49 results about "Discone antenna" patented technology

The discone antenna includes a conical antenna element, having an apex, and a disc antenna element adjacent the apex of the conical antenna element. An inverted antenna feed structure, such as a flanged coaxial connector or coaxial cable, is connected to the disc and conical antenna elements and extends outwardly from the disc antenna element on a side thereof opposite the apex of the conical antenna element. The discone antenna with such an inverted feed structure facilitates an inverted positioning, for example, on vehicles, rooftops and / or control towers, etc., that will increase the bandwidth pattern in the direction of the potential target.

An apparatus includes a discone antenna including a cone-shaped element whose physical shape is at least partially defined by at least one pleat.

Wideband antennas with omnidirectional coverage have both military and commercial applications. In one embodiment, the Planar Inverted Cone Antenna (PICA) is composed of a single flat element vertically mounted above a ground plane. A geometry of Planar Inverted Cone Antenna (PICA) is based on the conventional circular-disc antenna with trimmed top part having the shape of a planar-inverted cone, in a second embodiment, the Fourpoint antenna also provides balanced impedance over the operating band and has useful radiation patterns and dual polarization over its operating frequency.

A collapsible discone antenna is provided with an ultra wide band width by providing a collapsible conical skeleton cone, with the rods of the skeleton being provided with meander lines so as to effectively reduce the overall dimensions of the antenna by a factor of 2, with the antenna rods being electrically interconnected at their distal ends so as to eliminate performance degradation due to varying ground conductivities. A specialized feed configuration is used in one embodiment to feed multiple antennas stacked above a low band disc through the utilization of one or more coaxial lines which are wrapped around a ferrite toroid so that they may be passed up through the low-band disc without detuning the low band discone antenna. The use of the toroid inductor between the low-band cone and the low-band disc further reduces the low frequency cutoff of the antenna by markedly decreasing the VSWR at frequencies as low as 20 megahertz.

An antenna (and concomitant method of making and communications method) comprising a conical radiating element and a circular radiating element surrounding a base of the conical radiating element.

The invention discloses a microstrip array discone composite conformal antenna and aims at providing a composite antenna which is low in profile and easy to conform to a carrier. The antenna is realized through the following technical scheme. The technical scheme comprises the following steps that 1, a metal cone and a metal disc which are fixed on a cavity bottom of a reflection cavity are embedded to form a discone antenna; at least 2*2 rectangular radiation patch units are arranged on the dielectric substrate fixedly connected to the metal disc; the rectangular radiation patch units are connected in parallel and feed through one-in-four microstrip power divider; and the discone antenna and the microstrip array antenna form a composite antenna array which can radiate horizontal omnidirectional L-frequency band vertical polarization signals and can directionally radiate C-frequency band horizontal polarization signals to a zenith. A voltage standing wave ratio VSWR of the composite antenna is smaller than or equal to 2, and an isolation degree S21 of two ports is larger than or equal to 30 dB. The antenna has a multi-frequency broadband characteristic, and can meet requirements ofgain and airspace coverage required by an airborne platform L-band data link function and a radio altimeter function.

The invention discloses an ultrashort wave folding type discone antenna which comprises a telescopic component, a core rod, a top control disk, a sliding shaft, a flange casing, a main supporting pipe, a vertical-polarization conductor casing, a lower connecting disk, an upper connecting disk, eight horizontal-polarization long oscillators, eight horizontal-polarization short oscillators, eight oblique-polarization antenna vibrators and a signal processing circuit module. Under the mode that the operating frequency range of ultrashort waves is met, the range of operating frequency range of the antenna is expanded furthest to 20-3600MHz, and the signal receiving sensitivity is improved. The structure size of the antenna is reduced furthest, the weight is decreased, the size is reduced, and the force distribution of the whole cylindrical antenna structure is improved.

The discone antenna is a small communication antenna with broad voltage standing wave ratio (VSWR) bandwidth. The discone antenna includes a conical antenna element and a disc antenna element adjacent the apex thereof and including a proximal electrically conductive planar member and a spaced apart distal electrically conductive planar member being electrically connected together at respective peripheries thereof defining a folded ground plane. An antenna feed structure is coupled to the disc and conical antenna elements and includes a first conductor coupled to the proximal electrically conductive planar member, and a second conductor coupled to the conical antenna element and to the distal electrically conductive planar member. An impedance element, such as a resistor, may be connected between the second conductor and the distal electrically conductive planar member.

The present invention provides a single-polarization directional antenna / array directional antenna and its tdd communication system. The angle of the polarization direction of the single-polarization directional antenna and the vertical direction is the sum of 45-degree and the preset value. In one tdd communication system of the single-polarization directional antenna / array directional antenna, the angle of the polarization direction of the antenna and the vertical direction is the sum of the 45-degree and the preset value, the angle of the second antenna which direction is fully opposite to the first antenna and the polarization direction of the first antenna in the first antenna positive cover range is 90-degree; the antenna of the system is a single-polarization directional antenna / array directional antenna. The polarization direction of the receiving antenna and the emitting antenna generating interference signal differs by 90-degree or closes to 90-degree, the orthogonal polarization inhibition is formed, greatly reducing the interference.

A wireless apparatus capable of controlling radiation patterns and directions of antenna is provided. It comprises an antenna element, a ground plane, an antenna feed-point, and at least one slot or slit formed on the ground plane. The inclusion of such slots or slits in the wireless apparatus improves the radiation directivity of antenna, and greatly enhances the antenna gain on the horizontal plane. It also resolves the problems caused by shift of radiation patterns of antenna and the poor antenna gains for a conventional antenna apparatus. The wireless apparatus of the present invention has the advantages of simple structure and easy fabrication. The invention can be applied to various kinds of antennas, such as monopole antenna, shorted-monopole antenna, dipole antenna, loop antenna, and planar inverted-F antenna, etc.

An RFID tag includes a first antenna on which an IC chip is mounted and a second antenna extending from an end of the first antenna in a direction at right angles to the first antenna. The first antenna has an arbitrarily electrical length and the second antenna has an electrical length of λ / 2 or an integral multiple of λ / 2. A resin base film having a thickness of approximately 50 μm is disposed on the back side of the first antenna and the second antenna. With this configuration of a tag antenna, the second antenna resonates with the first antenna to exhibit a radio wave amplifying effect. Therefore, a long communication distance can be achieved even if the electrical length of the first antenna is chosen to be short or the thickness of the base film is chosen to be thin.

A low-visibility, fixed-tune, wideband, and field-diverse antenna provides cross-polarized fields enhancing signal communications but having helical antenna characteristics without severe circular polarization radiation thereby promoting a modern, futuristic, and disguised look for reliable communications. A generally flat, but helical, antenna is achieved in conjunction with a core substrate about which the antenna is wrapped, wound, or fixed. The core substrate, pitch or angle of the helix, length of the transmitting antenna, and copper traces thickness are chosen for a specific resonant frequency range. The length and width of the helix are chosen in order to dimension the helical antenna between its linear and circular polarization modes to thereby deliver field-diverse and cross-polarized transmission modes. In order to optimize the manufacturing process, holes may be created within the substrate. These holes are plated with conducting material so that conducting foil on opposite faces of the substrate may be electrically connected. The holes may be offset according to the pitch of the helix. Once the transmitting antenna has been fabricated upon the core substrate, the margin between the plated-through holes and the edge of the substrate may be separated by cutting, sawing, or stamping.

The invention discloses an application system of an ultra-wideband composite antenna. The system comprises a mounting bottom plate, a rotary table and an antenna cover. The rotary table is fixedly mounted on the mounting bottom plate. A fixed supporting column is arranged on the rotary table. A discone antenna is mounted on the fixed supporting column; a parabolic antenna is arranged above the discone antenna. A mounting base is fixedly connected to the top end of the fixed supporting column. A U-shaped installation groove is formed in the installation base, a driven rotating shaft is arrangedin the U-shaped installation groove, a connecting supporting column is fixedly installed on one side of the parabolic antenna, the connecting supporting column is fixedly connected with the driven rotating shaft through an installation shaft sleeve, and a driving rotating shaft is arranged at the end, close to the rotating table, of the fixed supporting column. Through combination of the parabolic antenna and the discone antenna, ultra-wide frequency band coverage can be met, and the whole system is reasonable in structure, small in size, light in weight and beneficial to installation and use. The antenna is simple in structure and convenient to use.

The invention discloses an improved-type omnidirectional broadband discone antenna, and the antenna comprises a bottom plate metal body, a feed connection column, a conical metal body, and a supporting rod. The lower end of the conical metal body is connected to the top of the supporting rod in a sleeved manner. The feed connection column is vertically disposed at the top of the conical metal body, and the bottom plate metal body is disposed at the top of the feed connection column. The bottom plate metal body is a cylindrical platform, and the periphery of the cylindrical platform is uniformly provided with bottom plate metal rod installation holes in a circle. The upper side of the conical metal body is provided with a circular truncated cone, wherein the upper part of the circular truncated cone is smaller and the lower part of the circular truncated cone is bigger. The lower side of the conical metal body forms an inverted circular truncated cone, wherein the upper part of the inverted circular truncated cone is bigger and the lower part of the inverted circular truncated cone is smaller. The inclined surface of the inverted circular truncated cone is provided with uniform conical metal rod installation holes in a circle. One side, close to the supporting rod, of the conical metal rod installation holes is provided with a rotating channel. The rotating channel takes the surface of the supporting rod as the channel wall, and the channel wall of the rotating channel is provided with a spring, wherein the inclination angle of the spring is 60-80 degrees. According to the invention, the installation and recycling process of the discone antenna is simplified, and the recycling efficiency of the discone antenna is also improved, and the man-made damage rate is reduced.