Abstract: A one-piece array antenna folded dipole radiating element is formed from a wide, thin conductor. This element is suitable for attachment to a microstrip or other feed circuit. The radiation element includes a folded dipole portion, a balanced transmission line portion and may include a balun portion. These various portions are formed by providing an appropriately shaped slot or aperture in the thin conductor.

Abstract: A coplanar printed circuit balun for connecting an unbalanced feedline to a balanced dipole antenna.

Abstract: A collinear dual dipole antenna is split into two sections which are connected by a central conductor extending in spaced parallel relation within hollow support mast sections, and forming an effective transmission line providing RF continuity at a high band frequency f, and discontinuity at a low band frequency 1/2 f. The configuration provides a dual band antenna operating in either band from a single source without filtering and without modification of the antenna. In the high frequency band, the antenna operates as a dual dipole array. In the low frequency band, the antenna operates as a single dipole array with each mast section and its respective dipole acting as half of the single dipole array.

Abstract: An antenna for transmission or reception of broadcast signals has a primary element and a secondary element coupled to one another capacitively and inductively. The primary element has a continuous center conductor surrounded by a concentric conductor interrupted at its midpoint to present two adjacent feed line terminals. The corresponding outer ends of the conductors are electrically joined. The secondary element is parallel to the primary element and overlaps its complete length. It is preferably tubular, to encase and seal the primary element.

Abstract: An omnidirectional broad band antenna employs a slot and a pair of radiating arms excited by the slot. In one embodiment slots are formed in a coaxial transmission line and covered by a resin bonded filament wound glass fiber tube which serves as an integral radome and permits pressurization. The arms are of substantial girth and arc upwardly, downwardly respectively and circularly, one clockwise and the other counterclockwise thus providing a large spacing between arms. The antenna is characterized by a broad bandwidth and low VSWR.

Abstract: A miniature antenna which is rugged, extremely light-weight and which is especially adapted for reception across the entire FM band comprising an omnidirectional half-wave dipole having feed structure comprised of curved overlapping dipole element points connected to a solid state amplifier having staggered tuned input and output circuits. The input to the amplifier is maintained essentially balanced to preserve the omnidirectional pattern of the dipole.The physical location of the solid state amplifier is such that it is directly connected to the feed point of the dipole eliminating transmission line losses.The coaxial cable is employed in a diplexed manner for connecting the DC power supply to the solid state amplifier and for connecting the amplified output signal to an impedance converter which is to provide proper impedance match for the antenna input signals of an FM tuner/receiver.

Abstract: An omnidirectional broad band antenna employs a slot and a pair of radiating arms excited by the slot. In one embodiment slots are formed in a coaxial transmission line and covered by a resin bonded glass fiber layer which serves as an integral radome and permits pressurization. The arms are of substantial girth and one arcs upwardly and circularly and the other arcs downwardly and circularly thus providing a large spacing between arms. The antenna is characterized by a broad bandwidth and low VSWR.

Abstract: A microwave radio frequency signal is coupled from a coaxial line to a circular waveguide by an in line, slot-fed, open-ended, dipole termination of the coaxial-line, imbedded in a low loss dielectric material in the waveguide to excite the waveguide in a TE.sub.11 mode suitable for exciting a low backlobe dielectric rod radiator.

Abstract: A broadband isolation section comprised of a plurality of series connected able chokes having respective damping resistors shunted thereacross located between at least two dipole antennas mounted one above the other in a generally vertical plane. The isolator section is particularly adapted to be utilized with dipole antennas having respective pairs of radiating elements substantially aligned in a common vertical axis and being fed from respective radio signal sources by feedlines directed along the common vertical axis through the various radiating elements. The cable chokes included in the isolator section are formed from coaxial cable feedlines and the respective damping resistors shunted thereacross are connected to the sleeve or outer conductor of the feedline(s) feeding the upper antenna(s). Thus adjacent antennas have intermediate broadband isolator sections separating them.