60 results about "Coaxial probe" patented technology

The invention relates to the technical field of wafer testing, and discloses a probe card and a testing system. The probe card comprises a plurality of unit groups which are periodically arranged; the unit group comprises at least two coaxial probes; wherein at least one coaxial probe is used for abutting against the input end of a to-be-tested device, and at least one coaxial probe is used for abutting against the output end of the to-be-tested device. According to the invention, through the plurality of unit groups arranged in the periodic array, a plurality of devices can be tested at a time when wafer testing is carried out, so that the wafer testing speed is improved, the wafer testing time is shortened, and the problems of low testing speed and long testing time existing in wafer testing in the prior art are solved.

The embodiment of the invention provides a stable-connection coaxial probe, and relates to the technical field of semiconductor testing, the stable-connection coaxial probe comprises a coaxial spring probe, an upper needle sleeve, a lower needle sleeve, an upper shaft block, a middle shaft block and a lower shaft block, the coaxial spring probe comprises a needle tube, a lower needle head, an upper needle head and an adjusting spring located between the upper needle head and the lower needle head, the coaxial spring probe is arranged in a sleeve assembly composed of an upper needle sleeve and a lower needle sleeve, the upper and lower needle heads of the coaxial spring probe extend out of the top end face of the upper needle sleeve and the bottom end face of the lower needle sleeve respectively, and the needle tube is in interference fit with a shaft hole of the middle shaft block. The upper end probe head and the lower end probe head of the coaxial spring probe are in clearance fit with a shaft hole of the upper shaft block and a shaft hole of the lower shaft block respectively, the middle shaft block is arranged on the combination portion of the upper probe sleeve and the lower probe sleeve, and the lower probe sleeve is provided with a telescopic sleeve which is connected with the lower probe head and prevents the lower probe head from shaking or shifting. The invention has the effect of improving the stability of the probe.

The invention discloses a double-frequency slot antenna structure with a back cavity and a design method, which are used for an omnidirectional communication system. The antenna can work in two frequency bands, the antenna comprises a disc metal cavity, eight arc-shaped gaps above the cavity, and some metal columns and metal sheets in the middle of the cavity, and the antenna feeds the gaps from the center of the bottom of the cavity in a coaxial probe feeding mode; a filtering mechanism is formed through a metal column and a metal sheet in the middle of the cavity, and high frequency is blocked through low frequency, so that high-band radiation waves are limited in the small cavity in the middle and then are radiated out from four first arc-shaped gaps above, and low-band radiation waves are radiated out from four second arc-shaped gaps above the whole disc cavity after passing through the filtering mechanism; high-frequency energy and low-frequency energy can be separated, different cavity sizes are formed at different frequencies, and working frequency radiation is controlled by combining the length of the gap.

The invention relates to the technical field of radio frequency measurement, and discloses a method for measuring the high-frequency characteristic of a radio frequency coaxial probe. The method comprises the following steps: acquiring high-frequency response data of a radio frequency coaxial probe, segmenting a full frequency band based on a predefined frequency band division strategy, and identifying a key frequency band region; according to the response amplitude and phase distribution of the key frequency band region, screening a reference frequency band and extracting an impedance reference value, optimizing impedance matching parameters of a non-reference frequency band based on the reference value, and generating a frequency band impedance optimization parameter set; recombining a full-band impedance distribution sequence according to the parameter set to generate an initial impedance matching scheme; and finally, monitoring the high-frequency transmission deviation under the initial scheme in real time, counting the impedance fluctuation quantity and the phase offset, and generating an impedance correction instruction. The method effectively improves the stability and reliability of the measurement of the high-frequency characteristic of the radio frequency coaxial probe by accurately identifying the key frequency band in a segmented manner, guiding the impedance parameter optimization by the reference value and combining a dynamic correction mechanism.

The invention relates to a microstrip patch antenna based on an antipodal double-helix groove, which comprises the antipodal double-helix groove, a patch, a substrate, a grounding plate and a coaxial probe, and is characterized in that the substrate is mounted on the grounding plate, the patch is mounted on the substrate, the antipodal double-helix groove is formed in the patch, and the coaxial probe sequentially penetrates through the grounding plate, the substrate and the patch; the coaxial probe is used for feeding the patch, and a radio frequency electromagnetic field is generated between the patch and the grounding plate. According to the microstrip patch antenna, the antipodal double-spiral grooves are formed, the path length of current flowing through the patch is increased, the resonant frequency of the antenna is reduced to a large extent, meanwhile, the good radiation characteristic is kept, the antenna radiation efficiency is high, the directional diagram is regular, and the electrical size of the microstrip patch antenna is reduced while the high radiation efficiency is kept.

The invention relates to a probe head, which comprises a probe seat, a plurality of vertical probes and a plurality of coaxial probes, the vertical probes slidably penetrate through guide holes of the probe seat, the lower ends of the vertical probes are used for contacting conductive contacts of a tested device, and each coaxial probe comprises a probe body and a tip unit arranged at the lower end of the probe body. The probe body comprises a plurality of conductors which are mutually insulated, the needle point unit comprises a first needle point and a second needle point which are electrically connected with the plurality of conductors respectively and are used for being in contact with a conductive contact of a tested device, and the plurality of coaxial probes comprise a first return probe and a second return probe which form a return probe pair and are used for being configured to be a local part of a return test path; therefore, the high-frequency loopback test requirement can be met.

The application discloses a dual-polarized microstrip patch antenna applied to a millimeter wave phased array, and belongs to the field of radio frequency front ends.The antenna mainly comprises two substrates and two patch structures, wherein the top patch is fed by two coaxial probes, the feeding port has two feeding slits, and the bottom patch is in a cross shape, which increases the cross-polarization ratio of the dual-polarized antenna radiation.The antenna realizes the dual-polarized characteristic at H plane + / -45 DEG, the 10dB relative bandwidth is 38.9%, and the radiation pattern half-power beam width is greater than 100 DEG. The antenna has the characteristics of simple structure and simple manufacturing, and can be rapidly printed and manufactured by adopting a planar microstrip structure.

The invention discloses a compact dual-frequency patch antenna based on a decoupling structure shaped like a Chinese character'tu ', which comprises a top metal layer, a dielectric substrate, a metal ground layer and a coaxial probe feed structure, and a decoupling structure shaped like a Chinese character'tu ', which is formed by symmetrically arranging four metal strips along the horizontal direction, is arranged between the two patches. The antenna can synchronously work at double frequency bands of 3.39 GHz and 5.45 GHz, an electromagnetic weak field area is formed at the position of the feed probe through the decoupling structure shaped like the Chinese character'tu 'to block coupling, and meanwhile, a radiation pattern is corrected by means of a symmetrical structure. The antenna has the advantages of being low in profile, compact in structure, good in dual-frequency decoupling effect and stable in radiation pattern, the integration degree of the dual-frequency antenna array can be improved, and the antenna is suitable for a wireless communication system.

The application relates to a frequency reconfiguration waveguide antenna based on bottom end metasurface switching, which comprises an antenna, a waveguide cavity and a metasurface; the antenna is a rectangular waveguide antenna; the waveguide antenna has a fixed feed port, that is, a coaxial probe penetrating through the waveguide; the waveguide antenna radiation aperture is a rectangular aperture; the metasurface is a surface attached with a special metal structure. A slide rail is embedded outside the bottom end of the waveguide, and the metasurface with a phase modulation structure can be pulled out or pushed in; by pulling out or pushing in the metasurface, the antenna has two working states, that is, working state A and working state B, which correspond to two reconfiguration frequency bands of the antenna respectively. In the application, the waveguide antenna can realize rapid reconfiguration of the working frequency through switching of the bottom end metal surface, and the radiation performance remains stable.

The invention discloses a miniaturized Beidou navigation antenna based on a composite material and a preparation method of the miniaturized Beidou navigation antenna. The antenna comprises a radiation patch, a composite dielectric substrate, a metal grounding plate and a feed structure which are sequentially stacked from top to bottom, the dielectric constant epsilon r of the composite dielectric substrate is 6.1, and the dielectric loss angle tangent tan delta is 0.012; the radiation patch is arranged on the upper surface of the composite dielectric substrate, a main body of the radiation patch is of a square sheet structure, twelve cutting grooves are uniformly formed in four edges of the radiation patch, each edge comprises a first cutting groove located in the middle and second cutting grooves located in the two sides of the first cutting groove, and a corner cutting structure is further arranged in the diagonal direction of the radiation patch; the feed structure comprises a coaxial probe and an SMA adapter, and the coaxial probe penetrates from the back surface of the metal grounding plate and is connected with the radiation patch after penetrating through the composite dielectric substrate; and the radiation patch is provided with a feeding point at a position deviating from the geometric center along the y-axis direction. The antenna is compact in structure, reliable in performance and good in environmental adaptability.

The application discloses a planar low-profile ultra-wideband tightly coupled wide-angle scanning array antenna, which comprises the following: the antenna unit comprises a first layer metal patch, a first layer dielectric substrate attached to the first layer metal patch, a second layer dielectric substrate arranged in attachment to the first layer dielectric substrate, a second layer butterfly metal patch arranged on one end surface of the second layer dielectric substrate, a third layer dielectric substrate arranged in attachment to the second layer metal patch, and a fourth layer dielectric substrate arranged in attachment to the third layer dielectric substrate; and a feeding assembly, which comprises a metal ground arranged on one end surface of the fourth layer dielectric substrate, a coaxial probe, a metalized via hole arranged around the coaxial probe, a third layer planar metal strip arranged above the fourth layer dielectric substrate, and a metal short-circuit probe arranged on the opposite side of the antenna unit. According to the application, the antenna has a good cross-polarization ratio, realizes the performance of ultra-wideband and wide-angle scanning, and has the characteristics of low profile.

The application discloses a dielectric constant measurement method based on an open coaxial probe and a neural network, and specifically comprises the following steps: calculating a data set 1 of complex dielectric constants in a target range, and calculating a data set 2 of reflection coefficients corresponding to different sample thicknesses; dividing the data set 1 and the data set 2 obtained in step 1 into a training set and a test set; training an F-NN network with the data set 1 as output and the data set 2 as input, and saving the network with the best training and test effect; training an ID-NN network with the data set 2 as output and the data set 1 as input, and bringing the network into the F-NN network trained in step 3, and saving the network with the best training and test effect; and bringing a to-be-measured solution into the ID-NN network obtained in step 4 after measurement and calibration, so that the corresponding dielectric constant can be obtained. The application can quickly and accurately measure the relative complex dielectric constant of a to-be-measured object, the method is flexible to realize, and is suitable for measuring the dielectric coefficients of various substances.

The invention relates to the technical field of radio frequency microwave circuits, and discloses a hybrid integrated millimeter wave coaxial radial triplexer, which comprises a first coaxial line, a dielectric substrate, three output circuits arranged on the dielectric substrate and a second coaxial line, and is characterized in that each output circuit comprises a coaxial probe, an arc strip line and a width abrupt change strip line which are connected in sequence, and at least one gap structure is arranged on the arc strip line. According to the invention, the concentric arc strip line which is only used for excitation signal transmission is arranged in the first coaxial line, and a circuit mode which can realize a band-pass filter structure is designed on the arc strip line, so that the signal excited and coupled by the coaxial probe is transmitted through the arc strip line, and the signal transmission efficiency is improved. According to the utility model, three paths of signals with different specific frequency bands can be respectively transmitted to the standard microstrip line connected to the outer side of the first coaxial line, which can effectively improve the problems of large design difficulty and design workload of a common port impedance matching network in the design of a traditional circuit structure mode.

The present invention discloses a rotary microwave filter power divider, which resonates with TM 010 The choke slot loaded circular waveguide cavity of the mode and the circular symmetric loaded circular waveguide cavity of the coaxial probe are coupled through a common metal ring. 010 The circular symmetry of the mode field, the external quality factor control of the output coaxial probe and the coupled equal-amplitude and in-phase field, and the internal field continuity provided by the choke slot simultaneously achieve the functions of filtering, power division and stable output signal during rotation, forming a rotary filter power divider with the characteristics of low cost, small size, low loss and simple structure.

The invention relates to a multi-layer film thickness high-precision measurement system and method based on low-coherence interference. According to the system, a low-coherence broadband light source, an optical fiber coupling module and one end of the forked end of a Y-type multimode optical fiber are sequentially and correspondingly arranged, the common end of the Y-type multimode optical fiber, a collimation module and an all-optical-fiber reflection type coaxial probe are sequentially and correspondingly arranged, the other end of the forked end of the Y-type multimode optical fiber is arranged corresponding to a spectrograph, and the spectrograph is connected with a data processing module; the all-fiber reflection type coaxial probe is used for vertically irradiating a collimated light beam to the surface of a tested multi-layer film structure sample and collecting reflected light of the tested multi-layer film structure sample, and the data processing module is used for carrying out Fourier transform on spectral data of the spectrograph and separating out optical path difference signals of all interfaces; and calculating the thickness information of the thin film in the measured multi-layer thin film structure sample. The structure is simple, the cost is low, rapid measurement can be achieved, the data analysis difficulty is low, and the thickness measurement accuracy and stability are high.

The invention relates to the technical field of wafer testing, and discloses a coaxial probe, a probe card and a testing system. The coaxial probe comprises a probe tip main body and an electrical interconnection structure. The needle point main body comprises at least one central conductor and an outer side base body; the central conductor is inserted into the outer base body; a test needle tip is formed at one end of the central conductor, is positioned on the outer side of the outer-side base body and is used for abutting against a to-be-tested device; one side of the electrical interconnection structure is connected with the other end, away from the test needle tip, of the center conductor, and the other side of the electrical interconnection structure is used for being connected with a test instrument. By forming the test needle tip at one end of the central conductor and arranging the electrical interconnection structure, the problem that the precision requirement of the needle tip and coaxial section integration process of the existing coaxial probe is increased greatly along with the rise of the working frequency band is solved. The problems that the integration process of the tip and the coaxial cross section of the existing coaxial probe is influenced by the coaxial cross section and tip manufacturing technology, the batch production cannot be realized, and the cost is high are solved.

The invention relates to a substrate integrated waveguide resonant cavity based on a spiral groove-shaped metasurface unit, which comprises through holes, the spiral groove-shaped metasurface unit, a coaxial probe, a top plate, a dielectric substrate and a grounding plate, the top plate, the dielectric substrate and the grounding plate are sequentially superposed from top to bottom, and the through holes penetrate through the top plate, the dielectric substrate and the grounding plate and are uniformly arranged along the edge of the top plate; the coaxial probe is arranged on the top plate, the dielectric substrate and the grounding plate in a penetrating mode, and the spiral groove-shaped metasurface units are periodically arranged on the top plate. The spiral groove-shaped metasurface units are periodically arranged on the top plate, so that the resonant cavity achieves the miniaturization effect of electric size reduction under the condition that the resonant cavity does not depend on a high-dielectric-constant dielectric substrate. The super-structure surface structure is formed by a conventional etching process, the manufacturing process is simple, and the cost is low; and in cooperation with a coaxial probe feeding mode, the structure is compact, and implementation is easy.

The invention discloses a compact all-metal high-gain filtering yagi antenna based on evanescent wave coupling, and belongs to the technical field of evanescent wave antennae, the compact all-metal high-gain filtering yagi antenna comprises a driving unit, a reflector, a connecting device and a coaxial probe, one end of the coaxial probe is located in the driving unit, and the other end of the coaxial probe penetrates through the bottom side of the driving unit and is located on the outer side of the driving unit; the connecting device is located between the driving unit and the reflector, and the two ends of the connecting device are connected with the driving unit and the reflector respectively. By means of the structure, the all-metal design is adopted, and the miniaturized high-gain design is achieved based on the evanescent wave coupling mechanism and the working principle of the yagi antenna; meanwhile, the antenna also has all-metal characteristics and out-of-band filtering response, and is suitable for miniaturized high-gain antenna design in high-power communication application.

The application belongs to the technical field of wireless communication, and provides a single-layer broadband omnidirectional circularly polarized antenna, which comprises a metal patch radiation structure, a dielectric substrate, a metal ground plate and a coaxial feeding probe; wherein the metal patch radiation structure is composed of a central large square patch 1-1, a small rectangular patch 1-2 and an L-shaped patch 1-3; through the structure design, the coaxial probe is fed in the center of the central large square patch to excite the current diverging to the four directions, so that the vertical omnidirectional radiation characteristic (current source radiation) is realized; then four rotationally symmetrical L-shaped patches are loaded at four corners to introduce the annular current (magnetic current source radiation), so that the horizontal omnidirectional radiation characteristic is realized; at the same time, the vertical omnidirectional radiation and the horizontal omnidirectional radiation present a time phase difference of 90°, so that the omnidirectional circularly polarized radiation characteristic is realized in the far field. In summary, the application realizes the broadband omnidirectional circularly polarized radiation, and has the characteristics of simple structure, wide band and high gain.

The invention discloses a broadband high-gain conformal end-direction scanning array antenna based on oblique units, and mainly solves the problem that conformal, broadband, high-gain and end-direction two-dimensional scanning cannot be considered in the prior art. The antenna comprises a plurality of basic units selecting low-profile broadband oblique antennas, each basic unit comprises an upper dielectric substrate (1), a lower dielectric substrate (2), an upper metal bottom plate (4), a lower metal bottom plate (5) and a coaxial probe (6), and the upper surface of the upper dielectric substrate is printed with a plurality of radiation units (3) and rectangular metal strips (7) which have the same structure and characteristics; each radiation unit comprises two circular radiation patches, and the connecting line of the circle centers of the two circular radiation patches is parallel to the rectangular metal strip. The radiation units are arranged on the curved surface conformal carrier in a coplanar mode according to a set mode so as to form a broadband high-gain two-dimensional scanning wave beam along the end direction of the conformal carrier through adjustment of an excitation phase. The antenna is small in size and low in profile, can improve the end radiation gain and broadband characteristics, guarantees the two-dimensional scanning function of the array, and can be used at the front end of an aircraft to improve the detection performance of the aircraft.

This invention relates to the field of antenna technology, and discloses a power-tolerant gain-improving phased array antenna element to meet the technical requirements of high-power phased array antenna systems for transmitting elements. The antenna element of this invention includes a coaxial probe, a metal ground plane, a main radiator, side radiators, an L-shaped platform, and a metal director. The metal director and the metal ground plane are connected by support columns. The metal ground plane adopts a truncated pyramidal symmetrical structure with grooves, and each edge has evenly distributed circular grooves to improve the isolation between array elements. Through holes are provided within the grooves for fixing the contact components on both sides of the metal ground plane. The main radiator and the side radiators are mirror images of each other with the metal probe as the center and have a lateral gradient section at the top. The top of the L-shaped platform forms a level plate with the main radiator. The common level surface of the tops of the L-shaped platform, the main radiator, and the side radiators is parallel to the front and back surfaces of the metal director and maintains a gap.

The embodiment of the invention provides an anti-fouling coaxial probe, and relates to the technical field of semiconductor testing devices, the anti-fouling coaxial probe comprises a coaxial spring probe body, an upper needle sleeve, a lower needle sleeve, an upper shaft block, a middle shaft block and a lower shaft block, the coaxial spring probe body comprises a needle tube, a lower needle head, an upper needle head and an adjusting spring located between the upper needle head and the lower needle head, the device further comprises an integrated dynamic cleaning device. The dynamic cleaning device comprises a sealing protective cover capable of stretching and retracting in the axial direction, the upper end of the sealing protective cover is fixed to the bottom of the lower needle sleeve, and the lower end of the sealing protective cover is connected to the lower needle head, so that the lower needle head, the lower end of the lower needle sleeve and the sealing protective cover jointly form a relatively-closed dynamic cavity. And a cleaning assembly for purging and cleaning the exposed surface of the lower needle head by using the air pressure change in the compression and extension process of the sealing protective cover is arranged on the sealing protective cover. The self-cleaning device has the effects of dynamically keeping self-cleaning online and preventing pollutant accumulation.

The invention belongs to the related technical field of online monitoring of the curing and forming process of polymer bonded explosive, and discloses a device and method for online measurement of the curing and forming process of polymer bonded explosive, and the device comprises a coaxial probe, a dielectric property measurement module and a curing degree online measurement and calculation module which are connected in sequence; the coaxial probe comprises an electrode, an insulating layer and a shielding layer which are coaxially arranged from inside to outside, and the electrode is located in the middle of the coaxial probe and forms an electric field loop with the shielding layer; the dielectric property measurement module is used for detecting the dielectric constant of the polymer bonded explosive at the corresponding position; and the curing degree online measurement and calculation module is used for calculating the curing degree of the polymer bonded explosive corresponding to the measurement position of the coaxial probe in real time. The device can realize on-line measurement of the PBX curing forming process, is suitable for directly measuring the curing degrees of different spatial positions under the actual curing forming working condition, is stable and convenient in measurement, is high in anti-interference capability, and is very suitable for industrial large-scale preparation and actual working condition application.

The invention discloses a circularly polarized antenna, and relates to the technical field of antennas. The circularly polarized antenna comprises a dielectric layer, a radiation layer and a grounding layer which are respectively arranged at two sides of the dielectric layer, and a feeder line used for connecting the radiation layer and the grounding layer. The first radiation patch in the circularly polarized antenna can radiate vertical polarized waves, and the second radiation patch can radiate horizontal polarized waves. Because the radiation layer can generate two kinds of polarized waves, the circularly polarized antenna can enhance the overall radiation capability. Moreover, the circularly polarized antenna provided by the embodiment of the invention adopts the coaxial probe for central feeding, and has the advantages of simple structure, low profile, circular polarization, high efficiency and the like.

The application relates to a metalized high-power logarithmic periodic antenna unit and array, and belongs to the technical field of microwave antennas. The antenna unit comprises a feeding coaxial probe, a feeding connection copper block, a metal feeding line and a metal logarithmic periodic dipole structure; the antenna as a whole adopts a full-metal structure without a dielectric plate, and the feeding mode adopts the metal feeding line taking air as the medium, so that the heat dissipation capacity and power capacity of the antenna are improved; the lengths of the antenna dipoles gradually increase from high to low, the dipole arms are folded inwards by 45 degrees with the set line as the central axis in the vertical plane, finally all the dipoles are located on two mutually perpendicular planes, and on the basis of the bottom several groups of dipole arms, the dipole arms are further bent by 90 degrees twice in the vertical direction to form C-shaped dipole arms; the structure effectively reduces the transverse size of the antenna unit, the coupling current between the array elements in the antenna array can be utilized to expand the antenna bandwidth to the low frequency. The application has the advantages of large antenna power capacity, small antenna unit and the like.

The present invention relates to the field of antenna technology, and specifically to a substrate-integrated waveguide slot antenna, comprising: a first metal plate, a first plate body, a second metal plate, a second plate body, and a third metal plate sequentially stacked and connected along a first direction, wherein a coaxial probe is provided on the first metal plate; a first power divider is provided on the first plate body, and a central through hole for the coaxial probe to pass through is also provided; a first coupling slot is provided on the second metal plate; an impedance matching slot is provided on the second plate body; and a plurality of groups of slot units distributed in an array are provided on the third metal plate. Based on the substrate-integrated waveguide slot antenna, the present application adopts a series-feeding form to design it into a traveling wave antenna array, so that it has wide-band characteristics, and at the same time solves the OSB problem of the series-fed antenna by arranging slot units arranged in an array.

This disclosure relates to a circular antenna comprising a coaxial probe for feeding the circular antenna with leakage waves and a substrate on one face of which is arranged an array of metallic strips and on the other face of which is arranged a ground plane. The metallic strips are disjointed from one another, and each metallic strip forms at least part of a ring. The position of a geometric axis connecting the coaxial probe to the center of the circular antenna is selectable from several possible positions, such that from one position to another among the possible positions, the circular antenna exhibits a different periodicity, where the periodicity is equal to the sum of the widths of the gaps between successive metallic strips and the widths of said metallic strips along the selected geometric axis. Figure to be published with the abstract: Fig. 1a

The application relates to the field of antennas and provides a microstrip patch antenna and a manufacturing method, wherein the microstrip patch antenna comprises a substrate, a metal ground plate, a radiation patch, an E-shaped branch, a coaxial probe and a coaxial connector; the metal ground plate is arranged on the lower surface of the substrate; the radiation patch is arranged on the upper surface of the substrate; a groove is formed in the radiation patch, the E-shaped branch is placed in the groove, and the E-shaped branch and the radiation patch are located on the same layer; the coaxial connector is arranged on the lower surface of the substrate, the outer conductor of the coaxial connector is connected with the metal ground plate, and the inner conductor of the coaxial connector is connected with the E-shaped branch through the coaxial probe. The microstrip patch antenna provided by the application has a small feeding structure area and can realize dual polarization on a single radiation patch.

The invention discloses a high-selectivity broadband three-mode filtering microstrip patch antenna based on a snakelike slot. The antenna comprises a single-layer dielectric substrate, a square microstrip patch arranged on the upper surface of the substrate, and a grounding plate arranged on the lower surface of the substrate. The microstrip patch is fed through the coaxial probe; two snakelike slots with identical sizes are respectively etched on radiation edges on two sides of the patch, the two slots on the same side are symmetrically distributed on two sides of a feed axis, and the slots on the radiation edges on the two sides are mutually symmetrical in position and opposite in bending direction. Three resonance modes with similar radiation characteristics are excited in a passband by loading the symmetrical snakelike slots, and a radiation zero point is generated on each of the two sides of the passband, so that broadband response, stable radiation, high frequency selectivity and high out-of-band rejection are realized. Compared with a traditional square microstrip patch antenna, the square microstrip patch antenna has wider bandwidth and better frequency selectivity and out-of-band rejection capability under similar sizes, and has structural and performance advantages.

The application discloses a Ka-band conical beam antenna, which is composed of a single-layer metal floor, a coaxial probe, a single-layer dielectric substrate and an antenna patch array. The single-layer metal floor is rectangular, a metal through hole is arranged at the center of the floor, an SMA joint is arranged at the bottom of the floor, the SMA joint is in contact with the floor and is connected with the coaxial probe. The upper layer of the dielectric substrate is the antenna patch array. The whole antenna is composed of eight impedance-matched antenna patch units on the dielectric substrate to form a Chinese character-shaped pattern. Each patch unit is composed of a rectangular microstrip antenna, a parasitic capacitance ring, a transmission microstrip line and an impedance-matching microstrip line. The antenna is connected with a signal from the SMA joint through the coaxial probe penetrating through the single-layer dielectric substrate and the single-layer metal floor. The application can realize the design requirements of a wide beam, high gain and low side lobe.