Abstract: A VHF television receiving antenna arrangement includes a cabinet having a loop of electrically conductive material disposed on its top, back and sides, preferrably on the inside surfaces thereof. A gap in the loop defines first and second feed terminals to which circuitry for tuning the loop connects. The loop is tuned thereby over at least a portion of the television frequency bands, responsive to a control voltage. Signals from the tuning circuitry are coupled to a television receiver tuner by a transmission line. Such loops can also have capacitors connected across tuning gaps for making the directional response of the loop more uniform at relatively lower frequencies (e.g. VHF channels 2-6) or switching diodes connected across control gaps for changing the directional response of the loop at relatively higher frequencies (e.g. VHF channels 7-13).

Abstract: An antenna system is disclosed which has a loop antenna divided into n conductive members at n pairs of divisional points where n is a positive integer not smaller than 2, n feeders connected to the n pairs of divisional points respectively, a signal feeding point, and at least one impedance element. In this case, electrical switching circuits are connected between the n feeders and the impedance element, and an electrical control circuit is connected to the electrical switching circuits for selectively connecting the feeding point to one of the n feeders and at the same time for selectively connecting the impedance element to another of the n feeders, so that the directivity characteristic of the antenna system is variable controlled.

Abstract: A flush-mounted HF (2 to 30 megahertz) transmitting and receiving antenna is developed which is especially suitable for installation on a Jeep (CJ7) type vehicle. This antenna is formed by bonding a copper strip to the inside surface of the non-metallic top of the vehicle. The strip is grounded to the vehicle body just aft of the driver's door and runs overhead to the aft right lower corner of the non-metallic vehicle top which becomes the feed point for the antenna. The strip is connected in two places to an isolated aluminum skin bonded to the top of the vehicle. The antenna is suitable for use as a transmitting antenna provided an impedance matching device (coupler) is inserted between the antenna and the transmitter/receiver.

Abstract: A VOR/ILS antenna system for rotor aircraft eliminates rotor modulation of signals without varying rotor speed. The system comprises one or more loop antennas each having one or more closed loop windings mounted on the aircraft in a generally horizontal plane and having a conductive shield covering the windings and dielectrically separated therefrom and having a small gap breaking the continuity thereof. A dual loop VOR/ILS system for helicopters is particularly disclosed wherein the pair of loop antennas are mounted in a horizontal plane on opposite sides of the central vertical helicopter mast extending upwardly between a pair of cowling members in which the antennas are disposed. Each antenna has a gap in the shield facing inboard and a connection point for the windings opposite the gap and outboard.

Abstract: A vehicular mounted loop antenna which operates as an NVIS radio communicon antenna over one range of frequencies and as a vertically polarized whip antenna over another range of frequencies corresponding to the frequency range of a radio communication set equipped with a conventional whip antenna. A coupling loop of variable area and a transmitting loop are positioned in a common vertical plane on a horizontally disposed base member, with the coupling loop positioned within the transmitting loop. A variable capacitor is in circuit with, and is an integral element of, the transmitter loop to provide resonance over the desired operating frequency range.

Abstract: A square-loop directive antenna of half wavelength circumference is provided with improved front-to-back ratio and gain by placing capacitive reactances for 90.degree. phase shift in the sides, instead of inductive reactances as in the past, and with further improved front-to-back ratio and gain by placing divided reactances (inductive or capacitive) in the sides with just enough reactance to provide a phase shift of 22.5.degree. next to the driven side of the loop and the balance (90.degree.-22.5.degree.) next to the parasitic side of the loop.

Abstract: A P-band uniform loop antenna system simulating the small uniform in-phase urrent loop by using a number of smaller radiating elements that are connected in phase so that each current in each element is in phase. Thus, a small uniform loop radiation pattern is simulated, but the loop elements are arranged on a radius that is not small compared to a wavelength, and are located around a cylinder.

Abstract: An omnidirectional antenna array comprising a ferrite antenna inductively coupled to one leg of a loop antenna that lies in a plane parallel to the long axis of the ferrite antenna. The output signal may be taken from either of the antennas.

Abstract: The disclosure relates to an antenna system for C.B. radio use which is mounted upon a metallic base, such as the roof of an automobile, the antenna having the S-shape or Greek-key design configuration, the antenna being mounted at one end of the base through an insulating medium, the one end being coupled to a plate on the insulating medium which forms a capacitor with the insulating medium and the metallic base of fixed predetermined value. A variable capacitor is also formed between end extension of the plate and the free end of the antenna.

Abstract: A directional loop antenna, particularly for television signals, comprising a conductive member shaped into a folded dipole configuration is disclosed. Covering the conductive member is a plastic material which may comprise two coaxial coatings of different dielectric constants. The folded dipole legs are formed into a generally circular configuration with the folded ends brought together and overlapped to form a pair of loops. The two loops thus formed lie in planes which intersect each other at a point beyond the forward side of the antenna. At the opposite side of the loops, the two ends of the conductive member emerge to form terminals for connection to a transmission line. At this side of the antenna the loops are spaced farther apart than at the side where the folded dipole ends overlap. This construction results in a highly directional antenna capable of wide frequency band reception with a good match to a 300 ohm transmission line.

Abstract: An improved antenna system having a plurality of loop antennas surrounded coaxial shields which have dual electrostatic shield gaps therein. A shunt capacitance is placed across each of the shield gaps. The shunt capacitances are matched and variable among discrete values. Variation of the capacitances provides increased antenna sensitivity without a change in physical dimensions of the antenna.

Abstract: A driven quad antenna unit includes four perpendicularly arranged antenna elements, each element containing therein a high Q load coil in order to reduce the overall size of the antenna structure. A similarly configured parasitic loop unit functioning as a director or reflector (or both may be employed) is located in front or behind, as the case may be, the driven antenna unit. As with the driven unit, each side of the parasitic unit has a coil connected therein, the number of turns in each coil of the director being somewhat less than in the number in the coils of the driven unit and somewhat greater in the coils of the reflector.

Abstract: A combined window or windshield and antenna for an automotive vehicle includes an antenna comprising a generally T-shaped conductor and a generally U-shaped conductor, the two conductors being connected together at a point intermediate the ends of the U-shaped conductor, the two limbs of the U-shaped conductor so defined being asymmetric with respect to each other, whereby the resulting antenna has reception characteristics more nearly independent of the orientation of the vehicle to the transmitter whose signals are being received.

Abstract: A miniaturized thin-wire multi-turn series-connected helical loop antenna, the volutes of which are concentric turns, closely spaced so as to exhibit strong mutual coupling effects. A lumped impedance, fixed or variable, is disposed electrically in series with one of the turns, and a selectively actuable multi-position switch interconnects the turns and the lumped impedance to maximize efficiency.BACKGROUND OF THE INVENTION1. Field of the InventionThe subject invention relates to miniaturized multi-turn series-connected loop antennas.2. Description of the Prior ArtThe theoretical solution for multi-turn loop antennas, whether transmitting or receiving, is initially based on the solution for a single-turn loop. The single-turn solution can be obtained by considering the antenna to be a transducer which converts concentrated or distributed voltages into distributed fields and vice-versa. The phenomenon which accomplishes this is the flow of current on the antenna conductor.