once the resonators are coupled, the coupling mechanism is adapted to allow adjustment of the magnitude and/or the phase of the electromagnetic energy while preserving the electromagnetic connection between the resonators. In another embodiment, the coupling mechanism provides a connection of the resonators using a waveguide. By varying the connection of the resonators with respect to the waveguide, positive relative coupling and/or negative relative coupling of the electromagnetic energy transferred between the waveguide and the resonators is provided.

Abstract: A millimeter-wave/microwave oscillator circuit and method of fabricating same are disclosed. A high Q-factor resonator is formed by disposing a transferred electron negative resistance device, such as a Gunn diode, or an IMPATT negative resistance device in a semi-circular cross-sectional shaped resonator cavity. The equivalent capacitance of the negative resistance diode can be designed to resonate with the equivalent series inductance for the resonator cavity by adjusting the dimensions of the cavity and the placement of the negative resistance device therein. Very low cost, compact and lightweight microwave and millimeter-wave integrated circuit power sources using negative resistance diodes can be batch manufactured.

Abstract: An electromagnetic filter includes a filter housing containing a first resonant cavity and a second resonant cavity. Resonators are disposed within each of the cavities. The electromagnetic filter also includes a cavity wall separating the first resonant cavity and the second resonant cavity. The cavity wall includes a T-shaped aperture to achieve magnetic coupling between the first resonant cavity and the second resonant cavity.

Abstract: A capacitive coupler for a microwave circuit that has a first cavity and a second cavity separated by a wall. The separating wall has an aperture that, due to its shape, is capacitive. The aperture has a pair of elongated walls separated by a pair of side walls. The elongated walls and the side walls each have a thickness substantially thicker than what is now the industry standard. At least one of the elongated walls has a ridge. Because the distance between the first elongated wall and the second elongated wall is substantially greater than that previously known, the aperture may be easily manufactured.

Abstract: A coupling structure for coupling two resonant cavities, which may be dissimilar, based on providing a metallic surface, called here a guide surface, at an angle intermediate between the orientation of the magnetic field in the two cavities. The guide surface may be one surface of a non-rectangular window cut in a wall separating the two cavities or may be the surface of a coupling screw piercing, at the intermediate angle, a rectangular window in a wall between the two cavities. In the non-rectangular window embodiment, an adjusting tuning screw is provided that screws into a notch in the guide surface. In the angled coupling screw embodiment, coupling is adjusted by providing that more or less of the angled coupling screw extends into the rectangular window. The coupling structure couples any two cavities having mutually orthogonal magnetic fields by providing the guide surface at an orientation so the magnetic field in each cavity has a non-zero projection onto the guide surface.

Abstract: A dielectric filter utilizing a plurality of serially coupled resonators having attenuation maximums at the lower side or higher side, or both, of a pass band frequency region. The filter may include an input element which is coupled with both of a first resonator and a second resonator, and may also include an output element which is coupled with both the last and the next-to-last resonator. In the dielectric filter, it is not necessary to provide an external wire connection to generate such attenuation maximums.

Abstract: The present invention relates generally to filtering in e.g. mobile telephony. A new input loop is introduced wherein the input loop is fixed in its physical relation to the H-field. One end of this input loop is arranged to form a capacitance or an inductance which is then used to adjust the location of the maximum current node in the loop. The adjustment of the position of this maximum current node thereby adjusts the bandwidth of the RF signal. The fixing of the loop has the advantage of simplifying the procedure for tuning the filter. It also has the advantage of reducing the number of tools required for tuning, thereby allowing for a reduction in size occupied by the filter and isolator arrangement, and a reduction in the cabling and materials used.

Abstract: A method of tuning a summing network of a base station and a band-pass filter provided in such base station. Tuning is performed by arranging a moveable part made of a low-loss dielectric material or ferrimagnetic material in a space between an inner conductor and a tubular conductor in a coaxial cable, the width of the cross-section of the moveable part being different from its length, and tuning the summing network by adjusting the phase angle reflecting from the connector by turning the moveable part about an axle which intersects the cross-section substantially perpendicularly, whereby the distance between the moveable part and the inner conductor and/or between the moveable part and the outer conductor changes.

Abstract: An electromagnetic filter includes a filter housing containing a first resonant cavity and a second resonant cavity. Resonators are disposed within each of the cavities. The electromagnetic filter also includes a cavity wall separating the first resonant cavity and the second resonant cavity. The cavity wall includes a T-shaped aperture to achieve magnetic coupling between the first resonant cavity and the second resonant cavity.

Abstract: An actuator for rotation of coupling means such as a loop in a high frequency resonant cavity includes a rotatable member to which the loop is fixed and a rod located adjacent it. The member and rod have interengaging teeth such that when the rod is moved inwardly or outwardly by an operator it causes the member, and hence the loop, to rotate. This is a compact assembly having components which are simple and easy to facilitate. In a preferred embodiment, the rod is located in a groove in the cavity wall.

Abstract: A resonant cavity (49) which facilitates coupling to another resonant cavity includes walls (40, 42) and an electrically conducting mast (43). One of the walls (40) has a coupling orifice (41) for coupling the resonant cavity (49) to another resonant cavity. The electrically conducting mast (43) projects from the second wall (42) opposite the first wall (40) and faces the coupling orifice (41). The electrically conducting mast (43) terminates with a hook-shaped portion (44) which contacts an edge of the coupling orifice (41). The resonant cavity (49) is suited for applications requiring secondary output cavities coupled to inductive output tubes.

Abstract: A resonant structure and filter include a resonant element mounted to the cover of a housing. A transmission line passes through the cover and is connected to a coupling loop. The coupling loop is located adjacent the resonator and is connected to ground. A coupling tuner is attached to the housing and includes a post which is movably attached to the housing. The tuner extends between the coupling loop and the resonator, and may be adjusted to change the electromagnetic coupling.

Abstract: An electromagnetic filter has a unitary filter body defining a number of cavities. A cover for the filter body has several resonators attached to it which are located in the cavities when the cover is attached to the filter body. The cover has a recess into which a transmission line is placed. Passageways through the cover connect the transmission line with coupling mechanisms mounted on the cover adjacent the resonators. The resonators have a generally toroidal shape and the coupling mechanisms are shaped to provide the desired coupling between the transmission line and the resonators. An adjustable capacitor attached to the coupling loop has a passageway through its housing to eliminate moisture from the capacitor. The resonator and cavities may be tuned by use of a tuning mechanism which is also designed to minimize moisture which might prevent movement of the tuner during tuning.

Abstract: A dielectric resonator filter operating in a magnetic dipole mode includes a plurality of dielectric resonators disposed in a plurality of dielectric resonator cavities. A plurality of coupling mechanism provide an in-line coupling factor between respective resonators of electrically adjacent dielectric resonator cavities. At least one cross-coupling device provides cross-coupling between respective resonators of non-adjacent dielectric resonator cavities. A magnitude and sign of the in-line coupling factors and the cross-coupling factor, provide a dielectric resonator filter, for which a desired amplitude and phase response can be provided.

Abstract: In a high frequency transmission arrangement such as that used to deliver microwave energy from a magnetron to a waveguide, a ceramic probe is covered with a non-ceramic dielectric material such as PTFE. This allows the magnetron to operate satisfactorily at low Pressures where arcing would otherwise be expected to occur.

Abstract: An electromagnetic filter includes a plurality of dielectrically-loaded split-ring resonators. The resonators are oriented side-by-side generally within a single plane to achieve side-coupling. The side-coupled orientation of the resonators allows adjacent resonators to be set apart at a distance to achieve electrical coupling. Both the side-coupled orientation of the resonators and the dielectric-loading result in significant volumetric reductions without detrimental decreases in the quality factor of the filter. Coupling screws disposed between adjacent resonators provide further control over the coupling between adjacent resonators.

Abstract: A high frequency micromachined filter assembly comprises at least one microresonator having at least one metal-lined resonance chamber and at least two openings. Input means couples an electromagnetic input signal to the resonance chamber through a first one of the openings. The output signal is coupled to output means from the resonance chamber through a second one of the openings. Dielectric material is arranged between the input means and the resonance chamber to maintain the resonator and the input means separated from one another. Dielectric material is arranged between the output means and the resonance chamber to maintain the resonator and the output means separated from one another.

Abstract: A dielectric resonator loaded cavity filter comprises a housing having an exterior and an interior, the housing interior including at least two adjacent cavities having dielectric resonators mounted therein. The adjacent cavities are separated by a transverse partition having a coupling window therein, the coupling window having first and second spaced opposing sidewalls. In one embodiment a coupling disk is interposed between opposing sidewalls of the transverse partition. In another embodiment a coupling strip extends from a shoulder portion of a first opposing sidewall toward a shoulder portion of a second opposing sidewall.

Abstract: An electromagnetic bandstop filter comprises a microwave circuit, at least one microwave resonator, coupling means that couples electromagnetic energy to and from the microwave resonator, and an impedance transformer coupled to, and in series with, the coupling means, wherein the transformer is coupled to the resonator only through the coupling means, and wherein the impedance transformer is shunt coupled to the microwave circuit. The impedance transformer comprises at least two series-connected transmission line sections of different impedances.

Abstract: A dual TM-mode dielectric resonator apparatus comprises a dual TM-mode dielectric resonator consisting of two columnar TM-mode dielectric resonators (1) crossed inside a cavity (2); and a partition plate (3) providing a window for electromagnetic field coupling between an external apparatus and the dielectric resonator. The partition (3) is disposed on the side surface of the cavity (2) opposing the external apparatus and constituted by forming a first shield conductor (30a) on a first main plane (S1) of a dielectric sheet (50) and a second shield conductor (30b) on a second main plane (S2). The first shield conductor (30a) includes parallel slits (32) formed in parallel with the longitudinal direction of one of the TM mode dielectric resonators, while the second shield conductor (30b) includes slits (31) formed in a region substantially opposed to the first slits (32). Further, a plurality of such dual TM-mode dielectric resonator apparatus described above are combined to form a band-pass filter.

Abstract: An electromagnetic resonator comprises an interior wall defining a substantially cylindrical cavity having a major axis. The interior wall includes first and second coupling grooves substantially parallel to the major axis. For a lesser level of coupling, the coupling grooves may be shorter than the length of the resonator and/or the second coupling groove may be omitted.

Abstract: An inductive tuning disk for tuning a resonant frequency of a resonator of a microwave filter. The microwave filter includes a housing that encloses a cavity and a resonator therein. The resonator exhibits a magnetic field that appears in the cavity. The inductive tuning disk includes a dielectric base which is supported from a top wall of the housing by a support, and which is disposed within the cavity at an adjustable height above the resonator. The inductive tuning disk further includes an inductor ring which is disposed over a portion of a top surface of the dielectric base, and which is spaced apart from a center of the base. The inductor ring includes an electrically conductive material. The inductor ring interacts with the magnetic field to cause a resonant frequency of the resonator to vary as a function of the adjustable height. The disk may also be used to couple the magnetic energy between a pair of resonators of a filter.

Abstract: A dielectric resonator apparatus includes a plurality of TM double-mode dielectric resonators. Each dielectric resonator has a dielectric rod-complex, a casing provided with electrically conductive film at the outside surfaces, and metal panels covering the upper and lower openings of the casing. In adjacent TM double-mode dielectric resonators, at portions of the planes of the two casings opposing each other, apertures are provided in the direction of the magnetic field generated by two dielectric rods which have the same axial direction. A coupling member is also provided so as to form an electrically conductive loop which goes across the magnetic field.