Abstract: A ceramic resonator radio frequency filter includes a printed circuit board, one or more first coaxial resonators disposed on the printed circuit board, and one or more second coaxial resonators disposed over the one or more first coaxial resonators so that the one or more first coaxial resonators and one or more second coaxial resonators are arranged in a stacked configuration. The one or more first coaxial resonators and second coaxial resonators electrically connected to the printed circuit board.

Abstract: A multiplexer includes: a first bandpass filter having a first end coupled to a common terminal and a second end coupled to a first terminal, the first bandpass filter having a first passband; a second bandpass filter having a first end coupled to the common terminal and a second end coupled to a second terminal, the second bandpass filter having a second passband that does not overlap with the first passband and is higher than the first passband; and a first band-stop filter having a first end coupled to the first terminal and a second end coupled to the second terminal, the first band-stop filter having a first stopband formed of a first attenuation pole and a second attenuation pole, the first attenuation pole being located within the first passband or near the first passband, the second attenuation pole being located within the second passband or near the second passband.

Abstract: This application relates to components of communications devices, and in particular, to a dielectric resonator and a dielectric filter, a transceiver, and a base station to which the dielectric resonator is applied. Embodiments of this application provide a dielectric resonator and a dielectric filter, a transceiver, and a base station to which the dielectric resonator is applied. The dielectric resonator includes a metal cavity and a dielectric block that is disposed in the metal cavity and that is made from a solid-state dielectric material; where sizes of the dielectric block meet c<b<a, where a, b, and c are respectively the sizes of the dielectric block in three dimensions in a three-dimensional coordinate system; a hole is disposed on the dielectric block; and a surface of the dielectric block is not metalized and is not in contact with the metal cavity.

Abstract: A dielectric resonator includes a dielectric block, an external conductor, and wall-surface conductors. The dielectric block has a rectangular parallelepiped shape including a first surface and a second surface opposed to each other. The dielectric block includes a through hole extending from the first surface to the second surface. The external conductor is disposed on an outer surface of the dielectric block. The wall-surface conductors are disposed on a wall surface defining the through hole. The wall-surface conductor includes a first portion of the through hole adjacent to the first surface and a second portion of the through hole adjacent to the second surface. The first and second portions of the wall-surface conductors are separated by a separation distance.

Abstract: A dual-mode dielectric resonator using two dissimilar modes is described, the dissimilar modes supported by a ridge waveguide resonator and a ½-wavelength metalized cylindrical resonator within a single, metal-coated dielectric block. Each ridge waveguide resonator and cylindrical resonator form a resonator pair. Multiple pairs of ridge waveguide/cylindrical resonators are fabricated in the same dielectric block to form an 8-pole dielectric resonator filter for 5G or other applications. Transmission zeros can be positioned by the location of feeding probes along the cylindrical resonators.

Abstract: A trap filter includes a first inductor, a second inductor, and a capacitor. A first end of the first inductor extends to a first connection portion, a third end of the second inductor is connected to a second end of the first inductor, and a fourth end extends to a second connection portion. The capacitor is connected in parallel with the second inductor. The first inductor and the second inductor are subtractive-polarity coupled. An inductance value of the second inductor is less than an absolute value of mutual inductance generated by coupling of the first inductor and the second inductor.

Abstract: A radio-frequency module (20) includes a module substrate (50) and a filter (21). The filter (21) has a sensitive GND electrode and a non-sensitive GND electrode that are connected to an external-connection ground terminal of the module substrate (50), and parallel-arm resonators. An inductance component generated by the sensitive GND electrode shifts, by a first shift amount, an attenuation pole that corresponds to a parallel-arm resonator and that is formed near a pass band. An inductance component generated by the non-sensitive GND electrode shifts, by a second shift amount, an attenuation pole that corresponds to a parallel-arm resonator and that is formed near the pass band. The first shift amount is larger than the second shift amount, and the distance between the sensitive GND electrode and the external-connection ground terminal is smaller than the distance between the non-sensitive GND electrode and the external-connection ground terminal.

Abstract: This application describes an example dielectric resonator and a filter. One example dielectric resonator includes a body and an encirclement wall, where the encirclement wall is saliently disposed on a surface of the body. The encirclement wall of the dielectric resonator encircles the surface of the body to form a cavity area, where the encirclement wall isolates the cavity area from external space of the encirclement wall.

Abstract: A high frequency switch (1) includes a first input/output terminal (30); at least three second input/output terminals (40a to 40e); a first switch (10) including a first common terminal (11) and at least two first selection terminals (12a to 12c) selectively connected to the first common terminal (11); and a second switch (20) including a second common terminal (21) connected to the first selection terminal (12c) with a matching circuit (50) interposed therebetween and at least two second selection terminals (22a to 22c) selectively connected to the second common terminal (21), in which the first common terminal (11) is connected to the first input/output terminal (30), the first selection terminals (12a and 12b) are connected to the second input/output terminals (40a and 40b), and the second selection terminals (22a to 22c) are connected to the second input/output terminals (40c to 40e).

Abstract: There is provided a branch circuit that comprises a first conductor and a second conductor as at least two branches from a predetermined branch point, a first stub connected to the first conductor at a first point, and a second stub connected to the second conductor at a second point, wherein the first point is a point where a length of a portion between the predetermined branch point and the first point of the first conductor is set to a first length determined in accordance with a characteristic of the first stub, and the second point is a point where a length of a portion between the predetermined branch point and the second point of the second conductor is set to a second length determined in accordance with a characteristic of the second stub and is different from the first length.

Abstract: This disclosure relates to radio frequency identification (RFID)-based communications technologies. In one aspect, a radio-frequency-based communications apparatus includes an antenna, a near field communication (NFC) radio frequency module and an electronic product code (EPC) radio frequency module separately connected to the antenna, an NFC processing module connected to the NFC radio frequency module, and an EPC processing module connected to the EPC radio frequency module. The NFC radio frequency module and the NFC processing module are configured to process signals transmitted according to one or more predetermined NFC protocols. The EPC radio frequency module and the EPC processing module are configured to process signals transmitted according to one or more predetermined EPC protocols.

Abstract: A cavity resonator assembly and filters formed from assemblies are provided. The resonator assembly comprising: a first resonator cavity, a first resonant member, and a first signal feed; a second resonator cavity, a second resonant member, and a second signal feed. The first resonant member is-located within the first resonator cavity, arranged to receive a signal from the first signal feed and configured to resonate within the first cavity at a first fundamental frequency. The second resonant member is-located within the second resonator cavity, arranged to receive a signal from the second signal feed and configured to resonate within the second cavity at a second fundamental frequency. At least a portion of the second cavity is housed within the first resonant member. The first resonator cavity surface from which the first resonant member extends is offset from a second resonator cavity surface from which the second resonant member extends.

Abstract: A band-pass filter includes five resonators. The five resonators are configured so that capacitive coupling is established between every two of the resonators adjacent to each other in circuit configuration. The first stage resonator and the fifth stage resonator are magnetically coupled to each other. The second stage resonator and the fourth stage resonator are capacitively coupled to each other. Each of the five resonators includes a resonator conductor portion. The respective resonator conductor portions of the first and fifth stage resonators are physically adjacent to each other. The respective resonator conductor portions of the second and fourth stage resonators are physically adjacent to each other. The respective resonator conductor portions of the first and second stage resonators are physically adjacent to each other. The respective resonator conductor portions of the fourth and fifth stage resonators are physically adjacent to each other.

Abstract: The present disclosure provides a frequency-converting super regenerative transceiver with a frequency mixer coupled to a resonator and a feedback element having a controllable gain. The frequency-converting super-regenerative transceiver utilizes the frequency mixer to shift the incoming frequencies, based on a controlled oscillator, to match the frequency of operation of the super-regenerative transceiver. The frequency-converting super-regenerative transceivers described herein permit signal data capture over a broad range of frequencies and for a range of communication protocols. The frequency-converting super-regenerative transceivers described herein are tunable, consume very little power for operation and maintenance, and permit long term operation even when powered by very small power sources (e.g., coin batteries).

Abstract: A wireless device including a coil having loops, a first reception circuit, and a second reception circuit. The first reception circuit is configured to receive a signal of a first frequency band through a portion of the loops and the second reception circuit configured to inhibit the signal of the first frequency band through the loops.

Abstract: The present applications at least describes a method of making a tuned ceramic filter. The method includes printing an oversized pattern of ceramic material on a ceramic filter. The method also include removing, at a first tune location of the ceramic filter, a first amount of the ceramic material using a laser to shrink the oversized pattern. The method also includes comparing a coupling matrix of the ceramic filter after the removing step with a coupling matrix of a prototype of the ceramic filter. The method includes a step of generating a tune vector based upon a difference between the coupling matrix of the ceramic filter and the coupling matrix of the prototype filter. Further, the method includes a step of iteratively modifying the removing of the ceramic material using femto-second laser at the first tune location to have a coefficient of the tune vector corresponding to the first tune location to converge toward zero.

Abstract: Embodiments of the present invention relate to the communications field, and provide a radiating element of an antenna and an antenna. The radiating element includes: a reflection module, a power feed PCB disposed on the reflection module and electrically connected to the reflection module, and a radiating module disposed on the power feed PCB and electrically connected to the power feed PCB. A first surface of the power feed PCB includes a first signal cable and a grounding area of the radiating module. A second surface of the power feed PCB includes a grounding area of the power feed PCB and a second signal cable. The first signal cable is electrically connected to the second signal cable. The grounding area of the radiating module is electrically connected to the grounding area of the power feed PCB.

Abstract: The present invention provides filter assemblies, tuning elements and a method of tuning a filter. A filter assembly includes a housing having a top cover, a bottom cover and at least one sidewall, the top cover, the bottom cover and the at least one sidewall defining an internal cavity, the housing configured to receive first through third radio frequency (“RF”) transmission lines; a top metal sheet mounted within the internal cavity that has a plurality of openings that form a first hole pattern; and a bottom metal sheet mounted within the internal cavity that has a plurality of openings that form a second hole pattern. The top and bottom metal sheets are vertically spaced-apart from each other in a vertically stacked relationship within the internal cavity. The top metal sheet and the bottom metal sheet each include at least one resonator.

Abstract: A wave separator includes an n number (n being a natural number of 3 or larger) of band pass filters having an n number or larger of mutually different pass bands, and a common terminal. For a first of the band pass filters that is one of a band pass filter having a center frequency of a pass band at a lowest side and a band pass filter having a center frequency of a pass band at a highest side and that has a larger or equal difference in a center frequency of a pass band from an adjacent band pass filter as compared with the other band pass filter satisfies a predetermined configuration for a second band pass filter having a pass band adjacent to the first band pass filter.

Abstract: A radio-frequency transceiver circuit, comprising: a first port and a second port, configured to receive, together, a pair of differential signals; a radio-frequency matching circuit communicatively coupled to the first port and the second port, and configured to process the pair of differential signals to obtain a radio-frequency signal and configured to increase transmission power for the radio-frequency signal, wherein the radio-frequency matching circuit includes at least one capacitor, at least one distributed inductor; a band pass filter circuit, communicatively coupled to the radio-frequency matching circuit and configured to filter the radio-frequency signal, wherein the band pass filter circuit includes at least one capacitor and at least one distributed inductor; and a third port, communicatively coupled to the band pass filter circuit and configured to output the filtered radio-frequency signal, wherein both of the at least one distributed inductors have a length of microstrip line.

Abstract: In one example an apparatus is provided. The apparatus includes a low frequency radiator, a high frequency radiator, a high frequency waveguide that carries high frequency bands to the high frequency radiator, a low frequency coaxial waveguide coupled to the high frequency waveguide in a coaxial structure, wherein the low frequency coaxial waveguide carries low frequency bands to the low frequency radiator and a low frequency combiner in communication with the low frequency coaxial waveguide, wherein the low frequency combiner comprises a circular low frequency waveguide and air dielectric transmission lines formed by air channels formed above and below a plurality of printed circuits in a metal housing.

Abstract: A multilayer filter includes an element body formed by stacking a plurality of insulator layers, and an input terminal, a first output terminal, and a ground terminal arranged on outer surfaces of the element body, a first LC resonance circuit provided in a line connecting the input terminal to the first output terminal and including a first inductor and a first capacitor, and an open inductor having one end connected to the ground terminal and the other end open are provided in the element body, and the open inductor is arranged to face the first output terminal or the first inductor.

Abstract: An exponentially tapered slot antenna assembly includes a plurality of antenna panels arranged together in a general box-like configuration. At each corner of the box-like configuration, a capacitive load panel is in operative electrical communication with orthogonal pairs of antenna panels. Each antenna panel defines an inner and outer surface and has an electromagnetic interference shielding material positioned thereon. The shielding material positioned may be positioned near a first or upper edge of each antenna panel of the assembly. It has been empirically determined that this configuration enables an operational bandwidth that is greater than 5:1 and a voltage standing wave ratio that is less than 3:1 over the 5:1 bandwidth.

Abstract: A ceramic monoblock RF filter for the transmission of an RF signal comprising a block of dielectric material including opposed top and bottom surfaces, opposed longitudinal side surfaces, and opposed transverse side surfaces. A plurality of spaced apart through-hole resonators extend through the block and terminate in openings in the top and bottom surfaces of the block. A second plurality of grounded RF signal blocking through-holes extend through the block and terminate in respective openings in the top and bottom surfaces of the block. The grounded through-holes are located and positioned in a relationship off-set and on opposite sides of the first plurality of through-hole resonators for blocking the coupling of the RF signal between RF signal input/outputs and selected ones of the first plurality of resonators and also between non-adjacent ones of the first plurality of resonators.

Abstract: The present application is directed to a filter and methods of making the same. The filter includes a block of dielectric material with a top surface including a patterned region, a bottom surface, and side surfaces. The filter also includes a through-hole extending through the block from the top surface to the bottom surface. The through-hole is partially surrounded by the patterned region. The filter also includes a wall extending from the top surface, the wall having an inner surface, an outer surface, and a roof. The bottom surface, side surfaces, outer surface, and roof have a first coating of silver and glass frit. The patterned region, through-hole and inner surface have a second coating of silver and glass frit. The glass frit in the first coating is at least 0.5% greater than the glass frit in the second coating. The application is also directed to a system including a printed circuit board and a filter.

Abstract: A microwave frequency magnetic field manipulation system 10 comprises a re-entrant microwave cavity 12 having a substantially continuous and closed internal surface 14 with at least two opposite sides 16 and 18. Two or more posts, P1, P2, . . . Pn (hereinafter referred to in general as “posts P”) are provided in the cavity 12. The posts P are in physical and more particularly electrical contact with one of the sides 16. Respective gaps G are or can be formed between free ends of the posts P and the side 18. The system 10 also has a signal source 20 coupled to the cavity 12 for supplying microwaves. The source 20 supplies microwave signals at frequencies that facilitate the generation of magnetic fields in opposite directions about at least two mutually adjacent posts P. Accordingly the magnetic field is reinforced in a common region 22 between the mutually adjacent posts P.

Abstract: A dielectric waveguide includes a dielectric of a rectangular parallelepiped in shape, an input/output electrode formed on a first face of the dielectric, and a conductor film formed on an outer face of the dielectric. The input/output electrode extends from a first end which is a vertex or a neighborhood of the vertex of a first face (bottom face) of the dielectric inward on the bottom face; and environs along both sides and the first end of the input/output electrode include a conductor-unformed section in which there is no conductor film.

Abstract: Embodiments of the present invention disclose a microstrip multiplexer, including a feeder, multiple microstrip filters, and a signal processing network. The multiple microstrip filters are separately connected to the signal processing network, and the signal processing network is connected to the feeder. Output signals of the microstrip filters of the multiple microstrip filters are combined by using the signal processing network and then output by using the feeder and/or a signal input from the feeder is split by using the signal processing network and then output to the microstrip filters. In the embodiments of the present invention, a wideband multiplexer that combines multiple wide subband signals for using can be implemented, and each subband has good frequency band response.

Abstract: A radar system with frequency scanning beam steering is described for in-vehicle occupant detection and classification for seat-belt reminder functionality (SBR) and airbag suppression. The system includes an antenna system for which the main lobe direction (azimuth angle ö) is changing mostly linearly over frequency, a RF electronic transceiver electronic with at least one transmit channel and one or multiple receive channels with two outputs (I/Q) per channel. The data acquisition and signal processing/interpretation are made by a microcontroller system.

Abstract: Apparatuses, systems, and methods of wireless power transmission/reception are described. In one wireless power transmission/reception device, a planar resonator capable of generating magnetic fields has one or more ferrite members mounted thereon such that the magnetic fields generated by the planar resonator have an overall direction substantially tilted or parallel to its opening/face, i.e., to the plane of the planar resonator. In a wireless power reception device, the planar resonator generates magnetic fields and an induced current when being resonated by external magnetic fields; in a wireless power transmission device, the planar resonator generates magnetic fields when being supplied with power.

Abstract: Flipped radio frequency (RF) and microwave filters and components for compact package assemblies are provided. An example RF filter is constructed by depositing a conductive trace, such as a redistribution layer, onto a flat surface of a substrate, to form an RF filter element. The substrate is vertically mounted on a motherboard, thereby saving dedicated area. Multiple layers of substrate are laminated into a stack and mounted so that the RF filter elements of each layer are in vertical planes with respect to a horizontal motherboard, providing dramatic reduction in size. Deposited conductive traces of an example flipped RF filter stack provide various stub configurations of an RF filter and emulate various distributed filter elements and their configuration geometries. The deposited conductive traces also form other electronic components to be used in conjunction with the RF filter elements. A wirebond or bond via array (BVATM) version provides flipped RF and microwave filters.

Abstract: A resonator, a filter, a duplexer, and a multiplexer are disclosed. In an embodiment a resonator includes a resonant cavity casing having a resonant cavity and an open end, a cover covering the open end and being connected to the resonant cavity casing and a resonance tube located inside the resonant cavity. The resonator further includes a tuning rod disposed inside the resonance tube and a dielectric material located in the resonant cavity, wherein the dielectric material is located in a capacitance area formed between a top of the resonance tube and the cover, wherein the tuning rod is rotatable relative to the dielectric material, and wherein surfaces of the tuning rod and the dielectric material face each other and comprise non-circular structures so that an overlapping of the surfaces is changeable to adjust a frequency when the tuning rod is rotated relative to the dielectric material.

Abstract: A noise filter inserted between the power source side and the load side of a main circuit for which noise is reduced to attenuate noise of the main circuit using a filter circuit including the coil and the capacitor. In the noise filter, the board ground pattern is separated into a plurality of board ground patterns, the separated board ground patterns are connected to a common ground member present outside the board, the separated board ground patterns are formed as solid patterns, and adjacent board ground patterns of the separated board ground patterns are disposed so as to have a spacing equal to or less than a predetermined distance.

Abstract: A method of operating a radio frequency (RF) module includes filtering, by a substrate integrated waveguide (SIW) band-pass filter, an RF signal propagating between an antenna and an interface structure. The antenna is disposed at a first side of a substrate. The interface structure is disposed at a second side of the substrate opposite the first side The SIW band-pass filter is disposed within the substrate between the antenna and the interface structure. The method of operating the RF module further includes transferring, by the interface structure, the RF signal between the SIW band-pass filter and an RF front end circuit.

Abstract: [Problem] To provide a cross coupled band-pass filter that reduces a loss of a signal due to a dielectric loss and enables a resonance frequency to be easily changed. [Solution] A cross coupled band-pass filter of the present invention includes an input waveguide, an output waveguide, and three or more stages of resonators that connect the waveguides together, in which the three or more stages of resonators is formed using a filter element, one or multiple pairs of resonators of the three or more stages of resonators adjoin via a shared tube wall and include an opening in the shared tube wall, an antenna that connects the one or multiple pairs of resonators together in the opening, and one or more stages of unconnected resonators between the one or multiple pairs of resonators in a waveguide path of electromagnetic waves.

Abstract: A wave separator includes an n number (n being a natural number of 3 or larger) of band pass filters having an n number or larger of mutually different pass bands, and a common terminal. For a first of the band pass filters that is one of a band pass filter having a center frequency of a pass band at a lowest side and a band pass filter having a center frequency of a pass band at a highest side and that has a larger or equal difference in a center frequency of a pass band from an adjacent band pass filter as compared with the other band pass filter satisfies a predetermined configuration for a second band pass filter having a pass band adjacent to the first band pass filter.

Abstract: A resonator, a filter, a duplexer, a multiplexer, and a communications device that use the resonator, where the resonator includes a resonant cavity body that has a resonant cavity and an open end, a cover that covers the open end and that is connected to the resonant cavity body, and a resonant tube that is located inside the resonant cavity, a medium material is padded in a capacitor area in the resonant cavity and whose dielectric constant is greater than 1, the resonant tube includes a resonant tube body and an elastic structure that is combined with the resonant tube body, and the elastic structure provides elastic pressure in an axial direction of the resonant tube where the resonator may reduce a conductor loss and improve a power capacity, and has relatively low costs.

Abstract: An antenna device is provided. The antenna device may include a conductive radiator pattern formed on one surface of a dielectric substrate, an artificial magnetic conductor layer including at least one unit cell formed on the other surface of the dielectric substrate, and a shorting pin connected to the unit cell. The artificial magnetic conductor layer may be configured to form an induction current of the same phase with regard to a signal current flowing through the conductive radiator pattern.

Abstract: A mm wave circuit includes a multiplexer plate having first and second faces, and an output port in the first face. The mm wave circuit also includes a receiver having a receiver input port, the receiver being arranged on the first face and electrically earthed thereto, and an electrically insulating layer covering at least a portion of the first face, the electrically insulating layer having a top face spaced apart from the first face. The electrically insulating layer includes a via extending from the top face to the output port, the via having a via mouth arranged in the top face. The mm wave circuit also includes a receiving antenna at least partly covering the via mouth, the receiving antenna being connected to the receiver input port by a receive line.

Abstract: To provide a smaller-sized high frequency filter. In a high frequency filter according to an embodiment of the invention, two filter circuits each equipped with a first externally coupling capacitor having one end coupled to an input-output terminal, a wavelength shortening capacitor having one end coupled to other end of the externally coupling capacitor and having other end coupled to the ground potential, and a resonator having one end coupled to the other end of the externally coupling capacitor and the one end of the wavelength shortening capacitor, having other end coupled to the ground potential, and being formed of a distributed constant line. The two filter circuits are broadside-coupled to each other.

Abstract: A shell of an electronic device includes a base, two sidewalls, and a plurality of terminals. The base includes upper lateral and lower lateral surfaces opposite to each other. The two sidewalls are disposed at the upper lateral surface and are located separately at two opposite sides of the base. The two sidewalls are opposite to each other, with each sidewall having a surface that faces away from the base. The plurality of terminals is symmetrically arranged in order at the other opposite sides of the base and is embedded in the base. Each terminal includes an upper section and a lower section, with the upper section vertically extending upwards from the upper lateral surface, with the lower section horizontally extending outwards from the lower lateral surface, and with at least a portion of the lower section affixed flatly to the lower lateral surface.

Abstract: A power dividing circuit includes a power dividing input terminal, a high pass filtering module and a low pass filtering module. The power dividing input terminal divides a signal into two divided signals. The high pass filtering module includes two high pass filtering units. The low pass filtering module includes two low pass filtering units. Each divided signal is filtered by one of the two high pass filtering units and one of the two low pass filtering units.

Abstract: The first member and the second member include, when a line that connects a first port and a second port is denoted by a reference line, a first groove that has a central point on the reference line and extends in a direction that intersects with the reference line; a second groove that connects one end of the first groove and the first port; a third groove that connects the other end of the first groove and the first port and has a shape that is line symmetrical to the second groove with respect to the reference line; a fourth groove that connects the other end (FN2) of the first groove and the second port; and a fifth groove that connects one end (FN1) of the first groove and the second port and has a shape that is line symmetrical to the fourth groove with respect to the reference line.

Abstract: A duplexer includes a plurality of first resonators disposed along the transmission path of the transmitting signal; a plurality of second resonators disposed along the transmission path of the receiving signal; and a combining panel having an overlapped area between one of the plurality of first resonators which is disposed closest to an antenna and one of the plurality of second resonators which is disposed closest to the antenna, wherein each of said first resonators and said second resonators includes: a body comprised of dielectric material, and formed with a through hole penetrating unidirectionally, and a conducting layer formed on the cross-section of at least one side of the cross-sections of the both sides along the lengthwise direction of said body, and the surface of the wall of said through hole.

Abstract: A liquid crystal display includes first and second sub-pixels charged with the same voltage during a first period. The voltage charged in the second sub-pixel is decreased after the first period. Since the voltage level of the first sub-pixel is different from the voltage level of the second sub-pixel after the first period, liquid crystal molecules disposed corresponding to the first sub-pixel are aligned in a direction different from that of liquid crystal molecules disposed corresponding to the second sub-pixel. Thus, a side viewing angle of the liquid crystal display is improved.

Abstract: The present invention provides a method and apparatus to manipulate the mutual coupling and the correlation between the antennas (502, 504) on the handset (202) without the need to change the physical distance between them or to change their orientation. The manipulation in the mutual coupling and in the correlation is achieved using a circuit that is connected between the antennas' terminals (506, 508) and the terminals (510, 512) of the RF front end/power amplifier (514). This circuit can be fixed or tunable. The coupling control takes place between two transmitting antennas (502, 504) or two receiving antennas (502, 504).

Abstract: RF multiplexer circuitry includes a first signal path coupled between a first intermediate node and a common node, a second signal path coupled between a second intermediate node and the common node, first resonator circuitry coupled between the first signal path and ground, and second resonator circuitry coupled between the second signal path and ground. The first resonator circuitry is configured to allow signals within a first frequency pass band to pass between the first intermediate node and the common node, while attenuating signals outside of the first frequency pass band. The first resonator circuitry includes a first LC resonator. The second resonator circuitry is configured to allow signals within a second frequency pass band to pass between the second intermediate node and the common node, while attenuating signals outside of the second frequency pass band.

Abstract: A multiplexer including a housing including an antenna connector coupled to an antenna and a plurality of input and output connectors configured to receive or output a signal transmitted or received via the antenna according to a predetermined frequency band; a plurality of band pass filter units included in the housing and configured to pass a signal of a predetermined frequency band between the antenna connector and the plurality of input and output connectors; and a coupling unit including a plurality of feeding units to couple the antenna connector and the plurality of band pass filter units with one another.

Abstract: A radiofrequency filter exhibiting at least one resonant mode comprises: at least one cavity at least partially closed using conductive walls, having a cylindrical outer surface defined by a directing curve described by a generatrix and having a point of symmetry, an axis passing through a point of symmetry and parallel to the generatrix being a longitudinal axis of the cavity. At least one dielectric element is arranged in the cavity and comprises: a first portion having a thickness according to the longitudinal axis and a section according to a plane perpendicular to the longitudinal axis whose vertices are distributed according to a polygon, at least two vertices being short-circuited between them by the conductive walls of the cavity, via an electrical or radiofrequency contact between the vertices and walls, at least one pyramidal portion comprising an apex and a base coinciding with an extreme section of the first portion.

Abstract: Switched filter banks realized in a stacked arrangement.