63 results about "Microstrip feed line" patented technology

The application discloses a balanced filter with adjustable attenuation, which realizes the function of adjustable attenuation of the balanced filter, reduces the device size on the basis of not affecting the performance, improves the integration of the device, and has the advantages of simple structure, high economy and high practicability. The balanced filter comprises a dielectric substrate and a graphene nanometer plate. The upper surface of the dielectric substrate is symmetrically provided with microstrip feed line structures on both sides, and the microstrip feed line structures are provided with a microstrip resonance structure. One side of the microstrip resonance structure close to the central axis of the dielectric substrate is connected to one side of the graphene nanometer plate, and the other side of the graphene nanometer plate is connected to a metal sheet. The lower surface of the dielectric substrate is provided with a metal ground plate.

The embodiment of the application provides a magneto-electric monopole antenna unit, a magneto-electric monopole antenna array, an antenna and equipment, and belongs to the technical field of wireless communication. The antenna unit comprises a first dielectric substrate, a monopole radiator, a microstrip feed line, a metal reflector plate, a short-circuit metal column and two ground patches. It generates an electric monopole mode through the monopole radiator excitation, and generates a magnetic monopole mode through the short-circuit metal column, the ground patch and the reflector plate, and the two modes work together to realize wideband radiation and widen the beam width. The coupled currents on the two ground patches produce two pairs of opposite electric field components in the far field and offset each other, thereby realizing low cross polarization. The array composed of multiple units is loaded with a metasurface above, which significantly improves the port isolation by introducing a reflection path opposite in phase to the original coupling path. The application solves the technical problem that it is difficult to simultaneously realize wide-angle scanning, low cross polarization and high isolation in a wide frequency band.

The invention discloses a broadband miniaturized metasurface antenna based on a double-layer planar spiral structure, which comprises a multi-layer stacked structure and specifically comprises four layers of metal structures and three layers of dielectric substrate structures, the four layers of metal structures are respectively a first metasurface layer, a second metasurface layer, a metal ground layer with a coupling gap and a micro-strip feeder line layer; the three layers of dielectric substrates are respectively an upper layer dielectric substrate, a middle layer dielectric substrate and a lower layer dielectric substrate, the dielectric substrates are arranged from top to bottom, and the four layers of metal structures are respectively attached to the surfaces of the corresponding dielectric substrates; a penetrating metal through hole is formed in the upper dielectric substrate and is used for realizing electrical interconnection between the first super-surface layer and the second super-surface layer; the first metasurface layer and the second metasurface layer are both composed of a plurality of nested planar spiral metal patches which are periodically arranged. The overall size of the metasurface antenna can be remarkably reduced, and meanwhile broadband work, high gain and stable edge emission radiation performance are achieved.

This invention discloses a miniaturized filtered circularly polarized microstrip patch antenna, comprising: an upper dielectric substrate and a lower dielectric substrate; a main radiating patch is printed in the middle region of the upper surface of the upper dielectric substrate; a first rectangular slot is provided on the main radiating patch; unequal-length cross-shaped patches and longitudinal rectangular parasitic patches are printed on the lower surface of the upper dielectric substrate; a short-circuit parasitic patch and a longitudinal grounded microstrip feed line are printed on the upper surface of the lower dielectric substrate; a ground plane is printed on the lower surface of the lower dielectric substrate; a second rectangular slot is formed at the upper left corner of the main radiating patch, and a protruding rectangular protrusion is provided at the upper right corner of the main radiating patch. This invention utilizes the advantages of the patch antenna's low profile and small size to achieve miniaturization, can generate three circularly polarized radiation frequencies to achieve broadband circular polarization performance, and can generate two radiation nulls to achieve bandpass filtering response.

The invention belongs to the field of superconducting receiving, and provides an HTS filter based on a full-wavelength resonator in order to improve the power capacity of the HTS filter, the HTS filter comprises a dielectric substrate, an HTS film is deposited on the first surface of the dielectric substrate, and a grounding metal layer is arranged on the second surface opposite to the first surface; the microstrip resonant structure is formed on the HTS thin film of the dielectric substrate and comprises at least two full-wavelength resonators, the adjacent full-wavelength resonators realize electromagnetic coupling through a gap, and the equivalent electrical length of each full-wavelength resonator is a waveguide wavelength corresponding to the working center frequency of the HTS filter; and the input port and the output port are respectively coupled with the full-wavelength resonator on the outermost side in the micro-strip resonant structure through micro-strip feeder lines. According to the technical scheme, the full-wavelength resonator structure with the equivalent electrical length as the waveguide length is adopted, so that the radio-frequency current can be redistributed along a longer resonance path, and the power capacity of the HTS filter is improved on the premise that the device size and the manufacturing complexity are not remarkably increased.

The invention belongs to the technical field of microwaves, and particularly relates to a slot line-half-mode SIW composite transmission line for microwave / millimeter wave transmission, which is characterized in that a half-mode SIW structure is arranged in a sandwich structure, and a first metal layer synchronously loads a conical microstrip feeder line and a horn-shaped microstrip feeder line structure; the second metal layer is used as a metal structure with a floor function, and the design mode of additionally loading a slot line and an interdigital capacitor enables the device to realize transmission of an S wave band and a Ka wave band at the same time. Wherein in the S wave band, the horn-shaped micro-strip structure of the first metal layer is used for carrying out coupled feeding on the slot line, and in the Ka wave band, the conical micro-strip structure of the first metal layer is used for directly feeding the half-mode SIW; meanwhile, the second metal layer loads an interdigital capacitor at the tail end of the half-mode SIW to complete filtering, and finally the composite transmission line feed structure supporting synchronous transmission of the half-mode SIW and the slot line is constructed. The machining process is simplified, and the machining cost is reduced.

The invention provides an ultra-wideband transparent antenna, which relates to the technical field of antennas and comprises an antenna radiation patch, a floor and a dielectric substrate, the floor is located on the first end face of the dielectric substrate; the antenna radiation patch is arranged on the second end surface of the dielectric substrate; the dielectric substrate is made of soda-lime glass; the antenna radiation patch comprises a first rectangular unit, a second rectangular unit, a third rectangular unit, a first field-shaped unit, a second field-shaped unit, a first triangular unit and a second triangular unit; the first rectangular unit is connected with the microstrip feeder; a plurality of rectangular grooves are formed in the first rectangular unit; according to the invention, the cooperation of high light transmission, ultra wide band coverage, stability and reliability is realized.

The application discloses a compact four-mode four-port antenna, and belongs to the antenna field. The compact four-mode four-port antenna comprises a first dielectric substrate, a second dielectric substrate, a metal ground plate and a third dielectric substrate which are sequentially stacked, the upper surface of the first dielectric substrate is provided with a segmented annular metal patch, the upper surface of the second dielectric substrate is provided with a circular metal patch, and the lower surface of the third dielectric substrate is provided with a microstrip feed line and a solder pad. The four-mode four-port antenna further comprises a first metal column, a second metal column and a third metal column, the segmented annular metal patch is electrically connected with the microstrip feed line through the first metal column, the circular metal patch is electrically connected with the microstrip feed line through the second metal column, and the solder pad is electrically connected with the metal ground plate through the third metal column. The circular metal patch is used for realizing three polarized radiation modes, and the segmented annular metal patch is used for realizing a fourth polarized radiation mode, so that the manufacturing demand of miniaturization and integration of communication equipment can be met.

The invention discloses a dielectric mutual-decoupling antenna based on a strip dielectric resonator, and belongs to the technical field of microwave communication. The invention provides a low-profile decoupling antenna scheme without additional components to solve the problems that mutual coupling of an existing closely-arranged dielectric antenna array is deteriorated, and an additional structure needs to be additionally arranged in a traditional decoupling mode, so that an antenna is complex or the profile is increased. The antenna is of a laminated structure and comprises a top-layer double-radiation dielectric patch, a middle strip-shaped dielectric resonator, a slotted metal ground and a centrosymmetric L-shaped microstrip feeder. During working, the top layer excites a half-wavelength electric field, the middle resonator excites a full-wavelength electric field, a weak field region is formed by equal-amplitude and reverse-phase offset, and the feed slot is arranged in the weak field region to realize port decoupling.

The invention provides a broadband millimeter wave packaging antenna. The broadband millimeter wave packaging antenna comprises a feed coupling structure and a radiation structure, the radiation structure comprises a first dielectric layer, a second dielectric layer and a third dielectric layer, the first dielectric layer is provided with a parasitic radiation patch, the parasitic radiation patch comprises a dipole patch and a plurality of parasitic patches, and the plurality of parasitic patches are mutually coupled through microstrip connecting lines; a main radiation patch is arranged between the first dielectric layer and the second dielectric layer, and the main radiation patch is electromagnetically coupled with the parasitic radiation patch through the first dielectric layer; the feed coupling structure comprises a common grounding layer, at least one dielectric layer and a bottom metal layer, a coupling gap is etched in the common grounding layer, a microstrip feeder line is arranged on the bottom metal layer, and the microstrip feeder line performs electromagnetic coupling feed on the radiation structure through the coupling gap. The miniaturized and ultrathin design of the antenna is realized, the antenna is adaptive to a high-density packaging scene, and broadband, high gain and high integration level can be realized at the same time in a limited area.

This invention discloses a single- and dual-band reconfigurable microstrip quasi-Yagi antenna. The antenna includes a dielectric substrate, a coplanar radiating patch, a first director, a second director, a microstrip feed line, and four radio frequency (RF) PIN diodes. The coplanar radiating patch is printed on the front side of the dielectric substrate. RF PIN diodes are respectively disposed between the first and second directors, the main radiating patch of the coplanar radiating patch, and the four parasitic radiating patches. The microstrip feed line is printed on the back side of the dielectric substrate. By reasonably setting the conduction and cutoff of the four PIN diodes, this invention can operate in the n78 or n79 frequency band, or simultaneously operate in both the n78 and n79 frequency bands as a dual-band antenna. This antenna achieves good directional radiation in all operating frequency bands, with stable radiation performance. It is a novel, small-sized, lightweight, low-profile, and small-scattering-cross-section directional antenna.

The application discloses a heart-shaped broadband circularly polarized patch antenna, which comprises a dielectric substrate, a heart-shaped radiation patch, a microstrip feed line and a ground plate. A characteristic mode analysis method suitable for irregular geometric shapes is proposed, that is, a plurality of non-orthogonal characteristic modes are used to realize a broadband circularly polarized antenna. The application has the advantages of simple structure, beauty, compactness, simple feed mode, wide impedance and axial ratio bandwidth, and stable radiation pattern. The new method has clear physical mechanism, simple steps and wide application prospect.

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

This invention discloses an absorptive microstrip slotted antenna and its filtering and absorption method. The microstrip slotted antenna includes a microstrip feed line, a slotted ground plane, a bandpass filter absorption circuit, and a dielectric substrate. The microstrip feed line is mounted on the upper surface of the dielectric substrate, and the slotted ground plane is mounted on the lower surface of the dielectric substrate. The bandpass filter absorption circuit is disposed on the microstrip feed line and includes a resistor and a resonant circuit connected in parallel. The resonant circuit includes a capacitor and an inductor connected in series. It also includes a feed connector connected to the microstrip feed line. This application achieves anti-reflection performance by using a microstrip line structure to excite the slotted line and connecting a bandpass filter absorption circuit in series at the optimal loading position of the microstrip feed line. This invention has a wide anti-reflection bandwidth, extremely high structural integration, and good antenna radiation performance, making it well-suited for application in the field of wireless communication systems.

The utility model relates to a miniaturized transmit-receive common microstrip antenna unit, which comprises a first dielectric substrate, a second dielectric substrate and metalized via holes, the first dielectric substrate is located above the second dielectric substrate; a radiation metal patch is arranged above the first dielectric substrate, and a grounding metal patch is arranged between the first dielectric substrate and the second dielectric substrate; the upper end of the metalized via hole sequentially penetrates through the second dielectric substrate, the grounding metal patch and the first dielectric substrate and then is connected with the radiation metal patch, and the lower end of the metalized via hole is connected with the microstrip feeder; according to the miniaturized transmit-receive sharing microstrip antenna unit provided by the utility model, the cost is further reduced through two modes of transmit-receive sharing and radiation metal patch hollowing-out, and miniaturization and integration are realized at the same time.

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

The application discloses a magnetic resonance near-field super-resolution sensing unit with high-order harmonic suppression, comprising a first layer metal patch, a first dielectric substrate arranged in close connection with the first layer metal patch, a second layer metal ground arranged in close connection with the first dielectric substrate, a second dielectric substrate arranged in close connection with the second layer metal ground, and a third layer metal patch arranged in close connection with the second dielectric substrate; the first layer metal patch comprises a first sensing horizontal arm and a second sensing horizontal arm, wherein the first sensing horizontal arm and the second sensing horizontal arm are arranged in parallel and spaced apart, and a subwavelength slit is formed between the first sensing horizontal arm and the second sensing horizontal arm; the third layer metal patch comprises a microstrip feed line and a resonance structure, and the third layer metal patch is a symmetrical structure. According to the application, a good dynamic range and low loss are achieved, and the symmetrical structure can effectively suppress the influence of high-order harmonics and realize wide-spectrum operation.

The application discloses a dual-frequency dual-port directional diagram reconfigurable antenna loaded with a parasitic structure and relates to the technical field of reconfigurable antennas. The antenna comprises a dielectric substrate, two pairs of printed dipole antennas, a feed network and a parasitic structure. The two pairs of printed dipole antennas are orthogonally arranged on the dielectric substrate and are respectively connected to a feed port one and a feed port two. The feed network comprises a central microstrip feed line and a parallel metal strip line. The parasitic structure is composed of a mixed array of square metal units and isosceles right triangle metal units. Each unit is arranged at equal intervals, the array is symmetrically arranged relative to the printed dipole, and a predetermined coupling interval is maintained between the array and the printed dipole. The application uses two pairs of orthogonally arranged printed dipole antennas for dual-port feeding, realizes azimuth angle plane beam switching, and is flexible in function realization.

This invention discloses a multi-band microstrip patch antenna, relating to the field of antenna technology. The multi-band microstrip patch antenna includes a rectangular patch antenna, a dielectric substrate, an air layer, a metal ground plane, and a coaxial feed line. The rectangular patch antenna is located on one side of the dielectric substrate, the metal ground plane is located on the other side, and the air layer is located between the dielectric substrate and the metal ground plane. The rectangular patch antenna includes multiple concentric rings, curved fractals, a curved flow, and a microstrip feed line. Curved fractals are applied to the outer ring of each concentric ring, and a magnetic cuboid is located on the rectangular patch antenna. Signals enter the multiple concentric rings and curved flow with curved fractals on the microstrip patch antenna via the coaxial feed line. Compared to existing antennas, the above-described multi-band microstrip patch antenna can achieve multi-band electromagnetic wave transmission and reception in the low-frequency band, and it has a simple structure, multiple functions, is easy to manufacture, and has low manufacturing costs.

This invention discloses a method for implementing a wideband, high-gain, dynamically tuned antenna using a reusable PCB mounting screw, comprising a screw and a PCB. The screw is a self-tapping or non-self-tapping screw made of conductive material. The PCB has screw holes, the walls of which are metallized by electroplating to form a metallization layer. A microstrip feed line is provided on the PCB, extending to the vicinity of the screw holes. Several dielectric filling slots are circumferentially arranged on the metallization layer along the hole walls. The dielectric filling slots extend axially along the screw holes and form discontinuous metallization sections on the hole wall surface. Each dielectric filling slot is filled with a dielectric material with an adjustable dielectric constant. The microstrip feed line includes a main feed line segment and an auxiliary feed line segment. The end of the main feed line segment is connected to the metallization layer of the screw holes through direct contact or electromagnetic coupling. The auxiliary feed line segment is arranged around the screw holes and forms a preset phase difference with the main feed line segment.

This invention discloses a wide-beam millimeter-wave circularly polarized magnetoelectric dipole antenna, comprising a first dielectric substrate, a metal layer, and a second dielectric substrate stacked together. Two rotationally symmetrical L-shaped patches are disposed on the first dielectric substrate. A split ring is disposed around the periphery of the two L-shaped patches, and several slits are uniformly cut along the circumferential direction of the split ring. A section of the metal layer is cut out in the middle to form a coupling slit. A microstrip feed line is disposed within the second dielectric substrate. The two L-shaped patches are connected to the metal layer through a first metallized via. A second metallized via is disposed at each slit of the split ring, passing through the first dielectric substrate and contacting the metal layer. A third metallized via is disposed in the gap between the L-shaped opening of the two L-shaped patches and the split ring, passing through the first dielectric substrate and contacting the metal layer. The advantages of this invention are: a 3-dB axial ratio beamwidth and a half-power beamwidth, thereby achieving communication over a wide angle range.

The application discloses a compact four-mode four-port antenna, and belongs to the antenna field. The compact four-mode four-port antenna comprises a first dielectric substrate, a second dielectric substrate, a metal ground plate and a third dielectric substrate which are sequentially stacked, the upper surface of the first dielectric substrate is provided with a segmented annular metal patch, the upper surface of the second dielectric substrate is provided with a circular metal patch, and the lower surface of the third dielectric substrate is provided with a microstrip feed line and a solder pad. The four-mode four-port antenna further comprises a first metal column, a second metal column and a third metal column, the segmented annular metal patch is electrically connected with the microstrip feed line through the first metal column, the circular metal patch is electrically connected with the microstrip feed line through the second metal column, and the solder pad is electrically connected with the metal ground plate through the third metal column. The circular metal patch is used for realizing three polarized radiation modes, and the segmented annular metal patch is used for realizing a fourth polarized radiation mode, so that the manufacturing demand of miniaturization and integration of communication equipment can be met.

The application provides a dual-frequency navigation glass antenna and a communication system, which comprises a composite glass substrate, a ground plane provided with a transmission channel, a microstrip feed line corresponding to the transmission channel, and a radiation mechanism with an included angle between the length direction and the first direction within a preset range, the radiation mechanism comprising two low-frequency patches and two high-frequency patches, the high-frequency patches and the low-frequency patches being staggered and arranged in a center-symmetrical structure, the low-frequency patches being provided with parallel grooves and orthogonal grooves arranged perpendicularly to each other, and the extension direction of the adjusting grooves being parallel to the extension direction of the orthogonal grooves. The application solves the defects of narrow bandwidth, large gain fluctuation and weak signal reception in part of the frequency band of the traditional navigation antenna, and realizes the synergistic optimization of the dual-frequency performance, the integrated reliability and the signal reception quality.

The invention discloses a post porcelain insulator detection radio frequency wave probe and a crack detection method, and the post porcelain insulator detection radio frequency wave probe comprises four stacked circular monopole antenna units; each stacked circular monopole antenna unit comprises two circular radiation sheets with different radiuses, namely a small circular radiation sheet and a large circular radiation sheet; the large circular radiation sheet is connected with the small circular radiation sheet, the small circular radiation sheet is connected with the microstrip feeder, and the microstrip feeder is used for feeding the circular radiation sheets; the large circular radiation sheets of the four stacked circular monopole antenna units face the center and are arranged on the top surface of the substrate at equal intervals. The bottom surface of the substrate is provided with the grounding plate. The probe for detecting the radio frequency waves of the pillar porcelain insulator is suitable for nondestructive detection of the radio frequency waves in the frequency band of 5-10 GHz. The crack detection method provided by the invention can accurately identify the internal crack defect of the pillar porcelain insulator.

The application relates to a three-dimensional gradient slot antenna, which comprises a base with an opening in the middle, a three-dimensional gradient slot array arranged along the opening and located on the top of the base, and a feeding structure fixedly installed at the bottom of the base and comprising a first conductor layer, a dielectric layer and a second conductor layer, wherein the dielectric layer is located between the first conductor layer and the second conductor layer, the first conductor layer is etched with a slot array matched with the three-dimensional gradient slot array, the dielectric layer is provided with a metallized via array and forms a terminal short-circuit substrate integrated waveguide with the first conductor layer and the second conductor layer, and the end of the second conductor layer is provided with a microstrip feed line to realize switching of the substrate integrated waveguide. The three-dimensional gradient slot structure is adopted for radiation, the terminal short-circuit substrate integrated waveguide on the first conductor layer is adopted for feeding, the frequency scanning function and the lateral radiation are realized at the same time, energy loss caused by a double-port transmission mode is avoided, and the antenna radiation efficiency is improved.

The invention discloses a directional diagram reconfigurable antenna based on liquid metal, and relates to the technical field of wireless communication and antennas. The antenna comprises a dielectric substrate lower layer printed with a microstrip feeder line, a dielectric substrate, a dielectric substrate upper layer printed with a slotted floor, and a PDMS plate loaded with a liquid metal flow channel, which are stacked from bottom to top. Wherein the micro-strip feeder line is matched with a square slot in the slotted floor to form a slot coupling feed structure serving as a main radiation source; a plurality of L-shaped runners which are symmetrically distributed around the center are arranged in the PDMS plate and are used for accommodating liquid metal (such as gallium-indium-tin alloy). By controlling the filling state of the liquid metal in the runners at different positions, the liquid metal serves as a parasitic element to be coupled with the main radiation slot, the current distribution and boundary conditions of an antenna near field are changed, and therefore flexible reconstruction of an antenna radiation pattern is achieved. The invention has the advantages of compact structure, low profile, low cost, easy integration and the like, and is suitable for the requirements of a modern communication system on beam forming.

The invention belongs to the field of wireless communication, and particularly relates to a differential high-selectivity antenna with a broadband anti-interference characteristic, which comprises an upper-layer metal radiating surface, an upper-layer dielectric substrate, a middle-layer metal radiating surface, a middle-layer dielectric substrate, a metal floor, a bottom-layer dielectric substrate, a metal micro-strip feeder line layer and an SMA feeder. The metal micro-strip feeder line layer is composed of two pairs of differential micro-strip feeder lines, and each micro-strip feeder line comprises a first rectangular micro-strip feeder line, a second rectangular micro-strip feeder line and a U-shaped micro-strip feeder line. And an L-shaped open-circuit branch loaded on one side of the second rectangular microstrip feeder and a concave groove part etched in the upper-layer metal radiating surface respectively form a radiation zero point at a high frequency and a low frequency in a differential feed mode, so that the high-selectivity characteristic of the antenna is realized. A first rectangular open-circuit branch knot and a second rectangular open-circuit branch knot are loaded on the other side of the second rectangular microstrip feeder line so as to restrain additional interference generated by loading a structure meeting the high-selectivity characteristic of the antenna, and therefore the broadband anti-interference characteristic is achieved.

The invention, which belongs to the technical field of wireless energy transmission, relates to a planar ultra-wideband tightly-coupled dual-polarized phased-array antenna for low-altitude communication, comprising a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a fourth dielectric substrate, a fifth dielectric substrate, a sixth dielectric substrate, a short circuit column, a feed column and an open circuit column which are arranged from bottom to top. A metal floor is arranged on the lower surface of the first dielectric substrate; a metal circular ring is arranged on the lower surface of the third dielectric substrate, and a dipole patch and a microstrip feeder are arranged on the upper surface of the third dielectric substrate; a metal cross strip is arranged on the upper surface of the fourth dielectric substrate; the upper surface of the sixth dielectric substrate is provided with an upper-layer metasurface, and the lower surface is provided with a lower-layer metasurface; the short circuit column penetrates through the first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the dipole patch; the feed column penetrates through the first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the microstrip feed line; the open circuit column penetrates through the second dielectric substrate, the third dielectric substrate and the microstrip feeder line.

This invention discloses a broadband millimeter-wave circularly polarized antenna element, a single-mode array, and a dual-mode array, relating to the field of circularly polarized antenna technology. The antenna element has a microstrip feed line on the lower surface of its second dielectric substrate; coupling gaps are etched on the metal ground layer; two metallized vias are formed on the first dielectric substrate; a metal strip is laid flat on the upper surface of the first dielectric substrate; two L-shaped parasitic patches are also laid flat on the first dielectric substrate; the two L-shaped parasitic patches are located on both sides of the metal strip, and are rotationally symmetrical about the center point of the upper surface of the first dielectric substrate. This invention utilizes the L-shaped parasitic patches to improve the 3-dB axial ratio bandwidth of the antenna element.

The invention discloses a double-frequency directional PCB (printed circuit board) antenna, and relates to the technical field of wireless communication, in particular to a double-frequency directional PCB antenna, which is characterized in that a pair of planar inverted-F antennas are symmetrically arranged on a printed circuit board with the size of 50mm * 35mm, and the planar inverted-F antennas work in a dipole mode and share a second grounding metal layer to realize directional radiation. Each antenna unit comprises a main radiation arm with the length of 22.5 mm and used for generating 2.4 GHz resonance; the tail end of the branch radiation arm is connected with the branch radiation arm which is 5.7 mm long and is used for generating 5GHz resonance; a short-circuit column with double through holes connected in parallel is connected with the grounding layer; electromagnetic coupling of the 50-ohm microstrip feeder line is realized through a coupling gap with the length of 15mm and the width of 0.25 mm on the grounding layer. The standing-wave ratios of the antenna in 2.4 GHz and 5GHz frequency bands are not greater than 2, the gains respectively reach 2-3dBi and 5-7dBi, and the antenna is suitable for an MIMO wireless communication system with the IEEE 802.11 b / g / n / ac / ax standard.