218 results about "Meander line" patented technology

A multiband antenna with removed coupling includes a radiator formed as a meander line bent zigzag several times and having a gap filling part in at least one area between neighboring meander lines. The gap filling part interconnects the neighboring meander lines. The multiband antenna further includes a ground connected with the radiator and at least one switch element mounted in an area along the longitudinal direction of the radiator and configured to alternately short or open an area of the radiator. Accordingly, two different resonance frequencies can be tuned using the single antenna, and the antenna efficiency can be enhanced by removing the coupling between the resonant frequencies that are tuned through the gap filling.

A meander line phased array antenna element is disclosed. The phased array antenna element has a dielectric plate, a transceiver medium component formed on the dielectric plate by a printed-circuit method and a microstrip line having a strip line for electrical connection with the transceiver medium component and a ground formed on the back of the dielectric plate. Since the phased array antenna element is planar, it can be mounted on any surface, such that the quality of the transmitted and/or received signal is able to be enhanced without any influence on the size of the product using this technique.

A single-feedpoint multiband monopole antenna is provided with independent radiator elements. The antenna comprises a microstrip counterpoise coupler having a single-feedpoint interface, a first radiator interface, and a second radiator interface. A first microstrip radiator, i.e. a meander line microstrip, has an end connected to the counterpoise coupler first radiator interface, and an unterminated end. A second microstrip radiator, i.e. a straight-line microstrip, has an end connected to the counterpoise coupler second radiator interface, and an unterminated end. The two radiators are capable of resonating at non-harmonically related frequencies. As with the two microstrip radiators, the microstrip counterpoise coupler is a conductive trace formed overlying a sheet of dielectric material. The counterpoise coupler can come in a variety of shapes, so that the overall antenna may take on a number of form factors.

A compact wideband dual polarized dipole antenna assembly using a meander line component. The antenna assembly includes a pair of open stub baluns with a radiating dual polarized top printed circuit board (PCB) that is perpendicular to the baluns. The radiating dual polarized top PCB includes the meander line component. The compact dipole solution, through the use of the meander line component, may be employed in more complex multi-band products resulting in a reduction in metal required and does not compromise in performance during multi-band operation. The compact wideband dual polarized dipole antenna assembly covers all known radio frequency bands in, for example, the mobile base station industry to date.

An open-ended two-strip meander line antenna, an RFID tag using the same and an antenna impedance matching method thereof are provided. The antenna includes: a radiating strip line for deciding a resonant frequency of the antenna; and a feeding strip line for providing a radio frequency (RF) signal to an element connected to the antenna, wherein ends of the radiating strip line and the feeding strip line are open.

Provided are a Planar Inverted-F Antenna (PIFA), a Radio Frequency Identification (RFID) tag using the PIFA. The present invention miniaturizes the antenna by using a meander line extended from a radiating edge of a radiation antenna and adjusting a resonant frequency of the antenna, and it performs impedance matching by adjusting capacitive reactance of the antenna. Also, it can perform impedance matching by using a stub having a slot formed therein and adjusting inductive reactance and capacitive reactance of the antenna. The present invention miniaturizes the antenna by using a plurality of shorting plates for shorting the radiation patch from a grounding surface and adjusting the resonant frequency of the antenna. The present invention also provides an inexpensive PIFA antenna with an excellent radiation efficiency by forming the radiation patch in the form of metal sheet in the antenna and floating the radiation patch in the air.

An antenna connected to a circuit portion and configured to effect transmission and reception of information by radio communication, the antenna including a driven meander line portion which has a feed section connected to the circuit portion and which is a line conductor formed in a meandering pattern, and a parasitic meander line portion which does not have a feed section connected to the circuit portion and which is a line conductor formed in a meandering pattern, the parasitic meander line portion being positioned relative to the driven meander line portion, so as to influence an input impedance of the driven meander line portion, wherein the driven and parasitic line portions have respective extensions of the line conductors formed at respective opposite longitudinal ends of the antenna. Also disclosed in a transponder in the form of a radio-frequency identification tag including the antenna and capable of radio communication with an interrogator.

Scanning apparatus which scans input radiation from a scene and output radiation is transmitted to a receiver system, for example a millimetre wave imaging camera or a radar receiver by a rotatable reflective plate having an axis of rotation passing through the centre of its surface, secondary reflector and static reflector, wherein the secondary reflector is a second rotatable reflective plate having a common axis of rotation with the first rotatable reflective plate, wherein the common axis of rotation is inclined at a non-zero zero angle thetab to the normal to the second reflective plate. The normal to the first rotatable plate is inclined at a small angle to the common axis of rotation, typically a few degrees and forms the secondary reflector. The static reflector may be a polarising roof reflector through which radiation is input to and output from the apparatus. The apparatus also includes a 45° Faraday rotator or a birefringent surface such as a Meander-line. An additional Faraday rotator and an inclined polariser may be included in the apparatus and arranged such that radiation output to the receiver system may be separated from the path of input radiation. Alternatively, the scanning apparatus may include a reflector lens arrangement, such that focused output radiation may be output directly to the receiver system.

The combination of a Vivaldi notch and a meander line loaded antenna for ultra wide bandwidth is provided with dual polarity by providing orthogonally oriented Vivaldi notched structures coupled to each other at the edges thereof. Mode selection is provided by selectively switching between linear and circular polarization modes through selective input coupling techniques. Each side of the dual polarity Vivaldi notch/MLA plates includes a bifurcated plate with one end of the bifurcated plate having exponentially curved Vivaldi notch surfaces ahead of a cavity opened at the rear end to the bifurcated notch. The side plates for the top plate structure are themselves Vivaldi notch structure, with their side plates being the ajoining top or bottom plate. In each case, internally carried meander lines connect the adjacent together.

The invention provides a high gain bidirectional end-fire antenna array applied to a mine and a tunnel, belonging to the antenna design field in wireless communication. A folded dipole with a bending line as a dipole arm is employed as an antenna unit which has a compact structure. An antenna unit medium plate employs an I shape structure, introduced discontinuity is reduced when a feed transmission line steps across the antenna unit, and reflection is reduced. A series connection feed form with combination of horizontal parallel double-line and vertical parallel double-line structures is used, reverse excitation and impedance match of adjacent units are realized, and high gain bidirectional end-fire radiation is obtained. The antenna array is suitable for realization of wireless communication in a typical non-free space transmission channel with limited space such as the mine and the tunnel, and the antenna array has the advantages of the compact antenna unit, a small windward area, low cost and a high gain.

An omni-directional shear horizontal (SH) guided wave electromagnetic ultrasonic transducer comprises an annular ferronickel belt with an opening, wherein the ferronickel belt is pre-magnetized through a permanent magnet or electromagnet, a meandered line coil is adhered to one surface of the ferronickel belt, and the end portion of the meandered line coil is located at the position of the opening of the ferronickel belt. Each lead wire in the meandered line coil is a single-turn lead wire or a 2-4-split split type lead wire. The radial distance between centers of adjacent lead wires in the meandered line coil is d, and d=lambada/2, wherein lambada is the wavelength of the SH guided wave mode which is used at the current frequency f. The omni-directional SH guided wave electromagnetic ultrasonic transducer is applicable to defect detecting and health monitoring of various uniform and isotropic elastic plate structures including conducting materials and non-conducting materials.

The invention relates to a frequency selective surface structure with wide passband and ultra-wide stopband. The frequency selective surface structure comprises a fine square ring array layer, a spiral meander line array layer and a thick square ring array layer, wherein the fine square ring array layer is etched on an upper surface inner side dielectric plate, the spiral meander line array layer is etched on an intermediate metal layer lower side dielectric plate, the thick square ring array layer is etched on a lower surface outer side dielectric plate, an upper side foam material interlayer is further arranged between the upper surface inner side dielectric plate and the intermediate metal layer lower side dielectric plate, and a lower side foam material interlayer is further arranged between the intermediate metal layer lower side dielectric plate and the lower surface outer side dielectric plate. The frequency selective surface structure has the advantages of small unit size, small thickness, low transmission loss, wide passband, good out-of-band rejection, further has the beneficial effects of ultra-wide stopband, wide electromagnetic wave scanning angular domain and stable scanning along azimuth angle of frequency response, and can be widely applied to antenna housing design in platforms such as radars, satellite communication and aircrafts.