32results about "Rhombic antennas" patented technology

A smart card having an extended communication distance includes a card body, at least one chip and at least one antenna attached to the chip, wherein the chip and the antenna are embedded in the card body. The smart card is characterized in that the antenna is provided with at least one metal core.

In an antenna configuration (3) having a first antenna arm (4) and having a second antenna arm (5), the two longitudinal directions (10, 11) of the two antenna arms (4, 5) enclose an acute opening angle (α) with one another, wherein the acute opening angle (α) has a value of between 15° and 90° and preferably between 25° and 45°.

An antenna is disclosed to efficiently ionize the atmosphere for the purpose of reducing the aerosol counts, and therefore the number of poluted particles in suspension in the atmosphere, by deposition to ground. The antenna includes peripheral nodes and a central node. Each of the peripheral nodes is connected to adjacent peripheral nodes through peripheral spokes. The peripheral nodes are also connected to the central node through radial spokes. Electric power is applied to the peripheral spokes and the radial spokes causing the antenna to charge the atmosphere through the emission of ions. The antenna minimizes an attenuation factor that reduces ionization efficiency and reduces the land requirements for its installation.

In an antenna configuration (3) having a first antenna arm (4) and having a second antenna arm (5), the two longitudinal directions (10, 11) of the two antenna arms (4, 5) enclose an acute opening angle (α) with one another, wherein the acute opening angle (α) has a value of between 15° and 90° and preferably between 25° and 45°.

A variable antenna apparatus for a mobile terminal. The variable antenna apparatus includes a radiation component that is rotatably coupled with the mobile terminal, a feeding component that is adjacent to a first end part of the radiation component and electrically connected to a radio frequency board of the mobile terminal. A grounding component is adjacent to the first end part of the radiation component and selectively connected to a ground of the radio frequency board as the radiation component is rotated. The antenna apparatus is accommodated in a terminal so that it is possible to conveniently carry the terminal, and the antenna is rotatably protruded from the terminal during a telephone call, such that appropriate antenna gain is achieved.

Linear elements 101a to 101d are conductors, which have the element length equivalent to half a wavelength, have been placed so that they may draw a diamond shape. Delay elements 102a and 102b are bent conductors, which have a total length equivalent to one fourth wavelength and a length L2 equivalent to one eighth. The linear elements 101a and 101c are connected one another via the delay element 102a, while the linear elements 101b and 101d are connected one another via the delay element 102b. A feeding section 103 is connected to each of the ends of the linear elements 101a and 101b for feeding power to them. Between the tips of the linear elements 101c and 101d, a gap with a length L3 is left. A reflector 104 has been placed at a distance h from a diamond-shape antenna with delay elements along the −Z axis, the distance h being equivalent to 0.42 wavelength. This achieves the antenna device, which may be suitably mounted on any of small wireless apparatuses and form a primary beam, of which horizontally-polarized wave or vertically-polarized wave tilts toward the horizontal direction.

An antenna apparatus capable of main beam direction switching is provided that achieves high gain with a small, planar configuration. Rhombic antenna sections composed of linear elements 101a through 101d, 102a through 102d, and 103a through 103d are arranged in the same plane, and the rhombic antenna sections are connected by linear linking elements 104a through 104d. Linear detour elements 105a and 105b are connected to the pair of vertices of the rhombic antenna sections arranged at each end. Feed points 106a and 106b are provided at the other opposite two pairs of vertices of any of the rhombic antenna sections, and the opposite vertices of the other rhombic antenna sections are connected by linear elements. A plate reflector is arranged at a distance h from, and parallel to, the surface on which the rhombic antenna elements are arranged.

A wideband antenna includes a radiation element, first and second extension elements, first and second reflection elements, and a feeding element. The radiation element is symmetric to a reference direction and has a top edge, a bottom edge, a first side edge, and a second side edge. A width of the radiation element gradually increases along the reference direction. The first and second extension elements are extended toward the reference direction respectively from two ends of the top edge and are mirror-symmetric to each other with respect to the reference direction. Widths of the first and second extension elements gradually decrease along the reference direction. The first and second reflection elements are respectively opposite to the first and second side edges and are mirror-symmetric to each other with respect to the reference direction. The feeding element is electrically connected to the bottom edge and has a feeding point.

A log periodic antenna includes first and second transmission lines parallel with each other; and a plurality of broadband radiation elements having first sides electrically connected to the first and second transmission lines, a predetermined angle being defined between the first sides of the broadband radiation elements and the first and second transmission lines, and second sides not electrically connected with the first and second transmission lines, the second sides having radiation surfaces larger than radiation surfaces of the first sides. A plurality of broadband radiation elements electrically connected with the first transmission line and a plurality of broadband radiation elements electrically connected with the second transmission line are positioned to face each other with reference to the first and second transmission lines.

System and method for determining gain characteristics of a circularly-polarized antenna. The method includes receiving a measured first amplitude of a forward gain between a circularly-polarized antenna probe of a first type and a linearly-polarized standard-gain antenna, a measured second amplitude of a forward gain between a circularly-polarized antenna probe of a first type and a circularly-polarized antenna under test, and a measured third amplitude of a forward gain between a circularly-polarized antenna probe of a second type and the circularly-polarized antenna under test. The method also includes determining a left-hand circularly-polarized gain and a right-hand circularly-polarized gain of the circularly-polarized antenna under test based on the measured first amplitude, the measured second amplitude, the measured third amplitude, and a cross-polarization level of the circularly-polarized antenna probes of the first and second types. The determination may be performed using one or more processors.