106 results about "Slot coupling" patented technology

The invention relates to a circularly polarized quasi-absorption filtering phased-array antenna. A unit of the antenna comprises a multi-layer dielectric substrate, a semi-cured layer, a metal floor, a stacked patch and an orthogonal H-shaped gap, the first dielectric substrate is provided with a parasitic square loop, the second dielectric substrate is provided with a cross-shaped strip, and radiation zero points are introduced to the upper and lower edges of a passband respectively; the 3dB orthogonal directional coupler and the L-shaped feeder form a feed network, circularly polarized radiation is realized through slot coupling, and an isolation port of the 3dB orthogonal directional coupler is connected with a 50-ohm resistor, so that the energy of a lower stop band is absorbed, the energy of an upper stop band is reflected, and a quasi-absorption filtering characteristic is presented; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good filtering performance, and when array scanning is 0-45 degrees, the overlapping impedance bandwidth is 12%, the axial ratio bandwidth is 15.8%, and the maximum scanning loss is 2.3 dB; the antenna is compact in structure and easy to process, has wide axial ratio bandwidth and good quasi-absorption filtering performance, and has huge potential in millimeter wave satellite communication application.

The application discloses a Ka dual-circular polarization antenna unit and a flat plate array antenna, which comprises, from top to bottom, a radiation patch layer, a slot coupling layer, a waveguide transmission layer and a feed network layer; a plurality of microstrip line structures are arranged on the radiation patch layer, the microstrip line structure comprises a first microstrip line and a second microstrip line, and the first microstrip line and the second microstrip line form a 90-degree phase difference of electric field orthogonal components; the slot coupling layer comprises a second substrate, the second substrate is provided with a source collapse groove corresponding to the microstrip line structure, and the slot coupling layer and the radiation patch layer are relatively displaced under the action of an external force; the microstrip line structure corresponding to the source collapse groove is switched between a left-handed circular polarization microstrip line and a right-handed circular polarization microstrip line through the relative displacement; and the source collapse groove and the first substrate form a linear polarization feed source. According to the application, each dual-circular polarization feed source is used to form dual-circular polarization, and a polarization partition plate of a feed source waveguide is not relied on, so that the thickness of the antenna structure is reduced.

The invention discloses a broadband circularly polarized magnetoelectric dipole antenna with superposed Ka-band radiation modes, and belongs to the field of radio frequency front-end devices. The antenna is composed of an electric dipole patch composed of a rectangular patch and a stepped patch, a magnetic dipole radiator composed of four metal columns, an H-shaped slotted coupling floor, a feeder line, coaxial feed metal columns, an SIW structure, a metal ground backboard, an upper dielectric substrate, a lower dielectric substrate and a pp bonding layer, an antenna unit is subjected to 4 * 4 arraying, and the circularly polarized radiation performance of the antenna unit is verified. According to the invention, the circularly polarized wave beam range is wide, and the axial ratio bandwidth is 3GHz to cover the complete working frequency band. After the array is formed, the active S parameters of the array elements are well matched, and the excellent axial ratio performance is still achieved during beam scanning.

The invention provides a low-profile circularly polarized antenna unit for slot coupling feed and an array thereof, and the antenna unit employs a plurality of metal layers which are coaxially arranged, are sequentially stacked up and down and are separated through dielectric layers, thereby achieving the high integration of a feed network, a coupling structure and a radiation unit in the vertical direction of the antenna unit. Specifically, the parasitic patch and the radiation patch which are stacked and coupled up and down are adopted, so that the working bandwidth of the antenna unit is expanded; furthermore, the interference of a feed network on the radiation performance of the antenna is reduced through the separation of the upper metal ground and the lower metal ground, and meanwhile, two orthogonally distributed gap structures formed in the upper metal ground are matched with the microstrip transmission line to perform coupling feed, so that the circular polarization performance of the antenna unit is improved; in addition, periodically arranged metallized shielding through holes are formed in the edges of the antenna units, so that surface wave propagation and electromagnetic coupling between the units are effectively inhibited, and the performance stability of the antenna unit during large-angle scanning is improved while the low-profile characteristic of the antenna unit is ensured.

The invention discloses a broadband wide-angle scanning phased-array antenna unit and an antenna array, and belongs to the technical field of antennae, the broadband wide-angle scanning phased-array antenna unit comprises a first substrate layer, a second substrate layer, a first metal ground layer, a third substrate layer and a fourth substrate layer which are arranged in sequence; the first substrate layer, the second substrate layer, the first metal ground layer and the fourth substrate layer are respectively provided with a parasitic patch, an antenna radiator, a coupling gap and a strip-shaped feeder in a laying mode. And the strip-shaped feeder feeds through a feeding point on the back surface of the fourth substrate layer, feeds to the antenna radiator through the coupling gap, and finally feeds to the parasitic patch through coupling of the antenna radiator, so that electromagnetic signals are radiated outwards. According to the slot coupling feed structure, the impedance matching between the feed structure and the radiation structure is remarkably improved, and the antenna performance is greatly improved.

This application provides a dual-polarized differential base station antenna, relating to the field of communication technology. The dual-polarized differential base station antenna includes a dielectric substrate, a first resonant cavity, multiple second resonant cavity groups, a coupling component, and a coaxial feed conductor. The first resonant cavity is disposed inside the dielectric substrate and extends to the upper and lower surfaces of the substrate. A first radiation slot is provided on the upper surface of the first resonant cavity. Multiple second resonant cavity groups are symmetrically distributed around the first resonant cavity. Each second resonant cavity group includes at least one second resonant cavity, and a second radiation slot is provided on the upper surface of each second resonant cavity. The coupling component connects the first resonant cavity to each second resonant cavity group. The coaxial feed conductor is connected to a ground plane and penetrates the dielectric substrate to connect to the upper surface of the first resonant cavity. The dual-polarized differential base station antenna of this application achieves high gain, high isolation, and wide bandwidth performance while maintaining a low profile structure.

The invention discloses a unilateral excitation independent dual-polarization beam-forming transmission and reflection integrated array antenna which comprises a high-isolation dual-polarization feed source and a metasurface. The feed source adopts orthogonal I-type slot coupling and double-layer orthogonal feed, and the port isolation is superior to 50dB. According to the dual-polarization feed antenna, the radiation patch is coupled and excited through the orthogonal I-type slot on the grounding plate, and the SMA side feed is coupled through the orthogonal feeder lines above and below the double-layer substrate. The metasurface reflection subsystem is an X-direction bow-tie-shaped multi-layer stack, and the transmission subsystem is a Y-direction oval multi-layer stack. The antenna works in an X wave band, and the frequency bands of the two ports are 9.98 GHz to 10.65 GHz and 9.67 GHz to 10.58 GHz. The excitation reflection gain of the port 1 is 20.2 dBi, and the excitation transmission gain of the port 2 is 20.3 dBi. The antenna has the characteristics of high gain, dual polarization independence, reconfigurable beams in different directions, high isolation and flexible beam regulation and control, and is suitable for systems of multi-beam communication, directional networking and the like.

The invention provides a broadband horizontal polarization waveguide slot antenna array, which comprises a radiation slot layer, a slot coupling layer, a feed network layer and a standard waveguide interface, and is characterized in that the radiation slot layer is provided with 16 independent ridge waveguides, 16 V-shaped slots are cut on each ridge waveguide, each ridge waveguide is blocked by three cavity isolation walls to form four ridge waveguide sections, and each cavity isolation wall is provided with one V-shaped slot. Four V-shaped slots are distributed on each ridge waveguide section, 64 I-shaped coupling slots are formed in the slot coupling layer, the I-shaped coupling slots are located under the ridge waveguide sections, and the feed network layer adopts a flattened narrow-edge ridge waveguide design. Comprising a five-order one-to-two ridge waveguide power divider, a ridge waveguide-to-common waveguide converter, a multi-branch waveguide impedance transformer and an E-plane T-shaped joint. The antenna has the beneficial effects that the antenna is light in weight and low in profile; the antenna bandwidth is improved; the antenna structure is simple.

According to the TE20 mode LTCC patch antenna and radar based on the SIW structure, the SIW structure is applied to a reverse phase balance feed network and a slot coupling patch antenna, is applied to a high-gain TE20 mode LTCC patch antenna array with the frequency band of 77-81GHz and is packaged in an integrated antenna, and the TE20 mode LTCC patch antenna and radar based on the SIW structure have the performance of high gain and wide frequency band; the SIW structure and the LTCC multilayer structure are combined to realize a high-performance, miniaturized and highly integrated high-frequency microwave device, which is an important innovation in the technical field of radio frequency and microwave. The LTCC technology adopted by the invention can realize stacking of multiple layers of ceramic substrates, and provides a basis for manufacturing a multilayer SIW device; the SIW structure realizes a complex waveguide structure on the LTCC substrate, the performance and efficiency of the device are improved, and the formed array antenna has unique advantages in the development of millimeter wave packaging antennas.

The application belongs to the field of satellite mobile communication, and specifically provides a wide-beam metal-resistant antenna for satellite communication to overcome the problem that communication is interrupted under the interference of a metal environment for the existing satellite communication antenna. The application adopts a design of laminated slot coupling feed, improves the back and forward radiation of the antenna through a metal reflector plate and a forward radiation plate to improve the gain, generates 90 degrees of self-phase shift through a Wilkinson power divider, feeds a rotationally symmetrical "H" type slot at the same time, introduces a metal aluminum ring to pre-compensate the metal environment, reduces the influence of the surrounding metal floor on the antenna, and the metal reflector plate and the conductive metal aluminum ring together form a magnetic dipole, which is complementary to the directional diagram of the feed plate as an electrode to widen the lobe and improve the gain at a low elevation angle. Furthermore, the application has the advantages of wide beam, good low-elevation circular polarization performance and metal resistance, and is more suitable for satellite communication in actual scenarios.

The utility model discloses an external antenna and network equipment, and relates to the technical field of communication, the internal part of the external antenna is composed of a metal assembly, a second permanent magnet material and a slot coupling feed unit are embedded in the metal assembly, and a first permanent magnet material and an antenna switching unit are arranged in one side of a shell of the network equipment; when the first permanent magnet material and the second permanent magnet material are attracted, the antenna switching unit is electrically connected with the slot coupling feed unit. The effect of automatically switching the external antenna is achieved while the installation inconvenience caused by manual screwing is avoided, and the intelligent degree of antenna switching is improved.

The invention provides a microwave common-time double-frequency miniaturized radiator. According to the miniaturized radiator, two transistors are adopted to respectively construct negative resistance circuits to compensate resonator energy loss of a microwave common-time dual-frequency oscillator, and then output signals of SIW resonators are radiated and output through metal patches coupled through cross slot gaps. Comprising a high-frequency-band active negative resistance circuit, a high-frequency-band input blocking capacitor C1, a low-frequency-band active negative resistance circuit, a low-frequency-band input blocking capacitor C2, a high-frequency-band input matching circuit, a low-frequency-band input matching circuit and an SIW dual-mode dual-frequency radiation type resonator. According to the invention, the dual-mode resonator gap coupling metal patches are adopted to realize the function of common-time dual-frequency oscillation signal radiation output, and the oscillation signal obtained by radiation has the advantages of high output power, high isolation and low phase noise.

The application discloses a frequency-adjustable decoupling patch antenna array, which comprises frequency-adjustable patch antenna units, an adjustable open-circuit microstrip decoupling structure and a microstrip line-slot coupling feeding structure, wherein the adjustable open-circuit microstrip decoupling structure is arranged between the frequency-adjustable patch antenna units, the adjustable open-circuit microstrip decoupling structure utilizes the adjustment capability of a variable capacitance diode Cv1 on the antenna operating frequency and the differential mode impedance of the array, and the following effect of the variable capacitance diode Cv2 on the common mode impedance of the array following the differential mode impedance when frequency modulation, and the cross-polarization suppression effect of the microstrip line-slot coupling structure are combined, so that the frequency-continuously-adjustable decoupling patch antenna array is realized, and the decoupling depth, the adjustable bandwidth and the bandwidth in a single state can be considered.

The application relates to the technical field of antennas and discloses a spiral circularly polarized satellite communication antenna, an antenna array and a UAV, which comprises a feed medium substrate, a metal ground plate is arranged on the first end face of the feed medium substrate, a dumbbell-shaped slot coupling structure is etched on the metal ground plate, a feed network input piece and a feed network output piece are arranged at intervals on the second end face opposite to the first end face; the feed network output piece is located in the middle part of the feed medium substrate, and the projection of the feed network output piece on the plane of the metal ground plate is perpendicular to the slot coupling structure; and a flexible medium substrate cylinder is vertically connected to the metal ground plate, metal radiation arms are spirally arranged on the outer surface of the flexible medium substrate cylinder, and the metal radiation arms are connected to the opposite two side end parts of the feed network output piece through metal connecting pieces. On the basis of providing stable circularly polarized radiation performance, the antenna structure is miniaturized by effectively simplifying the feed structure.

The application discloses an electronic device, a first radiator includes a first end and a second end arranged oppositely, and a connection point and a feed point arranged between the first end and the second end; a signal source is electrically connected to the feed point; a second radiator includes a third end and a fourth end arranged oppositely, the third end is coupled to the second end through a gap, and the fourth end is grounded; one end of a first switch circuit is electrically connected to the connection point, and the other end of the first switch circuit is grounded; one end of a second switch circuit is electrically connected to the first end, and the other end of the second switch circuit is grounded; a working mode of an antenna assembly includes a first working mode and a second working mode, in the first working mode, the first switch circuit is in a conduction state, and the second switch circuit is in a disconnection state; in the second working mode, the first switch circuit is in a disconnection state, and the second switch circuit is in a conduction state. The application provides an electronic device with an antenna assembly maintaining good antenna performance.

The invention discloses a millimeter wave ultra-wideband substrate integrated coaxial line antenna array based on a laminated metasurface. The ultra-wideband antenna array comprises a coplanar waveguide-to-substrate integrated coaxial line switching structure, a one-to-eight power divider based on a substrate integrated coaxial line structure, a butterfly coupling slot and a laminated metasurface antenna, after being fed in by the coplanar waveguide, energy is transmitted to the substrate integrated coaxial line power divider through the blind hole structure, and is uniformly distributed to eight channels in the substrate integrated coaxial line power divider; and then, the energy is coupled and fed to the laminated metasurface antenna through the coupling slot. The antenna can stably work in the frequency range of 15.84 GHz-49.15 GHz, the return loss (S11) is always lower than 10 dB, and the corresponding relative bandwidth is 102.5%. In a target working frequency band, the maximum peak gain of the antenna can reach 18.58 dBi, and the antenna has excellent ultra-wideband characteristics and good radiation performance.

The invention discloses a dual-polarized waveguide slot planar antenna array, which comprises a first waveguide power division network assembly, a second waveguide power division network assembly, a third waveguide power division network assembly, a radiation cavity assembly and a radiation slot assembly which are sequentially overlapped and connected from bottom to top. The first waveguide power division network assembly, the second waveguide power division network assembly, the third waveguide power division network assembly and the radiation cavity assembly realize electromagnetic energy transmission through slot coupling. The radiation slot assembly is located at the uppermost part of the antenna, comprises a cross-shaped radiation slot which is stacked up and down, and is used for radiating the electromagnetic energy in the radiation cavity to a free space. The whole antenna array is of a low-profile flat plate structure, the size is compact, dual-polarization radiation of the antenna is achieved in the same radiation aperture, an all-metal guided wave structure can be adopted, and reduction of antenna loss is facilitated.

The application discloses a kind of full duplex antennas based on slot coupling differential feed, including two pairs of butterfly dipole antennas, first dielectric plate, four groups of vertically placed signal transmission lines, metal floor, second dielectric plate, two U-shaped feed networks and third dielectric plate;The application is placed on the upper surface and lower surface of first dielectric plate by setting two pairs of butterfly dipole antennas, to radiate horizontal polarization and vertical polarization wave, in order to generate differential signal, four T-shaped slots with the same size are etched on the metal floor, then the differential signal at T-shaped slot is transmitted to the feed position of dipole antenna by four groups of vertically placed transmission lines, and the two U-shaped feed networks are placed vertically without dielectric layer, so as to obtain larger port isolation, which can be applied to simultaneous same frequency full duplex communication system, and wireless signals can be transmitted and received simultaneously at the same frequency, thereby improving spectrum utilization efficiency.

The utility model discloses a millimeter wave antenna coupling slot structure with wide impedance bandwidth, which comprises a coupling slot arranged on the surface of a radiation patch, telescopic pieces used for changing the effective area of the coupling slot are arranged on the inner walls of the two sides of the coupling slot, and an antenna base is connected below the radiation patch through an adjustable assembly. Through the arrangement of the adjustable assembly and the telescopic pieces, the adjustable assembly can flexibly adjust the height of the radiation patch, so that the performance parameters of the antenna can be optimized, different working environments and application requirements can be met, meanwhile, the effective area of the coupling gap can be changed through the coupling gap and the telescopic pieces on the inner walls of the two sides, and the antenna is more compact. Therefore, the impedance matching and radiation characteristics of the antenna are adjusted, and the working efficiency and bandwidth of the antenna are improved.

The application provides a circularly polarized DRA array and communication equipment, the circularly polarized DRA array includes a feed plate, a plurality of metal plates installed on the first surface of the feed plate, a plurality of first fixing members, a plurality of SIW power dividers respectively installed on the corresponding metal plates, a plurality of second fixing members and a fixing plate erected on the plurality of SIW power dividers, the first surface of the feed plate is provided with a microstrip power divider, the second surface of the feed plate is provided with a microstrip slot coupling, the microstrip power divider is signal connected with the microstrip slot coupling, the metal plate is provided with a feed slot, wherein the microstrip power divider corresponds to the feed slot on the plurality of metal plates respectively, the plurality of SIW power dividers are fixedly connected with each other through the plurality of first fixing members, the fixing plate is fixedly connected with the feed plate through the plurality of second fixing members, the fixing plate and the feed plate clamp the plurality of SIW power dividers in cooperation, and the compact antenna structure is adopted to realize circular polarization, high frequency band coverage and high gain effect.

The embodiment of the present application relates to the technical field of antenna, and discloses a dual-frequency dielectric resonant antenna, which comprises a substrate, a feeding unit and an antenna unit; the substrate is provided with a plurality of feeding slots; the feeding unit is arranged on the substrate and is coupled with the feeding slots; the antenna unit comprises a plurality of dielectric resonators, the plurality of dielectric resonators are arranged on the substrate, and the plurality of dielectric resonators are sequentially connected in the same direction to form an integrated antenna unit, and one dielectric resonator is connected with one feeding slot.The embodiment of the present application sequentially connects the plurality of dielectric resonators in the same direction to form an integrated antenna unit, so that the integrated plurality of dielectric resonators only need to be bonded and fixed once, the installation of the antenna unit can be completed, the installation process is simplified, the installation alignment error caused by multiple installations of the antenna unit is reduced, and the performance simulation error and actual error of the antenna unit are avoided from being increased.

The invention discloses a low-profile broadband circularly polarized array antenna based on traveling wave slot coupling feeding. The array adopts a multi-layer structure and comprises a feed microstrip line layer, a first dielectric substrate, a metal plate with a cross recess, second to fifth dielectric substrate layers, a first metal sheet layer and a second metal sheet layer from top to bottom. The feed network realizes energy equal-amplitude in-phase and unequal-phase transmission through the first-stage T-shaped microstrip line and the second-stage unequal-length T-shaped microstrip line. The cross recess on the metal plate and the metalized through hole in the dielectric substrate work cooperatively to guide electromagnetic waves to radiate upwards and suppress transverse loss. The multiple layers of dielectric plates and the metal sheets are mixed and stacked and are arranged in a sequential rotation mode, so that the impedance bandwidth and the axial ratio bandwidth are effectively widened, and the antenna gain is improved. The antenna realizes the characteristics of high gain, wide bandwidth and low profile of 0.056 working wavelength under the center frequency of 7GHz.

This invention discloses a dual-polarized magnetoelectric dipole array antenna. The array antenna consists of antenna elements and a supporting structure. Multiple antenna elements are arrayed within the supporting structure. Each antenna element includes a radiating structure and a feeding structure. The radiating structure is a multi-layer structure with feeding structures arranged between its layers. The feeding structure employs dual-polarized microstrip feed lines. One side of each of the two microstrip feed lines is bridging and cross-laid on the lower surface of the bottom layer of the radiating structure. The feeding structure also includes two orthogonally arranged H-shaped coupling slots, which are arranged on the upper surface of the bottom layer of the radiating structure. This invention achieves ±45° dual-polarization through H-shaped slot coupling feeding and uses a slot coupling feeding and dual-polarized feed line co-layer design, compressing the antenna profile to 0.12λ0. The operating frequency band covers 3.2–5.36 GHz, the array antenna gain is better than 8 dBi, and the dual-polarization port isolation is better than 23 dB. It can simultaneously meet the requirements of the n78 and n79 frequency bands in 5G communication and is suitable for low-cost, miniaturized 5G base station equipment.

This invention discloses a method for operating in a circular waveguide TE 11 This invention relates to a millimeter-wave high-power rotating reflective waveguide phase shifter, belonging to the field of millimeter-wave transmission technology. It comprises a rectangular waveguide wide-side slot 3dB coupler, a rectangular-circular waveguide transition section, and a rotating circular waveguide phase shifting section, with its central plane divided into two symmetrical microwave channels. Electromagnetic waves are first injected through the first port of the rectangular waveguide wide-side slot 3dB coupler, then split into two paths entering the rectangular-circular waveguide transition section through the third and fourth ports of the coupler, and subsequently injected into the rotating circular waveguide phase shifting section. After propagating a certain distance within the two phase shifting waveguides, the waves are reflected by a rotating metal plate piston and finally output from the second port of the rectangular waveguide wide-side slot 3dB coupler. This invention modulates the phase at the output end by changing the electrical length of the electromagnetic wave propagating within the phase shifting section by rotating the position of the metal plate piston. Within the same operating frequency band, it possesses advantages such as high power capacity, compact structure, high phase shifting accuracy, and a large phase shifting range.

The invention relates to the technical field of antennas, in particular to a dual-band antenna based on a metal patch and a butterfly dielectric, which comprises a feed port, a dielectric substrate, a metal ground plane, a microstrip feeder line, an I-shaped slot, a rectangular metal patch, a triangular metal patch, a rectangular dielectric block and a cross dielectric radiator, according to the dual-band antenna, four groups of triangular metal patches and a cross-shaped medium radiator form a main radiation structure; the rectangular dielectric block is used as an electromagnetic energy conductor and transmits the energy coupled by the I-shaped slot to the radiation structure; the rectangular metal patch restrains electromagnetic energy and improves the radiation efficiency of the antenna. The novel design point is that the metal patch radiation and the medium radiation are combined to generate dual-band radiation, the design can be used in an antenna design system needing dual bands, the advantages of the metal patch radiation and the medium radiation are combined, and the antenna is suitable for more use scenes and requirements.

The application provides a novel ultra-wideband low-profile microstrip array antenna based on a gradient slot coupling, and relates to the technical field of antenna engineering. The novel ultra-wideband low-profile microstrip array antenna based on the gradient slot coupling comprises a ground plate, a lower dielectric, a gradient feed line, an upper dielectric and a radiation unit. The ground plate is provided with a gradient slot. The lower dielectric is arranged on one side of the ground plate. The gradient feed line is arranged on the side of the lower dielectric away from the ground plate. The upper dielectric is arranged on the side of the ground plate provided with the gradient slot. The radiation unit is arranged on the side of the upper dielectric away from the ground plate. In the application, the grid radiation unit is matched with the gradient slot coupling structure to reduce the circuit Q value and realize continuous impedance transformation. The impedance bandwidth is significantly widened while the low profile and miniaturization are maintained. The units are periodically arranged to form a surface array, the high gain and anti-interference requirements are met, and the application range of the antenna is effectively expanded.

The invention discloses a double-layer reflecting plate structure for effectively avoiding resonance points of an ultra-wideband oblique polarization array. According to the double-layer reflecting plate structure, resonance is suppressed and radiation characteristics are optimized through a double-layer reflecting plate and gap design. The structure is composed of a plurality of reflecting plate units, and each unit comprises an upper-layer reflecting plate, a lower-layer reflecting plate and a supporting column structure connecting the upper-layer reflecting plate and the lower-layer reflecting plate. Through slot coupling control, cavity height optimization and stepped reflection plate arrangement, resonance points of the ultra-wideband oblique polarization antenna are effectively suppressed, the consistency of a radiation pattern is improved, the cross polarization ratio is increased, and the ultra-wideband oblique polarization antenna is suitable for a high-frequency-band wideband communication system.

The invention relates to an antenna array and electronic equipment. The antenna array comprises a substrate and at least two layers of cavity antennas arranged on the substrate in a laminated mode, each layer of cavity antenna comprises at least one cavity arranged at intervals, and each cavity is provided with at least one opening. Wherein the cavities of at least one group of adjacent two layers of cavity antennas are coupled and fed through the slots to form a laminated multi-frequency cavity antenna array in a coupled feeding form, which is an effective solution for improving the bandwidth and performance of the cavity antenna, so that the occupied area of the cavity antenna can be reduced, and the bandwidth and the performance of the cavity antenna can be improved. And the radiation performance such as bandwidth and directivity of the antenna is improved.

The present disclosure provides a side-fed waveguide 1x4 circularly polarized antenna array and its application, which comprises: a power division feeding network comprising a primary power division network and a secondary power division network connected with the primary power division network; wherein the primary power division network adopts a side feeding mode, is used for realizing mode conversion from a coaxial line mode to a waveguide mode, and performing power division conversion on a fed-in signal to output a 1:2 primary power division signal; the secondary power division network is used for converting the 1:2 primary power division signal into a 1:4 secondary power division signal; and a four-ridge metal cavity circular polarizer is coupled and connected with the power division feeding network through a coupling gap, and is used for realizing circularly polarized radiation of the 1:4 secondary power division signal.

The application discloses a miniaturized metasurface antenna, which comprises three layers, namely a radiation layer, an air layer and a feed layer from top to bottom, wherein the radiation layer is provided with a metasurface radiation structure, and the feed layer is a microstrip line slot coupling feed structure; the metasurface radiation structure is composed of 16 square patches arranged in a 4*4 array, wherein a rectangular slot is loaded at the center of each square patch, and a branch is loaded at four corners; the metasurface radiation structure adjusts the equivalent capacitance of the metasurface antenna by changing the length and width of the loaded branch extending into the square patch; and the length of the current of the metasurface antenna is adjusted by changing the length and width of the rectangular slot. Compared with the existing conventional metasurface antenna, the metasurface antenna has the advantages of ensuring a wide impedance bandwidth and high gain of the metasurface antenna in the process of miniaturization.