76results about How to "Feed loss is small" patented technology

The invention provides a waveguide flat array antenna, which has the characteristics of broadband and high-efficiency feed. Rectangular open waveguides 11 are used as radiation units; four rectangular open waveguides in one group form a sub array, and are arranged in a 2*2 rectangle and supplied with broadband equal-amplitude in-phase feed by a rectangular cavity 21; and in order to ensure efficient transmission of electromagnetic wave, the joint of each rectangular open waveguide 11 and the rectangular cavity 21 is provided with matched steps 13 and 23. The center of the rectangular cavity 21 is provided with a rectangular window 22 which is connected with a feed network of the next layer. In order to ensure smooth signals, a rectangular matching block 42 is arranged at the feed network corner connected with each rectangular window 22. The feed network consists of multistage parallel E-T so as to ensure that the antenna has enough bandwidth. The transceiving capacity of circularly polarized wave is realized by arranging a circularly polarized cover. Compared with the conventional flat antenna, the waveguide flat array antenna has broader bandwidth and higher feed efficiency.

The invention provides a circularly polarized waveguide flat plate array antenna, which has the advantages of high antenna efficiency and low manufacturing cost. A circular polarizer is arranged on a broadband linearly polarized waveguide flat plate array antenna 2 consisting of a rectangular open-ended waveguide 31 array excited by a waveguide feed network to achieve the high circularly polarized wave receiving and transmission capability of the circularly polarized waveguide flat plate array antenna. The size of the circular polarizer 1 is completely the same as that of a radiating layer 30, and consists of two layers of completely identical dielectric thin films 10 and a dielectric bulkhead 20 made from an acrylonitrile butadiene styrene (ABS) material, wherein an inclined cross pattern 11 is screen-printed on the dielectric thin film 10 by using conductive ink. Compared with a conventional circularly polarized flat plate antenna, the circularly polarized waveguide flat plate array antenna has the characteristics of great circular polarization bandwidth, low cost and low feeder loss.

A microstrip antenna using parasitical feed metal columns. The microstrip antenna includes four layers of dielectric plates, a radiating patch, metal floors, an SMP RF connector, a one-to-two power divider of a strip line form, a first feed metal column, a second feed metal column, a first parasitical feed metal column, and a second parasitical feed metal column. The antenna is additionally provided with the parasitical feed metal columns on the basis of a double-feed point circular polarization microstrip antenna, through electromagnetic coupling induction, the parasitical feed metal columns have electromagnetic field energy of a certain amplitude and phase, thereby changing surface current distribution of the microstrip antenna and electromagnetic field distribution between the microstrip antenna and the floors, so as to obtain a radiation pattern in rotational symmetry approximate to a ''four-feed point'' microstrip antenna, and at the same time, low elevation gain is improved, a feed network is simplified, feed loss is reduced, and the envelope size is diminished. The microstrip antenna using the parasitical feed metal columns in the invention is particularly suitable for occasions which have high requirements for miniaturization, rotational symmetry of a pattern and low elevation gain, and has popularization and application value.

The invention discloses a novel phased-array antenna based on a digital phase control electromagnetic surface. The novel phased-array antenna comprises a feed source and the digital phase control electromagnetic surface, the feed source is used for providing a space irradiation source for the digital phase control electromagnetic surface or receiving scattering electromagnetic waves of the digital phase control electromagnetic surface, and the feed source feeding mode is a reflecting type that the feed source is arranged in front of the digital phase control electromagnetic surface or a transmission type that the feed source is arranged behind the digital phase control electromagnetic surface. The digital phase control electromagnetic surface comprises a plurality of digital phase control radiation units, and each digital phase control radiation unit comprises a radiation module, a direct-current bias circuit and a digital control device integrated with the radiation module. The direct-current bias circuits are used for providing bias current for the radiation module. The radiation modules have different radiation phases under regulation and control of the digital control device. The novel phased-array antenna has the following advantages of being small in feeding loss, high in radiation efficiency, high in wave beam scanning speed, high in array scale extensibility, simple in structure, low in section, low in weight, easy to conform and low in cost.

The invention discloses a high-downdip electrically controlled base station antenna. The antenna comprises a reflection board, an array, a phase shift mechanism and an adjusting mechanism, wherein the array is arranged on one side of the reflection board and is provided with multiple dual-polarized vibrators; the phase shift mechanism and the adjusting mechanism are arranged on the other side of the reflection board; the phase shift mechanism is provided with a first shunt-feed strip-shaped wire and a first medium board; the first shunt-feed strip-shaped wire is connected with the dual-polarized vibrators, and is provided with a tap and multiple conduction bands reversely extending from the edge of the tap; the first medium board is simultaneously overlapped on at least part of the reversely extended conduction bands; and the adjusting mechanism is connected with the first medium board so as to drive the first medium board to move in the extension direction of the conduction bands. The antenna has the advantages that: the first shunt-feed strip-shaped wire is provided with multiple reversely extended conduction bands and the first medium board is simultaneously overlapped on the reversely extended conduction bands, so that the first medium board is matched with the reversely extended conduction bands to form multiple parallel-connection phase shift units, thus the feeding network layout is simplified, the feeding loss is reduced, the benefit is increased and the bandwidth is broadened.

The invention provides a reconfigurable array antenna based on a transmissive phased electromagnetic surface, comprises a feed source and an array antenna assembly, wherein the feed source is used forproviding a space illumination source for the array antenna assembly and receiving scattered electromagnetic waves of the array antenna assembly, and has the advantages of small feeding loss, fast beam scanning speed, strong array scale expansion, simple structure, low profile, light weight, easy conformal and low cost.

The invention discloses a wideband dual-polarized radiation unit used in a multi-frequency base station antenna. The wideband dual-polarized radiation unit comprises a radiator PCB, a balun, a metal feeding plate and a metal reflecting plate. The radiator PCB is formed through vertically combining radiator PCB upper-layer metal, radiator PCB dielectric layer and radiator PCB lower-layer metal. Theupper end of the balun is welded with the radiator PCB upper-layer metal. The metal feeding plate is fixed in the balun in an insulating manner. The lower end of the metal feeding plate is welded with the inner conductor of a coaxial line. The upper-end outer conductor of the coaxial line is welded with the lower end of the balun. The balun is fixed to the metal reflecting plate. The wideband dual-polarized radiation unit used in the multi-frequency base station antenna can cover a low-frequency full band of 690-960 MHz. The wideband dual-polarized radiation unit has advantages of realizing an excellent radiation characteristic in the wide band, reducing feeding loss and improving radiation efficiency of the antenna.

The invention discloses a thin-substrate phase amplitude correction slot line difference beam planar horn antenna, and relates to a horn antenna. The thin-substrate phase amplitude correction slot line difference beam planar horn antenna comprises a micro-strip feeder (2), a horn antenna body (3) and slot line horns (4), wherein the micro-strip feeder (2), the horn antenna body (3) and the slot line horns (4) are arranged on a dielectric substrate (1), the horn antenna body (3) comprises a first metal plane (7), a second metal plane (8) and two metallization through hole horn side walls (9), the horn antenna body (3) is provided with an odd number of metallization through hole arrays (11), and an even number of dielectric-loaded waveguides (15), the widths of the dielectric-loaded waveguides (15) on an aperture surface (10) of the horn antenna body (3) are equal, each dielectric-loaded waveguide (15) is connected with the slot line horns (4), a left-half antenna (13) and a right-half antenna (14) are arranged symmetrically, and the slot line horns (4) connected with the left-half antenna (13) and the slot line horns (4) connected with the right-half antenna (14) are arranged symmetrically. Electromagnetic waves can reach the slot line horns in an equal-amplitude and in-phase mode and then carry out radiation, and the direction of polarization of a radiation field is parallel to the dielectric substrate; the thin-substrate phase amplitude correction slot line difference beam planar horn antenna can be manufactured with the thin substrate, and is high in gain, large in zero drawdown, low in cost and compact in structure.

The invention provides an MST radar system based on a unit-level digital array, and a signal transceiving method. The radar system comprises: a plurality of antenna feed units, wherein each antenna feed unit transmits an electromagnetic wave signal to the outside and receives an echo signal reflected by the outside; a plurality of digital transmit-receive channels which are in one-to-one correspondence with the antenna feed units and are used for independently generating electromagnetic wave signals emitted to the outside and independently transmitting the echo signals; a digital beam formingunit respectively connected with each digital receiving and transmitting channel and used for generating a digital beam with specific directivity for the echo signal received by each digital receivingand transmitting channel; a signal processing unit connected with the digital beam forming unit and used for processing and calculating the received digital beams to obtain meteorological characteristics; and a main control unit respectively connected with the plurality of digital transceiving channels, the digital beam forming unit and the signal processing unit so as to send corresponding control signals.

The invention provides a thin-substrate phase correction slot-line planar horn antenna and relates to a horn antenna. The thin-substrate phase correction slot-line planar horn antenna comprises a micro-strip feeder line (2), a horn antenna body (3) and multiple slot-line horns (4) which are located on a dielectric substrate (1), wherein the horn antenna body (3) consists of a first metal plane (7), a second metal plane (8) and two rows of metalized via hole horn side walls (9). The horn antenna body (3) is provided with metalized via hole arrays (11) and dielectric-loaded waveguides (14), and each of the dielectric-loaded waveguides (14) on the caliber face (10) of the horn antenna body (3) is connected with one of the slot-line horns (4). Electromagnetic waves can reach to the slot-line horns in an in-phase mode and then are radiated, and the polarization direction of a radiation field is parallel to the substrate. The thin-substrate phase correction slot-line planar horn antenna can be manufactured by using the thin substrate and is high in gain, low in cost and compact in structure.

The invention discloses a high efficiency broadband dual polarization cavity array antenna. A rectangular open waveguide antenna is used as an array unit form, feed is performed through a strip wire,dual polarization feed is realized by a laminated structure of a multilayer PCB substrate, moreover, the strip wire is utilized to form a power divider feed network to expand a cell structure to a 16*4 antenna array, weighted processing based on the Chebyshev principle is performed on the power divide feed network to suppress the antenna sidelobe level, the antenna array is fed by an SMA connectorto improve portability of the antenna, and conversion from the strip wire to a coaxial wire is designed at a tail end of the feed network. The antenna is advantaged in that needs of a microwave system for polarization diversity are met, and electromagnetic performance superior to conventional antennas can still be obtained under limited physical conditions.

The invention discloses a thin-substrate phase amplitude correction oscillator planar horn antenna, and relates to a horn antenna. The thin-substrate phase amplitude correction oscillator planar horn antenna comprises a micro-strip feeder (2), a horn antenna body (3) and a plurality of oscillators (4), wherein the micro-strip feeder (2), the horn antenna body (3) and the oscillators (4) are arranged on a dielectric substrate (1), the horn antenna body (3) comprises a first metal plane (7), a second metal plane (8) and two metallization through hole horn side walls (9), the horn antenna body (3) is provided with metallization through hole arrays (11) and dielectric-loaded waveguides (12), on an aperture surface (10) of the horn antenna body (3), the widths of the dielectric-loaded waveguides (12) are equal, and each dielectric-loaded waveguide (12) is connected with the corresponding oscillator (4). Electromagnetic waves can reach the oscillators (4) in an equal-amplitude and in-phase mode and then carry out radiation, and the direction of polarization of a radiation field is parallel to the dielectric substrate; the thin-substrate phase amplitude correction oscillator planar horn antenna can be manufactured with the thin substrate, and is high in gain, low in cost and compact in structure.

The invention provides a radiation patch array and a planar microstrip array antenna. The radiation patch array is composed of n columns of radiation patch linear arrays. The radiation patch linear array is composed of m rows of radiation patch units. The radiation patch unit comprises a cross-shaped power division network and two rectangular patches. The cross-shaped power dividing network is ofa four-port structure, a left port and a right port are respectively connected with a rectangular patch, and the rectangular patches are excited in a parallel connection mode. And the upper ports andthe lower ports are respectively connected with the upper ports or the lower ports of the adjacent cross-shaped power division networks in the same column in series. The radiation patch linear array excites the rectangular patches in a parallel series feed mode, constructive radiation superposition is achieved in the wide edge direction of the rectangular patches, the length of a transmission lineis reduced by one time, meanwhile, the size of the antenna is reduced, and the cost of the antenna is effectively reduced. Meanwhile, because the feed loss is reduced, the noise performance of the array is improved, and the radiation efficiency and the gain bandwidth performance of the array are improved.

The invention relates to a horn antenna, in particular to a thin substrate phase-position correcting broadband difference beam plane horn antenna. The antenna comprises a micro-strip feeder (2), a horn antenna body (3) and logarithm periodical vibrators (4), wherein the micro-strip feeder (2), the horn antenna body (3) and the logarithm periodical vibrators (4) are arranged on a dielectric substrate (1). The horn antenna body (3) is composed of a first metal plane (7), a second metal plane (8) and two rows of metallization through hole horn side walls (9). The odd number of metallization through hole arrays (11) and the even number of medium filling waveguides (17) are arranged in the horn antenna body (3), and each medium filling waveguide (17) on a caliber plane (10) of the horn antenna body (3) is connected with the corresponding logarithm periodical vibrator (4). A left half antenna (15) and the logarithm periodical vibrator (4) connected with the left half antenna (15) are symmetrical with a right half antenna (16) and the logarithm periodical vibrator (4) connected with the right half antenna respectively. An electromagnetic wave can reach the logarithm periodical vibrators in an in-phase mode to be radiated, and the radiation field polarization direction is parallel to the substrate. A thin substrate can be used in the antenna, and the antenna is wide in bandwidth, high in gain, large in zero depth, low in cost and compact in structure.

The invention discloses a CTS array antenna system with a wide angle scanning function. A pair of quasi-planar wave discrete apparatuses are connected between a CTS antenna array surface and a slab waveguide feed source, so that discretization of the incident quasi-planar waves is realized, and a coaxial mode is converted, so that a conventional power division network is omitted; and by virtue ofan active assembly arranged between the pair of the quasi-planar wave discrete apparatuses, phase-control scanning of a wave beam is realized, thereby realizing relatively low feed loss and relativelylow heat consumption. Therefore, the CTS array antenna system with the wide angle scanning function disclosed in the invention has the characteristics of broadband, high gain and wide angle scanningand the advantages of low profile, low cost and low heat consumption.

The invention discloses a reconfigurable metasurface electric scanning array antenna based on double circular ring units, and relates to the technical field of array antennas. The antenna comprises a feed source and an array antenna assembly, the array antenna assembly comprises a plurality of digital radiation units, and the feed source is used for providing a space irradiation source for the array antenna assembly and receiving scattered electromagnetic waves of the array antenna assembly; each digital radiation unit comprises a dielectric layer and a radiation layer, the radiation layer is internally provided with a double-ring radiation structure formed by radiation patches, digital electric switches are embedded in the radiation patches, and the dielectric layer is internally provided with a direct-current bias circuit used for controlling on-off of the digital electric switches. The antenna is simple in structure, low in profile, light in weight, easy to conform and low in cost, and has the advantages of being small in feed loss, high in beam scanning speed and high in array scale expansibility.

The invention discloses a reconfigurable metasurface electric scanning array antenna based on an opening square ring, and belongs to the technical field of array antennas. The antenna comprises a feed source and an array antenna assembly, the array antenna assembly comprises a plurality of digital radiation units, each digital radiation unit comprises a dielectric layer and a radiation layer, an opening square ring radiation structure formed by radiation patches is arranged in each radiation layer, an electric switch is arranged on each radiation patch, and a direct-current bias circuit used for controlling on-off of each electric switch is arranged in each dielectric layer. According to the array antenna, the reflection phase or the reflection phase of each digital radiation unit on the electromagnetic surface is adjusted by using a digital control device, the whole surface is irradiated from the space by using a horn feed source, and the phase of each unit on the surface is adjusted in a digital control mode, therefore, high-gain focused dynamic scanning wave beams, agile wave beams or multiple wave beams are obtained.

The invention provides a thin-substrate amplitude correction broadband planar horn antenna and relates to a horn antenna. The thin-substrate amplitude correction broadband planar horn antenna comprises a micro-strip feeder line (2), a horn antenna body (3) and multiple log-periodic oscillators (4) which are located on a dielectric substrate (1), wherein the horn antenna body (3) consists of a first metal plane (7), a second metal plane (8) and two rows of metalized via hole horn side walls (9). The horn antenna body (3) is provided with metalized via hole arrays (11) and dielectric-loaded waveguides (14), and the dielectric-loaded waveguides (14) on the caliber face (10) of the horn antenna body (3) are identical in width and respectively connected with one of the log-periodic oscillators (4). Electromagnetic waves can reach to the log-periodic oscillators in a constant-amplitude mode and then are radiated, and the polarization direction of a radiation field is parallel to the substrate. The thin-substrate amplitude correction broadband planar horn antenna can be manufactured by using the thin substrate and is wide in frequency band, high in gain, low in cost and compact in structure.

The invention discloses a millimeter wave array antenna with high gain and low sidelobe level characteristics. The millimeter wave array antenna comprises a GCPW feed structure, a one-to-four power divider and a quaternary slot leaky-wave antenna array based on a SIW resonant cavity TE440 mode, a lower metal surface and a metal ground cover the upper surface and the lower surface along the length direction of the lower-layer dielectric plate respectively; four groups of periodically arranged coupling slot pairs and a GCPW feed structure are etched on the lower metal surface; the one-to-four power dividers are symmetrically arranged on the lower-layer dielectric plate, and a group of metalized through holes are uniformly etched along the periphery of the upper-layer dielectric plate; the four-element slot leaky-wave antenna array based on the SIW resonant cavity TE440 mode is located on the upper dielectric plate, and four groups of periodically arranged metalized through hole arrays are etched on the upper dielectric plate. According to the invention, the effective excitation of the planar antenna is realized by adopting GCPW side feeding, the feeding form is simple, the high gain characteristic with ultra-low sidelobe level is realized, and the antenna has potential application value in 5G mobile communication, satellite communication, millimeter wave communication and other systems in the future.