90 results about "SMA connector" patented technology

The invention discloses an ultra-wideband balancer applied to high-power microwave measurement and a manufacturing method and device. The ultra-wideband balancer comprises a thick slot line layer, a microstrip line dielectric plate and a microstrip line layer, wherein the microstrip line dielectric plate and the microstrip line layer are stacked on one side of the thick slot line layer in the second direction, and the microstrip line layer is provided with an output port; the first input port and the second input port are respectively connected with an SMA connector, the phase difference of input signals of the two SMA connectors is 180 degrees, and the output port is connected with an SMA connector; a resonant cavity and a thick slot line resonator are formed between the first thick slot line structure and the second thick slot line structure, and the thick slot line resonator and the microstrip line layer form electromagnetic coupling, so that an input signal which is input by the first input port and the second input port and has a phase difference of 180 degrees is output from the output interface as an anti-phase microwave synthesis signal; the ultra-wideband balancer has larger power capacity, the problem that the power capacity is limited due to the fact that the slot line is too thin is solved, and the ultra-wideband balancer applied to high-power microwave measurement has larger power capacity.

The invention discloses an anti-interference array antenna of a satellite navigation receiver, which relates to the technical field of satellite navigation and comprises a radiation element, a ceramic substrate, an array element base and a metal bottom plate, a threaded hole is formed in the upper portion of the array element base, and a first slotted pan head screw is arranged in the threaded hole. The array element base is provided with a ceramic substrate and a radiation element through a slotted pan head screw I; the radiation element is positioned above the ceramic substrate; a central antenna array element is mounted at the central position of the top of the metal bottom plate, and a choke ring is arranged on the outer side of the central antenna array element; and an SMA connector is mounted below the slotted pan head screw I. Hardware-level mutual coupling suppression is realized by combining the multilayer microstrip antenna with the EBG choke ring and optimizing the arrangement of the antenna array elements, and by optimizing the hardware structure, the mutual coupling interference between the array elements is reduced from the source, the performance of the antenna is improved, and the interference positioning problem in an unknown mutual coupling environment is solved. Interference can be accurately and quickly positioned and suppressed, and the anti-interference capability of the antenna is improved.

The invention discloses a low-profile broadband circularly polarized antenna for an ultra-wideband positioning system. The low-profile broadband circularly polarized antenna comprises a first dielectric substrate, a grounding plate and a second dielectric substrate, the first dielectric substrate, the grounding plate and the second dielectric substrate are sequentially attached from top to bottom; a plurality of circular metal patches are arranged on the upper surface of the first dielectric substrate to form a metasurface structure; a Z-shaped gap is etched in the grounding plate; the lower surface of the second dielectric substrate is provided with a microstrip feed structure, and the microstrip feed structure comprises a microstrip line, a feed branch with a gradual change structure, and an SMA connector. One end of the microstrip line is connected with the feed branch with the gradual change structure, and the other end is connected with the SMA connector. The circular metal patch is adopted to form the metasurface structure, the rectangular gaps of different sizes are etched in the center of the circular metal patch, the feed branch knot with the gradual change structure is coupled with the Z-shaped gap to excite the metasurface structure to generate circular polarization radiation, and large circular polarization bandwidth and impedance bandwidth are achieved.

The invention discloses a broadband circularly polarized radiator antenna based on slot gap waveguide, and relates to the technical field of waveguide slot antennae, the broadband circularly polarized radiator antenna based on slot gap waveguide is provided with a circularly polarized radiation slot structure, a slot gap waveguide transmission structure and a microstrip feed structure from top to bottom in sequence; the microstrip feed structure comprises a dielectric substrate and a radio frequency SMA connector, wherein the back surface of the dielectric substrate is coated with copper, and the front surface of the dielectric substrate is etched with a microstrip patch. The slot gap waveguide transmission structure adopts an all-metal slot gap waveguide structure, comprises periodically arranged metal pins and stepped metal ridges, and is used for transmitting electromagnetic waves; the circularly polarized radiation slot structure comprises dumbbell-shaped slots, orthogonal radiation slots and metal fins, and is used for realizing broadband circularly polarized wave radiation. The microstrip patch excitation is adopted to facilitate active high integration, and the broadband circular polarization performance, the out-of-band filtering characteristic and the good heat dissipation characteristic are achieved through the slot gap waveguide transmission structure design and the orthogonal radiation slot design.

The utility model relates to the technical field of filter devices, in particular to a direct-current power grid conducted emission measuring device which comprises a shell, an input interface is arranged at one end of the shell, an output interface is arranged at the other end of the shell, and four cavities are arranged in the shell. The device sequentially comprises an input end wiring area, a power grid conduction measurement function area, a direct current power grid filtering function area and an output end wiring area from left to right, and is characterized in that the power grid conduction measurement function area comprises a current probe and an SMA connector, and the current probe is connected with the SMA connector through a radio frequency coaxial cable; the direct current power grid filtering function area comprises a first capacitor, a second capacitor and a bleeder resistor, the first capacitor and the second capacitor are connected in series, and the bleeder resistor is connected with the first capacitor and the second capacitor in parallel. The device is a multifunctional integrated direct-current power grid conduction emission measuring device.

The utility model discloses an independent stick-shaped antenna, which comprises an upper cover and a bottom shell which are connected through an ultrasonic welding line structure to form an antenna housing main body, the lower connecting seat is connected with the bottom shell through a pin and is used for supporting and fixing the antenna housing main body; the RP-SMA connector is assembled and connected with the lower connecting base, and an internal cable of the RP-SMA connector penetrates through holes reserved in the bottom of the bottom shell and the bottom of the lower connecting base so as to reach the interior of the antenna housing body; wherein the interior of the radome main body is used for placing a PCB (Printed Circuit Board), and the internal cable is used for being welded on the PCB, so that the PCB carries out antenna signal processing; it can be understood that according to the embodiment of the invention, the antenna housing is designed to be provided with the upper cover and the bottom shell which are detachable, and the upper cover and the bottom shell are connected through the ultrasonic welding technology, so that the installation difficulty of the PCB can be effectively reduced, and the antenna is more convenient and faster to produce, test and maintain.

The invention provides an S-band radio frequency signal transmitting port and a design and assembly method thereof, relates to the technical field of special equipment for radio frequency communication, and solves the problem of insufficient harmonic suppression caused by an infeasible shielding structure or a defect of a connection interface in the existing scheme. The transmitting port comprises a structural cavity, a printed circuit board and a plurality of SMA connectors, the printed circuit board is accommodated in the structural cavity, a transmitting circuit is arranged on the printed circuit board, and the structural cavity is used for providing radio frequency shielding for the printed circuit board; the SMA connectors are assembled on the outer surface of the structural cavity, and pins of the SMA connectors penetrate through the structural cavity and then are connected with the printed circuit board. The peripheral edge of the printed circuit board is provided with a non-solder-resist area with a preset width, and when the printed circuit board is accommodated in the structural cavity, the non-solder-resist area of the printed circuit board is in tight fit connection with the inner surface of the structural cavity. According to the invention, a closed shielding frame body is formed, so that higher harmonic radiation leakage is prevented.

This invention discloses a detachable electric field probe and calibration method for measuring the specific absorptivity of a vehicle-mounted human body model. The probe includes a metal dipole, a polytetrafluoroethylene (PTFE) ring, a waterproof metal casing, a ferrite magnetic ring, an SMA connector, and a detachable rubber sleeve. To prevent tissue fluid leakage, all components except the radiating element of the metal dipole are housed within the waterproof metal casing. The inner and outer conductors of the SMA connector connect to the upper and lower metal radiating elements, respectively. The ferrite magnetic ring is fitted onto the SMA connector, significantly improving the radiation pattern distortion problem of the electric field probe at low frequencies. The SMA connector connects to an RF receiver and a spectrum analyzer to acquire spectral information and the received power of the electric field probe, which, after calibration, reflects the magnitude of the field strength. This invention enables specific absorptivity measurement over a wide frequency range, featuring small size, low cost, and ease of use. It is suitable for specific absorptivity measurement in vehicle-mounted electromagnetic compatibility testing, medical device evaluation, and related scientific research fields.

The upper die casting structure of the SMA connector comprises an upper die casting, the upper die casting is connected with a lower die casting in a riveting mode, a plurality of vertical line protrusions are arranged on the outer wall face of the lower portion of the upper die casting in an annular array mode, and notches are formed in the middles of the vertical line protrusions. According to the upper die casting structure of the SMA connector, the plurality of vertical stripe protrusions are arranged on the upper die casting, and the corresponding notches are formed in the middles of the vertical stripe protrusions, so that vertical stripe interference points are only concentrated on the upper face and the lower face of the lower portion of the upper die casting, middle vertical stripes are omitted, the vertical stripe proportion of the upper die casting is reduced, it is guaranteed that the riveting force of the upper die casting and the lower die casting is stable, and the yield of the upper die casting is improved. And meanwhile, no cracking is ensured.

The invention relates to an antenna structure and a preparation method thereof. The antenna structure comprises a flexible radiation layer; the flexible grounding layer is arranged opposite to the flexible radiation layer; the compressible dielectric layer is located between the flexible radiation layer and the flexible grounding layer, the conductive side of the flexible radiation layer is far away from the compressible dielectric layer, and the conductive side of the flexible grounding layer is far away from the compressible dielectric layer; the SMA connector comprises a base and a first connecting part which are connected with each other, the base is located on the side, away from the compressible dielectric layer, of the flexible grounding layer, and the first connecting part is electrically connected with the flexible radiation layer and the flexible grounding layer. The antenna structure composed of the flexible radiation layer, the grounding layer and the compressible dielectric layer can be freely bent and compressed to deform.

The utility model discloses a kind of SMA connector including first body, second body and third body, wherein, third body 45 ° is bent to form first part and second part, first body is screw-connected in the first part of third body, second body is screw-connected in the second part of third body, the inside after first body, second body and third body are connected to form medium passage;Medium passage is equipped with center conductor, the first end of center conductor is installed at first body close by through first insulating medium, the second end of center conductor is installed at second body close by through second insulating medium;The utility model can solve the problem that the angle of traditional SMA radio frequency connector joint is fixed, difficult to adjust direction, so it is often connected with half rigid wire in the mode of throwing wire, and half rigid wire is bent, but, manual bending can lead to angle inaccuracy or bending shape irregular, affect signal transmission performance.

The utility model relates to the technical field of connectors, and particularly discloses an SMA connector suitable for a 0-6GHZ frequency band, the SMA connector comprises an outer conductor, a first insulator, a second insulator, an inner conductor and a pin, the outer conductor is internally provided with a first jack and a second jack which are vertically communicated, the first insulator is cooperatively inserted in the first jack, and the second insulator is cooperatively inserted in the second jack. The second insulator is cooperatively inserted into the second jack, and the first insulator abuts against the second insulator; inner hole channels are formed in the first insulator and the second insulator respectively, and the inner conductor is arranged in the inner hole channels of the first insulator and the second insulator in a penetrating mode at the same time; the peripheral wall of one end of the outer conductor is provided with an external thread coaxial with the first jack, the pin is fixedly connected to the other end of the outer conductor, and the pin is parallel to the axis of the second jack. The radio frequency connector has the effect of solving the problem that a radio frequency connector is difficult to meet the transmission requirements of a 5G network at the frequency bands of 3.5 GHZ and 4.9 GHZ.

The application discloses a high-speed flexible board connecting assembly, which comprises a flexible printed board, a standard SMA connector arranged at one end of the flexible printed board and used for connecting a vector network analyzer, and a gold finger structure arranged at the other end of the flexible printed board and used for being plugged into a standard VPX socket; the gold finger structure comprises a plurality of gold fingers, and the gold fingers are connected with the corresponding standard SMA connectors through the flexible printed board. Compared with the prior art, the high-speed flexible connecting assembly has the advantages of high speed (20 Gbps), low loss, low cost and good quality consistency, and can be flexibly used for building a VPX architecture test link.

The invention provides an ultra-low field magnetic resonance imaging integrated circular polarization radio frequency transmit-receive coil, and relates to the ultra-low field magnetic resonance imaging technology, the ultra-low field magnetic resonance imaging integrated circular polarization radio frequency transmit-receive coil comprises a medium substrate, split copper sheet ring structures and split straight copper sheet structures, the medium substrate is a cylindrical structure, the medium substrate is uniformly provided with multiple groups of split copper sheet ring structures, and the split straight copper sheet structures are arranged on the medium substrate. The split straight copper sheet structures are vertically and uniformly arranged on the split copper sheet ring structures, and feed ports are formed in the split copper sheet ring structures and connected with coaxial cables through SMA connectors. According to the invention, the transmitting and receiving of the circularly polarized magnetic field are realized through orthogonal feed and the adjustable element, the circularly polarized magnetic field can obviously improve the received signal strength and realize the effective improvement of the signal-to-noise ratio, the parameterized design is adopted, the flexible adaptation of multiple scenes is supported, and the antenna can be applied to different field strengths by adjusting the parameters of the adjustable capacitor, the adjustable resistor and the like. And the application scene is widened.

This invention relates to the field of flight technology, specifically to a flexible SMA (Surface Mount Microwave) non-destructive interconnection high-frequency small module test fixture and its usage method. The flexible SMA non-destructive interconnection high-frequency small module test fixture includes a base module, a power-on module, a slide module, and a push rod module. The usage method involves placing the device under test (DUT) in the test area, pushing the two slide modules to align the SMA connector with the signal pins at both ends of the DUT, continuously pushing the slide modules into place to complete the connection between the SMA connector and the signal pins at both ends of the DUT, and then applying a stop lever to the push rod module to apply a constraint force to the DUT against the base module and connect the power-on port of the DUT. Compared to existing designs, this invention employs a floating flexible docking scheme to achieve non-destructive interconnection between the SMA microwave RF connector and the signal pins of the DUT, simulating and replacing the rigid interconnection of the traditional mode. It uses elastic elements to flexibly constrain the DUT to the fixture, and a cam mechanism to achieve flexible constraint of the DUT while simultaneously completing the power-on connection.

The application discloses an SMA structure with a jumper frame and particularly relates to the technical field of SMA connectors, which comprises a frame body, the top end of the front face of the frame body is fixedly connected with a welding sheet, the top of the welding sheet is provided with a pin, the outside of the pin is provided with a fixing mechanism, the fixing mechanism comprises a bottom clamping block, the top end of the bottom clamping block is in contact with the bottom end of the back face of the pin, the top end of the back face of the pin is movably connected with a top clamping plate, the bottom end of one side of the top clamping plate is hingedly connected with an expansion sleeve, one side of the bottom of the expansion sleeve is fixedly connected with a clamping seat connecting plate, one end of the top clamping plate is fixedly connected with an angle plate, the inside of the angle plate is movably connected with a connecting bolt, the top of the connecting bolt movably sleeved with a compression spring, the pin and the frame body are fixed by the fixing mechanism, the dismounting work of the pin is facilitated, and in addition, the two sides of the pin can be uniformly stressed by the bottom clamping block, the top clamping plate and the L-shaped clamping plate, so that the stable signal transmission is ensured.

The invention discloses a low-profile high-gain filtering antenna based on a centrosymmetric parasitic patch structure, which belongs to the technical field of antennas for wireless communication and comprises a radiation network, an F4B dielectric plate and a metal floor which are sequentially arranged from top to bottom, the radiation network is located on the upper surface of the dielectric plate and is composed of a driving patch, two symbiotic patches connected with the driving patch and four parasitic patches which are distributed around the driving patch in a central symmetry mode. Two metal grounding poles are embedded in the dielectric plate, and two ends of the metal grounding poles are respectively connected with the radiation network and the metal floor; an inner conductor of the coaxial feed SMA connector penetrates through the metal floor and the dielectric plate and then is connected with the center diamond-shaped driving patch, and an outer conductor is connected with the metal floor. The filter is of a single-layer low-profile structure, does not need an additional filter circuit, and has the advantages of being simple in structure and easy to process and test.

The utility model provides an anti-loosening structure of an SMA connector. The anti-loosening structure comprises an SMA connector assembly, an anti-loosening piece and an anti-loosening piece, a cable assembly; the rotating mechanism is mounted on the surface of the SMA connector assembly; the elastic pressing assembly is installed on the surface of the SMA connector assembly, the locking assembly is installed on the top side of the elastic pressing assembly, and the locking assembly is installed on the surface of the elastic pressing assembly; and the locking plate is fixedly connected to the inner wall of the locking assembly. Under the action of the elastic pressing assembly, the anti-falling fixing effect of the limiting plate on the fixing cylinder is improved, the connection stability of the cable and the SMA connector is enhanced, stable signal transmission is guaranteed, and the connection of the cable and the SMA connector by external force is reduced.

The invention relates to the field of metamaterial antennas, and provides a directional radiation antenna structure with adjustable power, which aims at solving the problem that the existing beam control or directional diagram reconstruction method generally depends on a mechanical system, a phased array or a reconfigurable metasurface and lacks the capability of dynamically and continuously adjusting the radiation power of a directional antenna on the premise of not changing the beam shape. One end of the metal waveguide A fixes the SMA connector, and the other end is connected with the metal waveguide B; the metal waveguide B is of a cavity structure, an electric regulation and control structure is arranged in an inner cavity of the metal waveguide B. A plurality of openings distributed at equal intervals are formed in the outer side of the emergent face of the metal waveguide C. The resonance characteristic of the electric opening resonance ring is changed by changing capacitance of the variable capacitance diode. The metamaterial antenna with the near-zero dielectric constant can keep high directionality and a stable radiation pattern, and the radiation power of the metamaterial antenna with the near-zero dielectric constant can be remarkably enhanced.

The utility model relates to the technical field of coaxial connecting lines, and particularly discloses an IPEX-to-SMA radio frequency coaxial connecting line suitable for a 0-6GHZ frequency band, the IPEX-to-SMA radio frequency coaxial connecting line comprises a coaxial cable, an SMA joint and an IPEX joint, and the coaxial cable comprises a sheath, a conductive layer, an insulating layer and a first inner conductor which are sequentially arranged from outside to inside; the SMA connector comprises an outer conductor, an insulating medium, a second inner conductor and a pressing tail, a first jack is formed in the outer conductor, the insulating medium is inserted into the first jack in a matched mode, and the second inner conductor coaxially penetrates through the insulating medium; the pressing tail is provided with a second jack, one end of the coaxial cable is cooperatively inserted in the second jack, the conductive layer is connected with the pressing tail, the pressing tail is cooperatively inserted in the first jack, and the first inner conductor is connected with the second inner conductor; and the other end of the coaxial cable is connected with the IPEX connector. The IPEX-to-SMA radio frequency coaxial connecting line has the effect of solving the problem that the IPEX-to-SMA radio frequency coaxial connecting line which is used for the 0-6GHZ frequency band and has excellent performance is needed.

The application discloses a kind of surface-mounted radio frequency relay test tool and its design method, including base, the surface of the base is equipped with installation area and joint installation site, printed board assembly, the printed board assembly is installed in the installation area on base, radio frequency joint, radio frequency joint is set on the joint installation site of base, SMA connector assembly, the SMA connector assembly is inserted in radio frequency joint, for being connected with external test instrument.This application, by the design method of optimization printed board, realize the integration of surface-mounted relay product radio frequency signal output and control signal input, and through the conversion of output interface, without welding can complete surface-mounted radio frequency relay and the connection of test system, completely avoid the damage caused to product in welding and disassembly process, to reduce product scrap rate, simultaneously without welding, also can greatly reduce single test time, improve test efficiency, to meet the full inspection demand of mass production.

The utility model discloses a high-frequency vertical PCB welding type SMA connector, and particularly relates to the technical field of electronic equipment, the high-frequency vertical PCB welding type SMA connector comprises a PCB and an SMA connection main body, the top of the PCB is fixedly provided with the SMA connection main body, and the SMA connection main body comprises a wiring abdicating groove, a connection enhancing pin and a PCB matching ring. The four edges of the bottom of the wiring abdicating groove are provided with connection enhancing pins, and the centers of the four groups of connection enhancing pins are fixedly provided with PCB matching rings. The wiring abdicating groove 1 can be used for surface PCB wiring short circuit, meanwhile, continuous impedance change is prevented from being as small as possible, the pins of the MSA connecting main body are inserted into corresponding welding holes of the PCB to be welded, the adhesive force and the anti-torque performance of the MSA connector are enhanced, the risk that the PCB of the surface mounting connector is peeled off on the same layer is avoided, and the service life of the surface mounting connector is prolonged. The PCB matching ring 3 and the optimized PCB are provided with the welding holes, and the impedance of the welding point of the center pin is adjusted, so that the purposes of matching the impedance and optimizing the high-frequency index are achieved. Through the method, the SMA vertical welding connector can reach 26.5 GHz.

The utility model relates to an integrated circuit strip testing device in the technical field of integrated circuit testing, which comprises a manual testing cover, a PCB (printed circuit board), a socket, a strip and a metal backing plate, the metal backing plate is provided with a first positioning column, the first positioning column is used for fixing the strip with a positioning hole, and the first positioning column is used for fixing the strip with the positioning hole. The socket is provided with 15 fine spring probes used for contacting with 15 pads on a to-be-tested strip, an RF signal line of the PCB leads a signal to the SMA joint from the socket, the SMA joint can be connected with a cable of a network analyzer to carry out an RF test, and the hand test cover can press down the probes through rotation to enable the probes to contact with the strip so as to carry out the test. The integrated circuit strip test device provided by the utility model is suitable for a small-batch manual spot test scene, the cost generated by purchasing and maintaining automatic test equipment can be obviously reduced, and the integrated circuit strip test device is compact in structure, easy to carry, simple and convenient to operate, and very suitable for factory operators to quickly master and use.

The utility model discloses a miniature high-gain PCB multi-oscillator rubber rod antenna, which comprises a device body, the device body comprises an SMA joint, an antenna shell and a rubber rod sleeve, the SMA joint is installed at the rear end of the antenna shell through a rotating shaft, and the rubber rod sleeve is sleeved at the front end of the antenna shell; the antenna shell is of a conical structure, a PCB and a coaxial line are arranged in the antenna shell, a first oscillator, a second oscillator and a third oscillator are installed on the surface of the PCB, the first oscillator is located at the rear end of the second oscillator, the third oscillator is located at the rear end of the second oscillator, the first oscillator and the second oscillator are connected through the coaxial line, and the coaxial line is arranged between the first oscillator and the second oscillator. The second oscillator and the third oscillator are connected through a copper foil. According to the device, the antenna is designed by adopting a common PCB (Printed Circuit Board), the process is mature, the cost is low, the production is convenient, the performance is stable, and meanwhile, the device can be used for external rod sleeves with different shapes.

A biconical antenna includes a dielectric corset having a first conical chamber defined therein and a second conical chamber defined therein opposite the first conical chamber. The dielectric corset further defines a passage from the second conical chamber to the first conical chamber. A first conical radiating structure is bonded within the first conical chamber of the dielectric corset. A second conical radiating structure is bonded within the second conical chamber of the dielectric corset. An SMA connector is connected to the second conical radiating structure and has a metal pin extending through the passage to electrically contact the first conical radiating structure and provide RF signals thereto.

The utility model belongs to the technical field of partial discharge insulation detection, and particularly discloses a novel anti-interference ultrahigh frequency partial discharge detection circuit, which comprises an antenna, a balun circuit and a band elimination filter, the antenna is used for receiving ultrahigh-frequency electromagnetic wave signals generated by partial discharge, the output end of the antenna is connected with the balun circuit, the output end of the balun circuit is connected with the band elimination filter, and the output end of the band elimination filter is integrated with an SMA connector and used for outputting the ultrahigh-frequency electromagnetic wave signals. According to the utility model, the Balun, the band elimination filter and the antenna are placed together, so that partial discharge signals can be effectively received and processed, external interference signals are suppressed, and accurate detection of partial discharge of electrical equipment is realized.

The utility model discloses a probe card structure used for filter chip testing, and specifically relates to the probe card manufacturing technology field, the probe card structure comprises a shielding needle body and a PCB board, the shielding needle body is installed on the PCB board, the shielding needle body comprises a tungsten steel needle, an insulating layer is arranged outside the tungsten steel needle, a metal outer layer is arranged outside the insulating layer, and the metal outer layer is arranged outside the shielding needle body. One end of the tungsten steel needle is connected with an SMA connector. According to the utility model, the inner conductor of the pin card is replaced by the tungsten steel pin, and the metal sheet is additionally arranged on the epoxy surface, so that the performance of the pin card is greatly improved, the strict requirement of a filter product on high test frequency is effectively met, the anti-interference capability is enhanced, and the accuracy and stability of test data are ensured; all parts and machining modes can be autonomously mastered, dependence on imported products can be avoided, and industrial safety and autonomy are greatly improved.

The utility model discloses a resistance-capacitance-inductance SMD device multi-station compatible test tool, which comprises a base, a test platform arranged on the base, a coaxial probe arranged at the center of the platform, four elastic sheet modules uniformly distributed around the periphery of the coaxial probe, and bent and raised golden finger elastic sheets arranged at the front ends of the elastic sheet modules. The golden finger elastic sheet is used for being connected with a pin of an SMD device, the coaxial probe is connected with an SMA connector arranged below the test platform, an SMD device frame plate is fixedly arranged on the test platform, an SMD device limiting frame is arranged on the frame plate, a strip-shaped hole is formed in the elastic sheet module, and the strip-shaped hole is connected with the coaxial probe. The SMD device frame plate is provided with a plurality of strip-shaped holes, the strip-shaped holes are used for adjusting positioning of different positions of the four elastic sheet modules according to SMD devices of different sizes to form four-station testing, the SMD device frame plate is fixed on the testing platform in a replaceable mode through pins, the SMD device frame plate is provided with adjusting long holes, and the adjusting long holes correspond to the strip-shaped holes in the elastic sheet modules.

The utility model discloses a cantilever type RF (Radio Frequency) needle card, which comprises a PCB (Printed Circuit Board) and a plurality of RF needles, the RF needles are obliquely fixed on the PCB, and the PCB is grounded; the RF needle comprises a needle head part, a needle body part and a needle tail part, the needle head part comprises a needle tip and a connecting part, and the needle tip and the connecting part are bent; the outer side of the needle body part is sleeved with a protective sleeve, and the protective sleeve comprises an insulating layer, a shielding layer and an outer skin layer from inside to outside; and the needle tail part is connected with the SMA connector. According to the utility model, the effect of a radio frequency card is realized in the form of a cantilever needle card, and the final product can reach about 10GHz which cannot be achieved by a common cantilever needle card; the protective sleeve is sleeved on the outer side of the RF needle, the insulating layer and the shielding layer are utilized to ensure that the whole needle can reach impedance matching of 50 ohms, and a radio frequency SMA connector is connected to the tail of the needle subsequently, so that the needle can be conveniently connected with a test end of a client for accurate test.

The invention discloses a broadband circularly polarized wearable antenna based on a mirror image structure. The broadband circularly polarized wearable antenna comprises a top cross dipole, a bottom cross dipole, a feed network, a transparent silica gel medium and an SMA connector. The back radiation of the antenna is effectively reduced by using the crossed dipole structures which are in mirror images of each other; the asymmetric crab claw radiation patch structure is introduced, so that the impedance bandwidth and 3-+ dB axial ratio bandwidth of the antenna are widened; the flexible material is used as the radiation part, and the transparent silica gel is used as the medium, so that the antenna has flexibility and bendability, and is convenient to wear. As the antenna has the broadband circularly polarized radiation characteristic and has the characteristics of small back radiation, compact structure and easy bending, the antenna is applicable to a broadband wearable system.