83 results about "Broadband impedance matching" patented technology

A dielectric polyrod having at least one tapered section, where a section exposed outside of the waveguide is tapered a long a curve that depends on the dielectric constant of the material used. The invention also relates to an aperture matched polyrod antenna which includes the same and an inductive tuning element used to achieve wideband impedance match and to create a Gaussian beam in the radiating near field of the antenna, suitable to mimic a small region plane wave.

Low-profile, compact embedded antenna designs are provided for use with computing devices, such as laptop computers, which enable ease of integration within computing devices with limited space, while providing suitable antenna characteristics (e.g., impedance matching and radiation efficiency) over a desired bandwidth of operation. Compact antenna designs with reduced antenna size (e.g., antenna height) and increased operational bandwidth (e.g., broadband impedance matching) are achieved using slotted ground plane designs and / or doubling antenna feeding schemes.

A high frequency and wide band impedance matching via is provided. As an application to multi-layer printed circuit boards, for example, the multi-layer circuit board has several signal transmission traces, several ground layers, signal transmission vias and ground vias. The signal transmission traces and the ground layers are sited on different circuit layers, and each signal transmission trace is opposite to one of the ground layers. The signal transmission vias are connected between the signal transmission traces. The ground vias are connected between the ground layers. The ground vias are opposite to the signal transmission vias, and the ground vias corresponding to the signal transmission vias are sited to stabilize the characteristic impedance of the transmission traces.

The invention relates to a coaxial-ridge waveguide-microstrip conversion structure ultra-broadband multi-channel power splitter. The input coaxial joint and the extended coaxial waveguide adopt a tapered coaxial gradual transition, and the tapered coaxial gradual transition And the ridge waveguide-microstrip conversion structure can realize ultra-wideband impedance matching; N ridge waveguide-microstrip conversion structures are uniformly distributed along the circumference in the extended coaxial waveguide to realize N-way parallel power division, and the entire power division circuit has axisymmetric To ensure that the signal amplitudes and phases of the N-channel power division signals are equal, the N-channel signal power division can be realized in one step, which can minimize the signal transmission loss. The present invention has ultra-wideband, low transmission loss, can realize any multi-channel power division output, each power division output signal has good amplitude and phase consistency, flat group delay characteristics in the band, and is easy to integrate with other peripheral planar circuits, etc. advantage. The invention is mainly used in microwave and millimeter wave power synthesis amplification systems, array antennas, etc., and has broad application prospects in microwave and millimeter wave systems such as communication and radar.

An integrated circuit (IC) system provides a broadband impedance matching function in a minimal IC area for operation with an external high-speed differential communications channel. The IC system includes a first semi-conductive substrate with a first face and an oppositely disposed second face substantially parallel to the first face. A second non-conductive substrate having substantially parallel first and second faces is arranged upon the first substrate so that the first face of the first substrate contacts the second face of the second substrate. An integrated semiconductor circuit (IC) is disposed in the first substrate and intended for differential high-speed communications operation with the external high-speed differential communications channel. First and second planar conductors are disposed in the second substrate to be electrically isolated from each other and from the first substrate, and arranged for maximum mutual magnetic additive coupling between them. The first terminal ends of the conductors present differential channel connections to the external differential communications channel that display an impedance at the circuit substantially equal to the external differential high-speed communications channel over a broad range of frequencies from DC to about 10 GHz.

Embodiments of the invention relate to the technical field of radio frequency impedance matching, and disclose a broadband impedance matching module and a device containing the same. The broadband impedance matching module comprises: an impedance matching network, M radio frequency (RF) switches, and an impedance matching device connected to each of the RF switches; wherein M is a natural number greater than or equal to 1; the M RF switches and the impedance matching device connected to each of the RF switches are all connected to the impedance matching network; the RF switches are all used toconnect to a control unit, and connect or disconnect the impedance matching device connected to each of the RF switches to or from the impedance matching network under the control of the control unit, so as to adjust the matching impedance of the broadband impedance matching module. By adopting the embodiments provided by the invention, the matching impedance can be adjusted according to actual needs, so that certain versatility is acquired, which is beneficial for improving the development efficiency of the RF front-end product.

The invention relates to a vehicle-mounted ultrashort wave wide antenna, which consists of a short radiator, a long radiator and a pedestal, wherein the bottom end of the short radiator or the long radiator is installed at the upper end of the pedestal; the short radiator consists of a radiator core, a matcher, a coupling and a glass reinforced plastic pipe; the radiator core is inserted into the upper end of the glass reinforced plastic pipe; the matcher is fixed at the middle part of the glass reinforced plastic pipe; the coupling is fixed at the lower end of the glass reinforced plastic pipe; the upper end of the matcher is connected with the lower end of the radiator core; and the lower end of the matcher is connected with the upper signal port of the pedestal. A broadband impedance matching technology is employed, the problem of antenna height is well solved and good broadband impedance matching is realized, so antenna radiation efficiency is effectively improved, and antenna gain is increased. In the invention, two radiators use a pedestal, the short radiator or the long radiator can be selected during the tactical operation in a wide zone, the short radiator can be selected during short-distance networking, or passing through bridges and tunnels and quick movement, so the antenna is convenient for the army to use to the full extent.

An inductive output tube (IOT) provides improved efficiency and larger bandwidth. In one embodiment, an IOT is provided with an electron gun that generates an electron beam, a tube body, a collector for collecting the electron beam, and an extended-interaction output circuit. The electron beam travels through the tube body and the extended-interaction output circuit. The extended-interaction output circuit is located within the tube body. The extended-interaction output circuit comprises a short-circuited resonant structure. The extended-interaction output circuit is used for reducing undesired components of a radio frequency (RF) wave, increasing desired components of the RF wave, and slowing down the propagation of the RF wave. (That is the circuit increases the integral of the electric field along the path of the beam electrons while decreasing the stored energy associated with those fields.) The extended-interaction output circuit also provides the IOT with larger bandwidth operation. The collector may be a multi-stage depressed collector having voltages on the collector to result in a constant efficiency characteristic. The radio-frequency drive power to the tube is connected by means of a broadband impedance matching transformer, and the grid to cathode capacitance may be reduced by depressions in the surface of the cathode directly underneath the grid structure.

A broadband impedance matching circuit using high pass and low pass filter sections alternatingly cascaded together to yield considerably broader band matching than two high pass sections or two low pass filter sections. By alternating the high pass filter sections with the low pass filter sections, significantly fewer elements are required for a given result than non-alternating prior art cascaded filter sections. Consequently, the alternating filter sections according to the present invention significantly improves the return loss at increased bandwidths.

The invention discloses a Q-band superspeed wireless local area network indoor access antenna which comprises a radiating element and a feeder line part. The radiating element and the feeder line part are printed on a same medium substrate through the printed circuit technology. The radiating element is formed by printed umbrella-shaped symmetrical dipoles and a printed guide unit, the substrate is used for integrating a waveguide to achieve differential feed, an inductive window structure is loaded to achieve broadband impedance matching, and mutual connection with an external circuit can be achieved through the antenna mode by adopting a coplanar waveguide changeover structure or a substrate integrated waveguide changeover structure. Considering the requirements of the new generation Q-band superspeed wireless local area network standard and the related millimeter wave indoor communication system standard 802.11aj (45GHz), the access antenna which is provided with a wide working band (42.4-48.5 GHz), and wide beam coverage larger than or equal to 120 degrees in a main tangent plane and is capable of being integrated with a plane active millimeter wave circuit is achieved through the printed circuit technology.

The invention relates to the field of an optical communication technology and provides a broadband radio frequency modulation circuit of a laser. The circuit comprises a peaking inductor, a depletion type FET (field effect transistor) geminate transistor, a broadband impedance matching circuit, a broadband Bias-T circuit, an impedance transmission line and a matching resistor. In the technical scheme, as the broadband impedance matching circuit is used, the impedance matching can be flexibly reduced, thus realizing non-loss transmission of a radio frequency signal, achieving the high-efficiency modulation of the laser within a frequency range from 0.45GHz to 10GHz, and well meeting the requirement of an RoF (radio-over-fiber) system on transparent transmission of radio frequency bands of GSM (Global System For Mobile Communication), WCDMA (Wideband Code Division Multiple Access), 802.11a / b / g, WiMax, LTE and the like in the next-generation wireless communication system.

The invention discloses a method using non Forster circuit high frequency response to carry out broadband impedance matching. An electrically small size antenna is connected with a non Forster module. The negative reactance characteristic on the right side of a non Forster module frequency response resonant point is used to compensate the high frequency reactance of the electrically small size antenna, so as to realize broadband impedance matching at a high frequency position. When the traditional non Forster module is applied to the electrically small size antenna, reactance compensation is carried out simply through low frequency response, which has the defect that broadband impedance matching cannot be realized in high frequency. According to the invention, a negative reactance region on the right side of the non Forster module frequency response resonant point is used to realize reactance compensation of the electrically small size antenna, and high frequency broadband matching is realized.

The invention discloses a resonance enhanced type broadband impedance matching circuit and a matching method. The matching circuit comprises an impedance transformation network and a resonance compensating network which are in cascade connection with an initial circuit in sequence, wherein the impedance transformation network comprises a resistor Z1 and an impedance Z2 which are connected in parallel; the resonance compensating network comprises impedance Z3 to Z4 which are connected in series. The impedances Z1, Z3 to Z4 are realized by a microstrip line. Parameters of the impedance transformation network are determined by low frequency end matching conditions of the initial circuit; the parameters of the resonance compensating network are determined by high frequency end matching conditions of the initial circuit. The matching method comprises the following steps: firstly, accessing the impedance transformation network and regulating the parameters of the impedance transformation network to realize low frequency end matching; then, accessing the resonance compensating network and regulating the parameters of the resonance compensating network to realize high frequency end matching. According to the resonance enhanced type broadband impedance matching circuit and the matching method, the defects in a conventional compensation technology purely using lumped parameter or distribution parameters are compensated, the matching circuit under required frequency band width is conveniently realized, and the broadband impedance matching is realized.

The invention discloses a switchable antenna of a near and far field RFID reader-writer, and a design method of thereof. The antenna is an antenna of a double-faced microstrip line feed network structure and comprises two feed ports used for switching near and far field working modes, a dipole array structure, metal through holes, an integrated resistor and a dielectric substrate; the dipole array structure comprises a square ring composed of four dipole antennas, wherein each dipole antenna is separately fed by a 1 / 4 impedance transformation structure; six metal through holes are formed, wherein four metal through holes are separately connected with the dipole array structure through the double-faced microstrip line feed network structure (QDSPSL), and the other two metal through holes are welded with a coaxial feed inner core; and the integrated resistor is integrated with the feed port in a far field working mode and is used for realizing broadband impedance matching of the antenna in the far field working mode. According to the switchable antenna disclosed by the invention, the working mode of the RFID reader-writer antenna is switched through the feed point position, the single working mode of the traditional antenna is overcome, and the application cost can be greatly reduced.

The invention provides an ultra-wideband half-folding antipodal gap antenna and a preparation method thereof, which is characterized in that a printing circuit board process is used for respectively designing a top layer subsplit and a bottom layer subsplit with gradually changed shapes on the frontal surface and the bottom surface of a medium substrate; the top layer subsplit and the bottom layer subsplit are respectively arranged at two sides of the medium substrate; the top layer subsplit and the bottom layer subsplit 3 are connected with each other by a metal via-hole so as to form a complete half-folding antipodal split; a micro-strip feed wire and a rectangular bonding sheet tune branch are connected with each other by a ladder resistance conversion structure 5 so as to form the wideband feed structure of an antenna, thus realizing effective wideband resistance matching characteristic. The ultra-wideband half-folding antipodal split antenna and the preparation method thereof have the advantages that the crossing polarization characteristic of the antenna is good, the ultra-wideband half-folding antipodal split antenna can be used for the polarization collecting unit of the multi-antenna system, the structure is simple, additional feed part is not required, the preparation process is simple, the integration is convenient and the cost is low.

The invention belongs to the technical field of electronic switches, and particularly relates to a broadband single-pole single-throw switch and a broadband single-pole multi-throw switch based on a transformer. The single-pole single-throw switch comprises a first switch transistor and a second switch transistor, wherein a small on-resistance is presented when the first switch transistor and thesecond switch transistor are conducted, and a turn-off capacitor is presented when the first switch transistor and the second switch transistor are turned off; the transformer and the turn-off capacitor jointly form a broadband impedance matching network when the two switch transistors are turned off; and the quarter-wave transmission line is used for converting the small on-resistance when the second switch transistor is conducted into high real impedance. According to the invention, the broadband single-pole single-throw switch can be realized, the single-pole single-throw switch is turned off when the two switch transistors are turned on, and the single-pole single-throw switch is turned on when the two switch transistors are turned off; the single-pole single-throw switches are connected in parallel to form a single-pole multi-throw switch; when the broadband single-pole single-throw switch and the broadband single-pole multi-throw switch are conducted, the broadband single-pole single-throw switch and the broadband single-pole multi-throw switch have relatively wide radio frequency bandwidth and also have the functions of direct current isolation and broadband matching.

The invention relates to semiconductor devices, and discloses a wideband low noise amplifier. The wideband low noise amplifier utilizes a cross coupling transistor network as a wideband impedance matching network, can achieve characteristics similar to pure resistance in a wide frequency band, is simple in circuit structure, and achieves good wideband impedance matching performance on the premise that noise is not eliminated, namely achieves simultaneous optimization of noise performance and wideband performance. Compared with a traditional low noise amplifier, the wideband low noise amplifier avoids a radio frequency inductor, largely lowers the size of a chip, and can reduce the size of the chip by more than 80%.

According to the invention there is provided an interconnect for bi-directionally coupling together a coaxial transmission line and a coplanar waveguide. The interconnect is adapted to provide a transition region between the coaxial transmission line and the coplanar waveguide, which induces a smooth transition from the electric field of the coaxial transmission line to the electric field of the coplanar waveguide as well as broadband impedance matching between the coaxial transmission line and coplanar waveguide.

The invention discloses an electroacoustic transduction system and an impedance matching control method thereof. The electroacoustic transduction system comprises a power amplifier; the power amplifier is connected with the impedance matching circuit; and the impedance matching circuit is connected with a load. The impedance matching circuit comprises two thyristors which are reversely connected in parallel; the two antiparallel thyristors are connected with the inductor in series to form a series branch; and the series branch is connected with the capacitor in parallel. According to the invention, broadband and high-precision dynamic adaptive impedance matching can be realized under different voltage output frequencies and amplitudes of the power amplifier and different load impedance conditions, so the problems of limited power transmission and low power factor caused by inconsistent impedance of the digital power amplifier and the electroacoustic transducer are solved; the dynamic self-adaptive broadband impedance matching is realized, so the operation efficiency of the electroacoustic transduction system can be improved.

The invention discloses a millimeter wave broadband circular polarized antenna based on a substrate-integrated waveguide horn, and aims to solve the problem of difficulty in realizing broadband circularly polarization in an existing substrate-integrated waveguide horn antenna. The millimeter wave broadband circularly polarized antenna comprises a dielectric plate (1), an upper metal layer (3), a lower metal layer (4), an upper dielectric block (5), a lower dielectric block (6), a polarized converter (7) and a polarized converter support structure (8), wherein the upper metal layer and the lower metal layer are located on an upper surface and a lower surface of the dielectric plate respectively; the dielectric plate is provided with a metallized through hole array (2) with gradually-varyinggaps in order to construct a feed-horn structure; the upper dielectric block and the lower dielectric block are arranged above and below a horn radiation aperture respectively to realize broadband impedance matching; and the polarized converter and the support structure thereof are located at the edge of the horn radiation aperture to realize stable broadband circularly polarized radiation. The millimeter wave broadband circular polarized antenna has the advantage of circularly polarized radiation with stable broadband under the millimeter wave frequency, and is suitable for a broadband millimeter wave wireless communication system.

The invention relates to a digital transmission broadband impedance matching network and a design method thereof. The matching network comprises a first resonant circuit, the first resonant circuit comprises a first inductor and a first capacitor, and the first inductor and the first capacitor are connected in parallel or in series and then are connected between a device to be matched and a terminal. The method comprises the steps of acquiring a first impedance trajectory of a first reflection coefficient of the device to be matched on a Smith chart, and designing the digital transmission broadband impedance matching network capable of curling or twisting the first impedance trajectory according to the positional relationship of the first impedance trajectory and a preset echo loss circle,wherein the matching network comprises a first resonant circuit formed by the first inductor and the first capacitor, and when the impedance match of the device to be matched is carried out, the first inductor and the first capacitor are connected in parallel or in series and then are connected between the device to be matched and the terminal. Through the above matching network and the design method thereof, the impedance matching bandwidth of the device to be matched is expanded, and the impedance matching effect is improved.

Disclosed is an internal antenna providing impedance matching for a wide band where a feeding patch is placed on a substrate. The disclosed antenna may include: a substrate; an impedance matching / feeding unit including a feeding patch, which is formed on the substrate and electrically connected to a feeding point, and a ground patch, which is electrically connected to a ground and formed above the feeding patch separated at a designated distance from the feeding patch; and a radiator formed extending from the ground patch, where the impedance matching / feeding unit performs impedance matching by way of coupling between the feeding patch and the ground patch, and the radiator receives coupling feeding from the feeding patch. The disclosed antenna has the advantages of overcoming the narrow band problem of a planar inverted-F antenna, and of allowing more efficient utilization of space in an internal antenna for a wide band using coupling matching and coupling feeding.

The invention discloses a micro ultra wide band omnidirectional fractal paster antenna. The antenna comprises a metal radiation paster, an interface layer medium plate and a metal ground plate, wherein the interface layer medium plate is arranged between the metal radiation paster and the metal ground plate, the metal radiation paster comprises a circular paster and a microstrip feed line, the center of the circular paster is taken as a circular groove, the polygon groove is embedded in an axisymmetric structure mode to form a fractal structure to make the antenna have multi-frequency characteristics, a lower small portion of the top portion of the circular paster is transversely sectioned and removed to reduce antenna dimensions, and the metal ground plate is formed by grooving a rectangular metal paster to facilitate broadband impedance matching. The antenna is advantaged in that properties of simple and novel structure, small dimensions, stable directional diagram, good omnidirectivity, wide bandwidth and easy processing are realized, and the antenna can be applicable to mobile communication and radio frequency identification fields.

The invention provides a broadband low-profile dual circularly polarized planar antenna. The broadband low-profile dual circularly polarized planar antenna comprises a horizontal and vertical waveguide converter, a broadband dual polarized power divider, a broadband complementary phase shifter and a low-profile four-ridge horn from bottom to top, the broadband dual-polarization power divider is used for realizing two pairs of equiamplitude orthogonal in-phase guided wave output; the broadband dual-polarization power divider comprises an orthogonal mode coupler cavity, a cross-shaped gap cavityand a four-ridge power divider cavity, wherein the orthogonal mode coupler cavity is provided with corner cut structures, the four-ridge power divider cavity is provided with corner cut structures ontwo sides of a ridge, the broadband complementary phase shifter comprises a pair of + 45-degree phase shifters and a pair of-45-degree phase shifters, and the low-profile four-ridge horn realizes broadband impedance matching between the broadband complementary phase shifter and air by using the four-ridge structure; broadband impedance matching and dual circularly polarized radiation performanceof the double-end input port under the same frequency band are realized while low profile is realized, and the antenna can also be used as a basic composition unit of a large-scale dual circularly polarized array antenna.

A low-profile broadband multiple antenna, comprises: a dipole arranged in the top part of said antenna, said dipole comprising at least one first top antenna element connected to the core of a multi-axial cable comprising a core and n sheaths and the bottom individual element of which is connected to the first sheath adjacent to the core, a connection device positioned between a top element of a dipole and the bottom element of said dipole the top element is connected to the sheath of index (k−1) of the multi-axial cable after the assembly comprising the core and the sheaths of index (1 to k−1) has been wound in Q turns around a magnetic core and the bottom element of the dipole is connected to the sheath of index k, and said connection device comprises at least one single-wire winding of P turns on the same magnetic core linking said bottom element of said dipole to the sheath of index (k−1), at the point corresponding to the start of the winding in order to provide the broadband impedance matching and the power supply for the dipole.

The invention discloses a dual-mode ultra-wideband high-efficiency power amplification circuit. The power amplification circuit has two working modes of high-power output and low-power output, and the two working modes work in the same frequency band. According to the dual-mode working ultra-wideband matching network, a switch tube core serves as a switching element to be fused into a common output matching network of two modes, and large and small power mode switching of the output matching network of the amplifying circuit is achieved by means of the two different states of switching-on and switching-off of a switch. And meanwhile, in order to realize ultra-wideband impedance matching, the large power amplifier adopts a matching form of a multi-order inductance-capacitance low-pass network and a parallel inductor ground, and the inductance value of the parallel inductor can be changed along with switching of a switch in order to adapt to different modes. According to the amplifying circuit, the efficiency of the ultra-wideband power amplifier in a high-power mode is effectively improved through fusion design.