36results about How to "Increased low elevation gain" patented technology

The invention relates to an antenna technology, and provides a satellite positioning antenna device. Therefore, the requirements of low elevation gain, a good circular polarization axial ratio and high receiving and dispatching isolation are met. The satellite positioning antenna device comprises an upper layer microstrip antenna, an interlayer microstrip antenna, a lower layer microstrip antenna and a PCB, wherein a phase shifting feed network is arranged on the back side of the PCB. A feed probe of the lower layer microstrip antenna, a feed probe of the interlayer microstrip antenna and a coaxial cable fed by the upper layer microstrip antenna are connected with the feed network, a first plated-through hole is formed in the center of the lower layer microstrip antenna, a second plated-through hole is formed in the center of the interlayer microstrip antenna, and the feed probe of the interlayer microstrip antenna is provided with a third plated-through hole in the lower layer microstrip antenna. A dielectric plate of the upper layer microstrip antenna, a dielectric plate of the interlayer microstrip antenna and a dielectric plate of the lower layer microstrip antenna are consistent in diameter and size and different in dielectric constant.

A tri-band satellite navigation antenna for a COMPASS, a GPS and a GLONASS comprises three layers of micro-strip antenna bodies, feed coaxial probes, metal clamp plates, strip line mediums, feed networks and a set of metal screws. High-dielectric-constant ceramic mediums are adopted in all the mediums of the three layers of micro-strip antenna bodies so as to reduce the size of the antenna. Circular polarization of the first-layer micro-strip antenna body is realized through the methods of single-point feed and angle cutting on a metal patch, and circular polarization of the second-layer micro-strip antenna body and circular polarization of the third-layer micro-strip antenna body are realized through double-point feed. The number of the feed probes contained in the medium of each layer of micro-strip antenna body is not more than two, so that three ports have better electromagnetic isolation. The set of metal screws is arranged around the micro-strip antenna bodies, the metal screws can be used for fixing the metal clamping plates and strip line feed layers, and the metal screws can also expand the lobe width of the antenna. The tri-band three-port antenna has the advantages of being small in size, low in section, wide in lobe, good in low elevation angle gain and axial ratio and high in port insulation degree, and suiting to be used as a satellite navigation terminal receiving antenna.

The invention provides a satellite positioning navigation antenna, the working bandwidth of the antenna covers the main satellite navigation frequency range completely, and requirements of broadband work and high/low elevation angle gain are met. The antenna comprises a spiral radiation body, a feed network and an RF socket, the spiral radiation body is in threaded connection with the feed network, the RF socket is fastened to a base plate of the feed network, and an internal conductor of the RF socket is electrically connected with the input end of the feed network. The work frequency range of the antenna can cover the main navigation positioning frequency range from 1164MHz to 1614.5MHz, the relative bandwidth reaches 33%, the antenna is compatible with main satellite navigation positioning systems (including GPS of the USA, GLONASS of Russia, GALILEO of the EU, and Beidou of China) in the globe, compared with a routine microstrip navigation positioning antenna at present, the low elevation angle gain is improved substantially, and the antenna of the invention can serve as a multi-mode broadband navigation positioning antenna of a satellite.

The present invention discloses a satellite dual-band antenna. The satellite dual-band antenna comprises a high-frequency antenna radiator, a low-frequency antenna radiator, a first probe, a second probe and an antenna pedestal, the high-frequency antenna radiator comprises a first dielectric body and a high-frequency antenna radiation surface being subjected to laser etching at the outer surfaceof the first dielectric body, the low-frequency antenna radiator comprises a second dielectric body and a low-frequency antenna radiation surface being subjected to laser etching at the outer surfaceof the second dielectric body, the bottom portion of the antenna pedestal is connected with a PCB, the upper portion of the antenna pedestal is provided with a cavity, the high-frequency antenna radiator and the low-frequency antenna radiator are stacked in the cavity, the high-frequency antenna radiator is located above the low-frequency antenna radiator, the high-frequency antenna radiator and the low-frequency antenna radiator perform feed through the first probe and the second probe, excitation amplitudes of the first probe and the second probe are the same, and the excitation phase difference of the first probe and the second probe is 90 degrees. The satellite dual-band antenna relates to the technical field of communication, is higher in reliability, is provided with the antenna pedestal, adds antenna pattern beam width and achieves miniaturization.

The invention relates to a broad beam navigation antenna adopting an electromagnetic band-gap structure and a novel installation method thereof. The method comprises the following steps: firstly, the index parameters of the antenna, such as the working frequency, the standing wave ratio, the gaining, and the like are ensured, a common patch antenna is selected or designed, and the bottom of the common patch antenna is provided with a metal floor with a proper size as a supporting structure; the parameters of the electromagnetic band-gap structure are designed by using HFSS software according to know parameters, and the electromagnetic band-gap structure is made by adopting the prior technology; the center of the electromagnetic band-gap structure is cut into a circular area, and the electromagnetic band-gap structure is pasted on the surface of a metal floor and is solidified by a conductive adhesive so that the surface of the patch antenna is parallel to the surface of the electromagnetic band-gap structure, thereby a board beam navigation antenna which adopts electromagnetic band-gap structure and the novel installation method is completely designed. The antenna made by the invention is a low elevation angle and high gain antenna, the transmission of surface waves is restrained and the low elevation angle gain of the antenna is increased by adopting the electromagnetic bandgap structure and the novel installation method thereof.

The invention discloses a GPS antenna positioning structure, including a helical antenna group and a PCB. The helical antenna group is welded together with the PCB by ultrasonic welding, the helical antenna group includes a four-arm helical antenna, the single-arm helical antenna is composed of two gradient helixes; the PCB comprises a horizontal substrate and a vertical substrate formed by a Wilkinson phase-shift feed network; the horizontal substrate is provided with a first radio frequency port, a second radio frequency port, a third radio frequency port, and a fourth radio frequency port in matched connection with the helical antenna; and the second radio frequency port and the fourth radio frequency port are connected with 90-DEG phase shifters. The GPS antenna positioning structure has the beneficial effects that in a mode of optimizing the helical arm, wide-band operating performance can be better realized, the antenna beam width is widened, and the low elevation angle gains ofthe antenna are improved.

The invention provides a hollow circular double-band single-layer microstrip antenna, which adopts the hollow circular microstrip radiation mode, and can not only work in two frequency points concurrently without increasing the thickness of the antenna, but also can significantly improve the low elevation gain as compared with the ordinary microstrip antenna. The hollow circular double-band single-layer microstrip antenna comprises a metal radiation plate, a medium substrate and a metal reflective substrate, wherein the metal radiation plate and the metal reflective substrate are respectively arranged on the upper surface and the lower surface of the medium substrate, and the metal radiation plate is a hollow metal radiation plate that excides the center circular area so that the surface current flows along the edge of the hollow area. By changing the current path, radiation can be realized or the electromagnetic signals of the high frequency and low frequency points can be received. The metal radiation plate is provided with coaxial feed points used for connecting with a feeder line, and the electromagnetic wave can be fed in.

The invention relates to the technical field of circularly polarized antennas of Beidou systems, in particular to a miniaturized multi-frequency antenna which comprises a circuit board, at least two ceramic antennas which are stacked and have different frequency bands and at least one ceramic antenna which is independently arranged are arranged on the circuit board, and an elastic connecting piece is arranged between a feed needle and a ceramic dielectric layer. The elastic connecting piece comprises an annular inner ring and an annular outer ring, the annular inner ring and the annular outer ring are connected through a connecting end and then spread in a diffusion mode in the axial direction, the annular inner ring is attached to the feed needle, and the annular outer ring is attached to the inner wall of the metal through hole in the ceramic dielectric layer. According to the invention, the low-elevation gain of each frequency band is effectively improved, the damage of the ceramic dielectric layer in the welding process is avoided through the use of the elastic connecting piece, and the elasticity of the elastic connecting piece can cope with the problem of local damage of the joint caused by impact in the use process compared with welding. Meanwhile, the invention further provides a manufacturing method of the miniaturized multi-frequency antenna, and the manufacturing method has the same technical effect.

The invention discloses a wide-beam frequency-reconfigurable printed four-arm spiral navigation antenna which comprises an independent lower spiral body, an independent upper spiral body and an independent parasitic oscillator. The upper spiral body comprises a second dielectric sheet, a second spiral arm printed on the second dielectric sheet, a second short circuit connecting arm printed on the second dielectric sheet and a second mechanical structure for supporting the second dielectric sheet; the lower spiral body comprises a first dielectric sheet, a first spiral arm printed on the first dielectric sheet, a first mechanical structure supporting the first dielectric sheet and a feed probe arranged on the bottom floor. The bottom floor is provided with four probes for feeding, feeding is carried out through the four probes at the bottom, and the circular polarization characteristic of the antenna is achieved by endowing four signals which are equal in amplitude and have the phase difference of 90 degrees in sequence. According to the invention, a single structure covers a global navigation frequency band and broadens a directional diagram wave beam, the gain at a low elevation angle is improved, the anti-interference capability is enhanced, and the antenna has the characteristic of miniaturization when being used as a single-frequency-band antenna.

The invention relates to a load resistant microstrip antenna, comprising a radiation piece, a dielectric layer and a grounding layer which are stacked in sequence, wherein the dielectric layer comprises more than two dielectric material layers which are different in dielectric constant; and the dielectric layer comprises a first dielectric material layer contacted with the radiation piece and a second dielectric material layer contacted with the grounding layer, and the dielectric constant of the second dielectric material layer is greater than the dielectric constant of the first dielectric material layer. The load resistant microstrip antenna can improve the low-elevation gain.

The invention discloses a dual-frequency wide-beam microstrip antenna working in an S wave band. The dual-frequency wide-beam microstrip antenna comprises an upper-layer metal radiation patch, an upper-layer dielectric substrate, a metal screw, a lower-layer metal radiation patch, a lower-layer dielectric substrate, a metal boss and a metal reflecting plate, wherein the upper-layer dielectric substrate, the lower-layer dielectric substrate, the metal boss and the metal reflecting plate are sequentially arranged from top to bottom, the metal boss is in a bowl shape, the plane of the bottom of the bowl is fixed to the center of the top surface of the metal reflecting plate in an upside-down mode upwards, reverse current appears in the front top direction of the antenna by changing the length of an emission path of electromagnetic waves, the directional diagram of antenna is enabled to be saddle-shaped consequently, the upper-layer metal radiation patch is adhered to the center of the top surface of the upper-layer dielectric substrate, the lower-layer metal radiation patch is adhered to the center of the top surface of the lower-layer dielectric substrate, and the upper-layer dielectric substrate and the lower-layer dielectric substrate are fixed on the top surface of the metal boss through a plurality of metal screws. According to the invention, the problems of narrow beam and insufficient low-elevation gain of a satellite-borne antenna are solved, and the miniaturization of the antenna is effectively realized.