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

An antenna module is provided. The antenna module includes a radiator, a feed conductor, a ground element, a ground conductor and a short conductor. The feed conductor is connected to the radiator. The ground conductor connects the radiator to the ground element. The short conductor connects the feed conductor to the ground conductor.

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 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 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 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.

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.

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 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.