Abstract: An apparatus for adjusting an inclination angle of an antenna using a rotatory power is disclosed, wherein a remote control unit is easily combined with the apparatus. The apparatus in an antenna having a phase shifter includes a power delivering member connected to the phase shifter, and a driving member combined with the power delivering member, and for providing a power to the power delivering member. Here, an inserting section is formed at a part of outside surfaces of the driving member, a remote control unit is inserted into the inserting section and rotates the driving member, and the power delivering member rotates in response to the power provided from the driving member. Accordingly, any given member is not removed when the remote control unit is combined with the apparatus. As a result, the remote control unit may be easily combined with the apparatus, and any member is not lost.

Abstract: A rotatable reflector antenna system that supports on-the-move communications to and from a mobile land, airborne, or maritime vehicle with a remote communication device, such as a geostationary satellite. The antenna system can include a pillbox antenna, a line feed antenna, or an array of horn antennas that convey electromagnetic waves between a transceiver (transmitter and/or receiver) and a reflector. The reflector may be embodied as a singly curved, parabolic cylinder reflector coupled to support members in a manner that enables the reflector to rotate with respect to the antenna. The reflector can rotate in a first direction, such as an elevation rotation, and the entire antenna system including the reflector can be mounted to a turntable or other rotatable platform that rotates in a second direction, such as an azimuth rotation.

Abstract: The present invention relates to a device for adjusting the beam direction of a beam radiated from a stationary array of antenna elements. Antenna element feed points are coupled to a common source via a feed line structure having a source connection and feed connection terminals to be connected to the antenna element feed points, the feed line structure being at a distance from and in parallel to a fixed ground plane. A movable element is located adjacent to the feed line structure to change the signal phase of signal components being transferred between the source connection and the respective feed connection terminals. The movable element is movable for effecting a phase shift of the signal components to adjust the beam direction. The device is provided with a detection arrangement for detecting the absolute position of the movable element.

Abstract: Provided is a antenna system for tracking a mobile satellite and a movable carrier having the same for mechanically adjusting the orientation of an antenna at the azimuth angle and the elevation angle and correcting the phase error of a receiving signal while adjusting the elevation angle of the antenna at the same time. The antenna system for tracking a mobile satellite includes: a substrate; a rotating plate rotatably disposed on the substrate; one or more antennas disposed at the rotating plate; an azimuth angle adjusting unit for mechanically adjusting an azimuth angle of the antenna; and an elevation angle adjusting unit for mechanically adjusting an elevation angle of the antenna.

Abstract: A portable satellite tracking antenna utilizes a tiltable reflector surface, and a parabolic reflector surface to direct a satellite signal to a feed horn. A fixed flat reflector surface is utilized in conjunction with the parabolic reflector surface to increase the strength of a signal that is transmitted from the parabolic reflector surface to the feed horn. In one preferred embodiment the parabolic reflector surface is fixed, and the feed horn and tiltable reflector surface are rotatable to selected azimuth settings. The cant of the tiltable reflector surface is adjusted by pivoting the tiltable reflector surface.

Abstract: A low power, lightweight, collapsible and rugged antenna positioner for use in communicating with geostationary, geosynchronous and low earth orbit satellite. By collapsing, invention may be easily carried or shipped in a compact container. May be used in remote locations with simple or automated setup and orientation. Azimuth is adjusted by rotating an antenna in relation to a positioner base and elevation is adjusted by rotating an elevation motor coupled with the antenna. Manual orientation of antenna for linear polarized satellites yields lower weight and power usage. Updates ephemeris or TLE data via satellite. Algorithms used for search including Clarke Belt fallback, transponder/beacon searching switch, azimuth priority searching and tracking including uneven re-peak scheduling yield lower power usage. Orientation aid via user interface allows for smaller azimuth motor, simplifies wiring and lowers weight. Tilt compensation, bump detection and failure contingency provide robustness.

Abstract: Provided is an apparatus and method for estimating sensor signals to stabilize a posture of a mobile satellite tracking antenna.

Abstract: An apparatus for positioning and controlling a spherical, inflatable antenna includes a driven rotating table disposed in the horizontal plane which supports and drives a horizontal arm member to which is hingedly connected first and second upright support members at either end. The upright support members include journal bearings attachable to the surface of an inflatable antenna.

Abstract: An assembly that has a rotator element, a sensor element coupled to the rotator element or assembly, and a controller element provides azimuth antenna control. The rotator element has a worm gear driven slewing ring having a through hole through which a feed line to an antenna may be inserted to accommodate continuous rotation of greater than 360 degrees or partial rotation in either direction of the antenna coupled to the rotator element. The controller element is coupled to the rotator element and to the sensor element, and the controller element receives feedback information concerning a current azimuth position of the antenna from the sensor element to control the rotator element to rotate to a future azimuth position of the antenna in accordance with a selected azimuth function and the feedback information provided by the sensor element.

Abstract: The present invention provides a method for controllably moving a plurality of antennae in a wireless communications system. The method comprises activating a first and second actuator associated with a first and second one of the plurality of antennae to move the first and second antennae to a desired position. The power delivered to the first and second actuators is measured, and at least one parameter of at least one of the first and second actuators is reduced in response to the measured power being greater than a setpoint.

Abstract: An apparatus for positioning and controlling a spherical, inflatable antenna includes a driven rotating table disposed in the horizontal plane which supports and drives a horizontal arm member to which is hingedly connected first and second upright support members at either end. The upright support members include journal bearings attachable to the surface of an inflatable antenna.

Abstract: An antenna pointing control apparatus and method that reduce a pointing error of an antenna having a two-axis gimbal structure. An antenna installed on a ship hull is controlled to point toward a satellite by an antenna pointing control apparatus having a two-axis mechanism. Movement of the ship hull are recognized every prescribed cycle time, a satellite bearing is measured, and a pointing error of a directional antenna with respect to a satellite is detected. If it is determined that the satellite will not pass within a prescribed region A about an extension line of an azimuth angle (AZ) axis of the ship's hull, then a two-axis control is executed. However, if the satellite will pass within the prescribed region A, then a virtual three-axis control is executed.

Abstract: A satellite ready building comprises a plurality of studs and satellite wires positioned adjacent to the studs having a first termination and a second termination. A connector is coupled to the second termination of the wires. The first termination is coupled through the roof or the siding of the building. Drywall is installed in the house after the wires are installed. The first termination may be installed in a radome positioned on the roof of the building.

Abstract: The present invention relates to an antenna system mounted on a mobile vehicle. In the present invention, a power distributor and a part of a high-frequency module that includes a frequency converter are placed in an external fixed unit that is placed outside a radome. In addition, an active cooler/cooling fin, a heater, and an air circulation fan are placed at an internal bottom plane of the antenna system, and a cooling fin and cooling fan are placed at an external bottom plane of the antenna system.

Abstract: An apparatus includes an azimuth adjuster coupled between a motor and a directional antenna. Motor rotation causes the azimuth adjuster to rotate the antenna about an azimuthal axis. The motor rotation also causes an elevation adjuster to rotate, which causes a screw mechanism to modify an elevation angle by pivoting the antenna about an elevational axis. To aim the directional antenna, a body-direction vector of a movable body with the antenna attached thereto is determined. Based on an elevational relationship between the body-direction vector and a satellite-direction vector, the elevation adjuster modifies the elevation angle of the antenna by rotating the motor to achieve full-turn amounts to pivot the antenna. The azimuth adjuster modifies an azimuth angle of the antenna based on an azimuthal relationship between the body-direction vector and the satellite-direction vector by rotating the motor to achieve partial-turn amounts of the antenna.

Abstract: The device permits remote actuation on the slope angle of an antenna consisting of two units, one electric and one mechanical, physically separated and connected forming a single arrangement, in which each of the units is provided with its own casing. The mechanical unit supports an electromotor coil positioning sensors, a driving gear, and a gear wheel engaged with the pinion. The electronic unit is provided with supply and communication connection terminals, an electronic circuit, a sensor for reading initial reference positioning and a casing. Both are connected by means of a cable and connector. Due to the independent manner in which the mechanical and electrical units are arranged, it is possible to obtain a watertight electronic unit protected from damp, independent replacement in a simple manner of both units, and the visualization of the indicator rod's position and movement.

Abstract: An antenna system for receiving radio waves and for operation in conjunction with a remote controller that transmits control data including gain state data. The antenna system includes an antenna that receives the radio waves and outputs a radio frequency signal and a radio frequency amplifier coupled to receive and amplify the radio frequency signal to a gain level controlled through a gain control input. A remote control receiver receives the control data and a controller is coupled to the gain control input and the remote control receiver. The controller couples the gain state data to the gain control input, thereby remotely controlling the gain level of the radio frequency amplifier. A remotely controlled antenna rotor is also taught.

Abstract: A unitized device and method to optimize directional antenna alignment for long-distance communications using the low-cost IEEE 802.11 (and related) compatible RF-chipsets (originally designed for short range Wireless-LAN and Wireless-PAN networks). The device combines these chipsets, along with a microprocessor, software, electronics to drive a directional antenna, and the motors and gearing necessary to physically move a directional antenna, into a unitized low weight, and low cost assembly designed to enable reliable digital radio links of many miles or more to be established with minimal costs, time, and installer skill. In one embodiment, the software methods incorporated into the software of this unitized device can include methods necessary to automatically or semi-automatically configure and align the directional antenna to one or more distant target sources. Various mechanical designs, as well as various software and electronics methods, are also disclosed.

Abstract: RET antenna with motor and clutch assembly that is operative to mechanically disengage the DC motor and drive unit (also called the gear-motor unit) from the phase shifter adjustment shaft during a manual tilt operation. Disengaging the gear-motor unit removes the drag of the motor and the high gear ratio gear box from the phase shifter control rod making it easier to manually turn the phase shifter control knob. In addition, the clutch disengages the gear-motor without disengaging the position detector from the phase shifter control rod so that position calibration is not lost during manual tilt adjustment. When the manual tilt operation is completed, the mechanical tilt clutch enables the gear-motor unit to be reliably re-engaged with the phase shifter control rod for motorized electrical tilt operation without having to re-calibrate the position detector.

Abstract: RET antenna with a modular switching unit and a multi-device control unit con figured to be inserted into and removed from a receptacle in the antenna. The multi-device control unit works together with motors and position sensors located inside the antenna to allow a single controller located in the multi-device control unit to control multiple embedded electro-mechanical actuators, such as phase shifter control motors. The multi-device control unit includes lightning protection circuits, communications circuits, a motor controller, power control circuits and a motor position sensing circuit inside a small housing. These components are shared between all motors inside the antenna through the modular switching unit, which allows a single set of components within the multi-device control unit to replace redundant components deployed in prior RET antennas.

Abstract: A low profile receiving and/or transmitting antenna includes an array of antenna elements that collect and coherently combine millimeter wave or other radiation. The antenna elements are physically configured so that radiation at a predetermined wavelength band impinging on the antenna at a particular angle of incidence is collected by the elements and collected in-phase. Two or more mechanical rotators may be disposed to alter the angle of incidence of incoming or outgoing radiation to match the particular angle of incidence.

Abstract: An apparatus for positioning and controlling a spherical, inflatable antenna includes a driven rotating table disposed in the horizontal plane which supports and drives a horizontal arm member to which is hingedly connected first and second upright support members at either end. The upright support members include journal bearings attachable to the surface of an inflatable antenna.

Abstract: A lift actuator for supporting a radar antenna array and for selectively moving the antenna array between a retracted position and an erected operational position, said actuator includes a first linear induction driver movable along a first member and a second linear induction driver movable along a second member. The first and second members each have a distal and a proximal ends. The second member is pivotably connected at said proximal end to the first driver. A third rigid member is connected to the second driver. The third member has a distal end adapted to pivotably connect to a radar antenna array. The radar antenna array is constrained in the direction of the first member.

Abstract: Disclosed is a system and method for determining the far-field radiation pattern of an antenna within a composite radiator. The method involves performing a near-field scan at an angular sample spacing corresponding to a minimum sphere centered at the crossing of two rotational axes encompassing the composite radiator, computing coefficients based on the near-field scan, adding a phase adjustment to the far field based on a translation from the scan origin to a point within the antenna, re-computing the coefficients, and truncating the re-computed coefficients, thereby retaining a number of coefficients corresponding to the diameter of a minimum sphere encompassing the antenna only. In doing so, the far-field radiation pattern of the antenna may be determined from the truncated set of coefficients with interference effects of the composite radiator substantially mitigated.

Abstract: A satellite-based communications system operating at high data rates includes a plurality of satellites each having uplink and downlink antennas for transmitting and receiving a plurality of signals utilizing a plurality of spot beams to and from a plurality of coverage areas at a predetermined range of frequencies. The system also includes a plurality of user terminals for transmitting and receiving signals to and from the plurality of communications satellites at the predetermined range of frequencies and at one of the first plurality of data rates. Each of the user terminals having a steerable antenna for tracking relative movement of each of the user terminals with respect to each of the plurality of communications satellites and for tracking movement of each of the plurality of communications satellites in order to maintain communications with the plurality of communications satellites.

Abstract: A radar system having first and second modes of operation comprising a dual antenna assembly comprising first and second antennas having respective first and second antenna waveguides coupled to a waveguide switch operable to divert RF energy to or from either said antenna waveguide, said waveguide switch coupled to a common waveguide, said dual antenna assembly mounted to an antenna support assembly, said first and second antennas being designed for use in said first and second modes respectively and operable for coupling said RF energy to a transmit medium, and for coupling reflected RF energy from transmit medium to said first or second antenna waveguide; and a control processor configured with control logic operable to control the functions of said radar system wherein said first and second antennas are mounted generally perpendicularly in the vertical plane with respect to each other and wherein said radar system operates in only one of said modes of operation at any time.

Abstract: According to the invention, a system for adjusting the polarity of an antenna is disclosed. The system may include a spherical structure, at least one arm, and a coupling apparatus. The spherical structure may be at least partially spherical in shape about a central point and may include a first plurality of magnets. The at least one arm may be in proximity to the spherical structure, may include a second plurality of magnets, and may be coupled with the antenna. The coupling apparatus may be fixedly coupled with the antenna and rotatably coupled with the at least one arm. The coupling apparatus may include a third plurality of magnets, where at least a portion of the magnets may be configured to be selectively activated to rotate the coupling apparatus relative to the at least one arm.

Abstract: A vehicle-mounted communication antenna to be mounted on a vehicle for performing communication by an electromagnetic wave, includes an antenna body having an antenna case and an antenna element contained in the antenna case, and an antenna cover for protecting the antenna body that can transmit the electromagnetic wave.

Abstract: An enclosed satellite antenna system can include a generally rigid enclosure defining a volume that is configured to enable both manual transportability of the satellite antenna system and automated operation of the satellite antenna system without a substantial change in the volume of the enclosure or manual repositioning of the satellite antenna system. The enclosure can have disposed therein a satellite dish, a feedhorn configured to collect incoming signals concentrated by the satellite dish, and a low noise block converter configured to receive incoming signals from the feedhorn, amplify and convert the incoming signals to received signals, and transmit the received signals to at least one receiver. A motorized elevation dravie system can be configured to selectively adjust an elevation of the satellite dish and a motorized azimuth drive system can be configured to selectively rotate the satellite dish.

Abstract: A radar system having first and second modes of operation comprising a dual antenna assembly comprising first and second antennas having respective first and second antenna waveguides coupled to a waveguide switch operable to divert RF energy to or from either said antenna waveguide, said waveguide switch coupled to a common waveguide, said dual antenna assembly mounted to an antenna support assembly, said first and second antennas being designed for use in said first and second modes respectively and operable for coupling said RF energy to a transmit medium, and for coupling reflected RF energy from transmit medium to said first or second antenna waveguide; and a control processor configured with control logic operable to control the functions of said radar system wherein said first and second antennas are mounted generally perpendicularly in the vertical plane with respect to each other and wherein said radar system operates in only one of said modes of operation at any time.

Abstract: Provided are a pedestal apparatus and a satellite-tracking antenna having the same. The pedestal apparatus includes: a fixing unit fixed at a moving object; a connecter for forming a first rotating axis vertically to the fixing unit; a first rotation supporter having a bottom fixed at the fixing unit and a Y-shaped top for rotating the tracking antenna around the first rotating axis; a second connecter connected to ends of the Y-shaped top for forming a second rotating axis; a second rotation supporter having both ends connected to the both ends of the second connecter for rotating the tracking antenna around the second rotating axis; a third connecter for forming a third rotating axis at a center of the second rotation supporter; and a supporter connected to the third connecter in a predetermined shape for supporting the tracking antenna, wherein the first, second and third rotating axes are not crossed one another.

Abstract: Dual reflector offset mechanical pointing low profile telecommunication antenna, to be used above all on vehicles, even high-speed ones. Its reduced physical dimensions facilitate its use, with respect to the known solutions, as it allows its connecting to the receiving system, such as a satellite, though installed on a train or on an aircraft. The invention lies within the technical field of telecommunications and the applicative field of stationary, movable antennas of reduced dimensions, and accordingly within that of telecommunications in general. The original dual reflector antenna is obtained from a second-order polynomial that configurates it in the Cartesian space XYZ.

Abstract: There is provided a cellular antenna allowing mechanical azimuth adjustment in combination with adjustment of one or more other antenna attribute such as electrical down tilt, electrical beam width or electrical azimuth adjustment. An integrated control arrangement is provided which can utilise either serial, wireless or RF feed lines to convey communications. A multiband embodiment provides azimuth adjustment for both bands by utilising mechanical and electrical azimuth adjustment. Systems incorporating such antennas and methods of controlling them are also provided.

Abstract: According to the invention, a system for rotating a parabolic antenna about a central point is disclosed. The system may include a support member, a spherical structure, and at least one arm. The support member may be coupled with a surface and may also be coupled with the support member. The spherical structure may be at least partially spherical in shape about the central point. The spherical structure may include a first plurality of magnets. The at least one arm may be in proximity to the spherical structure and may also include a second plurality of magnets. The at least one arm may be coupled with the parabolic antenna, and at least a portion of the magnets in either one of, or both of, the first plurality of magnets and the second plurality of magnets may be configured to be selectively activated to rotate the arms about the central point.

Abstract: An antenna beam controlling system (ABCS) for use in cellular communication systems. The ABCS allows the antenna's horizontal beam direction and horizontal beam width to be remotely adjusted for optimum reception and transmission. The ABCS, in its basic design, is comprised of at least one antenna reflector that incorporates a reflecting disk for receiving and transmitting RF signals, an antenna rotating assembly, and an electronic controller. All the elements of the ABCS are housed within an antenna enclosure, such as a radome, which is maintained in an environmentally shielded condition by a top and bottom cover. The electronic controller is designed to remotely activate the ABCS and to control and optimize the position of the antenna reflector.

Abstract: To construct a reverberation chamber, a chamber provided with reflecting walls contains an antenna and a field stirrer which are placed opposite an object to be tested. By modifying an orientation of a main direction of irradiation from the antenna, a very large number of cavity modes are created inside the chamber, achieving the required variety of possible impingements on the object to be tested, such that the test carried out is as conclusive as possible and the least dependent possible on the dimensions and characteristics of the chamber.

Abstract: A low profile receiving and/or transmitting antenna includes an array of antenna elements that collect and coherently combine millimeter wave or other radiation. The antenna elements are physically configured so that radiation at a predetermined wavelength band impinging on the antenna at a particular angle of incidence is collected by the elements and collected in-phase. Two or more mechanical rotators may be disposed to alter the angle of incidence of incoming or outgoing radiation to match the particular angle of incidence.

Abstract: A bracket for releasably mounting an enclosed mobile/transportable motorized antenna system on a vehicle may include a support arm and a mounting assembly. The support arm can include a first end portion configured to secure to a vertically extending member of a vehicle and a second end portion configured to secure a mounting plate assembly. The mounting assembly can be secured to the second end portion of the support arm. The mounting assembly may comprise a generally planar mounting plate having a plurality of apertures defined therein. The apertures may be located within the periphery of the mounting plate and have a size and shape configured to secure a motorized antenna enclosure disposed on the mounting plate assembly. A releasably mountable enclosed mobile/transportable motorized antenna system on a vehicle may include an enclosed mobile/transportable motorized antenna system and a corresponding mounting bracket.

Abstract: An enclosed satellite antenna system can include a generally rigid enclosure defining a volume that is configured to enable both manual transportability of the satellite antenna system and automated operation of the satellite antenna system without a substantial change in the volume of the enclosure or manual repositioning of the satellite antenna system. The enclosure can have disposed therein a satellite dish, a feedhorn configured to collect incoming signals concentrated by the satellite dish, and a low noise block converter configured to receive incoming signals from the feedhorn, amplify and convert the incoming signals to received signals, and transmit the received signals to at least one receiver. A motorized elevation dravie system can be configured to selectively adjust an elevation of the satellite dish and a motorized azimuth drive system can be configured to selectively rotate the satellite dish.

Abstract: Plural panelized phased arrays, possibly including electronic tilt, are controlled in physical orientation to present a reduced physical profile. Each panel may include a non-linear shaped aperture which physically mates with other shaped apertures to maintain a composite tapered aperture for reduced side lobes. Long delay compensation to equalize RF radiator element signal propagation times improves bandwidth.

Abstract: An antenna steering mount includes two basic building blocks which are joined together to form any of the known steering-axis combinations. Each block includes a cylinder cut at an angle to form a cylindrical wedge. The wedges are joined together by bearings at their interface, and motors are used to counter rotate the two wedges relative to each other. One end of the complete assembly is attached to a mounting platform, and the other end includes mounting features for attaching an antenna dish thereto. Various two- and three-axis steering configurations are disclosed including combinations of azimuth, elevation, cross-elevation, and cross-level steering.

Abstract: A satellite tracking mode-selectable satellite antenna system is disclosed. In one embodiment, the satellite antenna system includes an antenna unit installed in a mobile body for receiving a satellite signal, a motor unit for rotating an oriented direction of the antenna unit, an outdoor unit (ODU) for driving the motor unit to orient the antenna unit toward a satellite, and an indoor unit (IDU) for controlling the ODU to orient the antenna unit toward the satellite. The satellite antenna system further includes a gyro sensor unit detachably installed in the mobile body for sensing motion of the mobile body. One embodiment of the invention is capable of selecting an in-motion mode of tracking and acquiring the initial position of a satellite and then continuously tracking the position of the satellite, or a positioner mode of tracking and acquiring the initial position of the satellite and then fixing the oriented direction of an antenna.

Abstract: Apparatus for the rotation of a large body, such as the base frame of a solar energy collector having a large reflective dish, about an axis utilizes a ring member or arcuate member. An actuator clamp is movable along the ring or arcuate member when it is not clamped to it. The actuator clamp is connected to one end of an expansion and contraction device, such as a hydraulic ram. The other end of the hydraulic ram is connected to the body, to a projection from the body, or to a rigid arm that is securely connected to the body. With the actuator clamp firmly clamped to the ring or arcuate member, actuation of the hydraulic ram causes the body to rotate about the axis.

Abstract: An antenna system is disclosed that includes a base section to which a signal connector may be attached, and a radiating section distal from said base section. The radiating section includes a flexible electrically conductive material and an adjustment system for changing a length of the electrically conductive material responsive to a control signal.

Abstract: In a mirror device with an antenna of the present invention the antenna is placed in a mirror housing where a mirror configured to reflect a rear of a vehicle is attached, a grounding portion at least part of which is composed of a conductive material is provided in the mirror housing, and the antenna is electrically connected to the conductive material of the grounding portion.

Abstract: Various methods and systems directed to electromagnetic signal proximity detection are disclosed. For example, an EM detector may include an antenna array for sensing electromagnetic radiation produced by a source of radio-frequency electromagnetic radiation, one or more amplitude demodulation circuits coupled to the antenna array configured to perform an amplitude demodulation of one or more signals provided by the antenna array to produce one or more respective demodulated output signals, and an analysis circuit coupled to the amplitude demodulation circuit configured to determine at least one relative characteristic between the antenna array and the source of radio-frequency electromagnetic radiation. The relative characteristic may be the relative distance and/or angle between the antenna array and the source of radio-frequency electromagnetic radiation. The embodiments allow for signal source detection and location determination without knowledge of the frequency of a target emitter.

Abstract: An antenna array employing a combined azimuth and elevation beam angle adjustment electromechanical system is disclosed. The system employs a dual purpose remotely controllable actuator. The actuator is used to adjust azimuth angle of the antenna array and radiation beam tilt of the same. An antenna array employing a combined azimuth, beamwidth and elevation beam angle adjustment electromechanical system is also disclosed.

Abstract: A multi-satellite access antenna system is disclosed. The multi-satellite access antenna system includes: a subarray antenna having two types of radiation means having different electric characteristics arranged on both sides of the subarray antenna and an active module interposed between the radiation means for amplifying a signal inputted at the radiation means and controlling a phase.

Abstract: The present invention relates to a method for satellite tracking by use of an antenna assembly having a master antenna for receiving and transmitting signals to and from a master antenna satellite in a first frequency band, and a slave antenna for receiving signals from a slave antenna satellite in a second satellite band, where the master and slave antennas have physical bore-sight axes which can be arranged at different directions in relation to each other. The method of the invention includes a master antenna search routine and a slave antenna search routine. The master antenna search routine comprises the steps of changing or switching a direction of reception of the master antenna, monitoring, during the changing or switching of direction of reception of the master antenna.

Abstract: According to an antenna device of the invention, an antenna frame is formed in a tank having an opening and filled with a medium, and a plurality of antennas are mounted to the antenna frame and vertically extend such that they surround a target of diagnosis. One of the antennas includes a transmitting module that radiates microwave signals and the other antennas include receiving modules that receive the radiated microwave signals.