36results about How to "Improve intermodulation performance" patented technology

The present invention is an RF filter that translates impedances of an IF circuit to create a filter with an RF center frequency having the high Q roll-off characteristics of an IF filter. The RF filter is self-aligned with the frequency of an RF local oscillator. The RF filter has an impedance divider, which is formed by coupling an RF impedance circuit to a translated IF impedance circuit. The translated IF impedance circuit includes an RF passive mixer and an IF impedance circuit. The mixer translates the impedance of the IF impedance circuit by mixing an RF input signal with an RF local oscillator signal, which determines the RF center frequency. Filtered RF signals may be provided by the impedance divider. Filtered IF signals may be provided by the IF impedance circuit. To effectively translate and preserve the IF impedance characteristics, the IF impedance circuit presents a high impedance at harmonics of the RF local oscillator signal.

The invention provides an integrated multipath dielectric phase shifter. The integrated multipath dielectric phase shifter comprises a cavity (10), a first dielectric plate (301), a second dielectric plate (302) and a PCB (90), wherein holes are formed in the two ends of the cavity (10); guide rail grooves are respectively formed in the two side walls of the cavity (10); the PCB (90) is fixedly arranged in the cavity (10) through the guide rail grooves; feeder lines (80) are symmetrically attached to the upper surface and the lower surface of the PCB (90); metallized via holes (11) are formed inside the PCB (90); the first dielectric plate (301) and the second dielectric plate (302) are symmetrically arranged, respectively cover the upper surface and the lower surface of the PCB (90) and slides in the longer side wall direction of the cavity; through holes corresponding to the feeder lines (80) are formed in the first dielectric plate (301) and the second dielectric plate (302). The phase shifter disclosed by the invention is low in profile, small in size, less in parts and high in erecting welding consistency.

The invention discloses a broadband slot antenna unit, which comprises a patch layer, wherein a first radiation slot and a second radiation slot are formed in the patch layer, the shapes of the firstradiation slot and the second radiation slot are polygonal, and the first radiation slot and the second radiation slot are connected with a feed terminal. The antenna unit adopts a planar patch structure, has the advantages of simple structure, easy production and manufacturing, low cost, long feed transmission distance and excellent feature of ultra-wideband. The invention further provides a slotantenna, which comprises an antenna unit array formed by the broadband slot antenna units which are reasonably distributed, and the spacing between the antenna units determines the beamwidth of the antenna horizontal plane. The slot antenna has the advantages of high gain, good isolation effect and low cost, and can used as a community beautification spotlight antenna or other base station antenna.

The invention discloses a pushing-in self-locking clustering radio-frequency coaxial connector assembly. The coaxial connector assembly comprises a clustering male joint radio-frequency coaxial connector and a clustering female joint radio-frequency coaxial connector; the clustering male joint radio-frequency coaxial connector comprises a male joint base body and an unit male joint connector; the clustering female joint radio-frequency coaxial connector comprises a female joint base body, an unit female joint connector and a back nut; a plurality of rolling ball holes are formed in the barrel body at the front end of the male joint base body in a circumferential direction; a rolling ball is movably embedded in each rolling ball hole separately; the clustering female joint radio-frequency coaxial connector also comprises a cylindrical push-pull sleeve; an inner stage is arranged on an inner hole in the front end of the barrel body of the push-pull sleeve; the inner stage has an outwardly-opened conical opening and an inwardly-tilted inward inclination front end plane; a groove is formed in the inner hole in the back end of the barrel body of the push-pull sleeve; and a spring is placed in the groove. The pushing-in self-locking clustering radio-frequency coaxial connector assembly can be locked tightly and automatically without pulling the push-pull sleeve backwardly by a hand in mutual matching; and the push-pull sleeve has dual functions of locking and unlocking, so that the locking force is higher, and higher convenience in operation can be realized.

A method and apparatus for reducing intermodulation distortion is disclosed. In one embodiment, the method comprises the steps of accepting a sampled input signal V(t) wherein the input signal V(t) comprises a plurality of peaks; determining n peaks Vp<sub2>1< / sub2>,Vp<sub2>2< / sub2>, . . . Vp<sub2>n < / sub2>of the sampled input signal V(t) exceeding a clip value Vclip at times t1, t2, . . . tn; and modifying the sampled input signal V(t) by weighting the n peaks Vp<sub2>1< / sub2>,Vp<sub2>2< / sub2>, . . . ,Vp<sub2>n < / sub2>exceeding the clip value Vclip of the sampled input signal V(t) by a function b(t) wherein b(t) is either a hard limiting function or b(t)=f(a1, a2, . . . an;t−tp<sub2>1< / sub2>,t−tp<sub2>2< / sub2>, . . . t−tp<sub2>n< / sub2>), wherein a1,a2, . . . an are weight values corresponding to the n peaks Vp<sub2>1< / sub2>, Vp<sub2>2< / sub2>, . . . Vp<sub2>n< / sub2>, and f(t−tp<sub2>1< / sub2>,t−tp<sub2>2< / sub2>, . . . t−tp<sub2>n< / sub2>) is a smooth shaping function. Intermodulation performance is then selectively improved in selected sub-bands by notch filtering prior to application to the non-linearity.

The invention discloses a TM-mode double-ended short circuit filter, which comprises a cavity, a cover plate, a tuning screw rod, a dielectric resonator, an elastic cushion and a metal layer. By utilizing flexible components of the elastic cushion and the like, the metal layer for playing a short circuit role can be fully and well laminated on the end surface of the dielectric resonator, the inner surface of the cover plate and the bottom surface of the cavity, so that the intermodulation performance is greatly improved and the loss is reduced. Meanwhile, the cover plate and the cavity are simple in structure and easy to process. The materials of rubber, plastic and the like can be utilized by the elastic cushion, so that the materials are easy to obtain, the cost is low and the structure is simple and convenient to process. Therefore, according to the TM-mode double-ended short circuit filter disclosed by the invention, processing and assembling processes are simple, the cost is low, and a short circuit is reliable and easy to implement.

When the coaxial connector in radio frequency is in connected state, gap of joint reference planes between male and female connectors is zero. At the same time, the coaxial connector can keep large axial directional contact pressure, and good axiality. There is annular bulge on surface of outer conductor of female connector. The annular bulge includes a bearing inclined plane. Dish shaped lock sheet with multiple teeth is setup inside male connector. When male connector and female connector are in connection state, the bearing inclined plane bears the lock sheet. Tangential force is generated between the lock sheet and the bearing inclined plane, and thrust is generated along normal direction at contact point of the bearing inclined plane. Thus, reference plane of female connector presses reference plane of male connector. Reducing volume and lightens weight, the coaxial connector is applicable to civil or industrial equipment, and areas of aviation and spaceflight.

The invention relates to a non-linear distortion compensation device of a power amplifier. The non-linear distortion compensation device of the power amplifier comprises a first analog-to-digital converter, a field programmable gate array (FPGA), a digital-to-analog converter, the power amplifier and a second analog-to-digital converter, wherein the first analog-to-digital converter, the FPGA, the digital-to-analog converter, the power amplifier and the second analog-to-digital converter are connected in sequence, and the second analog-to-digital converter is connected with the FPGA. The FPGA comprises a direct digital control (DDC)_digital up conversion (DUC) module, a cell failure ratio (CFR) peak clipping module, a digital pre-distortion (DPD) module, a self-adaption module and a memory, wherein an input end of the DDC_DUC module is connected with the first analog-to-digital converter, the DDC_DUC module, the CFR peak clipping module and the DPD module are connected in sequence, the DPD module is connected with the digital-to-analog converter and the self-adaption module, the self-adaption module is connected with the memory, and an output end of the second analog-to-digital converter is connected with the memory. Compared with the prior art, the non-linear distortion compensation device of the power amplifier has the advantages of saving cost of the FPGA, being high in stability, and the like.

The invention relates to a four-input and four-output electric bridge. The analysis and the distribution of the electric bridge on power signals are ensured through adopting novel coupling sheets and novel supporting structures (a long supporting medium and a short supporting medium), a space control medium is arranged between the two kinds of coupling sheets (upper and lower coupling sheets), the four coupling sheets (upper and lower coupling sheets) are tightly locked through plastic screws, the coupling sheets are placed in a cavity of the electric bridge through two kinds of support media (long and short support media), the coupling sheets are connected with a connector through silver plating screws, an inner cover plate and an outer cover plate are installed, and the electric indexes of the electric bridge can be realized. The four-input and four-output electric bridge has the advantages that the structure is simple, the electric indexes can be ensured only through installation, and the further debugging is not needed. Through the replacement via an N type connector, higher compatibility and reliability are realized.

The invention discloses a connector of an integral type adaptor cable. The connector comprises an inner conductor, insulating media and an outer conductor, wherein the inner conductor, the insulating media and the outer conductor are sequentially and coaxially distributed from the center; the tail of the inner conductor is coaxially provided with an inner core welding hole; the tail of the outer conductor is in a step shaft shape, the tail of the outer conductor is provided with a shielding layer welding pipe of a coaxial structure, and the inner diameter of the shielding layer welding pipe is matched with the outer diameter of a shielding layer of the cable. The connector is simple in structure, reliable in mechanical property, excellent in electrical performance, high in assembly efficiency, high in using rate of raw material, and high in one-time assembly percent of pass, has low intermodulation performance, and is suitable for mass production of cable assemblies.

The invention discloses a combining-dividing structure of a cavity radio frequency device. The combining-dividing structure comprises a first access and a second access, which are arranged in a cavity, wherein combining output of signals can be realized by the first access and the second access through a combining port, the combining port comprises a port joint, an inner conductor arranged in the port joint and a metal sleeve sleeved on the inner conductor, an insulation layer is arranged between the inner conductor and the metal sleeve, wherein the first access is realized by a medium filter and comprises at least one medium harmonic oscillator, and an arc-shaped lead is introduced from the inner conductor and is coupled with the medium harmonic oscillator which is adjacent to the combining port; the second access is realized by a metal coaxial filter and comprises at least one resonant column, and a lead is introduced from the metal sleeve and is electrically connected with the resonant column, which is adjacent to the combining port, in the metal coaxial filter. The invention further discloses the cavity radio frequency device adopting the combining-dividing structure. The cavity radio frequency device has the advantages of novel structural design, simple structure and good intermodulation, and is suitable for mass production.

The invention relates to the field of mobile communication base station antennas, and discloses a base station antenna broadband cavity phase shifter. The base station antenna broadband cavity phase shifter comprises a metal cavity, a pull rod, an end cover, a coaxial feeder, a PCB circuit board and upper and lower sliding medium plates; a first metallized through hole for electrically connectingTN junction transmission lines at the same positions on both sides of the PCB circuit dielectric board and a second metallized through hole for electrically isolating two adjacent TN junction transmission lines on the PCB circuit dielectric board are processed on the PCB circuit dielectric board, the TN junction transmission lines cover the first metallized through hole, and the second metallizedthrough hole is positioned between the two adjacent TN junction transmission lines. The phase shifter provided by the invention has the advantages of stable structure, good intermodulation performance, wide operation bandwidth, stable dynamic power in the phase shifting process, high linearity of phase shifting amount and the like.

A synthesizing method of hexadecanol / octodecanol-mixed polyoxyethylene ether belongs to the filed of synthesizing technology of organic compounds. Hexadecanol / octodecanol-mixed polyoxyethylene ether is produced through polymerization of raw materials including mixed hexadecanol / octodecanol and ethylene oxide under the existence of a catalyst. The weight proportion of the mixed hexadecanol / octodecanol and ethylene oxide is 1:0.145-18.6; the catalyst is one of or a mixture containing more than one of solid sodium methylate, methanol solution of sodium methylate, KOH, NaOH, etc, and the addition thereof is 0.05-0.2 weight percent of prepared hexadecanol / octodecanol-mixed polyoxyethylene ether. Through rational determination of technological parameters and conditions such as raw material proportion, catalyst amount, polymerization temperature and time, etc., the method of the invention can have the advantages of mild reaction condition, low equipment requirement and high product yield and, in addition, has no impurity or pollutant production. The product has light color, good appearance, wide adjustable molecular weight range and high mutual modulation effect when in mixed application with products having other properties.

The present invention discloses a radio frequency connector, including an anode connector and a cathode connector. The anode connector includes a pin, an anode outer conductor, a screw sleeve, a sealing ring, and an anode insulating medium. The cathode connector includes a jack, a cathode outer conductor, a cathode insulating medium, and an elastic outer conductor. In the present invention, an electrical contact surface is a circumferential surface, and stable and reliable electrical contact is formed, so that excellent intermodulation performance is ensured. Smooth and stable product insertion is ensured by using taper transition, and a coaxial cylindrical structure and a sealing groove structure are lengthened, so that stable and reliable alignment and coaxiality can be ensured to reducedamage during the insertion process of the product. At the same time, the product has greatly reduced its size, and a size of a mounting flange has also been reduced. A connection port is arranged ina limited space as much as possible, so that high density and miniaturization of the device are facilitated, and direct costs of the product are reduced.

Disclosed are a novel low-pass filtering path and a communication cavity device using the same. The novel low-pass filtering path comprises a metal cavity and a cover plate for covering the metal cavity. A plurality of sub-cavities which are sequentially communicated with one another is arranged inside the metal cavity. A connecting window is provided between every two adjacent sub-cavities. A conductor rod is provided in the metal cavity and sequentially penetrates the sub-cavities which are communicated with one another. Resonance rods are provided on the conductor rod corresponding to the connecting windows, wherein the resonance rods penetrate the conductor rod, and rod bodies of the resonance rods protrude towards the cover plate. Threaded holes corresponding to the resonance rods are provided on the cover plate. A group of tuning screw rods in which mounting holes are formed penetrate the threaded holes and extend into the cavity to be in capacitive coupling with the corresponding resonance rods. Medium sleeves are fitted in the mounting holes. The novel low-pass filtering path and the communication cavity device using the same provided by the present invention are advantageous in excellent electrical specifications, external tuning, and convenience in processing and batch production. By means of the communication cavity device using the path, strong inhibition can be produced in a wide out-of-band frequency band range, and the requirement for high isolation between communication systems can be satisfied.

The invention discloses a connector assembly, which comprises an adapter and a first socket. The adapter comprises an external conductor, a central conductor and insulators. The first socket comprisesa first external terminal, a first central terminal and a first insulation body. The outer wall of the first external terminal is provided with a first arc-shaped bulge at one end, the first arc-shaped bulge is electrically connected with the inner wall of the external conductor of the adapter, and the external conductor of the adapter and the first external terminal of the first socket are electrically contacted with each other only through the first arc-shaped bulge, so that the electrical contact area between the external conductor of the adapter and the external terminal of the socket isreduced, and the intermodulation performance of the connector assembly is improved.

The invention discloses a filter and a duplexer with the same. The filter includes a cavity, a cover plate with a close-over cavity, a metal resonator and a dielectric resonator. The metal resonator and the dielectric resonator are arranged in the cavity and parallel to the central axis. The filter further includes a first coupling rib and a second coupling rib which are arranged at the bottom of the cavity and connected with each other. The first coupling rib is connected with the metal resonator and is used for cutting the magnetic field of the metal resonator; the second coupling rib is used for cutting the magnetic field of the dielectric resonator so as to achieve coupling of magnetic fields between the metal resonator and the dielectric resonator. The filter is small in structural design difficulty, simple in the assembly process and good in reliability and inter-modulation performance.

The invention discloses a coupler. The coupler comprises a substrate, a microstrip line arranged on the substrate and a coaxial line fixed on the substrate, two ends of the coaxial line are respectively a signal input port and a signal output port; the microstrip line comprises two main coupling lines and an auxiliary coupling line, the auxiliary coupling line comprises a bent body and two connecting lines connected to the two ends of the body, the two main coupling lines are connected to the two connecting lines respectively, the free ends of the two main coupling lines are a coupling port and an isolation port respectively, and the main coupling line is of a bent structure. Through coupling of the coaxial line and the microstrip line, the signal loss is reduced, and the intermodulation performance is excellent; and moreover, the microstrip line comprises the two main coupling lines and the auxiliary coupling line, and the two main coupling lines and the auxiliary coupling line are bent, so that the wiring space required by the microstrip line is saved, the miniaturization design is realized, and the bandwidth of the coupler is increased.

The invention provides a radio frequency modulation output circuit, comprising: a first frequency mixer, a first amplifying circuit, a second frequency mixer, a second amplifying circuit and an output circuit, wherein the first frequency mixer is used for receiving a first input signal and a first carrier signal, and generating a first radio frequency modulation signal after frequency mixing of the signals; the first amplifying circuit is connected with the first frequency mixer, and is used for generating a first amplifying signal after amplifying the first radio frequency modulation signal; the second frequency mixer is used for receiving a second input signal and a second carrier signal, and generating a second radio frequency modulation signal after frequency mixing of the signals; the second amplifying circuit is connected with the second frequency mixer, and is used for generating a second amplifying signal after amplifying the second radio frequency modulation signal; and the output circuit is connected with the first amplifying circuit and the second amplifying circuit, and is used for adding the first amplifying signal and the second amplifying signal together and outputting the signal after addition. By using the radio frequency modulation output circuit provided by the invention, the isolation and linearity of the circuit can be improved, thereby stable gain within the whole wide band range can be ensured.

The invention provides a resonator, a filter, a duplexer, a multiplexer and communication equipment. The resonator comprises a resonant cavity body; the resonant cavity body is provided with a resonant cavity and an opening end; the resonator also comprises a deformation cover plate covering the opening end and connected with the resonant cavity body, a resonant tube located in the resonant cavity, an adjusting mechanism arranged on the deformation cover plate; a groove is formed in the side, back on to the resonant cavity, of the deformation cover plate; the adjusting mechanism is arranged in the groove and used for providing acting force in the axial direction of the resonant tube, so that the bottom of the groove is continuously deformed, and the distance between the deformation cover plate and the resonant tube can be adjusted. According to the resonator, filter, duplexer, multiplexer and communication equipment of the invention, the intermodulation performance and the high-power performance of a product can be improved, the production passing rate of the product can be improved, the rejection rate and the maintenance cost of the product are reduced, and the market competitiveness of the product is improved.

The invention discloses a connector assembly, which comprises an adapter and a first socket, wherein the first socket is suitable for being assembled and locked to one end of the adapter. The adaptercomprises a cylindrical external conductor, a columnar central conductor and insulators, wherein the columnar central conductor is arranged in the external conductor; and the insulators are arranged between the external conductor and the central conductor so as to isolate the external conductor and the central conductor. The first socket comprises a first insulation body, a cylindrical first external terminal and a columnar first central terminal, wherein the first insulation body is suitable for being inserted into one end of the cylindrical external conductor; the cylindrical first externalterminal is maintained on the first insulation body and suitable for being electrically contacted with one end of the external conductor; and the columnar first central terminal is maintained on the first insulation body and suitable for being electrically contacted with one end of the central conductor. The central conductor and the first insulation body are provided with a locking structure which is suitable for locking the central conductor and the first insulation body together. In the invention, the insulation body of the first socket and the central conductor of the adapter are locked together, so that the adapter can be reliably locked to the first socket.

The invention relates to a miniaturized N-type broadband cavity power divider. The power divider comprises a joint, a cavity, a coaxial rod, a contact pin and an insulator, the coaxial rod is placed in the cavity, the port of the coaxial rod is connected with the contact pin of an N-type joint, and the contact pin of the N-type joint is used as a jack of the N-type broadband cavity power divider;the N-type joint is provided with a boss and a sealing ring, and is in threaded connection with the cavity through the insulator; and the outer diameter of the cavity is 14 mm, the inner diameter of the cavity is 10 mm, and M13 * 1 threads are adopted in the N-type connector. The power divider has the characteristics of low cost, excellent performance, good third-order intermodulation, stable intermodulation, small structural size, simple assembly and the like.

The invention discloses a filter and a communication device. The filter comprises: a shell having a first direction and a second direction perpendicular to each other; a first filtering branch arranged on the shell and composed of eight first filtering cavities which are coupled in sequence, wherein the eight first filtering cavities further form four first cross coupling zero points; and a second filtering branch circuit is arranged on the shell, the second filtering branch circuit is adjacent to the first filtering branch circuit in the first direction, the second filtering branch circuit is composed of eight second filtering cavities which are sequentially coupled, and the eight second filtering cavities further form four second cross coupling zero points; The structure of the first filtering branch is the same as that of the second filtering branch. In this way, the cost can be reduced, the consistency can be improved, and the size can be reduced.

The invention discloses a phase position adjusting device of a base station antenna, and the antenna. The phase position adjusting device comprises a fixed circuit board and a movable circuit board; the fixed circuit board is fixed to a base, and the movable circuit board and the fixed circuit board are connected through a rotary shaft; the physical path length of a microwave passage formed by thetwo boards is changed by rotating the movable circuit board, and thus phase positions of corresponding channels are changed; four or more pairs of discontinuous arcs which are distributed in the radial direction are arranged on the fixed circuit board, circuits where the two pairs of arcs close to the rotary shaft are located constitute the first-stage arc channel, and circuits where the other two pairs of arcs are located constitute the second-stage arc channel; and the outer sides of the two pairs of adjacent discontinuous arcs of the first-stage arc channel and the second-stage arc channelare connected to form a cascade circuit form. Cascade and multi-stage arc circuits are used simultaneously, under the situation that demands are met, a product is smaller, and the cost is lowered; and compared with a common product, in order to reach the same phase position change amount, the rotating angle required by the phase position adjusting device is smaller, and more flexibility is achieved.

The invention discloses a novel low-pass filter path and a communication cavity device using the same. The novel low-pass filter path includes a metal cavity and a cover plate covering the metal cavity. There are connected sub-cavities, and connection windows are provided between two adjacent sub-cavities. A conductor rod is arranged in the metal cavity to pass through the connected sub-cavities in sequence. On the conductor rod corresponding to each connection window, there is a The cover plate exposes the resonant rod of the rod body. There are threaded holes corresponding to the above resonant rods on the cover plate. A group of tuning screws with mounting holes inside pass through the threaded holes and go deep into the cavity to capacitively couple with the corresponding resonant rod. The hole is covered with a medium sleeve. The novel low-pass filter channel and the communication cavity device using it in the present invention have excellent electrical indicators, can be tuned externally and are convenient for processing and mass production, and the communication cavity device using the channel can generate Strong suppression to meet the high isolation requirements between communication systems.

The invention discloses a 1 / 2 screwed pipe cable welded type connector and a welding method thereof. The 1 / 2 screwed pipe cable welded type connector is characterized by comprising a screwed pipe connector body (1), a screwed pipe connector welding shell (2), a screwed pipe cable (3), a screwed pipe connector inner wall thread (4) and a screwed pipe cable outer wall thread (5), wherein a screwed pipe connector outer wall hole (6) is formed in the screwed pipe connector welding shell (2) and communicates with the screwed pipe connector inner wall thread (4). During welding, soldering tin after being molten is completely fitted in the threads, the welding reliability is greatly improved, and the intermodulation performance is substantially improved.

The invention provides a radio frequency modulation output circuit, comprising: a first frequency mixer, a first amplifying circuit, a second frequency mixer, a second amplifying circuit and an output circuit, wherein the first frequency mixer is used for receiving a first input signal and a first carrier signal, and generating a first radio frequency modulation signal after frequency mixing of the signals; the first amplifying circuit is connected with the first frequency mixer, and is used for generating a first amplifying signal after amplifying the first radio frequency modulation signal; the second frequency mixer is used for receiving a second input signal and a second carrier signal, and generating a second radio frequency modulation signal after frequency mixing of the signals; the second amplifying circuit is connected with the second frequency mixer, and is used for generating a second amplifying signal after amplifying the second radio frequency modulation signal; and the output circuit is connected with the first amplifying circuit and the second amplifying circuit, and is used for adding the first amplifying signal and the second amplifying signal together and outputting the signal after addition. By using the radio frequency modulation output circuit provided by the invention, the isolation and linearity of the circuit can be improved, thereby stable gain within the whole wide band range can be ensured.