Abstract: Twin electric microstrip dipole antennas consisting of thin electrically ducting rectangular shape elements formed on both sides of a dielectric substrate. In these antennas the element on one side of the substrate is the mirror image of the element on the other side of the substrate. Each of the elements act, in effect, as a ground plane for the other. The thickness of the substrate to a large extent determines the bandwidth of the antenna and the length of the conducting elements on both sides of the substrate determines the resonant frequency.

Abstract: Twin electric microstrip dipole antennas consisting of thin electrically ducting rectangular shape elements formed on both sides of a dielectric substrate. In these antennas the element on one side of the substrate is the mirror image of the element on the other side of the substrate. Each of the elements act, in effect, as a ground plane for the other. The thickness of the substrate to a large extent determines the bandwidth of the antenna and the length of the conducting elements on both sides of the substrate determines the resonant frequency.

Abstract: The present invention is an electrical filter which includes coaxial resonators, for example, both-end open type 1/2 wave length TEM (transverse electro-magnetic mode) coaxial resonators, each having dielectric material, for example of titanium oxide group, filling the space between an inner conductor and an outer conductor of the resonator for reduction of size and weight of the resonator with optimum quality factor Q and temperature characteristics, while the predetermined number of these coaxial resonators are accommodated in one or more than two bores longitudinally formed in parallel relation to each other in a filter casing of conductive material for coupling the resonators to each other through capacitors.

Abstract: Twin electric microstrip dipole antennas consisting of thin electrically ducting rectangular shape elements formed on both sides of a dielectric substrate. In these antennas the element on one side of the substrate is the mirror image of the element on the other side of the substrate. Each of the elements act, in effect as a ground plane for the other. The thickness of the substrate to a large extent determines the bandwidth of the antenna and the length of the conducting elements on both sides of the substrate determines the resonant frequency.

Abstract: An antenna includes a disk of dielectric material with a number of radiator elements and signal processing circuits. The radiator elements are arranged mirror-symmetrically with respect to two perpendicular axis and are divided into a number of sectors. When the antenna is a receiver a first part of the signal processing circuits is arranged in a first layer of the disk for combining signals emitted by the elements of any sector while a. A second part of the signal processing circuits is arranged in a second layer of the disk for combining signals coming from sectors similarly located with respect to the axes to groups of signals, each group of signals having at least one signal of generated sum signals and difference signals with respect to the two axes. A third and last part of the signal processing circuits is arranged in a third layer of the disk for combining in the groups of signals included sum signals and difference signals and for emitting the combined signals to the output terminals of the antenna.

Abstract: The configuration consists of two antennae on the same mast. The upper anna is a ground plane capable of two frequency bands of operation. The lower antenna comprises a sleeve and radial elements.The upper antenna consists of four radials 36" long and an upper element. The two bands of operation covered by the upper antenna are 80 MHz and 150 MHz. Band selection is accomplished by selection of the correct upper mast element. This element is removable. A 34" long element is used for 80 MHz operation and a 14" long element for 150 MHz operation. This antenna is nondirectional and is used for transmitting.The lower antenna consists of four radials 22" long and an upper and lower sleeve. The radials are insulated from the mast and connected to the center conductor of the coax. The upper sleeve is a portion of this antenna and also isolates the antenna from the mast. The only use of the lower sleeve is to provide isolation of the antenna from the mast and coaxial cable.

Abstract: A parallel plate geodesic lens aerial in the shape of a spherical cap or a flat disc, generates scanned planar radio beams. Commutated input signals to the lens are fed via output probes located around an arc of the perimeter of the lens to an arcuate array of radiating elements. The positional relationship between the power output from the lens and the power input to the array is 1:k, where k .noteq. 1. Dielectric-filled geodesic lenses, power level and scanned beam accuracy monitoring, and complex modulation of the input power to enable simpler aerials to be realized, are described.

Abstract: A three band monopole antenna with such length as to be of greater electrical length than a quarter wavelength of the two highest frequency bands and shorter than a quarter wavelength of the lowest frequency band. The antenna system includes a matching network at its base matching the antenna on three frequency bands related by, substantially, the progression 1, 2, 4, and with the matching network including a shunt inductor and an inductor and capacitor in series with the signal feedpoint.

Abstract: A pendulum antenna for a microwave landing system is disclosed. The antenna is an elevation scanning antenna of the phased array type. The aperture, phase shifters, drivers and power distribution manifolds form a column-like structure. The column is suspended like a pendulum inside a fiberglass radome and windshield. The column has a degree of freedom limited by stops, damping means, and lock member. The stops set the allowable pitch angle, the damping means prevents the antenna from swinging back and forth from wind gust effects, and the lock member is used to constrain the antenna during transportation. The radome is freely mounted in a base support having adjustable legs for antenna leveling.

Abstract: A microwave band-pass filter has a casing, at least one dielectric resonator in the casing and at least one metallic adjusting screw supported by a wall of the casing and positioned adjacent the dielectric resonator with the tip end of the screw closely adjacent the resonator, so as to improve the sensitivity characteristics of the filter especially in the region higher than the resonance frequency.

Abstract: The invention concerns stabilized platform arrangements of the kind utilized, for example, to carry a rotatable ship's radio antenna, which requires to be stabilized against pitch and roll. A control system is provided which includes means for relating error signals representative of deviations in pitch and roll to orthogonal axes fixed with respect to the antenna, by conversion to angular errors in two orthogonal planes, the elevation and cross elevation planes, containing the reference axis about which the antenna rotates.

Abstract: An array of spiral antennas formed conformally about a cylindrical surface. The antennas share a common cavity or resonance chamber of annular cross section inside the cylinder.

Abstract: A dielectric resonator is made up of a block of dielectric material and a synthetic resin bonded onto the dielectric material for precisely adjusting the required resonance frequency of the resonator. The resonance frequency is reduced by an increase of the amount of synthetic resin and the resonance frequency is increased by a decrease of the mass of synthetic resin.

Abstract: This relates to dual band waveguide radiating element for an antenna. A pair of adjacent rear wall excited waveguide elements have a slot in the common wall between them. This slot contains an excitation element so that the structure operates as a ridge waveguide. The rear wall excitation is at the higher of the two frequencies, e.g. S band, while the ridge waveguide operates at the lower frequency, e.g. L band.

Abstract: A vehicle-mounted antenna simultaneously coupled via a passive electrical network to a 40-channel Citizens band transceiver and to an AM-FM receiver is disclosed. A non-loaded whip antenna, sized to be electrically short at Citizens band frequencies, is cowl-mounted in a conventional manner to present the dimensions and generaly appearance of a standard broadcast band car radio antenna. The passive electrical coupling network includes a broadband compensated, quarter-wave transmission line transformer for impedance matching the electrically short antenna to the Citizens band transceiver, and associated L-C circuits for selectively blocking, bypassing and separating AM and FM band signals relative to each other and to Citizens band signals. The disclosed antenna with its associated network provides excellent AM-FM radio receiver reception while presenting to the Citizens band transceiver a voltage standing wave ratio of 1.5:1 or better.

Abstract: An antenna for a hand-held radio transceiver includes first and second elements extending from the radio's case. The first element is comprised of a pair of series coupled members having electrical lengths of one-half and one-quarter wavelength, respectively, with the free end of the second member being coupled to the transmitter output. The second element couples to the radio's electrical ground and is configured to form a transmission line with the second member. The effective electrical length of the second element, including the influence of the elements parasitic coupling to the radio, is adjusted to be one-quarter wavelength.The resulting antenna structure minimizes surface currents across the radio's body, thereby substantially eliminating power loss caused by absorption in the user's body.

Abstract: A dual mode filter, known in the art as a fourth order filter, has cylindrical coaxial input and output cavities that are connected through a coupling obstacle. The output of the dual mode filter is provided via a connector that carries a probe which extends within the end cavity. The input cavity supports a propagation therethrough of signals within a pass band of frequencies and within a parasitic band of frequencies. The diameter of the end cavity is smaller than the diameter of the input cavity, thereby causing the end cavity to suppress signals within the parasitic band.

Abstract: A device comprising a band-pass filter comprising two concentrically arranged coaxial resonator cavities and a coupling capacitor disposed between these resonator cavities, wherein the bandwidth of the filter can be changed by means of a replaceable dielectric body disposed between the plates since the device is separable in two individually associated parts.

Abstract: A microstrip antenna wherein a cavity or channel is formed in the ground plane conductor to reduce radiation losses and cross-coupling between elements. A shielded embodiment is also disclosed.

Abstract: A transponder includes twelve directional filters that operate in both band stop and band pass modes. The pass and stop bands of each filter has a center frequency that is substantially the same as the center frequency of one of twelve signal channels of the transponder, whereby each channel corresponds to a filter. The twelve filters are connected to a rectangular waveguide at selected relative displacements from a downstream end thereof. Signals within one of two groups of six alternate adjacent channels are propagated through their corresponding filters and through the downstream end without either an undesired signal loss or an undesired group delay. Signals within five channels of the other group are propagated through their corresponding filters and through the downstream end with a symmetrical loss of the highest and lowest frequency portions thereof.