140 results about "Impedance bandwidth" patented technology

The invention provides a wide-angle scanning dual-circularly-polarized phased-array antenna unit, which belongs to the field of dual-circularly-polarized antennas and comprises a first dielectric layer, a second dielectric layer and a third dielectric layer which are sequentially stacked, the antenna radiator is arranged on the side, away from the second dielectric layer, of the first dielectric layer, the antenna radiator comprises four radiation patches, each radiation patch comprises a metal patch and a loading branch knot, and each metal patch is provided with a slotted structure; the first metal ground layer is clamped between the first dielectric layer and the second dielectric layer, and a cross coupling gap and a first coupling gap and a second coupling gap which are perpendicular to each other are formed in the first metal ground layer; the U-shaped feeder line is clamped between the second dielectric layer and the third dielectric layer, and two ends of the U-shaped feeder line are respectively connected with a coaxial feed column penetrating through the third dielectric layer; the second metal ground layer is arranged on the side, away from the second dielectric layer, of the third dielectric layer; an array is also provided; the problem that a traditional circularly polarized antenna is narrow in impedance bandwidth and limited in polarization is solved.

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 Ka-band four-tilt-beam magnetoelectric dipole antenna, and belongs to the technical field of millimeter wave radio frequency front-end devices. Based on a magnetoelectric dipole composite radiation structure, four centrosymmetric radiation units are integrated on a low-loss substrate. The antenna comprises a probe patch of a coaxial gamma-shaped feed probe, a radiation patch, a parasitic patch, an upper dielectric substrate, a lower dielectric substrate, a middle curing layer, a shorter metal through hole of the coaxial gamma-shaped feed probe, a longer metal through hole of the coaxial gamma-shaped feed probe, a metal through hole c of the radiation patch, a metal through hole d of the parasitic patch and a metal ground backboard, a probe patch, a radiation patch and a parasitic patch of the coaxial gamma-shaped feed probe are located on the upper surface of the upper-layer dielectric substrate, and a metal ground backboard is located on the lower surface of the lower-layer dielectric substrate; the antenna has ultra-wide impedance bandwidth, has the characteristics of low cost, miniaturization, low cross polarization and back lobe suppression, and is superior to a traditional inclined beam antenna and an antenna array scheme.

The invention discloses a low-profile and high-integration broadband dual-circularly-polarized transceiving common-aperture phased-array antenna, which adopts a multi-layer PCB (Printed Circuit Board) laminated structure, comprises a radiation patch layer, a quasi-rectangular patch layer, a metal reflection ground layer and a feed layer from top to bottom, and is combined with a metalized blind hole and a buried hole to form a complete coupling path. A U-shaped groove, a U-shaped metal strip and a C-shaped groove are integrated on a metal reflection ground, and a staggered groove is loaded on a quasi-rectangular patch, so that a K / Ka dual-band separated dual-coupled feed structure is realized, and dual circularly polarized radiation is obtained under the same aperture. The antenna is further provided with outer ring and inner ring plated-through hole arrays, the outer ring plated-through hole arrays are used for constructing an isolation area to improve the isolation degree between wavebands, and the inner ring plated-through hole arrays introduce a horizontal electric field component to improve the circular polarization purity and expand the axial ratio bandwidth. Wide impedance bandwidth and wide axial ratio bandwidth are realized in the K wave band and the Ka wave band, the isolation degree is high, the profile is low, the structure is compact, and the broadband phased array antenna is suitable for broadband phased array systems such as satellite communication terminals and mobile platforms.

The present application provides an antenna system and an electronic device. The antenna system includes a first antenna and a metal part. The metal part surrounds the first antenna, and a dielectric is filled between the metal part and the first antenna. The distance between the center line of the metal part and the first antenna is r, where 0.2×n×λ1 < r < 0.8×n×λ1, λ1 is the wavelength of electromagnetic waves propagating in the dielectric, n is a natural number, and 1 ≤ n ≤ 5. The height of the metal part is h, where 0.25λ2 < h < λ2, λ2 is the wavelength of electromagnetic waves propagating in the metal part. By making the distance between the center line of the metal part and the first antenna satisfy the above distance relationship and the height of the metal part satisfy the above height range, the first antenna can self-excite the first resonance mode, and the first antenna can also excite the second resonance mode on the metal part. The metal part does not block the electromagnetic waves radiated by the first antenna, and can also excite new resonance modes on the metal part, thereby significantly broadening both the impedance bandwidth and the efficiency bandwidth.

The invention discloses a broadband dual-circularly-polarized low-cost phased-array antenna array element, which comprises an antenna radiation structure and a slot feed structure which are arranged independently from each other, and is characterized in that the antenna radiation structure comprises a parasitic radiation layer, a first dielectric substrate, an excitation radiation layer and a second dielectric substrate which are arranged in a laminated manner; the slot feed structure comprises a slot layer, a third dielectric substrate, a strip-shaped transmission line and a fourth dielectric substrate; the antenna layer structure and the slot feed structure realize electromagnetic coupling transmission through the slot layer; a hollow symmetrical structure is arranged in the middle of the first dielectric substrate, and the hollow part is used as an air medium to reduce dielectric loss; the gap layer is provided with a multidirectional coupling gap structure; the strip-shaped transmission line is provided with at least two feed ports, and dual circularly polarized radiation is formed in the antenna layer structure through excitation of different feed ports. The antenna radiation layer has no metal through hole or blind hole, can be processed in a layered manner, has the advantages of low processing cost and high yield, and ensures impedance bandwidth while realizing dual circular polarization.

The invention discloses a high-speed peripheral component interconnection bandwidth allocation system, method and device, a medium and a product, and relates to the technical field of computers. The system comprises an adapter card, an impedance circuit and a basic input and output system. The impedance circuit is integrated on the adapter card, when adapter cards of different specifications are inserted, output of different impedance signals can be achieved through the state change of the impedance circuit on the adapter card, and in the power-on self-test stage, the impedance signal output can be achieved. And the basic input and output system determines the bandwidth of each high-speed peripheral component interconnection channel according to the impedance value and a preset impedance bandwidth mapping table. Therefore, when the adapter card is replaced, operations such as circuit redesign and impedance matching element adjustment do not need to be carried out on the mainboard, and the universality of high-speed peripheral component interconnection bandwidth allocation is improved. Besides, the basic input and output system automatically obtains the impedance value and determines the bandwidth through the power-on self-test stage, firmware configuration parameters do not need to be modified manually, and the flexibility of server hardware configuration is enhanced.

The invention relates to a low-profile dual-polarization metasurface filtering antenna applied to Sub-6GHz, which comprises a first dielectric substrate, a metasurface is printed on the upper surface of the first dielectric substrate, a second dielectric substrate is downwards arranged on the upper surface of the first dielectric substrate, a metal floor is clamped between the first dielectric substrate and the second dielectric substrate, a first metalized through hole and a second metalized through hole are formed in the second dielectric substrate, and the first metalized through hole is communicated with the second metalized through hole. A first microstrip feeder line and a second microstrip feeder line are printed on the lower surface of the second dielectric substrate, and the first microstrip feeder line and the second microstrip feeder line intersect vertically. According to the invention, the metasurface structure is introduced, and by means of the metasurface structure, the antenna obtains a relatively wide impedance bandwidth 21.61% and a relatively high gain; under the condition that an extra filter circuit is not introduced, the low-frequency radiation zero point is introduced only by adding the n-shaped branch knot, and the radiation zero point frequency and out-of-band rejection can be adjusted by adjusting related parameters; according to the invention, while high isolation is realized, the cross polarization discrimination rate also exceeds 30dB; the antenna is simple in overall structure, low in manufacturing cost and easy to integrate.

The invention discloses a dual-port coaxial feed circular polarization magnetoelectric dipole antenna, and belongs to the technical field of millimeter wave satellite communication antennas. The antenna comprises a first metal patch layer, a dielectric substrate a, a second metal patch layer, a dielectric substrate b and a metal ground which are sequentially stacked from top to bottom, the second metal patch layer comprises four radiation patches which are arranged in a rectangular array, and each radiation patch is composed of a square patch and a circular ring patch at an inner corner; a metal through hole is formed in the dielectric substrate and is connected with the radiation patch and the metal ground, so that a magnetoelectric dipole radiation path is formed; the first metal patch layer is provided with a probe patch a, the center of the second metal patch layer is provided with a probe patch b, and the probe patch a and the probe patch b form two space orthogonal inverted L-shaped feed probes through a short column and a long column respectively; and the inner conductors of the two feed ports are respectively connected with the long columns of the two probes. The antenna has the advantages of wide impedance bandwidth, wide beam coverage, low profile and easy integration, and is suitable for a low-orbit satellite communication terminal.

The present invention provides a novel squiggly shaped taper for achieving an impedance matching for the larger bandwidth frequency ranging from 3 GHz to 20 GHz. The said squiggly shaped taper has size of 30×35 mm2 and comprises a circular metallic patch 102 with dielectric substrate 101 and Perfect Electrical Conductor 103 placed on one side and other side remains blank as a single sided PCB. all patch, ground, and tapered feed are comprised of 0.035 mm PEC, and the tapered feed comprises two feed widths inner feed P1 and another feed as P2 and the value of other feed varies with the value of S-parameter. The feed provides zig zag arrangement structure 105 where simultaneous increase and decrease of feed is achieved; the said dielectric substrate 101 is comprising of a FR 4 material exhibiting a dielectric constant of 4.4, thickness of 0.16 mm and loss tangent of 0.0024; further the said antenna provides an impedance bandwidth of 144% from 3.3 GHz to 20.3 GHz and a gain of 5.167 dBi at 14.9 GHz frequency and covers whole Ultra-wide band.

A dual-resonant antenna device is provided, exhibiting improved impedance bandwidth, cross-polarization, and isolation, and is less susceptible to spurious surface wave excitation. More specifically, at least one antenna element and a resonant structure are provided on a non-conductive substrate, such that at least one continuous conductive sidewall of the resonant structure surrounds the one or more antenna elements, forming a resonant cavity filled with a dielectric material covering the one or more antenna elements. Each antenna element is used to excite a TM mode, while the dielectric material and size of the resonant cavity are selected such that the resonant structure is used to excite a TE mode. In a preferred embodiment, the TM mode is a TM 01 mode, and the TE mode is a TE 111 mode.

The utility model discloses a dual-output high-precision vehicle-mounted GNSS (Global Navigation Satellite System) antenna, and relates to the technical field of positioning antennas. The receiving unit comprises a first microstrip patch, a second microstrip patch, an L1 antenna feed network, an L2 antenna feed network, an L1 prefilter, an L2 prefilter, an L1 pre-amplifier, an L2 pre-amplifier, an L1 filter, an L2 filter, a pilot frequency combiner circuit, a final amplifier, a splitter, a power switching circuit, a first switch, a second switch, a first connector and a second connector. The first microstrip patch is arranged above the second microstrip patch, and the L1 antenna feed network and the L2 antenna feed network are connected to the second microstrip patch. The device can realize miniaturization, expand the impedance bandwidth of the antenna, realize the reception of multi-constellation satellites and low-elevation satellites of the antenna, and meet the requirements of a high-precision inertial navigation module on the antenna.

This invention relates to a broadband high-gain radar antenna based on a metasurface and its applications, belonging to the field of antenna design. From top to bottom, it consists of a metasurface layer (Rogers RO3003C substrate + periodic ideal electrical conductor rectangular elements), an air cavity, a radiating layer (ideal electrical conductor patch with rectangular slots), a ground plane with rectangular slots, and a feed layer (microstrip line), operating near 12.4 GHz. The metasurface elements are optimized through characteristic mode analysis, the air cavity improves impedance matching, and the microstrip line is fed through the rectangular slots of the ground plane and the slots of the radiating layer. CST simulations show that the antenna has an impedance bandwidth of 1800 MHz in the 11.6–13.4 GHz range, a peak gain of 8.37 dBi, and a radiation efficiency of nearly 100%, making it suitable for millimeter-wave radar and providing new ideas for its miniaturization and high performance.

The application discloses a kind of millimeter wave broadband filtering antennas with wide-angle beam scanning function and array, from top to bottom include broadband radiator, metal ground layer and microstrip line feed layer in sequence, the broadband radiator includes first rectangular patch, second rectangular patch and driving patch;By controlling the size of first metal patch, second metal patch and driving patch, the resonant frequency of broadband radiator is regulated;By adjusting the distance between first rectangular patch, second rectangular patch and driving patch, and the spacing of adjacent first metal patch and adjacent second metal patch, the coupling amount of broadband radiator is regulated, and the bandwidth of broadband radiator is further regulated.The application has simple and compact structure, wide impedance bandwidth, and can cover four millimeter wave frequency bands.

This application discloses a wide-beam cavity antenna element and its phased array antenna. The cavity antenna element includes a first radiating patch, a first dielectric layer, a second radiating patch, an adhesive layer, a second dielectric layer, and a metal ground layer arranged sequentially. The first radiating patch has a first chamfer on each diagonal and a first U-shaped slot in its center. The second radiating patch has a second chamfer on each diagonal and a second U-shaped slot in its center. This application adopts a dual-radiating patch structure, with the first and second radiating patches located in different dielectric layers, effectively expanding the antenna bandwidth and improving radiation efficiency. The double-layer square microstrip patch design is compact and facilitates miniaturization and integration. The first radiating patch incorporates the first chamfer and the first U-shaped slot, while the second radiating patch incorporates the second chamfer and the second U-shaped slot, increasing the current path and transforming the original single resonant point into three resonant points within the frequency band, significantly widening the antenna's impedance bandwidth.

The application discloses a circularly polarized logarithmic-periodic antenna based on rotation of radiating oscillators, and belongs to the technical field of antenna engineering, and aims at solving the problem of how to design a circularly polarized logarithmic-periodic antenna with wide bandwidth, low profile and simple structure. The application forms corresponding circularly polarized characteristics by rotating a plurality of groups of radiating oscillators by a certain angle with parallel assembly lines as the shaft. The antenna only has a plurality of radiating oscillators which change according to the logarithmic-periodic antenna rule, and does not have a main oscillator and a sub-oscillator, so that the structure is simpler and easier to realize. Meanwhile, the circularly polarized effect is formed by rotating the radiating oscillators to a certain phase and the phase difference between the electromagnetic waves of each oscillator and the zero point of the antenna, so that the logarithmic-periodic antenna can obtain good impedance bandwidth and 3dB axial ratio bandwidth in the working frequency band.

The application discloses a kind of super surface circularly polarized antennas, belong to wireless communication technical field, including: super surface, super surface includes a plurality of first super surface units and a plurality of second super surface units arranged in array, first super surface unit is located in the periphery of second super surface unit, and second super surface unit is the symmetrical structure formed by cutting first super surface unit;Dielectric substrate, dielectric substrate includes upper layer dielectric substrate and lower layer dielectric substrate;Driving patch, driving patch is located between upper layer dielectric substrate and lower layer dielectric substrate;Metal floor, metal bottom plate is arranged on the lower surface of lower layer dielectric substrate;Microstrip feed structure, through coupling gap and driving patch non-contact coupling;By unit array optimization, phase difference is generated in orthogonal radiation mode, and circularly polarized radiation is realized.50 ohm microstrip line feeding is used, and non-contact coupling excitation is realized by coupling gap and driving patch;Synergistic design realizes 31.5% impedance bandwidth, 20.4% axial ratio bandwidth, and full coverage WBAN5.15-5.825GHz frequency band.

Wideband antenna elements exhibit strong coupling when formed into an array, which normally degrades the impedance bandwidth, radiation pattern, and efficiency of the feed antennas. Various methods are provided herein to mitigate or reduce this coupling. For example, designing an array such that not all antennas support the lower frequency operation mitigates coupling at low frequencies where coupling is most significant. Alternatively, embedding the feeds into a high-refractive-index medium increases the electrical distance between feeds while the physical separation is kept constant.

The application discloses a P-waveband broadband characteristic planar dipole antenna and belongs to the technical field of decimeter wave radio frequency front-end devices. A pair of printed planar dipoles composed of a half-elliptical part and a rectangular part and respectively located on the upper and lower surfaces of a dielectric substrate form the main radiation structure of the antenna. A metal base is composed of a metal side wall and a metal ground back plate, the metal side wall plays a role of supporting the dielectric substrate and also plays a role of a parasitic element, the current of the dipole is coupled to the parasitic element metal side wall, the current is avoided from being concentrated in the center of the dipole patch, and therefore the impedance bandwidth of the antenna is improved. The antenna has good radiation performance at 0.4 GHz, 0.5 GHz, 0.6 GHz, 0.7 GHz and 0.8 GHz, and the antenna can be widely applied to P-waveband wireless communication systems with requirements of broadband, low profile and stable performance.

The invention relates to a broadband high-gain radar antenna based on a metasurface and application, and belongs to the field of antenna design. The antenna comprises a metasurface layer (RogersRO3003C substrate and a periodic ideal electric conductor rectangular unit), an air cavity, a radiation layer (an ideal electric conductor patch with a rectangular slot), a grounding plane with a rectangular slot and a feed layer (microstrip line) from top to bottom in sequence, and works near 12.4 GHz. The metasurface unit is optimized through characteristic mode analysis, the air cavity improves impedance matching, and the microstrip line is coupled with the radiation layer gap for feeding through the grounding plane rectangular groove. CST simulation shows that the impedance bandwidth of the antenna is 1800 MHz at the frequency of 11.6-13.4 GHz, the peak gain is 8.37 dBi, the radiation efficiency is nearly 100%, the antenna can be used for millimeter wave radar, and a new thought is provided for miniaturization and high performance of the antenna.

This invention relates to the field of phased array antenna technology, specifically disclosing a low-profile broadband circularly polarized phased array antenna element, antenna array, and fabrication method. The antenna includes a body and interconnected feed layers disposed at the bottom of the body. The body comprises, from top to bottom, a parasitic patch, a first dielectric layer, a radiating patch, and a second dielectric layer. A metallized via, coaxial with the body and interconnected with the radiating patch, is disposed on the second dielectric layer. The feed layer is interconnected with the metallized via. A U-shaped slot is disposed on the radiating patch. The metallized via is located within the U-shaped region formed by the U-shaped slot. Compared with the traditional eccentric feeding method, this invention reduces the antenna profile height, lowers fabrication costs, broadens the impedance bandwidth and axial ratio bandwidth, and optimizes the antenna's axial ratio performance.

The invention provides a wide-beam high-gain microstrip antenna, and belongs to the technical field of wireless communication and antennas. Comprising a metal patch, a dielectric substrate and a metal parasitic patch, the metal patches are divided into a front part and a back part which are alternately placed on the front surface and the back surface of the dielectric substrate, namely, the metal patches with different widths are alternately arranged on the front surface and the back surface of the dielectric substrate, and the current distribution and impedance characteristics are adjusted through the gap structure to realize broadband matching and high-gain radiation; the metal parasitic patches are placed on the front face of the dielectric substrate and serve as a reflector and a director respectively, and a wide-beam directional radiation pattern is formed. The microstrip antenna provided by the invention can realize the characteristics of wide beam and high gain at the same time, can cover 2.12-2.78 GHz through the collaborative design of gap coupling and parasitic units, and realizes the impedance bandwidth exceeding 26%; the antenna can be expanded to any frequency band; a single-layer board integrated structure is adopted, excellent radiation performance is kept, and meanwhile, the antenna has the remarkable advantages of being low in profile, high in integration level and low in manufacturing cost.

The invention discloses a P-band broadband characteristic plane dipole antenna, and belongs to the technical field of decimetric wave radio frequency front-end devices. The main radiation structure of the antenna is formed by a pair of printing plane dipoles which are respectively arranged on the upper surface and the lower surface of the dielectric substrate and are formed by mixing semi-elliptical parts and rectangular parts. The metal base is jointly composed of a metal side wall and a metal ground backboard, the metal side wall plays a role in supporting the dielectric substrate and also plays a role in a parasitic element, current of the dipole is coupled to the metal side wall of the parasitic element, the current is prevented from being concentrated in the center of a dipole patch, and therefore the impedance bandwidth of the antenna is improved. The antenna has good radiation performance at 0.4 GHz, 0.5 GHz, 0.6 GHz, 0.7 GHz and 0.8 GHz, and the antenna can be widely applied to a P-band wireless communication system having requirements for broadband, low profile and stable performance.

This invention discloses a dual-substrate circularly polarized reconfigurable omnidirectional antenna based on PIN diode control. The antenna comprises a first substrate and a second substrate. The second substrate has a ground plane printed on it, and the first substrate has a radiating patch printed on it. The radiating patch includes a central square patch, a Γ-shaped stub, a loop antenna, PIN diodes, and via shorting posts. Seamless switching between left-hand and right-hand circular polarization is achieved through the on / off combinations of 16 PIN diodes, with a simple switching logic. High polarization purity is achieved in both polarization modes, and the via shorting posts effectively reduce mutual interference between modes, resulting in strong switching reliability. In both circular polarization modes, the relative impedance bandwidth and axial ratio bandwidth are wide. In the left-hand circular polarization mode, the relative impedance bandwidth reaches 19.38%, covering 2.33-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 26.3%, covering 2.08-2.71GHz with AR<3dB. In the right-hand circular polarization mode, the relative impedance bandwidth reaches 19.8%, covering 2.32-2.83GHz with |S11|<-10dB, and the axial ratio bandwidth reaches 23.43%, covering 2.11-2.67GHz with AR<3dB, which is significantly better than existing narrowband designs of the same type.

The invention provides a broadband wide-axial-ratio circularly polarized antenna based on a tight coupling principle, and relates to the technical field of microstrip antenna structure design, the broadband wide-axial-ratio circularly polarized antenna comprises a first dielectric plate as a substrate, and a feed network capable of realizing one-to-four power division and 90-degree phase shift is printed on the lower bottom surface of the first dielectric plate; a second dielectric plate is arranged above the first dielectric plate in parallel, four arc-shaped metal patches are arranged on the lower bottom surface of the second dielectric plate to form a radiation unit, and the adjacent patches are tightly coupled through an interdigital capacitor; and a strip-shaped microstrip line is arranged on the upper top surface of the second dielectric plate. And the four coaxial feeder lines are vertically connected with the output end of the feed network and each metal patch, so that high-efficiency transmission of signals is realized. The upper surface of the first dielectric plate is provided with an annular metal cavity which is connected with the metal ground and is used for improving the axial ratio at a low elevation angle. According to the invention, wide impedance bandwidth and wide axial ratio bandwidth are realized, and the antenna has wide axial ratio beam width and high radiation efficiency.

The invention discloses an inclined wave beam magnetoelectric dipole antenna of a Ku wave band, and belongs to the technical field of centimeter wave radio frequency front-end devices. The main radiation structure of the magnetoelectric dipole antenna adopts an arc dipole, and the arc dipole is divided into a first arc dipole and a second arc dipole; by optimizing parameters such as lengths and widths of the two pairs of arc dipoles, differentiated radiation current distribution of the antenna is respectively formed at a 12GHz frequency point and a 17GHz frequency point of a Ku wave band, so that two inclined wave beams in different directions are generated. The working frequency band of the antenna covers 9.74 GHz to 17.22 GHz, and the relative impedance bandwidth is about 55.5%. The antenna is simple in structure, is especially suitable for multi-band and multi-direction application scenes such as satellite communication, broadband radar, 5G / 6G return stroke and the like, and has remarkable technical competitiveness and industrialization value.

The present invention discloses a broadband circularly polarized filter patch antenna, comprising upper and lower dielectric substrates. The upper dielectric substrate is printed with a main radiating patch, a vertical rectangular parasitic patch, a horizontal rectangular parasitic patch, and an L-shaped patch. The main radiating patch is loaded with a rectangular slot. The vertical rectangular parasitic patch is placed along the y-direction of the upper dielectric substrate, the horizontal rectangular parasitic patch is placed along the x-direction, and the L-shaped patch is placed along the negative 45° diagonal of the main radiating patch. The lower dielectric substrate is printed with a floor and a microstrip feeder. A U-shaped slot is etched in the lower middle portion of the floor. Signals enter from a port, pass through the microstrip feeder, and are coupled to the main radiating patch through the U-shaped slot. The main radiating patch then couples and excites the surrounding parasitic patches. The broadband circularly polarized filter patch antenna provided by the present invention integrates circular polarization characteristics and bandpass filtering characteristics, achieving good impedance bandwidth and circular polarization bandwidth, and solving problems such as gain reduction and large size caused by the introduction of filtering circuits.

The invention provides a broadband wave-transparent base station antenna based on multi-technology mixing, relates to the technical field of microwave and millimeter wave communication, and solves the technical problems that most of staggered base station antenna design schemes in the prior art are relatively narrow in wave-transparent bandwidth, and broadband work is difficult to realize. According to the technical scheme, an L-shaped filtering branch knot is added to an annular dipole arm, and a narrow-band wave-transparent frequency point located near 2.6 GHz is introduced; on the basis, a 2 * 2 patch type frequency selective surface is introduced, and a second wave-transparent frequency point located at 2.18 GHz is introduced; a parasitic band is added, and a third wave-transparent frequency point located at 1.8 GHz is introduced; according to the broadband low-frequency antenna, the wave-transparent effect in the broadband band of 1.7 GHz to 2.7 GHz is achieved, meanwhile, the-15 dB broadband impedance bandwidth of the low-frequency antenna itself in the range of 690 MHz to 960 MHz is kept, and the three wave-transparent structures are mutually independent, do not interfere with one another and are convenient to regulate and control.

This invention discloses a circularly polarized scanning grating array based on a broadband 90° balun, belonging to the field of microwave antenna technology. The array consists of a grating array of circularly polarized antenna elements. Each circularly polarized antenna element includes, from top to bottom, a radiating patch layer, a first dielectric substrate, an air gap layer, a metal ground layer, a second dielectric substrate, and a feed network layer. This circularly polarized antenna element uses a rotated microstrip patch as the radiator and employs a metal back cavity to achieve stable unidirectional radiation. This structure effectively reduces coupling between elements after antenna array assembly. The lower-layer feed network uses a 180° power divider phase shifter combined with an ultra-wideband phase shifter, which can greatly achieve broadband phase shifting, thereby widening the impedance bandwidth and axial ratio bandwidth of the circularly polarized antenna.

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.