Abstract: An artificial microstructure made of conductive wires includes a split resonant ring with a split, and two curves. The two curves respectively start from first end and the second end of the split resonant ring and curvedly extend inside the split resonant ring, where the two curves do not intersect with each other, and do not intersect with the split resonant ring.

Abstract: The present invention provides multi-resonator cavity filters in which one or more patch elements are introduced into the coupling apertures between resonators, reducing the strength of the electric field in the aperture gap while maintaining the coupling strength from resonator to resonator. This reduced field strength reduces the sensitivity of the resonators to gap-thickness variations, and allows use of the filter in high-power applications.

Abstract: A reconfigurable bandstop filter and methods of designing and reconfiguring the bandstop filter are disclosed. The reconfigurable bandstop filter includes a plurality of transmission lines each including a phase shifter. The reconfigurable bandstop filter further includes a signal input port having a phase shifter and a signal output port having a phase shifter. The signal input port and the signal output port is coupled to the plurality of transmission lines.

Abstract: Embodiments provide a novel fabrication method and structure for reducing structural weight in radio frequency cavity filters and novel filter structure. The novel filter structure is fabricated by electroplating the required structure over a mold. The electrodeposited composite layer may be formed by several layers of metal or metal alloys with compensating thermal expansion coefficients. The first or the top layer is a high conductivity material or compound such as silver having a thickness of several times the skin-depth at the intended frequency of operation. The top layer provides the vital low loss performance and high Q-factor required for such filter structures while the subsequent compound layers provide the mechanical strength.

Abstract: A cavity filter includes a first layer circuit board, a second layer circuit board and a middle layer circuit board locates between the first layer circuit board and the second layer circuit board. A plurality of resonators locates on the first layer circuit board. A plurality of resonating cavities is located on the second layer circuit board one-to-one corresponding to the resonators. A slot is defined on the middle layer circuit board. The resonators traverse through the slot and are placed in the resonating cavities to form a plurality of resonating units, and the plurality of resonating couple with the slot of the middle layer circuit board.

Abstract: A resonance device is disclosed. The resonance device in accordance with an embodiment of the present invention includes: a case including a first ground surface and a second ground surface which face each other; a stacked part formed inside the case by stacking a first conductive layer and a second conductive layer, wherein the first conductive layer is grounded to the first ground surface and the second conductive layer is separated from the first conductive layer without being grounded to the first ground surface; and a transmission layer connecting the second conductive layer to the second ground surface.

Abstract: A filtering apparatus includes a passband of a first-level unit which is formed by at least three coaxial filters covers a passband of a second-level unit which is formed by at least three dielectric filters, and a bandwidth of the first-level unit is twice the bandwidth of the second-level unit, so that when the coaxial filters are coupled to the dielectric filters, insertion loss of the coaxial filters is reduced, thereby reducing overall insertion loss of the filtering apparatus. By making a transmission zero of the first-level unit be located at a second harmonic frequency point of the second-level unit, the filtering apparatus can have high suppression on a second harmonic, thereby obtaining relatively desirable far-end suppression performance.

Abstract: A waveguide E-plane filter component comprising a first main part and a second main part which in turn comprise a corresponding first and second waveguide section part. The main parts are arranged to be mounted to each other, each waveguide section part comprising a bottom wall, corresponding side walls and an open side, where the open sides are arranged to face each other. The waveguide E-plane filter component further comprises at least one electrically conducting foil that is arranged to be placed between the main parts, said foil comprising a filter part that is arranged to run between the waveguide section parts, the filter part comprising apertures, in said foil.

Abstract: A broad band diplexer employing suspended strip-line capacitors is disclosed. The diplexer has a low pass filter circuit and a high band pass filter circuit. The high band pass filter circuit has a first set of conductive pathways formed on the first surface of a suspended dielectric substrate, a second conductive pathway formed on the second surface of the substrate such that first and second conductive pathways are capacitively coupled, and plural resonators. The high pass filter circuit provides plural transmission poles within the band of operation exceeding the number of resonators.

Abstract: A reconfigurable rat race coupler and methods of designing and reconfiguring the rat race coupler are disclosed. The reconfigurable rat race coupler, includes a plurality of transmission lines. The plurality of transmission lines include: a first transmission line and a second transmission line each of which comprise a phase shifter; and a third transmission line and a fourth transmission line each of which comprise phase shifters. A signal input on port 1 is provided between the phase shifters on the third transmission line, which is split between ports 2 and 3, with port 4 being isolated and port 2 being between the phase shifters on the fourth transmission line.

Abstract: A radio frequency filter (1) comprises an input impedance adaption section (2) and a tank capacitor section (3). Thereby, the capacity of the input impedance adaption section (2) does not comprise a fixed capacitor, it only comprises switchable capacitors. Further, the tank capacitor section (3) does not comprise a fixed capacitor as well it only comprises switchable capacitors. The capacity of the input impedance adaption section (2) can be tuned independent of the tank capacity, section capacity by means of switchable capacitors. Hence, bandwidth and frequency of the radio frequency filter can be modified independent of each other. The imput impendance adaption section (2) is connected in series between the input and output of the filter (1). The tank capacitor section (3) is shunt connected between the input-output series path of the filter (1) and ground.

Abstract: A dielectric resonator body for a multi-mode cavity filter, the resonator body including: a piece of first dielectric material, with at least one substantially flat face for mounting on a substrate, the piece of first dielectric material having a shape such that it can support at least a first resonant mode and at least one spurious response; and a layer of conductive material at least partially coating the resonator body; wherein the piece of first dielectric material includes at least one region having a different dielectric constant to the first dielectric material, whereby the presence of the region of different dielectric constant alters the frequency separation of the resonant mode and the spurious response.

Abstract: A multi-mode cavity filter having a dielectric resonator body incorporating a piece of dielectric material, the piece of dielectric material having a shape such that it can support at least two substantially degenerate resonant modes; and a coupling structure comprising a plurality of independent coupling elements for coupling signals to the piece of dielectric material.

Abstract: A multi-mode cavity filter, comprising: a dielectric resonator body incorporating a piece of dielectric material, the piece of dielectric material having a shape such that it can support at least a first resonant mode and a second substantially degenerate resonant mode; a conductive layer substantially covering the dielectric resonator body but having one or more apertures therein allowing access to the dielectric resonator body; and a coupling structure arranged in an aperture of the one or more apertures, comprising at least one coupling path for at least one of coupling an input signal to the first and second resonant modes and coupling an output signal from the first and second resonant modes, the coupling path having an open-circuit end located adjacent to an edge of the aperture for controlling a strength of electric field generated by the coupling structure.

Abstract: A cavity filter, including a dielectric resonator structure comprising a piece of dielectric material having a shape such that it can support a first resonant mode and a second resonant mode which is substantially degenerate with the first resonant mode; and a coupling structure for exciting a resonant mode within the piece of dielectric material or extracting energy from a resonant mode within the piece of dielectric material; wherein the coupling structure consists of a single patch element in contact with a surface of the piece of dielectric material, the patch element being arranged to couple directly to said first and second resonant modes simultaneously.

Abstract: A multi-mode cavity filter comprises a dielectric body having at least first and second orthogonal resonant modes; a first coupling element formed on a first face of the dielectric body for coupling energy to at least a first resonant mode; and a second coupling element formed on the first face of the dielectric body for coupling energy from the at least a first resonant mode. The dielectric body is capable of supporting a first coupling path between the first coupling element and the second coupling element via the at least a first resonant mode and a second coupling path between the first coupling element and the second coupling element, the second coupling path being such that at least partial cancellation of at least some coupled energy takes place so as to form a zero in a response of the filter.

Abstract: To provide a radio wave half mirror for a millimeter wave band which can flatten transmittance characteristics and a method of flattening the transmittance of the radio wave half mirror for a millimeter wave band. A radio wave half mirror 20 includes a metal plate 21 that has an outward shape closing a transmission line 11 and a slit 22 for transmitting electromagnetic waves that is provided in the metal plate 21 along a long side of an opening of the transmission line 11. The thickness L of the metal plate 21 in a direction in which the electromagnetic waves pass through the slit 22 is set on the basis of the transmittance characteristics of the electromagnetic waves.

Abstract: A radio-wave half mirror for millimeter waveband is fixed inside a transmission line propagating electromagnetic waves of millimeter waveband in a single mode so as to transmit a part of incident electromagnetic waves and reflect a part thereof. The radio-wave half mirror includes: a half mirror body where a slit for transmitting electromagnetic waves is provided on a metal plate; and a dielectric plate that is provided on one surface side of the half mirror body so as to form a dielectric resonator which resonates at a frequency determined by the thickness and the permittivity, and has a transmittance characteristic having a degree of inclination substantially the same as that of the half mirror body in a slope which is inverse to a slope of a transmittance characteristic of the half mirror body in a desired frequency range of the millimeter waveband.

Abstract: In one embodiment, the cavity filter includes a housing defining a cavity, and at least one post projecting from a first interior surface of the housing towards a second interior surface of the housing. The first interior surface faces the second interior surface. The cavity filter further includes a thermo electric cooler disposed on the housing. The thermo electric cooler is configured to one of cool and heat at least a portion of the housing.

Abstract: A fully integrated silicon-based bandpass filter which lends itself to applications in the gigahertz region is disclosed. The bandpass filter is fabricated on an integrated circuit and operates as a microwave/millimeter-wave filtering circuit. In accordance with one aspect, the bandpass filter includes a first set and a second set of filter coupled elements, a three-port “T” transmission line junction and a perturbing element. The three-port “T” transmission line junction has a first port coupled to a first end of a first one of the first set of filter coupled elements and a second port coupled to a first end of a first one of the second set of filter coupled elements. The perturbing element is coupled to a third port of the three-port “T” transmission line junction. A second one of the first set of filter coupled elements includes an input transmission line and has a first end thereof coupled to an input port and an opposite end thereof having an open end.