A communication apparatus for a vehicle according to an embodiment and a control method therefor are disclosed. The communication apparatus for a vehicle comprises: an antenna unit including a first antenna and a plurality of second antennas; a first switch for switching a first path to the first antenna and a second path to each of the plurality of second antennas; a second switch for switching a second path to any one of the plurality of second antennas; a length adjustment unit that is connected to the second path to the one second antenna connected to the second switch and adjusts the resonance length of the connected second antenna; and a communication control unit that generates a switching signal for connection to any one of the plurality of second antennas according to the state of the first antenna.

Disclosed is a system and method for reducing particulate pollutants in air, using pulsed electromagnetic waves. The disclosed system 200 comprises a device 215 configured for radiating radio waves, preferably in the frequency range of 800 MHz to 5 GHz in a predefined pulsed manner. Essentially, the disclosed device comprises a radiofrequency oscillator 315 configured for oscillating at the predefined frequency. The signal is then suitably power amplified with an RF amplifier 310 and using a suitable switch 235 the amplified output is routed to one of an omnidirectional antenna 240 and directional antenna 245 for radiating the pulsed radio waves to the atmosphere.

Disclosed is a system and method for reducing particulate pollutants in air, using pulsed electromagnetic waves. The disclosed system 200 comprises a device 215 configured for radiating radio waves, preferably in the frequency range of 800 MHz to 5 GHz in a predefined pulsed manner. Essentially, the disclosed device comprises a radiofrequency oscillator 315 configured for oscillating at the predefined frequency. The signal is then suitably power amplified with an RF amplifier 310 and using a suitable switch 235 the amplified output is routed to one of an omnidirectional antenna 240 and directional antenna 245 for radiating the pulsed radio waves to the atmosphere.

In one example, an antenna system is described. The antenna system includes a primary antenna on an aircraft. The primary antenna is mechanically steerable and has an asymmetric antenna beam pattern with a narrow beamwidth axis and a wide beamwidth axis at boresight. The antenna system also includes a secondary antenna on the aircraft, the secondary antenna including an array of antenna elements. The antenna system also includes an antenna selection system to control communication of a signal between the aircraft and a target satellite via the primary antenna and the secondary antenna. The antenna selection system switches communication of the signal from the primary antenna to the secondary antenna when a performance characteristic for communication with the target satellite satisfies a threshold due to a position of the aircraft relative to the target satellite.

In one example, an antenna system is described. The antenna system includes a primary antenna on an aircraft. The primary antenna is mechanically steerable and has an asymmetric antenna beam pattern with a narrow beamwidth axis and a wide beamwidth axis at boresight. The antenna system also includes a secondary antenna on the aircraft, the secondary antenna including an array of antenna elements. The antenna system also includes an antenna selection system to control communication of a signal between the aircraft and a target satellite via the primary antenna and the secondary antenna. The antenna selection system switches communication of the signal from the primary antenna to the secondary antenna when a performance characteristic for communication with the target satellite satisfies a threshold due to a position of the aircraft relative to the target satellite.

The present invention provides a radio frequency circuit and an electronic device. The radio frequency circuit includes a radio frequency transceiver having a first transmit port, a first radio frequency module connected to a first antenna array, a second radio frequency module connected to a second antenna array, and a first switch. A first input terminal of the first switch is connected to the first transmit port, and two output terminals of the first switch are respectively connected to the two radio frequency modules. In a case that the first switch is in a first state, the first transmit port is conductively connected to the first radio frequency module; or in a case that the first switch is in a second state, the first transmit port is conductively connected to the second radio frequency module.

A single-layer Wide Angle Impedance Matching (WAIM) and method for using the same are described. In one embodiment, the antenna comprises: an aperture having a plurality of antenna elements operable to radiating radio-frequency (RF) energy; and a single-layer wide angle impedance matching (WAIM) structure coupled to the aperture to provide impedance matching between the antenna aperture and free space.

An example apparatus includes a planar five bar linkage having a ground link and an endpoint. A feed horn is attached at or near the endpoint of the planar five bar linkage. A first motor is attached to a first side of the ground link to move the endpoint and a second motor attached to the second side of the ground link to move the endpoint.

The disclosure relates to radio engineering, and more specifically to a wide scanning patch antenna array. The technical result consists in extending the scanning range of the antenna array, increasing its efficiency and reducing losses. An antenna array is provided. The antenna array includes a printed circuit board on which at least two patch antennas are located, each having at least one feeding port, wherein, the patch antennas are rotated relative to each other around the normal in the center of symmetry of the patch antenna in such a way that the corresponding feeding ports of the patch antennas related to the same polarization are rotated by 180 degrees relative to each other, wherein the phases of the signals applied to said feeding ports rotated relative to each other, differ by 180 degrees plus a phase shift for scanning control, a dielectric radome located above the printed circuit board, and passive beamforming elements of the array elements, located on the radome above the patch antennas.

A vehicle antenna apparatus is provided. The vehicle antenna apparatus includes an array antenna including a plurality of antenna elements that output a plurality of beams identified by output directions, and a processor configured to perform at least one instruction. The processor is further configured to obtain speed information of a vehicle, select at least one beam from among the plurality of beams such that a shape of a beam pattern formed by the plurality of beams is changed based on the speed information, and control the array antenna to output the selected beam.