Abstract: An antenna assembly has a conductive line coupled to a feed point. An element is configured to resonate at a predetermined frequency. The element is electrically coupled to the conductive line and aligned perpendicular to the conductive line wherein the predetermined frequency of the element determines a distance from the feed point along the conductive line.

Abstract: A dual polarized variable beam tilt antenna having a superior Sector Power Ratio (SPR). The antenna may have slant 45 degree dipole radiating elements including directors, and may be disposed on a plurality of tilted element trays to orient an antenna boresight downtilt. The directors may be disposed above or about the respective dipole radiating elements. The antenna has a beam front-to-side ratio exceeding 20 dB, a horizontal beam front-to-back ratio exceeding 40 dB, a high-roll off, and is operable over an expanded frequency range.

Abstract: An antenna apparatus includes an electrically conductive section having peripheral edges, an antenna element coupled to the electrically conductive section, which transmits or receives electromagnetic signals, and an electromagnetic absorbing carbon material component. The carbon material component is generally disposed adjacent to the electrically conductive section, and includes a border region extending beyond the peripheral edges of the electrically conductive section by a given distance based on ?, where ? corresponds to the maximum wavelength of the one or more electromagnetic signals capable of being transmitted or received using the antenna element. Also, a distance between a surface of the carbon material component and the electrically conductive section is less than or equal to a value determined by ?.

Abstract: An antenna minimizes radiation from the outer conductor (44) of a coaxial cable (40) that is coupled to the antenna by providing a balancing tab (90) that lies near the connection (72) of the cable outer conductor (44) to the antenna. One antenna includes a Yagi structure (12) constructed of a plate of metal that forms a long boom (20) and a plurality of directors (28) extending laterally across the boom, with an electrical coupling loop mounted at a rear region of the Yagi structure. The coupling loop includes a folded dipole in the form of a metal coupling plate that forms a loop (54) with a gap (70), the loop having a laterally elongated front loop end (60). The Yagi structure is formed with a balancing tab (90) that lies forward of the loop, that has a lateral length (D) less than half that of one of the directors, and that extends from only one side (22) of the boom which is the side to which the outer coax conductor (44) is connected to the loop.

Abstract: An antenna system includes a VHF dipole antenna having a pair of rod elements disposed substantially in a line, and a UHF Yagi antenna having a radiator and a director disposed on the rod elements.

Abstract: An optical antenna collects, modifies and emits energy at light wavelengths. Linear conductors sized to correspond to the light wavelengths are used. Nonlinear junctions of small dimension are used to rectify an alternating waveform induced upon the conductors by the lightwave electromagnetic energy. The optical antenna and junctions are effective to produce harmonic energy at light wavelengths. The linear conductors may be comprised of carbon nanotubes that are attached to a substrate material, which may then be connected to an electrical port.

Abstract: A self-similar log-periodic antenna is described having a substantially frequency independent range of operation. An antenna arm is described comprising a plurality of substantially triangular conductive elements, 4, symmetrically disposed about a central conductive boom. Adjacent triangular elements differ by a constant scale factor from a largest element to a smallest element wherein the largest and smallest elements relate to the bandwidth of the antenna. Both planar and curved antenna arms are described. Other embodiments of the antenna arms include a conductive fin, 5, located along the boom and having a shape so as to preserve the self-similarity of the arm. The conductive fin is shown to reduce cross-polarization coupling when the antenna arms are assembled into an antenna. Two or more such antenna arms are assembled into an antenna by symmetrically locating such antenna arms in the shape of a pyramid (for planar arms) or in a conical shape (for curved arms).

Abstract: A printed circuit log periodic dipole array (LPDA) includes dipole elements with arms having reduced size through use of high effective permittivity substrate portions. The radiation efficiency degradation generally associated with use of a high permittivitty substrate can be be reduced through addition of magnetic particles to provide enhanced permeability in the high permittivity regions. The substrate preferably includes meta-materials. The feed line can provide a broadband transformation by being configured as a plurality of segments having quarter wave electrical lengths.

Abstract: An antenna system includes a VHF dipole antenna having a pair of rod elements disposed substantially in a line, and a UHF Yagi antenna having a radiator and a director disposed on the rod elements.

Abstract: An optical antenna collects, modifies and emits energy at light wavelengths. Linear conductors sized to correspond to the light wavelengths are used. Nonlinear junctions of small dimension are used to rectify an alternating waveform induced upon the conductors by the lightwave electromagnetic energy. The optical antenna and junctions are effective to produce harmonic energy at light wavelengths. The linear conductors may be comprised of carbon nanotubes that are attached to a substrate material, which may then be connected to an electrical port.

Abstract: In a log-periodic monopole antenna array of the type described in U.S. Pat. No. 3,286,268, each antenna of the array having active elements spaced over the top surface of a ground structure and grounded parasitic elements interspersed between the active elements, the improvement of means for mechanically and electrically connecting the parasitic elements to a non-solderable ground structure comprising an elongated block compressed into a correspondingly shaped groove in the structure. Screw means threadedly engage the ground structure in a direction transversely of the top surface thereof and abut against the block. The lower strip portion of the parasitic elements is disposed in the groove between the block and a groove side wall and is compressed therebetween when the screw means is tightened into the structure and against the block.

Abstract: A broadband antenna of miniature size employs an array of dipole elements whose inner ends are connected to a pair of closely spaced parallel central conductors. Three pairs of dipole elements are disposed in a symmetrical array and extend outwardly from the central conductors. The longest pair of dipole elements are capacitively end loaded and the length of that longest pair is approximately one eighth of a wavelength at the lowest frequency in the broadband. The length of the shortest pair of dipole elements is in the range of a third to a quarter of the wavelength at the highest frequency in the broadband. The third pair of dipole elements is a half wavelength at an intermediate frequency in the broadband. At the points where their inner ends are connected to the central conductors, adjacent pairs of dipole elements are spaced apart by a distance in the range of a half to a quarter of the wavelength at the highest frequency in the broadband.

Abstract: A support member mounted on an antenna boom includes a pair of upstanding spaced stanchions for supporting a signal feedthrough wire therebetween. An antenna element is pivotally mounted to the support member and has a bifurcated end which conductively connects with the feedthrough wire when the element is rotated from a folded closed position to an extended open position.

Abstract: A low cost broadband antenna system particularly suitable for television reception is described wherein the feed line includes a pair of conductors mounted in insulated manner one above the other above a support boom with the conductors having a fixed separation from each other and from the boom, a fixed conductor diameter and boom dimension maintaining a constant impedance along the line. Dipoles extend transverse the longitudinal axis of the boom and are symmetrically disposed about the axis with the dipole half elements on the same side of the axis successively connected alternately to the first and second conductors of the pair.