300results about How to "Improving Impedance Bandwidth" patented technology

The invention discloses a planar-broadband dual-polarization base station antenna and belongs to the field of mobile communication base station antennae. The planar-broadband dual-polarization base station antenna mainly solves the problems that an existing base station antenna is complex in structure and has difficulty in being integrated with other devices. The planar-broadband dual-polarization base station antenna comprises radiation oscillators (1), feed baluns (2), a baffle board (3), coaxial cables (4), supporting columns (5) and a dielectric material plate (6). The radiation oscillators (1) are dual-polarization planar oscillators at + / -45 degrees, and the feed baluns (2) are planar feed baluns at + / -45 degrees. The radiation oscillator at -45 degrees and the feed balun at +45 degrees are printed on the upper surface of the dielectric material plate (6), and the radiation oscillator at +45 degrees and the feed balun at -45 degrees are printed on the lower surface of the dielectric material plate (6). The dielectric material plate (6) is fixed to the square baffle board (3) through the supporting columns (5). According to the planar-broadband dual-polarization base station antenna, planarization of the radiation oscillators and the feed baluns are achieved, meanwhile, the structure of the baffle board is simplified, and a stable directional diagram characteristic can be obtained in broadband.

The invention discloses a double-rotating circularly polarized antenna which can meet with the using requirements of broadband miniaturization communication equipment, comprising an upper-layer radiation paster 1, a lower-layer radiation paster 2, a floor 3 with coupling gaps, a feed network 4, a dielectric substrate 5, a medium screw 6 and a base 7, wherein the upper-layer radiation paster 1 adopts medium coupled feeding; the lower-layer radiation paster 2 adopts floor 3 coupled feeding with the coupling gaps; the dielectric substrate 5 is used for supporting the gap between the upper-layer radiation paster 1 and the lower-layer radiation paster 2 as well as the gap between the lower-layer radiation paster 2 and the floor 3; and the feed network 4 is located below the floor 3 and adopts a strip line form. Double-tuning characteristic is formed by medium coupled feeding so as to further broaden the antenna impedance bandwidth and axial ratio bandwidth; and caliber utilization is improved in a limited space. Simultaneously, the bandwidth of the antenna is effectively broadened and the structural size of the antenna is reduced through H-shaped gap medium coupled feeding.

The invention provides an ultra-wideband antenna. The ultra-wideband antenna comprises a dielectric substrate, wherein a radiation unit, a feeding structure and a ground plane are printed on the dielectric substrate; the radiation unit is a forked chip; the feeding structure is a coplanar waveguide feeding structure; and the ground plane is a coplanar waveguide ground plane. The ultra-wideband antenna has a coplanar waveguide structure, so that a single planar printed antenna structure can be realized; the ultra-wideband antenna can be easily integrated with a microwave integrated circuit; the coplanar waveguide ground plane can serve as the ground plane of the whole antenna, and particularly for the coplanar waveguide structure with a wideband slot structure, wideband work can be realized, and the electromagnetic interference of outside on the antenna can be effectively avoided; and wideband impedance bandwidth can be easily realized, and the efficiency of the antenna is improved, so that higher antenna gain can be achieved.

The disclosed flat antenna is in use for solving issue that traditional antenna structure is unable to apply to broadband in high gain. The flat antenna includes following parts: microwave base plate with first surface and second surface; being collocated at the first surface, the first symmetrical type radiation element possesses a first radiation portion, and a second radiation portion; being collocated at the second surface, the second symmetrical type radiation element possesses a third radiation portion, and a fourth radiation portion; at least a connection unit in use for connecting the microwave base plate and reflecting plate. Design method of steps structure is adopted for tail ends of the first radiation portion, the second radiation portion, the third radiation portion, and the fourth radiation portion. The disclosed flat antenna can realize broadband in high gain.

An antenna module is provided. The antenna module includes a radiator, a feed pin, a ground element, a first parasitic arm, a second parasitic arm and an impedance matching unit. The radiator includes a first section and a second section, wherein an end of the first section is connected to the second section, and the first section is perpendicular to the second section. The feed pin is connected to another end of the first section. The first parasitic arm is parallel to the second section, wherein an end of first parasitic arm is connected to the ground element, and the first parasitic arm couples with the second section of the radiator. The impedance matching unit is connected to the second section and the ground element. The second parasitic arm is partially parallel to the first section, and the second parasitic arm couples with the first section of the radiator, and an end of the second parasitic arm is connected to the ground element.

The invention provides a miniaturized dual-frequency antenna. The miniaturized dual-frequency antenna comprises a medium substrate and a monopole antenna printed on the medium substrate. The monopole antenna comprises a main radiating unit, a coplanar waveguide feeding signal strip line connected with the main radiating unit, coplanar waveguide ground planes and auxiliary radiating units arrangedbetween the main radiating unit and the coplanar waveguide ground planes. The main radiating unit is a U-shaped radiating unit, the lower end of the coplanar waveguide feeding signal strip line is connected with an inner conductor of SMA (Stone Matrix Asphalt), and an outer conductor of the SMA is connected with the coplanar waveguide ground planes. The invention can be used for receiving and transmitting radio waves. The invention can be used for terminals for electronic reconnaissance and electronic countermeasure and tracking and electromagnetic protection, wireless local area network and global microwave access terminal receiving equipment. The invention has the advantages of simple structure, wide operating bandwidth and low cost, and is convenient for mass produce.

The invention relates to a small high-isolation double-notch UWB (Ultra-wide Bandwidth) MIMO (Multiple Input Multiple Output) antenna, which comprises a main floor board, a first floor board limb, a second floor board limb, a first metal strap, a second metal strap, a third metal strap, a first antenna unit, a second antenna unit, a first tail end opening gap and a second tail end opening gap, wherein the third metal strap is used for connecting the two floor board limbs. Due to the application of the two floor board limbs, a first excitation port and a second excitation port can be placed on the upper edge of a basal board, so that the impedance bandwidth of the antenna units can be effectively improved, and the isolation between the two antenna units is also effectively increased. The technical problem that the current UWB MIMO antenna cannot simultaneously realize small size, small cross coupling and wide bandwidth is solved. The first metal strap and the first antenna unit form a first annular loop, the second metal strap and the second antenna unit form a second annular loop, so that the high frequency notch is realized. Due to the application of the first tail end opening gap and the second tail end opening gap, the low frequency notch is realized. Therefore, the double-notch function is realized.

The invention discloses a double-frequency and double-polarization antenna capable of operating in a compass satellite navigation system and a mobile third-generation (3G) network and is implemented in a form of a laminated micro-strip circuit. The double-frequency and double-polarization antenna capable of operating in the compass satellite navigation system and the mobile 3G network comprises an upper-layer micro-strip antenna, a lower-layer micro-strip antenna and a metal floor layer, wherein the upper-layer micro-strip antenna has an upper-layer patch; the lower-layer micro-strip antenna has a lower-layer patch; the metal floor layer is arranged on a bottom layer; the upper-layer micro-strip antenna and the lower-layer micro-strip antenna share one metal floor layer; and the antenna is provided with six short-circuit metal columns which pass through the upper-layer micro-strip antenna and the lower-layer micro-strip antenna from the upper-layer patch and then are connected with the metal floor layer which is arranged on the bottom layer. The antenna adopts a feeding mode of dual-port coaxial feeding and has the advantages of simple and compact structure, miniaturization, convenience for processing and industrialized application, and the like.

The invention relates to a Ku-band circularly polarized dielectric resonator antenna which comprises a metal grounding plate and a micro-strip feeder line. The metal grounding plate is arranged on the upper surface of a dielectric substrate, and the feeder line is arranged on the lower surface of the dielectric substrate. A three-tier dielectric resonator is arranged at the center of the upper surface of the metal grounding plate; a crisscrossed gap is formed in the center of the metal grounding plate; the inner end of the micro-strip feeder line is arranged right below the crisscrossed gap and forms a 45-degree angle with the same; two cascade-connection dumbbell-shaped groove gaps are formed in the grounding plate. Impedance bandwidth of the antenna is 27.67%, circularly polarized axial ratio bandwidth 6.56%. within working frequency, the maximum gain of the antenna is 8.2dB, the minimum gain is 6.0dB, and the antenna has wider coverage range. Axial ratio of the 12.2GHz position is approximately 0.09dB, and the antenna has good circularly polarized characteristics. The antenna covers commonly used working frequency bands of satellite television broadcasting in IT3, and is applicable to a satellite television broadcasting system within 11-14.5GHz frequency bands.

The invention discloses a broadband low-section omni-directional circularly polarized antenna. A dielectric substrate of the broadband low-section omni-directional circularly polarized antenna comprises an upper-layer dielectric substrate and a lower-layer dielectric substrate, the upper-layer dielectric substrate and the lower-layer dielectric substrate are parallel to each other, and the upper-layer dielectric substrate is positioned right above the lower-layer dielectric substrate; a metal floor is adhere on the lower-layer dielectric substrate; a zero-order resonator, a parasitic radiator and a radiation type feeding network are adhered on the upper-layer dielectric substrate; the radiation type feeding network is positioned in the center of the upper-layer dielectric substrate; zero-order resonant patches of the zero-order resonator are annularly on the outer side of the radiation type feeding network, one end of each zero-order resonant dowel of the zero-order resonator is connected with the corresponding zero-order resonant patch, and the other end of each zero-order resonant dowel is connected with the metal floor; parasitic radiation patches are annularly arranged on the outer sides of the zero-order resonant patches, one end of each parasitic radiation dowel of the corresponding parasitic radiation patch is connected with the corresponding parasitic radiation patch, and the other end of each parasitic radiation dowel is suspended. The broadband low-section omni-directional circularly polarized antenna has the advantages that impedance of the broadband low-section omni-directional circularly polarized antenna and the bandwidths of directional diagrams can be increased, and excellent axial ratio characteristics can be kept.

A microstrip patch antenna includes a plurality of radially extending perturbations about the perimeter of the patch. The flow of electromagnetic current progressing along the perimeter of the patch is perturbed and results in an effective electromagnetic diameter substantially greater than the actual physical diameter of the patch.

A differential feed dual-polarized oscillator assembly comprises a radiator and a pair of balun support arms orthogonally connected to the radiator in a differential double-feed way. The radiator comprises two pairs of oscillator arms orthogonal to each other at 45 degrees and two orthogonal center of the two pairs of oscillator arms is provided with a cross-shaped short circuit plate. The front of each balun support arm is provided with a mirror-symmetrical microstrip balun along the center. The mirror symmetrical microstrip balun forms a group of differential double-feed lines. The back surface of each balun support arm is provided with a mirror-symmetrical grounding metal layer along the center. The oscillator arms and the short circuit plate are supported on the tops of the balun support arms. The oscillator arms are connected to the grounding metal layer. The short circuit plate is connected with the microstrip balun. Differentially doubly-feed is performed on the radiator so that the current distribution on the surface of the oscillator arms tends to be consistent. A directional diagram has good convergence, and high isolation, a high cross-polarization ratio and good impedance bandwidth are obtained. In addition, each pair of differential feed line terminal is subjected to short circuit and two polarized differential feed lines are subjected to crossed short circuit so that two polarization has a high degree of similarity.

An aperture-coupled antenna has a first radiation electrode, a ground area and a wave guide which is implemented to supply energy to the antenna. The wave guide is arranged spaced apart from the ground area on a first side of the ground area, and the first radiation electrode is arranged spaced apart from the ground area on a second side of the ground area. The ground area has an aperture including a first slot in the ground area, a second slot in the ground area and a third slot in the ground area. The first slot and the second slot together form a slot in the shape of a cross. The third slot passes through an intersection of the first slot and the second slot. The wave guide and the radiation electrode are arranged such that energy can be coupled from the wave guide through the aperture to the patch.

The invention relates to a high-gain G-shaped dual-frequency monopole antenna with a loaded dual-frequency AMC reflection plate, and belongs to the technical field of electromagnetism propagation and receiving. According to the micro-strip-line-feed G-shaped dual-frequency monopole antenna with the loaded dual-frequency AMC reflection plate, the dual-frequency AMC reflection plate is loaded under the G-shaped dual-frequency antenna. The antenna is characterized in that under the condition that the section of the antenna is kept low, the maximum gain of a 2.4-GHz frequency band and a 5.2-GHz frequency band in a WLAN system reaches 7.2dBi, and backward radiation of the 2.4-GHz frequency band and the 5.2-GHz frequency band in the WLAN system reduces by 14.1dB and 13.7dB respectively. The designed high-gain dual-frequency antenna with the loaded AMC reflection plate can be used for a 2.4-GHz system (2.4GHz-2.48GHz) and a 5.2-GHz system (5.15 GHz-5.35GHz) in the WLAN system, and provides guidance for a high-gain antenna working in a dual-frequency WLAN system.

The invention provides a wideband wide beam circular polarization medium resonator antenna suitable to X wave band, and belongs to the field of antennas. The antenna includes a medium substrate of which the right side is covered with a layer of metal surface mount device, a rectangular medium resonator which is arranged on the metal surface mount device, and an L-shaped feed microstrip antenna which is arranged on the back side of the medium substrate. The 4 corners of the bottom part of the rectangular medium resonator are dug out 4 same dimension rectangular medium blocks, and cross-slot-coupled the L-shaped microstrip antenna feed are adopted, so that the features of the wideband of the antenna area realized. The antenna is advantaged by wide frequency band, low profile, easiness to process, high stability of directional diagram within the working frequency band and wide wave beam width.

The invention relates to a three-frequency frequency reconfigurable antenna for coplanar waveguide feed, which comprises a metal microstrip on the upper layer, a dielectric substrate on the middle layer and a back floor board on the lower layer. The metal microstrip comprises a radiating patch, a coplanar waveguide floor board, a coplanar waveguide feeder, a matching branch and four PIN (P-Intrinsic-N) diodes, and the radiating patch is surrounded by the coplanar waveguide floor board. The coplanar waveguide floor board is connected with the radiating patch through the four PIN diodes, the coplanar waveguide feeder is arranged at a central opening on the lower edge of the coplanar waveguide floor board and is connected with the radiating patch into a whole, and the matching branch is connected with the upper part of the coplanar waveguide floor board into a whole. The back floor board is arranged on the back of the dielectric substrate and corresponds to metal coatings on the lower part of the coplanar waveguide floor board and under the coplanar waveguide feeder, and a microstrip antenna is formed by the back floor board and the metal microstrip. The three-frequency frequency reconfigurable antenna can work on three wireless communication frequency bands of 0.9GHz, 1.8GHz and 2.4GHz. Moreover, directional diagrams on the three frequency bands basically remain unchanged and have larger bandwidth. Meanwhile, the design of a switch bias circuit can be eliminated, and the impact of a switch on the radiation performance of the antenna can be reduced.

Disclosed is a planar inverted-F antenna with an extended grounding plane. The planar inverted-F antenna has a grounding metal plate having a selected side edge on which the extended grounding plane is formed and has a predetermined height. At least one antenna signal radiating plate is connected to the grounding metal plate by a short-circuit piece and is substantially parallel to and spaced from the grounding metal plate by a distance. A feeding point extends from the antenna signal radiating plate in a direction toward the grounding metal plate and corresponds to the extended grounding plane with a predetermined gap therebetween. With the arrangement of the extended grounding plane, the impedance matching of the antenna is improved and the impedance bandwidth of the antenna is increased.

The invention provides a double-frequency broadband E-shaped microstrip antenna, comprising an E-shaped patch 3. A main feeder line 1 is directly connected to an SMA joint 2 of coaxial feeding point of the E-shaped patch 3, the SMA joint passes through the ground and medium and then is directly in contact with the intermediate arm of the E-shaped patch 3, another two arms of the E-shaped patch 3 are symmetrically distributed at the two sides of the feeding point and have a distance of L3 from the edge of the intermediate arm, the E-shaped patch 3 is connected with a T-shaped patch (bent T-shaped patch) 4 by loading to form a main radiating unit of the antenna, a width t is arranged between the E-shaped patch 3 and T-shaped patch (bent T-shaped patch), and a slot with width t2 and depth t1 is respectively arranged at the two sides of the joint between the T-shaped patch (bent T-shaped patch) and the E-shaped patch. The invention has relatively high gain, wide working frequency band, uniform current distribution, light weight and small volume, can effectively improve communication quality, is easily integrated with a circuit, and can be widely used for a portable device and in indoor coverage and wireless local area network.

The invention discloses a high-isolation four-port diversity antenna for mobile communication, which comprises a dielectric substrate, a grounding plane, a feed network, four electromagnetic dipoles, four L-shaped ribbons, four aerial microstrip transmission lines and a vertical copper line, wherein the four electromagnetic dipoles are annularly and evenly arranged on the square grounding place at intervals; one L-shaped ribbon and one aerial microstrip transmission line are arranged in each electromagnetic dipole, and the L-shaped ribbons are connected with the feed network through the aerial microstrip transmission lines; and one end of the vertical copper line is vertical to the center of the grounding plane. According to the invention, in the working bandwidth, the radiation efficiency of four modules all exceed 80 percent; and compared with the major traditional diversity antennas with a boardband mode, the high-isolation four-port diversity antenna can provide a wider radiation range in different polarization modes, thereby greatly improving the system property. In addition, when the high-isolation four-port diversity antenna is used for an array structure, additional angle flexibility can be formed in aspects of wave beam control and wave beam forming.

The invention discloses a novel broadband low-profile dielectric lens antenna, and belongs to the technical field of microwave. The antenna feed source part of the lens antenna comprises two layers of dielectric plates; rectangular gaps in the metal grounding surface of the bottom layer dielectric plate of the feed source are coupled with square patches on the upper layer dialectic plate through an air layer to generate polarized wave; a novel cavity-free part reflective surface consists of two layers of frequency selection surfaces with dielectrics, and the reflective phases are changed along with frequencies in a positive slope manner and are matched with the feed source antenna so as to greatly improve the 3dB gain bandwidth of the antenna finally; by virtue of the cavity-free part reflective surface, the profile height of the resonant cavity antenna is lowered, so that the low profile characteristic of the antenna is realized; in addition, the reflective coefficient of the novel part reflective surface is higher than that of the similar type surface, so that the working frequency band gain of the antenna is improved stably; and in general, the design has certain application prospect.

The invention discloses a broadband circularly polarized millimeter wave multi-feed multi-beam lens antenna. The antenna comprises a multi-port broadband circularly polarized planar feed antenna array(1) and a planar lens (2); a plane of the multi-port broadband circularly polarized planar feed antenna array (1) and a plane of the planar lens (2) are arranged in parallel; and a signal of the multi-port broadband circularly polarized planar feed antenna array (1) is output or received through the planar lens (2). A plurality of focal points are distributed on the planar lens (2) in a phase-shifting mode, and the planar lens is formed by arranging completely identical anisotropic unit structures (5) in a periodic mode. Each anisotropic unit structure (5) is composed of an upper-layer metalpatch (5a), a middle-layer metal patch (5b) and a lower-layer metal patch (5c). The antenna can realize a multi-feed multi-beam characteristic and has a wide application prospect in the aspects of wireless communication and satellite communication.

An aperture-coupled antenna has a first radiation electrode, a ground area and a wave guide which is implemented to supply energy to the antenna. The wave guide is arranged spaced apart from the ground area on a first side of the ground area, and the first radiation electrode is arranged spaced apart from the ground area on a second side of the ground area. The ground area has an aperture including a first slot in the ground area, a second slot in the ground area and a third slot in the ground area. The first slot and the second slot together form a slot in the shape of a cross. The third slot passes through an intersection of the first slot and the second slot. The wave guide and the radiation electrode are arranged such that energy can be coupled from the wave guide through the aperture to the patch.

The invention discloses a low-profile adjustable tri-band antenna. Deformable fractal dipole upper and lower arms are printed on the upper and lower surfaces of a first medium substrate respectively and are symmetric about a horizontal center line of the substrate. A first-order radiating unit is connected with a dual feed microstrip line and extends to the edge of the first medium substrate. A corresponding inductance-connected direct-current offset line is adapted to the radiating unit of each order. Inner vertexes of radiating patches of second-order and third-order radiating units are connected through rectangular patches to form respective radiating units. A PIN switch is loaded between the radiating units of adjacent orders in order to achieve frequency adjustability. The first medium substrate is placed on a second medium substrate and isolated from the same with a foam board. EBG units in periodical arrangement are printed on the second medium substrate so that antenna gain is increased. The low-profile adjustable tri-band antenna has the advantages that the problems that the antenna is difficult to adjust under high frequency, a directional gram is instable and the profile is high are solved, the antenna can feature low-profile adjustability of high-frequency bands X, Ku and Ka, and the low-profile adjustable tri-band antenna is applicable to wireless communications and satellite communications.

The invention discloses a broad band low profile conic sleeve monopole antenna which comprises a monopole (1), a conic top loading sleeve (2), a top loading disc (3), a floor (6), first short circuit probes (4), a second short circuit probe (5) and a radio frequency interface unit (8). The monopole (1) is placed perpendicularly to the floor (6). The top loading disc (3) is placed at the top of the monopole (1). The top loading disc (3) and the monopole (1) are connected through screws. The top loading disc (3) is used for top loading to the monopole (1). The top loading disc (3) and the floor (6) form a short circuit through four first short circuit probes (4). A conic sleeve is added to the monopole so that circular ring top loading is performed to the sleeve, and therefore impedance bandwidth of the antenna is broadened effectively and the dimension of the antenna is reduced.

The invention discloses a circularly polarized multimode wideband antenna and microstrip power division phase shift network, which comprises an antenna and feed network, wherein the feed network consists of a primary feed circuit and a secondary feed circuit; the primary feed circuit consists of a power divider and a 180-degree wideband phase shifter which are concatenated, and is externally connected with a master port of a signal source; the secondary feed circuit comprises two feed circuit units; and each feed circuit consists of the power divider and a 90-degree wideband phase shifter which are concatenated. The circularly polarized multimode wideband antenna and microstrip power division phase shift network has high performance, and can be applied to four conventional satellite navigation positioning service systems; the antenna adopts radiation patch grooving to improve an impedance bandwidth, greatly reduces an antenna thickness, and has high radiation characteristics and electrical characteristics; and quadruple power division phase shift network feed is adopted so as to greatly increase a circular polarization bandwidth and circular polarization purity.

The invention provides an LTCC aperture coupling array antenna, belongs to the technical field of antennas and aims at overcoming the defects of an existing micro-strip array antenna in the aspect of giving consideration to miniaturization, broadband and high gain. The LTCC aperture coupling array antenna comprises upper and lower layer radiation metal patch units, upper, middle and lower layer dielectric substrates, a grounded metal layer, resonance apertures and a micro-strip feed network, wherein the upper layer radiation metal patch units are arranged in triangular lattices, and the lower radiation metal patch units are arranged in rectangular lattices. Compared with regular micro-strip patch array antennas based on organic media or ceramic substrates, the LTCC aperture coupling array antenna is capable of obtaining a larger antenna bandwidth under the same size limit and giving better consideration to the performance requirements of miniaturization, broadband and high gain of the patch antenna.

The invention discloses a mobile communication device, which is provided with a ground plane and an antenna, wherein the antenna is positioned on a dielectric substrate which is adjacent to the ground, and comprises a radiation part, a feed-in part and a short circuit unit; one end of the feed-in part is connected to a signal source, and the other end of the feed-in part is electrically connected to the radiation part; the feed-in part is also provided with a capacitive element or an open section; and the short circuit unit provides two different short circuit paths which electrically connect the radiation part to the ground. The mobile communication device and the antenna thereof operate with bandwidth ranges covering LTE700 / GSM850 / 900(704-960MHz) and GSM1800 / 1900 / UMTS / LTE2300 / 2500(1710-2690MHz) respectively, and the bandwidth ranges covers all the current mobile communication bands; and simultaneously, the size of the antenna is small, so that the antenna is suitable for thin mobile communication devices.

The invention relates to an improved Fabry-Perot resonant cavity antenna, belongs to the technical field of resonant cavity antennas, and aims at solving the problem that the present abry-Perot resonant cavity antenna is low in gain bandwidth. The antenna comprises a feed source and a portion reflecting plate, the feed source includes a rectangular patch antenna, the portion reflecting plate is arranged over the feed source in parallel, and the height of a resonant cavity body formed between the feed source and the portion reflecting plate is h; and the portion reflecting plate is of a double-layer coating structure, the upper surface of the portion reflecting plate includes a copper clad array of periodical arrangement, and the lower surface includes a hollow cross-shaped copper clad square array of periodical arrangement. A PRS structure of the portion reflecting plate enables a reflection value module value of the reflecting plate to be higher, the gain of the feed source antenna is thus improved, the phase and frequency of the reflection coefficient is positively correlated, and thus, the impedance bandwidth and the gain bandwidth are both improved.