175results about How to "Small VSWR" patented technology

The invention discloses a millimeter wave rectangular-circular transition integrated corrugated horn antenna and a processing method and adopts integrated disposable electroforming for processing. A shell is internally provided with an inner cavity communicating from top to bottom in the shell, and the inner cavity consists of a corrugated inner wall radiation section, a circular waveguide extension section, a rectangular-circular transition waveguide section and a rectangular waveguide extension section from top to bottom, and one end of the port of the rectangular waveguide extension sectionin the shell is assembled with a connection part through sleeve joint. The corrugated horn antenna is electroformed by an inner core with the structure the same as that of the inner cavity, the integrated structure is adopted instead of various independent parts, the discontinuity of inner section change and deteriorated smoothness of a transition part caused by the processing dimension difference of all components, assembly and positioning error and other reasons are avoided, voltage standing wave ratio is reduced and antenna performance is improved, and compared with the traditional discrete part scheme, the scheme also reduces the requirement on processing accuracy properly. In the invention, the antenna performance, production technology complexity and time cost are all improved.

The embodiment of the invention discloses a wideband dual-polarization array antenna and a base station, wherein the wideband dual-polarization array antenna includes an antenna unit, a metal reflection board, and a metal separation board, the antenna unit being separated by the metal separation board. The antenna unit contains a feed piece and a double-layer radiation patch. A first end of the feed piece is configured at the bottom radiation patch of the double-layer radiation patch so as to form a feeding point, and a second end of the feed piece is connected to a feed structure so as to form a feeding port. The bottom patch of the double-layer radiation patch is provided a slot at the upper surface thereof. A hole is opened within the slot to fixedly connect the fist end of the feed piece in order to form capative reactance. The embodiment of the invention form capative reactance by providing a slot on the upper surface of the bottom patch of the double-layer radiation patch of the array antenna, which enables an easy resonance in each radiation patch of the double-layer radiation patch of the array antenna. The array antenna can realize wideband with efficiency.

The invention provides a radio frequency coaxial electric coupler with a quick-locking device. The quick-locking device comprises a plug quick-locking device and a socket quick-locking device. The back of an elastic jack catch (16) of the plug quick-licking device is fixed on the plug outer conductor (11). The front portion of the elastic jack catch (16) extends with a snap joint (161). A cone face of the snap joint (1611) is arranged on the front lateral surface of the snap joint (161). The cone face of the snap joint (1611) of the elastic jack catch (16) enables the snap joint (161) to contract inward along the radial direction under the effect of the external force. The periphery of the elastic jack catch (16) is provided with a columnar-shaped unlocking sleeve (15). The plug quick-locking device refers to that a block groove (222) is formed on the front end of an outer conductor (22) of the plug along the axial direction. A catching groove (223) is formed radially outward on the wall of the block groove (222). The quick-locking device of the electric coupler has the advantages of being simple in structure, quick in product assembling, and saving the production cost of the quick-locking device.

The invention provides a handheld wave-absorbing material reflectivity measuring device. The handheld wave-absorbing material reflectivity measuring device comprises a metal test platform, a to-be-measured sample plate or a standard sample plate, a supporting cover, an arched guide rail, a near-field focusing antenna, a wave-absorbing partition plate, sliding blocks, a lifting rod, a push-pull rod and a receiving and transmitting module. According to the handheld wave-absorbing material reflectivity measuring device, the near-field focusing antenna which is a novel double-antipodal structure Vivaldi antenna replaces a horn antenna to serve as a receiving and transmitting antenna, the antenna is small in size and weight, and has the low standing-wave ratio in a wide band, the high gain and the low side lobe characteristic, a near-field linear polarization plane wave can be generated, the far-field radiation environment is simulated on a near field, a test area moves from an antenna far-field area to an antenna near-field area, and test space is reduced; due to reduction of the distance between the to-be-measured sample plate and the antenna, the to-be-measured sample plate can be more intensively irradiated through an electromagnetic wave, and the influence of background reflectance on the test accuracy is reduced; meanwhile, electromagnetic wave incidence and a reflection angle can be accurately adjusted, the accuracy of a receiving-and-transmitting antenna positioning angle is improved, and the complex rate of operation is reduced.

The invention discloses a stable phase center measurement antenna which is mainly used in the fields of geodesy and relevant subjects including marine geodesy, geophysical exploration, resource exploration, engineering surveying, engineering deformation, spacecraft docking and the like. The antenna comprises a metal base of the antenna and wave-absorbing material arranged on the upper surface of the outer edge of the metal base. The center part of the metal base is a round cavity, and a circuit board protection cover, a multi-feed slot antenna array, a supporting medium, annular wave-absorbing material in the cavity, a coaxial feed antenna and a radio frequency connector are installed in the cavity from top to bottom. Two round groove choking coils are contained between the round cavity and the outer edge of the base. The multi-feed point, wave-absorbing material and coking coil technologies are comprehensively adopted for the stable phase center measurement antenna, and thus the stable phase center measurement antenna has the advantages of being low in wide angle polarization axis ratio and high in phase center stability and can be used for various kinds of precision measurement for satellite navigation.

A tunable dual band antenna system is disclosed. The system includes a transceiver, a matching network and an antenna. The matching network is operable to tune the antenna to the transceiver at both a first and second frequency. Accordingly, the matching network has a variable capacitor, an inductor and a second capacitor. The value of the variable capacitor is chosen to tune the antenna at the first frequency and the second frequency such that the system can be used to transmit and receive electromagnetic energy over two bandwidths. The values of the variable capacitor, the inductor, and the second capacitor are chosen to minimize the standing wave ratio of the system at both the first frequency and the second frequency.

The invention discloses a super-surface lens antenna, and belongs to the technical field of antennas. The antenna consists of a conical-horn antenna and a wave beam focusing super-surface with the sub-wavelength thickness. The wave beam focusing super-surface is formed by a transmission-type linear polarization unit structure array with the parabolic-type cross polarization phase space distribution. The transmission-type linear polarization unit structure sequentially comprises a metal grid, a dielectric substrate, a metal elliptical opening resonant ring, a dielectric substrate and a metal grid from the bottom to the top. The size and period of the transmission-type linear polarization unit structure can change the working frequency band, bandwidth and the focusing efficiency of the wave beam focusing super-surface. According to the invention, the core component, the wave beam focusing super-surface, of the super-surface lens antenna is manufactured through the printed circuit board technology. The super-surface lens antenna is low in construction cost, employs a plane structure, has the sub-wavelength thickness, is light in weight, is small in size, is small in standing-wave ratio, is narrow in beam, is high in gain, and can be designed and implemented at any band.

The embodiment of the invention provides an antenna and a fabrication method thereof, and relates to the field of glass substrate antenna fabrication. By the antenna and the fabrication method thereof, the purposes of adjusting a resistance value of a glass substrate patch antenna on the basis of arranging a variable inductor and a variable capacitor without punching is achieved. The antenna comprises a first substrate, a second substrate, a first antenna electrode, a second antenna electrode, a microstrip line and a liquid crystal layer, wherein the first substrate and the second substrate are opposite to each other, the first antenna electrode is arranged at one side, far away from the second substrate, of the first substrate, the second antenna electrode is arranged at one side, far away from the first substrate, of the second substrate, the microstrip line is arranged at one side, near to the first substrate, of the second substrate, the liquid crystal layer is arranged between thefirst substrate and the second substrate, at least one driving electrode assembly is arranged between the first substrate and the second substrate, the driving electrode assembly is configured to adjust impedance of the antenna by controlling liquid crystal molecule deflection of the liquid crystal layer, and positive projection of the first antenna electrode on the second substrate and positiveprojection of the microstrip line on the second substrate are at least partially overlapped.

The present invention discloses an elliptic function low-pass filter path which is applied to a communication cavity device such as a mixer, a duplexer, a filter and the like. The elliptic function low-pass filter path comprises a cavity and a cover which covers the cavity. The cavity is provided with a vertical long cavity, and two sides of the cavity along a vertical long direction are respectively provided with two connecting ports. The cavity is provided with a conductor rod used for realizing electric connection between the two connecting ports. Along a conductor rod vertical long direction, the conductor rod is provided with a plurality of fixed-tuned discs. Each fixed-tuned disc is provided with an active-tuned disc correspondingly. Each active-tuned disc is connected with a corresponding tuning screw which passes through the cover. The fixed-tuned discs and the active-tuned discs are not contacted to facilitate capacitive coupling. The elliptic function low-pass filter path has the characteristics of simple structure, a flexible realization mode, good electrical performance and the like.

The invention provides a high-gain and high-power antenna based on materials with low refractive index. The method for designing the antenna comprises the following steps: (1) determining the working frequency f of the antenna; (2) selecting the corresponding waveguide, waveguide-coaxial transformer, transformer connector and impedance tuner according to the working frequency f thereof, so as to change the mode of the electromagnetic wave and match the impedance; (3) selecting a proper aperture A according to the geometric dimension limit and the directivity D of the antenna; (4) determining the geometric dimensions of the sub-wavelength artificial-structure material with low refractive index, wherein the material has the structure of a double-layer metal copper mesh, no dielectric medium is added between the two layers of the copper mesh, and the geometric parameters of the structure are mainly the period a of the copper mesh, the side length b of a hollow cavity, the thickness t of the copper mesh, and the distance Dis_layer between the two layers of the copper mesh; and (5) selecting the proper distance Distance between the material and the ground metal plate through simulation, and acquiring the maximum directivity and minimum standing-wave ratio (SWR) by adjusting the impedance tuner according to the tests. The invention can simultaneously guarantee the high gain of the antenna and increase the power of the antenna, and reduces the SWR of the antenna.

The invention relates to a microwave millimeter wave low-phase-different wide-frequency digit attenuation integral circuit, wherein it is formed by one or more attenuation integral circuits; said circuit is formed by two wide-band single-pole double-throw switches, reference micro band, resistance attenuation network, input / output and two controllers; the controller functions right signal on two single-pole double-throw switches, the reference micro band will be connected or stopped, and the attenuation network will be stopped or connected; two branches outputs signal with fixed attenuation values and fixed phase. The invention has simple structure and wide work frequency, etc.

The invention discloses an antenna tuning method, an antenna tuning circuit and an antenna tuning device, and belongs to the technical field of communication. The method comprises the following steps: receiving a signal output by an amplifier, and tuning the signal preliminarily through a tuning network; judging whether the standing wave ratio of the preliminarily-tuned signal is greater than a preset threshold; if the standing wave ratio of the preliminarily-tuned signal is greater than the preset threshold, gradually driving the tuning network to get the best matching tuning network parameters; and secondarily tuning the preliminarily-tuned signal based on the best matching tuning network parameters, and sending the signal out through an antenna. By detecting standing wave intelligently and matching the tuning network to the best, the standing wave ratio is smaller, and more energy is radiated out through the antenna.

The invention is a low-temperature extremely low-noise coefficient amplifying circuit and its character: it adopts microband mixing circuit, adopts high-Q value spiral inductance coil and high-Q value capacitor in the input matching network in order to reduce input circuit loss and then noise; the spiral inductance coil's two ends adopts double parallel microbnd line structure, reducing parasitic parameters; the microband length of the negative feedback network is less than 1 / 10 working wavelength, reducing parasitic vibration; it adopts small resistances in input and output matching networks, enhancing value of real part of impedance; in the output matching network, the resistances in series with main lines and branch lines are proper to make the gain larger; the input and output matching networks is connected to 1 / 4 working wavelength branch lines, reducing circuit size to make the circuit able to work at low temperature for a long period. It can meet the requirements of low noise, larger gain, low standing wave ratio, working at low temperature for a long time, etc.

The invention provides a fractal ultra-wideband antenna, and belongs to the technical field of wireless communication. The fractal ultra-wideband antenna comprises a dielectric slab (3), a radiating unit (2), a feed unit (4) and a grounding unit (6), the radiating unit (2) and the feed unit (4) are printed on one face of the dielectric slab (3) and are directly communicated, and the grounding unit (6) is printed on the other face of the dielectric slab. The radiating unit (2) is formed after iteration and fractal carried out twice or more than twice and is a communicated metal patch, and seams (1) are etched on in the radiating unit; the grounding unit (6) is a trapezoid metal patch, and a rectangular groove (5) is etched in the center of the edge of the upper bottom. The antenna has the advantages that an ultra wideband is available, multi-frequency work is achieved, directionality is good, the standing-wave ratio is small and good impedance matching is achieved; the structure is simple, the size is compact, the weight is low, loss is low and requirements of plane design are met; the manufacturing cost is low, precision is high, repeatability is good and the antenna is suitable for being used for small devices and can be conveniently produced in a large scale.

The invention discloses a novel high-isolation common-frequency dual-polarization horn antenna which comprises a first feed port (1), a rectangular waveguide-round waveguide converter (2) and a round horn (5), wherein the first feed port (1) is formed by a rectangular waveguide; the first feed port (1) is connected with one end of the rectangular waveguide-round waveguide converter (2); the other end of the rectangular waveguide-round waveguide converter (2) is connected with the round horn (5); a second feed port (3) is arranged on the rectangular waveguide-round waveguide converter (2); and the second feed port (3) is formed by a rectangular waveguide and an impedance matching bolt (4). According to the invention, due to the adoption of a crossfield feed technology, the antenna can work in the common-frequency dual-polarization environment, and the isolation is superior to 50dB, the standing-wave ratio is less than 1.3:1, the gain is about 20dBi and the antenna efficiency is more than 65 percent.

The invention discloses a left-handed circularly polarized antenna, which comprises an upper layer microstrip plate and a lower layer microstrip plate; The corners of the square corner-cut patches are distributed symmetrically around the center of the upper dielectric, and the corners of each parasitic patch are rotated 90 degrees in sequence along the left-handed polarization direction; the lower microstrip board is a double-layer board, and the lower dielectric There are feed network and four resonant patches on the upper surface, the four resonant patches are square corner-cut patches with diagonally cut corners, and the center of the lower medium is symmetrically distributed, and the four resonant patches are located in the corresponding Directly below the parasitic patch, 4 sets of patch units are formed with each corresponding parasitic patch. The feeding network adopts the serial continuous rotation feeding method, and feeds the four resonant patches according to the feeding sequence of 0°, ‑90°, ‑180°, and ‑270°.

The invention discloses a millimeter-wave multi-channel space waveguide power distribution synthesizer and a method. The power distributor comprises a four-channel waveguide power distributors and four two-channel waveguide power distributors, a first port, four second ports and a first power allocation part are arranged in the four-channel waveguide power distributor, the first power allocation part is used for dividing one path of signal of electromagnetic wave into four paths of signals in equal proportion, a third port, two fourth ports and a second power allocation part are arranged in the each two-channel waveguide power distributor, the third port is connected with each second port, the second power allocation part is used for further dividing the four paths of signals into eight paths of signals in equal proportion, each path of signal is separately subjected to power amplification, the single path of signal subjected to amplification pass through the power synthesizer having the same structure with the power distributor, and multi-path power synthesis of electromagnetic signals are completed. The millimeter-wave multi-channel space waveguide power distribution synthesizer has the advantages of wide band, high capacity, high isolation, high efficiency, low loss and the like.

This invention relates to RF range low-temp.l low-noise amplifier. According the connections of the feet of transistors, the types of the amplifier circuits are: input matching network, output matching network and negative feed-back network. This ivnented product can reduce noise of front part of the super-conduction receiver and to realize high sensitivity of the front part of the super-conduction receiver. It has advantages of small standing-wave retio (SWR), small size, long term stable working, e.g. when used ni CDMA, the SWR of input voltage <1.3, the output SWR<2.5, noise coefficient <0.3 dB, and long period working under 72K.

The invention relates to a wide-band low-temperature radio-frequency microwave power amplitude limiter with extremely-low insertion loss and belongs to the technical field of audio-frequency microwave power amplitude limiters. The amplitude limiter comprises four Pin amplitude-limiting diodes, two radio-frequency microwave blocking capacitors C1 and C2 and a quarter-wavelength micro-strip line, wherein the two capacitors are respectively connected with a radio-frequency microwave input-output end; the four Pin amplitude-limiting diodes are respectively connected inversely to form two groups of Pin amplitude-limiting diode pairs; the end I of the first group of Pin amplitude-limiting diode pair is connected with the end I of the quarter-wavelength micro-strip line and the end II of the capacitor C1, the end II of the Pin amplitude-limiting diode pair is connected with the ground; the end I of the second group of Pin amplitude-limiting diode pair is connected with the end II of the quarter-wavelength micro-strip line and the end I of the capacitor C2, and the end II of the Pin amplitude-limiting diode pair is connected with the ground. The amplitude limiter has an ultra-wide working band and extremely-low leakage potential, can be used for protecting a high-temperature super-conduction filter system working under a low-temperature vacuum environment from being burned out by strong signals.

The invention discloses a semi-flexible low loss coaxial radio frequency cable for a mobile base station. The invention is characterized in that: an inner conductor is a copper wire or a copper clad steel wire; and the inner conductor is coated with a composite insulating layer consisting of a first insulating layer and a second insulating layer, a shielding insulating layer, an outer conductor and an outer sheath layer from inside to outside sequentially. The invention has the advantages that expensive gold and silver are saved; the usage of polyfluortetraethylene ten times more expensive than polyethylene is greatly reduced; the cost is obviously reduced; and the cable has good shielding property, high using frequency, low loss, small attenuation and standing-wave ratio and long transmitting distance, can reduce the amount of the base stations in the coverage area and reduce the transmitting cost, and has obvious economic benefit.

The utility model has discloses a coupling output structure for traveling wave tube amplifiers, which comprises an input port and an output port; wherein, the radius of the output port is bigger than that of the input port, a first grade gradually variable circle waveguide and an Nth rank gradually variable circle waveguide are cascaded between the input port and the output port. The utility model adopts the double-segment correcting Duelfer-Chebyshev gradually variable circle waveguide cascade connection or a transition circle waveguide cascaded in the central section of the double-segment correcting duelfer-chebyshev gradually variable circle waveguide. The utility model has the advantages of resolving the problems in prior art , such as large size, high reflection coefficient of the input port and weak capacity of parasitic mode restraint; when the coupling output structure is applied to traveling wave tube amplifiers, positive effects can be obtained, , which are of great practical significance for developing the high power microwave sources applied in long ranged radars and electronic warfare technology.

The present invention relates to a high frequency self-lock connector, comprising a plug and a socket (16), wherein the plug (17) further comprising a plug sleeve connected with the plug housing (11) via an elastic member (10); a first contact member (8) is disposed within the plug sleeve (6); the first contact member (8) is fixed with respect to the plug housing (11); the first contact member (8) clamps the socket housing (3); a second contact member (9) is fixed on the plug housing (11) and connected with the first contact member (8) via the plug housing (11); the second contact member (9) abuts on an inner step of the socket housing (3); and the plug inner conductor (5) is in tight contact with the plug inner conductor (1). The connector of the present invention has a high vibration resistance, stable phase, quick connection, small SWR and good stability and is convenient for use.

The invention discloses a coaxial pulse voltage testing device which comprises a coaxial pulse probe, an AD circuit and a calibrating compensation module. Two connecting ends of the coaxial pulse probe are respectively connected to two ends of a tested circuit to obtain voltage waveform containing tested electromagnetic pulse information; the AD circuit is connected with the output end of the coaxial pulse probe and converts the voltage waveform output by the coaxial pulse probe into a digital signal; and the calibrating compensation module is connected with the output end of the AD circuit, processes the converted digital signal and reverts an original pulse waveform. The coaxial pulse voltage testing device is suitable for a very wide electromagnetic pulse frequency spectrum, can accurately test the electromagnetic pulse voltage signal of an ns-grade ascending edge, and has very high voltage withstanding property.

A tri-coaxial contact element is formed by sequential connection of an inner conductor layer, an inner dielectric body layer, a middle conductor layer, an outer dielectric body layer and an outer conductor from inside to outside; an abutting end is an elastic jack, and the other end is a lead compression jointing end; the tri-coaxial contact element formed by the connection of the inner conductorlayer, the inner dielectric body layer, the middle conductor layer, the outer dielectric body layer and the outer conductor has a right angle bent type structure; the lead compression jointing end thereof is simultaneously provided with a rear dielectric body and a connecting sleeve, wherein the rear dielectric body is installed inside the outer conductor, the small end presses the tail end of theinner conductor layer; the connecting sleeve is installed at the tail end of the rear dielectric body and is pressed tightly. The tri-coaxial contact element is compact in structure, extremely good in the consistency of characteristic impedance on a contact element, simultaneously has the characteristics of small standing-wave ratio, good transmission property and the like, and is suitable for being used as the contact element needing to conduct right angle bent type line outgoing.

The invention discloses an RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array. The RFID high-gain circularly polarized microstrip antenna array comprises a radiation plate and a reflection plate, wherein the radiation plate comprises a radiation plate dielectric substrate and four radiation units on the surface of the radiation plate dielectric substrate, a radiation unit feed point is arranged on each radiation unit, the reflection plate comprises a reflection plate medium substrate and a feed network on the surface of the reflection plate medium substrate, and the radiation unit feed points are connected with the feed network through support columns and signal wires on the support columns; supplementary angles are formed on two opposite angles of each radiation unit, the positions of the supplementary angles on the four radiation units are consistent, and circularly polarized radiation of antennas is realized by combining a one-point central feed way with the supplementary angles. In order to reduce a standing wave ratio and improve radiation efficiency, the RFID high-gain circularly polarized microstrip antenna array further comprises four tuning aluminum columns which are fixed on the radiation plate. The RFID high-gain circularly polarized microstrip antenna array disclosed by the invention has the advantages of high gain, low axial ratio, half-power wave bandwidth, wide radiation frequency and the like.

The invention discloses a microwave and millimeter wave wideband 5bit singlechip integrated digital phase shifter. The phase shifter is formed by the cascade of 11.25-degree, 22.5-degree, 45-degree, 90-degree and 180-degree phase shift circuits; high / low-pass filter topology is adopted in a 11.25-degree / 22.5-degree phase shift position; reflective topology design is adopted in 45-degree / 90-degree / 180-degree phase shift position; and the phase shifter totally can realize 32 phase shift states in a phase shift stepping value range of 0 to 360 degrees, the finally layout is arranged by the phase shifts from big to small, and the working frequency band of the phase shifter is 6 to 18GHz. The phase shifter has simple circuit topology and design process, simple manufacturing process, high yield, small chip area, wide working frequency band, low insertion loss, high phase shift precision, low input and outlet voltage standing wave ratio and small insertion loss difference of the phase shift states.

The invention provides a radio frequency electrodeless ultraviolet source and belongs to the technical field of microelectronics and photoelectronics of the electronic information technology. The problems that the power of a low-frequency electrodeless lamp is limited because of hard radiating, the EMC index is difficult to reach, selling price is high, and market promotion is hard are solved. According to the radio frequency electrodeless ultraviolet source, a method for improving working efficiency is used, a coil is used as a sending antenna, a metal shield grid layer is designed to improve light efficiency, a hollow-pipe-shaped core column is used as an effective radiating structure, and the electric design scheme meets the requirement for electromagnetic compatibility. The radio frequency electrodeless ultraviolet source comprises a bulb and a high-frequency electromagnet wave generator. The bulb is of a hollow pipe structure, a sending coil and the metal shield grid layer are arranged in a bulb body, and the high-frequency generator comprises a high-frequency circuit, a planar transformer, a power element and a socket. The radio frequency electrodeless ultraviolet source has the advantages of being high in light efficiency, small in heat emission amount, good in radiating and long in service life, the EMC index meets the national test standard, and development and production cost is low. The high-power ultraviolet source is great in performance.

The invention discloses a tunable high power waveguide band-stop filter comprising a main waveguide cavity with a left interface and a right interface, and at least two auxiliary waveguide cavities with same structures and respectively having one interface and a tuning structure; two opposite side faces of the main waveguide cavity are respectively provided with a rectangular coupling port, wherein the size of the rectangular coupling port is matched with an interface size of the auxiliary waveguide cavity; the auxiliary waveguide cavities are fixed on the rectangular coupling ports of the main waveguide cavity; the cavities of the main waveguide cavity and the auxiliary waveguide cavities are connected. The tunable high power waveguide band-stop filter is large in power capacity, strong in practicality, tunable in work frequency, and the whole filter is novel in structure, light in weight, and provides supports for micromation and integration of a subsequent system.

The invention discloses an antenna and a communication device. The antenna comprises a radiation sheet used for sending and receiving a radiofrequency signal, a radiation sheet reference ground oppositely arranged with the radiation sheet, a first transmission line used for transmitting the radiofrequency signal, a transmission line reference ground oppositely arranged with the first transmission line, a first connection portion connected with the first transmission line and oppositely arranged with the radiation sheet reference ground, and a first feed portion comprising a first transmission line feed portion and two first radiation feed portions, wherein the two first radiation feed portions are connected with the radiation sheet, and used for receiving the radiofrequency signal of the radiation sheet or transferring the radiofrequency signal to the radiation sheet; the first transmission line feed portion is connected with the first transmission line through the first connection portion, so as to mutually transmit the radiofrequency signal with the first transmission line; mutual coupled feed is carried out between the two first radiation feed portions and the first transmission line feed portion.