971 results about "Feed network" patented technology

The present invention discloses a high polarization isolation dual-polarization tightly coupled ultra-wideband phased array antenna. It includes a dipole unit, a coaxial feed line, a metal reflective floor, a fishbone cross-shaped patch and a cross-shaped metal wall; the dipole unit includes a horizontal and two vertical dielectric substrates, and the vertical dielectric substrates are orthogonal to each other; two groups of coplanar and mutually perpendicular butterfly-shaped dipole units are printed on the lower surface of the horizontal dielectric substrate; a fishbone cross-shaped patch is embedded at the intersection of the ends of the dipole units, and there is a gap between the patch and the end of the dipole; a patch with an etched groove line is printed on one side of the vertical dielectric substrate; the patch is connected to the dipole; the microstrip line on the upper surface of the horizontal dielectric substrate is connected to the inner conductor of the coaxial feed line, and the dipole is connected to the outer conductor of the coaxial feed line; the fishbone cross-shaped patch is in contact with the cross-shaped metal wall. The present invention realizes high polarization isolation and low cross-polarization of the dual-polarization tightly coupled ultra-wideband phased array in a lower frequency band without the need for a complex feeding network.

The utility model discloses a double-frequency circularly polarized fusion antenna with a large frequency ratio, which comprises a first dielectric plate and a second dielectric plate, the first dielectric plate is positioned above the second dielectric plate, and the lower surface of the first dielectric plate is a copper-clad layer serving as a grounding plate. And a first metal radiator, a second metal radiator, a third metal radiator and a fourth metal radiator are arranged on the upper surface of the antenna. One end, close to the center of the dielectric plate, of the radiator is loaded with a metal column and connected with the grounding plate, and one end, away from the center of the dielectric plate, of the radiator is loaded with a millimeter wave metal probe. A microwave feed network and four 180-degree phase difference power dividers are arranged on the lower surface of the second dielectric plate, an output port of the microwave feed network is connected with the four microwave metal probes, and output ports of the 180-degree phase difference power dividers are connected with the eight millimeter wave metal probes. The dual-frequency circular polarization antenna has a dual-frequency circular polarization characteristic, can effectively reduce the influence of a multipath effect, and achieves the multiplexing of the radiator, thereby reducing the demands for the space resources of communication equipment.

The invention provides an antenna device and a base station antenna system, the antenna device comprises a reflection plate, a radiation unit and a feed network, and the reflection plate is provided with a first opening. The radiation unit comprises a radiation body and a feed branch knot, and the radiation body is coupled with the feed branch knot. The radiating body is arranged on one side of the reflecting plate, and a gap is formed between the radiating body and the reflecting plate. And at least part of the feed branch is arranged in the first opening in a penetrating manner. The feed network is arranged on the side, away from the radiation unit, of the reflecting plate, a gap is formed between the feed network and the reflecting plate, and the feed network is coupled with the feed branch knot. According to the antenna device, the radiating body located on one side of the reflecting plate penetrates through the first opening in the reflecting plate through the feed branch knot and then is in coupling connection with the feed network located on the other side of the reflecting plate, the structure of the antenna device is simplified, the number of parts is reduced, the weight is reduced, and overall assembly of the antenna device is facilitated.

The invention belongs to the technical field of communication, and particularly relates to an ultra-wideband miniaturized Vivaldi antenna. The antenna comprises a dielectric substrate, wherein the upper surface of the dielectric substrate comprises a main body Vivaldi antenna, four resistors, two rectangular metal patches and an artificial surface plasma, wherein the main body Vivaldi antenna is provided with an exponential gradually-changed slot; a feed network is arranged on the lower surface and comprises six impedance conversion microstrip transmission lines, a fan-shaped transmission line and a circular groove; the main body antenna and the dielectric substrate are placed in a centered alignment manner, the four resistors are placed at the tail end of the main body antenna, and the rear sides of the resistors are connected with the two rectangular patches; the artificial surface plasma is placed in the main body antenna gradual change gap; and the multi-section impedance transformer and the microstrip-to-slot line structure of the feed network are aligned with the circular slot of the main body antenna. According to the invention, the ultra wide band, miniaturization and high radiation gain are realized by designing the main body antenna, slotting the edge, loading the resistor, carrying out the artificial surface plasma and the like. The working frequency band of the antenna ranges from 0.2 GHz to 18 GHz, and the antenna has the characteristic of miniaturization.

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 invention discloses a phased-array antenna, the phased-array antenna comprises a plurality of antenna module units, each antenna module unit comprises a PCB and an integrated radome module, and the integrated radome module is arranged on the surface of the PCB; a feed network, a dielectric substrate and an antenna radiation patch are arranged on the PCB, and the PCB is used for realizing feed and partial radiation functions; the integrated antenna housing module comprises a honeycomb support, an antenna patch, a PET film and an antenna housing, the antenna patch is etched on the PET film, the honeycomb support, the PET film and the antenna housing are mutually connected to form an integrated structure, and the integrated antenna housing module is used for realizing wave transmission, bandwidth broadening and impedance matching. According to the phased-array antenna, the use cost of PCB materials is reduced, and the problem that the electrical performance of the phased-array antenna is reduced due to dielectric loss caused by excessive use of PCB materials is solved.

An antenna system includes a first antenna and a second antenna. The first antenna includes a first radiating element, a first frequency selective surface, and a first feed network. The first radiating element is disposed on a side of the first frequency selective surface, and the second antenna is disposed on a side that is of the first frequency selective surface and that is away from the first radiating element. The first frequency selective surface includes a plurality of first strip-shaped structures and a plurality of second strip-shaped structures. The first strip-shaped structures and the second strip-shaped structures are made of metal. The plurality of first strip-shaped structures intersect with the plurality of second strip-shaped structures to form a plurality of grids. The first feed network includes a first structure, and the first structure is disposed on the first strip-shaped structure.

This application describes multi-band antenna systems and base stations. An example multi-band antenna system includes: a plurality of radiating element arrays, feeding networks separately corresponding to the plurality of radiating element arrays, at least one layer of a frequency selective surface (FSS), and a reflection panel. The plurality of radiating element arrays are located above the reflection panel. All or some of the plurality of radiating element arrays are stacked. The at least one layer of the FSS is located between the stacked radiating element arrays. A feeding network corresponding to at least one radiating element array in the stacked radiating element arrays is electrically connected to the at least one layer of the FSS, or the feeding network corresponding to the at least one radiating element array is integrated on the at least one layer of the FSS.

The embodiment of the invention provides a feed network, an antenna device, an active antenna unit and communication equipment, and the feed network controls the phase state of a phase shifter through light, does not need to use a control line, enables the feed network comprising the phase shifter to adopt an inverted microstrip structure, and reduces the insertion loss between a radio frequency channel and an antenna.

Provided in the present application are a filter antenna, an antenna feed system, a base station and a communication system. The filter antenna in the present application comprises a radiating surface, a filter and a metal back cavity, wherein the radiating surface comprises a dielectric substrate, a feed network and a radiating structure, the feed network and the radiating structure being arranged on a surface of the dielectric substrate; the dielectric substrate covers the metal back cavity; the filter is accommodated in the metal back cavity; the feed network comprises a combination point and an adapter, the combination point and the adapter being connected by means of a conductive wire; the radiating structure comprises a feed patch, the adapter and the feed patch being connected by means of a conductive wire; and the filter comprises a probe, the probe being connected to the combination point. In the present application, a combination point is connected to a feed source by means of a filter, so that a feed network excites electromagnetic waves, and the electromagnetic waves are radiated by means of a feed patch. The filter antenna provided in the present application integrates a filter and a radiating surface, such that the filter antenna has a smaller size and lower loss, thereby helping to improve the integration level of an antenna feed system and thus realizing the miniaturization design of the antenna feed system.

Embodiments of this application provide a transmission line, a feed network, and an antenna apparatus. The transmission line is used for a radio frequency device. The transmission line includes a reflector, an insulation support, and a transmission structure. The transmission structure includes at least two side walls. The transmission structure is disposed on a surface of the insulation support, an included angle between two adjacent side walls of the transmission structure is greater than zero, and different side walls of the transmission structure are located on different surfaces of the insulation support. At least one surface of the transmission structure is disposed opposite to a part of a structure of the reflector, and a gap exists between the at least one surface of the transmission structure and the reflector. The transmission line has a small signal loss and occupies a small space.

The invention relates to the technical field of radio frequency integrated circuits, in particular to a harmonic suppression power amplifier combining a matching network and a feed network, which comprises a transistor, an input matching module, an output matching module, a stabilizing module and a bias module, the input matching module comprises a first parallel resonance unit, the first parallel resonance unit is used for second harmonic suppression, the output matching module comprises a series resonance unit and a second parallel resonance unit, the series resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic, and the second parallel resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic. The second parallel resonance unit is used for resonating at a third harmonic frequency and forms a high-impedance open circuit for the third harmonic, the output matching module is coupled to a drain electrode of the transistor, and the bias module comprises a grid bias sub-module and a drain bias sub-module. The grid bias sub-module is coupled to a connection node of the input matching module and the grid of the transistor, the drain bias sub-module is coupled to the output matching module, and the bias voltage of the transistor is jointly determined by the grid bias sub-module and the drain bias sub-module. The power amplifier has the effect of improving the efficiency level of the power amplifier while realizing harmonic suppression optimization.

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 provides a transmission line, an oscillator, a phase shifter, a feed network, an antenna and communication equipment. The transmission line comprises a first inner core which comprises a first main body surface, and the first main body surface is perpendicular to the thickness direction of the first inner core; the floor comprises a first slotted hole penetrating through the thickness of the floor, and the inner wall of the first slotted hole is coupled with the first main body surface to form a capacitor. According to the technical scheme, the tolerance sensitivity of the transmission line impedance can be reduced, the tolerance resistance of the transmission line is improved, and therefore the stability of the transmission line impedance can be guaranteed.

The invention relates to the technical field of wireless communication, and provides a vehicle-mounted satellite phased-array antenna and a beam forming method thereof, and the phased-array antenna comprises a plurality of antenna units and T / R assemblies which are correspondingly connected. The feed network is used for distributing signals from the beam forming network to each T / R component; and the beam forming network is used for calculating and distributing a phase to each T / R component, and adopting an adaptive beam forming algorithm to control the direction of a beam by adjusting the phase, so that the beam points to a required satellite or other targets. The phased-array antenna can form a plurality of transmitting wave beams and receiving wave beams with different directions through wave beam conversion in a repetition period, has rapid scanning agility capability, can change an antenna pattern function or an antenna wave beam shape through adjusting signal amplitude and phase in each unit channel in the phased-array array, and improves the antenna performance. The reliability is improved by omitting a mechanical driving system, and even if some nodes are damaged, the use of the whole function is not affected.

The invention discloses a feed network component, a phase shifter and an antenna device, which are used for solving the problem that the transmission efficiency is influenced by resonance formed in opposite areas of metal plates. The invention provides a feed network assembly, a feed network comprises a cavity and a transmission structure, the cavity comprises an accommodating cavity, and the accommodating cavity is used for accommodating the transmission structure; the cavity further comprises a first side wall, the first side wall comprises a first sub-side wall and a second sub-side wall which are oppositely arranged and capacitively coupled, and at least one of the first sub-side wall and the second sub-side wall which are oppositely arranged and capacitively coupled comprises at least one slot. According to the invention, the open grooves are formed in the first sub-side wall and the second sub-side wall which are oppositely arranged and are in capacitive coupling, so that the oppositely arranged areas are reduced, the resonance is reduced, and the transmission efficiency is improved.

A radio system includes a feed network, an edge wavelength switching system (EWSS), a photodetector, and a broadband lens-based antenna subsystem. The feed network aggregates a plurality of unmodulated optical carriers and modulated optical carriers for delivery to an optical link. The EWSS receives the plurality of unmodulated optical carriers and modulated optical carriers from the optical link, and selects a first unmodulated carrier and a first modulated carrier as a first selected optical carrier pair. The photodetector receives the first selected carrier pair from the EWSS and generates a first electrical signal from an optical beat of the first unmodulated carrier with the first modulated carrier. The broadband lens-based antenna subsystem receives the first electrical signal from the photodetector, propagates the received first electrical signal through a lens body, and outputs a first directional wireless beam signal containing signal data from the first modulated carrier.

An electronic device includes a housing, a feed network, and a circuit board. The shell is provided with an accommodating cavity, and a feed column and a grounding column are integrally formed on the accommodating cavity. And the feed network is connected with the feed column and is used for feeding the accommodating cavity. The grounding end of the circuit board is connected with the grounding column and used for releasing static electricity on the containing cavity. In the application, at least part of the area of the accommodating cavity on the electronic equipment is multiplexed as the radiator, so that the occupation of the space in the electronic equipment can be reduced to a great extent, and meanwhile, good antenna efficiency can be obtained. Wherein the feed column and the grounding column can be integrally formed in the processing and manufacturing process of the accommodating cavity, so that the continuity of the structure can be ensured, and the situation that connection gaps are generated among the accommodating cavity, the feed column and the grounding column to influence the distribution of antenna resonance is avoided. In addition, the grounding column on the accommodating cavity is connected with the grounding end on the circuit board, so that static electricity on the accommodating cavity can be timely conducted to the grounding end of the circuit board through the grounding column to be released.

The invention provides a wide-axial-ratio circularly polarized antenna, and relates to the technical field of antennas, and the antenna comprises a dielectric substrate, and the edge of the dielectric substrate is uniformly provided with metalized via holes; the radiation patch covers the upper surface of the dielectric substrate, and a first circular gap is formed in the middle of the radiation patch; the feed network is located on the lower surface of the dielectric substrate; the metal cover comprises a metal back cavity, the metal cover covers the bottom of the feed network and the bottom of the dielectric substrate, and the feed network is located in the metal back cavity; the radio frequency connector passes through the dielectric substrate and the radiation patch and is welded on the upper surface of the radiation patch; one end of the coaxial cable is connected to the lower end of the radio frequency connector, and the other end of the coaxial cable penetrates through the metal back cavity and is connected with the metal cover; the invention is used for solving the technical problems of low gain, narrow axial ratio beam width, complex design and manufacture and overlarge antenna size of the existing circularly polarized antenna.

The invention provides a low-cost dual-polarization electric scanning base station antenna applied to 5G communication, and provides an effective method for the design of a low-cost electric control scanning base station antenna. According to the invention, an antenna array surface is formed based on 2-bit dual-polarized microstrip antenna units, the antenna array surface and a feed network are in plug-in connection, and the feed phase of each antenna unit is controlled through an external wave control circuit board, so that phased wave beam scanning is realized. The base station antenna has the beneficial effects that compared with a traditional fixed beam base station antenna, the coverage range of the base station antenna can be effectively expanded; according to the invention, the microstrip antenna units are separated from each other and are not printed on a whole dielectric plate, so that the array scale can be flexibly controlled according to actual requirements; the antenna unit integrates two functions of radiation and phase shift, so that an external phase shifter is omitted, and the processing, assembling and maintenance costs are greatly reduced.

The invention relates to the technical field of phased-array antennas, in particular to a broadband phased-array antenna unit convenient to feed, which comprises an antenna unit, the output end of the antenna unit is electrically connected with a radiation patch, the bottom of the radiation patch is electrically connected with a grounding plate, the grounding plate is provided with a gap, and the gap is communicated with the antenna unit. The center of the antenna unit is provided with a center feed structure. According to the invention, by adopting a cross-shaped symmetrically distributed four-slot coupling feed mechanism and combining with a center combiner structure, the working bandwidth is expanded, the circular polarization characteristic is optimized, and meanwhile, the complexity of a feed network is remarkably simplified, the electromagnetic coupling design of the radiation patch and the double-layer grounding plate is matched with a surface slotting structure, so that the antenna efficiency is improved. According to the phased array system, the current distribution and the radiation efficiency are effectively improved, the feed regularity of the phased array system is ensured by the arrangement mode of rotary arrangement, and the radio frequency feed network adopts a multi-layer microstrip line and digital phase shift technology and supports low-loss and high-consistency signal distribution and phase control.

Omni-directional, horizontally polarized antennas are provided. According to one aspect, an omni-directional, horizontally polarized antenna includes a first reflector and a second reflector separated from the first reflector. Disposed between the first and second reflectors are a planar array of radially directed horizontally polarized antenna elements and a planar feed network configured to feed the antenna elements of the planar array. A coaxial feed structure configured to communicate electrical signals to or from the feed network is provided.

The invention discloses a self-adaptive multi-unit very-low-frequency phased-array antenna system and a control method thereof, and the system comprises an antenna unit which comprises a vertical radiator and a top loading capacitor network erected on the vertical radiator; the central signal processing and distributing unit comprises parallel signal channels with the same number as the antenna units, and the signal channels are integrated with signal adjusting devices; the input end of the feed network is connected to the central signal processing and distributing unit, and the output end is connected to the vertical radiator to transmit a radio frequency excitation signal; the plurality of feedback sensors are arranged in the feed network and are used for monitoring electrical state parameters of signals flowing to the antenna units; the central control unit is connected with the feedback sensor and the central signal processing and distributing unit, monitors electrical state parameters based on the feedback sensor, and controls the signal adjusting device to adjust the amplitude and phase of the excitation signal. According to the invention, the beam forming and directional communication capabilities of the very-low-frequency antenna are realized, and the flexibility of an antenna system is expanded.

For improved Ku band communications, an antenna system includes a planar antenna surface, at least one waveguide feed network, and a waveguide. The planar antenna surface is coupled to at least one port. The at least one waveguide feed network includes an H plane junction splitter and at least two E plane junction splitters. The H plane junction splitter is disposed on a channel septum in a channel. A splitter axis of the channel septum and the H plane junction splitter is rotated about a P axis. The at least two E plane junction splitters are each disposed on septum and coupled to the H plane junction splitter via the channel. The waveguide is coupled to the waveguide feed network.

The invention relates to the field of packaged antenna arrays, and particularly discloses a fan-out type dual-polarization packaged antenna array integrated with a heterogeneous chipset. The packaging antenna array comprises three packaging bodies which are arranged from top to bottom, and a dual-polarized antenna array, a feed network and a heterogeneous chipset embedded in the packaging bodies are integrated in the packaging antenna array, so that high-density fan-out integration of the dual-polarized antenna array and the heterogeneous radio frequency front-end chipset is realized; the phased array module has lower transmission loss and higher integration level, not only can effectively reduce the size and cost of the system, but also has the characteristics of simple assembly process, high consistency, easy realization of random expansion of the array scale and the like, and can be applied to a large-scale phased array system as a standard module.

The invention belongs to the technical field of satellite communication and antenna arrays, and relates to a low-orbit satellite ultra-large folded array antenna beam and polarization adaptive calibration system. According to the system, through a feed network of an antenna and a coupler of a satellite-borne detection path, a Jones matrix of each array element is obtained by adopting time division multiplexing excitation, and amplitude and phase calibration in a substrate is realized by utilizing least square pseudo-inverse compensation. Self-adaptive fusion is carried out according to the energy of the left-hand and right-hand circular polarization channels, the residual error of a fusion signal and an ideal signal is calculated, and abnormal array elements are removed in combination with amplitude outlier and phase jump detection. Performing low-rank denoising and sparse correction processing on the phase residual error, calculating the plane coefficient of each substrate through weighted least square plane fitting, and realizing smoothing and compensation iteration by using Kalman filtering and phase updating constraint. And finally, correcting each array element by the spaceborne digital beam forming unit according to the calibration coefficient, thereby realizing accurate calibration of the antenna beam and polarization.

The invention provides a power divider, a feed network and an antenna system.The power divider comprises a metal floor and a metal strip line, the metal strip line is arranged on one side of the metal floor in the direction perpendicular to the metal floor, and the metal strip line comprises a power dividing node, an input port, a first output port and a second output port; the metal strip line between the power division node and the first output port is a first output line, the metal strip line between the power division node and the second output port is a second output line, the two output lines respectively comprise a first node and a second node, and the metal strip lines on the two sides of the first node and the second node are different in impedance. And the difference between the length of the metal strip line between the power division node and the first node and the length of the metal strip line between the power division node and the second node is an integral multiple of a quarter working wavelength of the antenna system. According to the power divider, the feed network and the antenna system provided by the embodiment of the invention, reflection standing waves of the power divider, the feed network and the antenna system can be reduced.

The power regulation network comprises a first input end, a second input end, a first output end, a second output end, a first phase shifting unit and a first switching unit, the first branch comprises a first input end and a first output end which are communicated; the second branch comprises a first input end, a first phase shifting unit, a first switching unit and a second output end which are communicated; and the third branch comprises a second input end, a first switching unit and a second output end which are communicated. When the first switching unit controls the second branch to be connected, the first power amplifier works; when the first switching unit controls the third branch to be connected, the first power amplifier and the second power amplifier both work. Therefore, when the number of the users is small, the first switching unit can control the second path to be connected, the first power amplifier to work and the base station to be in a low working power, the purpose of reducing the energy consumption of the base station is achieved, meanwhile, the formed beam range is not changed, and the communication quality of the users is guaranteed.

The invention relates to the technical field of electromagnetic fields and microwaves, and discloses a broadband high-integration-level dual-circularly polarized antenna which comprises an ultra-wideband self-compensation structure plane radiation surface, an ultra-wideband special-shaped reflection cavity, an ultra-wideband impedance transformer and an ultra-wideband integrated dual-polarized feed network. Wherein the ultra-wide-band self-compensation structure plane radiation surface is arranged at the forward position of the ultra-wide-band special-shaped reflection cavity, and radiation of ultra-wide-band dual circularly polarized waves is executed; the ultra-wide-band special-shaped reflection cavity executes matching and forward reflection of ultra-wide-band backward electromagnetic waves; the ultra-wideband impedance transformer executes radio frequency connection and impedance conversion between the ultra-wideband self-compensation structure plane radiation surface and the ultra-wideband integrated dual-polarization feed network; the ultra-wideband integrated dual-polarization feed network performs conversion from an unbalanced signal to a balanced signal and formation of a dual-circularly polarized signal. Unification of directional diagrams, polarization, axial ratio and standing wave bandwidth of more than 15: 1 frequency multiplication can be realized, and the ultra-wideband dual-circular polarization antenna has the advantages of ultra-wideband, miniaturization, constant wave beam and dual-circular polarization.

A circularly polarized antenna includes a plurality of radiation units configured in a rotational symmetry manner, and a feed network connected to the plurality of radiation units. Each radiation unit comprises a patch element and a short circuit wall which is connected with the patch element and is suitable for enabling the patch element to be short-circuited. Different from the traditional sequential phase feed, the sequential phase feed only depends on the physical length of the delay line to realize the phase change, and the reactance loading feed line ingeniously utilizes the equivalent capacitance and inductance to change the phase. The method does not need to depend on a long delay line, and stable phase difference can be realized in a wide frequency band.