509 results about "Impedance bandwidth" patented technology

The invention discloses a circular polarized antenna with a wide wave beam width and a small size. The antenna comprises a square paster; two notch grooves of an open circuit of a terminal are arranged on the square paster, wherein the two notch grooves are mutually orthogonal; the paster is fixed on a square grounding reflecting surface by a coaxial line. And four short-circuit columns of the open circuit of the terminal are arranged on the reflecting surface, so that the size of the reflecting surface is reduced. According to the invention, a signal feeding technology is utilized to excite the two orthogonal notch grooves to work in a circular polarization mode. According to the invention, an impedance bandwidth reaches 19%, wherein a standing-wave ratio is less than 2; and a 3d axial ratio bandwidth reaches 3.8%. In an axial ratio bandwidth, a 3d B wave beam width reaches a value by adding 101.4 degrees with 1.4 degrees or subtracting the 1.4 degrees from the 101.4 degrees as well as a gain reaches a value by adding 5.76dBi with 0.18dBi or subtracting the 0.18dBi from the 5.76dBi. The circular polarized antenna has advantages of compact antenna dimension, light weight, low cost and easy manufacture. Especially, the circular polarized antenna has advantages of good impedance bandwidth, wide radiation wave beam, and high gain. Therefore, the circular polarized antenna can be widely applied to satellite communication and traffic navigation.

The invention discloses an L-waveband broadband circular polarization micro-strip antenna which comprises an upper-layer radiating antenna dielectric substrate and a lower-layer feed network dielectric substrate; a radiation patch is printed on the upper surface of the upper-layer radiating antenna dielectric substrate; four coupling patches are printed on the lower surface of the upper-layer radiating antenna dielectric substrate; an earth plate is arranged on the upper surface of the lower-layer feed network dielectric substrate, and a micro-strip power dividing phase-shifting feed network with one input end and four output ends is printed on the lower surface of the lower-layer feed network dielectric substrate; an air gap is formed between the upper-layer radiating antenna dielectric substrate and the lower-layer feed network dielectric substrate; each coupling patch is connected with one output end of the micro-strip power dividing phase-shifting feed network through a metal probe. The L-waveband broadband circular polarization micro-strip antenna is simple in structure, low in cost, easy to tune, wide in impedance bandwidth and circular polarization bandwidth and suitable for application to a maritime satellite communication system and a satellite positioning navigation system terminal.

The invention discloses a low-profile broadband dual polarization omni-directional antenna. The antenna comprises a vertical polarization monopole antenna and a horizontal polarization loop antenna which are arranged side by side, and the loop antenna is composed of four rotational symmetric arc-shaped dipoles. A metal cylinder wraps a monopole feed probe to increase the monopole bandwidth, and parasitic units and directors are loaded outside dipole arms to increase impedance bandwidth of the loop antenna and gain out-of-roundness of the loop antenna on azimuth planes is reduced. The low-profile broadband dual polarization omni-directional antenna basically comprises an upper medium plate (1), a lower medium plate (2), plastic screws (3), a round patch (4), a loop patch (5), the feed probe (6), the metal cylinder (7), a metal floor (8), metal short circuit columns (9), arc-shaped printed dipoles (10), L-shaped feed baluns (11), the parasitic units (12), the directors (13), a coaxial line (14), 100 ohm microstrip lines (15) and a small metal wafer (16).

In a planar inverted F antenna (PIFA), the feed and RF grounding connections are reversed yielding improved performance. Relative positioning of these connections is selected to tailor the characteristics of the antenna, such as resonant frequency and impedance bandwidth.

A circularly polarized antenna includes a dielectric substrate having a first via array in the form of a cylindrical cavity, a micro-strip circular patch antenna located at the center of the cylindrical cavity and formed on the dielectric substrate to radiate a signal, and a rectangular dielectrically loaded waveguide having a second via array and serving to feed the signal to the micro-strip circular patch antenna. Accordingly, the circularly polarized antenna prevents impedance mismatch between the micro-strip antenna and the dielectrically loaded waveguide and broadens an impedance bandwidth thereof.

Various planar inverted-F antenna configurations may include an antenna element formed on the top of a PCB and a ground element formed on the bottom of the PCB. Two or more slots may be included in the antenna element for reducing the antenna area while maintaining a suitable impedance bandwidth. A slot may be included in the ground element for reducing the ground area while increasing radiation efficiency. A folded ground may be formed on the top of the PCB for reducing system area while maintaining suitable performance. By moving the folded ground closer to the antenna element and increasing the PCB thickness, significant reductions in system area may be achieved, while maintaining or improving performance in terms of radiation pattern, radiation efficiency and impedance bandwidth.

Various planar inverted-F antenna configurations may include an antenna element formed on the top of a PCB and a ground element formed on the bottom of the PCB. Two or more slots may be included in the antenna element for reducing the antenna area while maintaining a suitable impedance bandwidth. A slot may be included in the ground element for reducing the ground area while increasing radiation efficiency. A folded ground may be formed on the top of the PCB for reducing system area while maintaining suitable performance. By moving the folded ground closer to the antenna element and increasing the PCB thickness, significant reductions in system area may be achieved, while maintaining or improving performance in terms of radiation pattern, radiation efficiency and impedance bandwidth.

Provided is dual-band inverted-F antenna for GSM, DCS, and PCS bands comprising a primary radiating member including integral first and second metallic strips, a feeding point, and a first shorting point wherein a long current path is created in the first strip such that the antenna can operate in a first low frequency operating mode, and a shorting current path is created in the second strip such that the antenna can operate in a second high frequency operating mode; a secondary radiating member comprising a second shorting point; a branch line shorting strip having one grounded end and a bifurcation including a first branch connected to the first shorting point and a second branch connected to the second shorting point; and a feeding member interconnected the feeding point and a signal source. Operating frequencies of the antenna are 90 MHz and 300 MHz respectively when it operates in 3.5:1 VSWR impedance bandwidth.

A broadband antenna has a substrate, a coupling conductor, a conductor string, a ground conductor and a ground plane. The coupling conductor has a first coupling member and a second coupling member being separated from each other. The conductor string and the ground conductor are connected to the second coupling member. The conductor string extends along a direction opposite to the second coupling member. The ground conductor is connected to the ground plane. The broadband antenna uses the coupling conductor and the ground conductor to adjust input impedance for impedance match. The conductor string functions as a multi level resonance circuit to increase impedance bandwidth.

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.

A microstrip patch antenna having high gain and wide band is disclosed. The microstrip patch antenna includes: a first patch antenna layer for radiating a energy supplied from transmitting/receiving feeding circuit and a first radiation patch electrically coupled to the first dielectric layer and supplying the energy to a receiving feeding circuit electrically coupled with the first radiation patch, wherein the energy is supplied by electromagnetic coupling of a first parasitic patch and second parasitic patch; a second patch antenna layer for improving impedance bandwidth of energy received through the first parasitic patch arranged in between the second dielectric layer and the third dielectric layer and radiating the improved impedance bandwidth; and a third patch antenna layer for improving a gain of the energy received through the second parasitic patch arraigned in between the fourth dielectric layer and the fifth dielectric layer.

The invention relates to a wide band one-layer microstrip patch antenna, which solves the problem of narrow impedance width in the currently common microstrip antenna. The microstrip patch of the antenna is a one-layer microstrip patch; one end of a stair-stepping coplane microstrip line with two widths is inserted in the patch antenna by the open slot on a convex microstrip patch, and the other end of a feeding microstrip line is positioned at the edge of a microstrip dielectric-slab; a concave metal carinal cavity is arranged at the back surface of the microstrip dielectric-slab excluding the position corresponding to the microstrip patch and in the middle of structural mounting plate. The wide band one-layer microstrip patch antenna can form a large microstrip patch antenna array easily, which is in favor of impedance matching of the antenna, the subnetwork design for microstrip work, the weight reduction of the antenna and the bandwidth widening of the antenna; the wide band one-layer microstrip patch antenna of the invention has the advantages of simple and compact structure and small cross section, which improves the telecommunication performance and reduces the whole weightof the antenna array.

The invention provides a small-sized double-frequency active navigation antenna device which comprises a suppression plate, a first microstrip patch, a second microstrip patch, a first substrate and a second substrate. The first microstrip patch is arranged on the top face of the first substrate, the second microstrip patch is arranged on the top face of the second substrate, the second microstrip patch is arranged between the first substrate and the second substrate, and the second substrate is arranged on the top face of the suppression plate; the first microstrip patch, the second microstrip patch, the first substrate and the second substrate are arranged in a 45 degrees inclined angle in an axial direction with the suppression plat. The device improves the the axial ratio, the impedance bandwidth, the stability of a phase center of the antenna, the signal receiving ability of a low elevation GNSS (Global Navigation Satellite System) and an ability to resist multipath interference, and the placing form of the antenna microstrip patch is more applicable to the actual handheld device application. By means of a combination way of a low insertion loss filter and a out-of-band high suppression filter, the noise figure is low and the antijamming capability is improved. The inside antenna and the outside arranged antenna have the advantages of being quick in switching speed, simple in operation and high in insulation.

The invention relates to a broad-band high-gain scannable panel antenna of parabolic reflection surface feeding. A radiation unit is a step-type variable inclination continuous transverse stub groove (VICTS). A feeding network comprises a series connection feeding structure and a parabolic reflection surface feeding network. An electromagnetic wave is reflected into a plane wave through the parabolic reflection surface type feeding network, is coupled to an upper-layer series connection feeding network and finally is radiated to a free space through the VICTS. Through relative rotation between upper and lower layers of a parallel plate waveguide, wave beam scanning is realized. The antenna of the invention covers a satellite communication ku wave band, an antenna work frequency is 10.2GHz-14.8GHz and an impedance bandwidth reaches 36.8%. At a 13GHz frequency point, a 25.7dBi gain is possessed. A antenna scanning angle scope is from 0 DEG to 56 DEG. Compared to a traditional communication in moving system antenna, by using the antenna of the invention, the feeding is simple; wave beam scanning is easy to realize; a dynamic response is fast and is in a panel shape; and a large engineering application prospect is possessed.

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.

An ultra high frequency antenna includes a first plane, a second plane opposite to the first plane by a distance, a driven dipole, at least a parasitic element having an indentation, and a balun. The balun includes a coplanar strip line and a microstrip line which has a first strip, a second strip area parallel to the first strip, and a third strip perpendicular to the first and second strips. The coplanar strip line coupled to a truncated ground plane with two narrow slots. The present planer antenna features a compact size, wide impedance bandwidth, moderate gain, and excellent front-to-back ratio. This antenna is well suitable for the applications in RFID handheld readers.

The invention relates to the technical field of an antenna and particularly relates to a high isolation low cross polarization dual-polarization microstrip array antenna. The microstrip array antennacomprises a parasitic layer, a radiation layer, a dielectric layer between the parasitic layer and the radiation layer, a feeding layer and a fixing member. The microstrip array antenna is advantagedin that a high dielectric constant substrate and an H-shaped gap coupling structure are employed to improve feeding coupling efficiency, the gap size is reduced, inter-port isolation and the cross polarization level are improved, a parasitic patch is introduced to broaden impedance bandwidth of the antenna, the higher antenna gain is obtained through the 2*2 array structure, through designing therelatively sparse parallel feed network and arranging metal through holes in dense feeders, mutual coupling between the feeders is reduced, inter-port isolation is further improved, and the cross polarization level is reduced.

The invention provides a small-sized wideband high-isolation four-unit multiple input multiple output (MIMO) antenna array, which greatly improves the impedance matching under the condition of extremely small influence on isolation between antenna units by using a double-band structure and an impedance matching structure, so the MIMO antenna unit remains the original wide impedance bandwidth to the greatest extent, good impedance bandwidth can be obtained by properly adjusting the double-band structure and the impedance matching structure, and the isolation is slightly influenced. Because theimpedance matching structure and the double-band structure bring extra capacitance for the antenna unit which is substantially inductive, the influence of cross coupling on return loss is effectivelyreduced (counteracted). In other words, the design can independently adjust the impedance bandwidth. Therefore, the antenna unit can achieve excellent impedance bandwidth under the condition of smallsize, so the antenna unit becomes the best choice of an MIMO antenna array element.

The invention discloses a filtering antenna with low profile, wide band and high gain. The antenna comprises an electromagnetic super-surface radiator and a feed part. The electromagnetic super-surface is constituted by non-uniformly small electrical units and is used as a high-efficiency radiator so that the bandwidth and gain of antenna are increased. At the same time, radiation zero points can be produced, and frequency selectivity can be increased through adjusting roll-off degree of an upper edge of a pass-band. According to the antenna, discrete micro-strip coupling slits are creatively used for feeding; metal via holes are introduced in between the micro-strip and floor; good filtering effect of low frequency stop band is guaranteed; roll-off degree of pass-band lower edges is increased. According to the invention, electromagnetic super-surface with filtering effect is creatively designed and is applied in filtering antenna; the antenna structure is simple and no complicated filtering circuit is used; The height is only 0.06[lambda]0; 10dB impedance bandwidth is 28.4%; antenna loss is low and efficiency reaches up to 95%; in-band average gain is 8.2dBi; out-band rejection is over 20dB; the stop-band is wide.

The invention relates to a double-frequency dual polarization stacked patch antenna based on microstrip Balun feed and a design method thereof. Compared with the prior art, the double-frequency dual polarization stacked patch antenna overcomes the defects of a double-frequency dual polarization antenna that the impedance bandwidth is too narrow, the isolation degree is low, and the cross polarization is large. Four rectangular caps are embedded on a first square patch, four feed probes are located in the rectangular caps respectively, and all penetrate through an upper microwave dielectric substrate, a middle microwave dielectric substrate and a lower microwave dielectric substrate, the upper ends of the feed probes are connected with the rectangular caps respectively, the lower ends of two of the feed probes are connected with two output ports of a first microstrip Balun unit respectively, and the lower ends of the other two feed probes are connected with two output ports of a secondmicrostrip Balun unit respectively. The double-frequency dual polarization stacked patch antenna based on the microstrip Balun feed and the design method thereof have the advantages that the relativebandwidth is large, the isolation degree is high, the cross polarization is small, and radiation patterns are symmetric, and are applicable to WiMAX and WLAN wireless communication systems.

The invention provides an antenna module and a mobile terminal. The antenna module is applied to a mobile terminal, the mobile terminal comprises a 3D glass back cover, the antenna module comprises apatch antenna arranged on the inside of the 3D glass back cover and spaced apart from the patch antenna by a preset distance, the patch antenna is fed by a probe, and the patch antenna operates in a millimeter wave band. The antenna module and the mobile terminal provided by the invention can effectively improve the impedance bandwidth by changing the feeding point position.

The invention discloses a dual-polarized multi-system compatible antenna which comprises an upper-layer circular capacitance loading metal patch, a monopole metal column, an upper-layer medium baseplate, a first short-circuit pin, a second short-circuit pin, an annular metal patch, an intermediate-layer first medium baseplate, L-shaped probes, an intermediate-layer second medium baseplate, a metal floor, a bottom-layer medium baseplate and a bottom-layer Wilkinson power divider, wherein the Wilkinson power divider is connected with the two L-shaped probes which are orthogonal mutually for performing coupling feed on the annular metal patch, the outer edge of the annular metal patch is circular, the inner edge of the annular metal patch is elliptical, the ratio of a long shaft to a short shaft of an ellipse is regulated, and then the axial ratio performance of the antenna can be regulated; and the upper-layer circular capacitance loading metal patch, the monopole metal column, the first short-circuit pin and the second short-circuit pin constitute a capacitance and inductance loading monopole antenna by inductance loading, thereby effectively reducing the size of the antenna. The antenna has the characteristics of small size, large axial ratio bandwidth, large impedance bandwidth, compact structure and the like.

The invention provides a back cavity slot antenna dual-frequency millimeter wave antenna based on a substrate integrated waveguide (SIW). The antenna comprises a radiation layer, a feed layer and a composite conversion structure, wherein the radiation layer is composed of a first metal coating and a first rectangular dielectric plate, the first metal coating is etched with two mutually parallel rectangular radiation slots, the first rectangular dielectric plate is provided with first metalized through holes for forming a circular SIW resonant cavity; the feed layer is composed of a second rectangular dielectric plate, a second upper metal coating and a second lower metal coating, the second rectangular dielectric plate is provided with second metalized through holes distributed in a gradually changing U-shaped manner so as to form a substrate integrated waveguide, and the second upper metal coating is etched with a rectangular coupling slot for slot coupling feed. The back cavity slotantenna dual-frequency millimeter wave antenna realizes the performance of millimeter wave dual-band radiation, and solves a technical problem that the dual-frequency millimeter wave antenna in the prior art is narrow in impedance bandwidth, low in antenna radiation gain and efficiency and complex in feed structure.

The invention discloses a broadband broad-angle circular polarization overlapping microstrip antenna which is low in profile, wide in axial ratio and impedance bandwidth, and good in wide-angle axial ratio performance. According to the technical scheme, an upper-layer rectangular microstrip metal patch (9) serving as a parasitic radiator is attached under a covering layer dielectric slab (1), a lower-layer rectangular microstrip metal microstrip patch (8) serving as a driving radiator is attached to the upper portion of a bottom-layer dielectric slab (5), the upper-layer rectangular microstrip metal patch works at a high-frequency end in a resonance mode, and the lower-layer rectangular microstrip metal microstrip patch works at a low-frequency end in a resonance mode; a cavity with the dielectric slabs as walls is formed in the central area of a rectangular box body, the cavity area is filled with a dielectric body of which the dielectric constant is similar to that of the air, a feed probe (10) is fixedly connected with the lower-layer rectangular microstrip metal microstrip patch through a metallized via hole, the metallized via hole penetrates through the bottom-layer dielectric slab, and the diameter of the metallized via hole is larger than the feed probe. By means of the broadband broad-angle circular polarization overlapping microstrip antenna, a wider work bandwidth can be achieved.

The invention discloses a microstrip sequential rotation array antenna based on a series and parallel feeding network. A first antenna unit, a second antenna unit, a third antenna unit and a fourth antenna unit in the array antenna are arranged on a first lambda/4 microstrip impedance transformation line, a second lambda/4 microstrip impedance transformation line, a third lambda/4 microstrip impedance transformation line and a fourth lambda/4 microstrip impedance transformation line in the series and parallel feeding network according to the serial rotation way; a feeding input end, a first feeding section, a second feeding section and a third feeding section on the series and parallel feeding network are serially arranged to form a three-quarter circular ring according to the signal input and output flow direction. The single antenna unit in the array antenna adopts the square corner cut patch design way, the processing and the forming are simple; furthermore, the single antenna unit adopts the microstrip line feeding way of allocating branches by bending, thereby being capable of leading a plurality of antenna units to conveniently constitute the array and configure at the same time of matching. When in array constituting process, the serial rotation array way and the series and parallel feeding network are adopted, thereby significantly improving the impedance bandwidth and the circular polarization purity of the antenna, reducing the loss of a feeding line and improving the gain.