221 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 dielectric antenna is provided for a high frequency wireless communication apparatus. The antenna includes a dielectric substrate and a conductive meander line layer formed on the dielectric substrate. A conductive feed line layer, having a greater line width than the width of the meander line layer, is also formed on the dielectric substrate. A conductive taper layer connects the conductive meander line layer to the conductive feed line layer. An edge of the conductive taper layer slants at an angle from an adjacent edge of the conductive feed line layer in a direction toward the conductive meander line layer.

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.

A single antenna element with a switchable extension may be used to change the size of the radiating surface and provide an antenna that has two or more separate center frequencies. The range of frequencies that may be tuned by the antenna is enhanced, while maintaining relatively low complexity tuning and matching circuitry. Switching for the extension is performed by a switching element that is located at the point of connection of the extension to the antenna element. A control line supplies a control signal to the switching element to enable and disable the extension. The control line is positioned in close proximity to the antenna element to enhance coupling between the antenna element and the control line.

A dielectric antenna is provided for a high frequency wireless communication apparatus. The antenna includes a dielectric substrate and a conductive meander line layer formed on the dielectric substrate. A conductive feed line layer, having a greater line width than the width of the meander line layer, is also formed on the dielectric substrate. A conductive taper layer connects the conductive meander line layer to the conductive feed line layer. An edge of the conductive taper layer slants at an angle from an adjacent edge of the conductive feed line layer in a direction toward the conductive meander line layer.

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.

The combination of a Vivaldi slot and a meander line loaded antenna is provided which exhibits an ultra wideband characteristic with the Vivaldi notch expanding the high end and with the meander line loaded antenna portion reducing the low frequency cut-off. When these antennas are arrayed, this array exhibits a single lobe and an ultra wide 100:1 bandwidth. The Vivaldi notch portion of the antenna accommodates the higher frequencies, whereas the meander line loaded antenna portion of the antenna accommodates the lower frequencies, there being a smooth transition region between the Vivaldi and meander line portions of the antenna and no discontinuity. In one embodiment, the antenna is made to work between 50 MHz and 1500 MHz with a VSWR less than 3:1. The Vivaldi notch meander line combination assures that for an array one does not have a separation of the elements more than a 0.5 wavelength at the highest frequency, thus to eliminate the possibility of creating grating lobes. As one goes down in frequency to {fraction (1 / 50)} of the highest frequency, the 0.5 wavelength is divided by 50. This means that antenna element spacing is 0.01 wavelength at the low frequency end, clearly below that separation which would cause grating lobes. In short, the generation of grating lobes at the high end is prevented because the antenna element spacing is less than a 0.5 wavelength, with the situation improving as one goes down in frequency.

Antenna apparatus, and an associated methodology, for a multi-frequency-band-capable radio device, such as a quad-band mobile station. The antenna apparatus forms a hybrid strip antenna having a pair of resonant elements. A first resonant element forms a peripheral loop extending about the periphery of a substrate. A meander line extends along a portion of the peripheral loop. And, second resonant element is formed of an L-shaped strip. The peripheral loop is resonant at a set of frequencies, and the L-shaped strip is resonant at a single frequency. Through appropriate selection of the lengths of the resonant elements, the frequencies at which the elements are resonant are controlled.

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.

A switched meander line structure is substituted for a lumped element antenna tuner for an order of magnitude increase in gain due to the use of the switched meander line architecture. The use of the meander line with relatively wide and thick folded legs markedly decreases I2R losses over wire inductors whose wire diameters at one-tenth of an inch contribute significantly to I2R losses. Additionally, placing solid state switches to short out various sections of a multi-leg meander line at high impedance nodes reduces I2R losses across the switching elements in the tuner.

The combination of a Vivaldi slot and a meander line loaded antenna is provided which exhibits an ultra wideband characteristic with the Vivaldi notch expanding the high end and with the meander line loaded antenna portion reducing the low frequency cut-off. When these antennas are arrayed, this array exhibits a single lobe and an ultra wide 100:1 bandwidth. The Vivaldi notch portion of the antenna accommodates the higher frequencies, whereas the meander line loaded antenna portion of the antenna accommodates the lower frequencies, there being a smooth transition region between the Vivaldi and meander line portions of the antenna and no discontinuity. In one embodiment, the antenna is made to work between 50 MHz and 1500 MHz with a VSWR less than 3:1. The Vivaldi notch meander line combination assures that for an array one does not have a separation of the elements more than a 0.5 wavelength at the highest frequency, thus to eliminate the possibility of creating grating lobes. As one goes down in frequency to {fraction (1 / 50)} of the highest frequency, the 0.5 wavelength is divided by 50. This means that antenna element spacing is 0.01 wavelength at the low frequency end, clearly below that separation which would cause grating lobes. In short, the generation of grating lobes at the high end is prevented because the antenna element spacing is less than a 0.5 wavelength, with the situation improving as one goes down in frequency.

The invention discloses a V-shaped micro-strip meander-line slow wave structure, belongs to the technical field of microwave vacuum electronics, and relates to a traveling wave tube amplifier. The V-shaped micro-strip meander-line slow wave structure comprises a micro-strip transmission line structure consisting of a metal bottom plate (3), a dielectric layer (2) and a planar metal wire (1) and is characterized in that: the dielectric layer (2) is positioned between the metal bottom plate (3) and the planar metal wire (1); the planar metal wire (1) has a zigzag structure formed by connecting a plurality of sections of planar metal wires which have the same shape and dimension end to end; and the adjacent two sections of planar metal wires constitute a V shape or a reverse V shape, and the included angle 2theta of the V shape or reverse V shape is less than 180 degrees. The shape of the dielectric layer (2) can be the same as that of the metal bottom plate (3) or the planar metal wire (1). Compared with the conventional right-angle micro-strip meander-line slow wave structure, the V-shaped micro-strip meander-line slow wave structure has wider working band and higher coupling impedance and can further meet the requirements of an equipment system on the device in aspects of working bandwidth, output power, weight and volume.

An apparatus performs dual circular polarization in a flat plate antenna simultaneously, and does not require more than two meander line polarization layers. A first linear polarization layer and a second linear polarization layer including a polarization power divider (2, 4) and a radiation panel (3, 5) positioned on the polarization power divider (2, 4), are provided to respectively perform first and second senses of linear polarization. Additionally, a first meander line polarizer layer (6) is positioned on the second linear polarization layer and a second meander line polarizer layer (7) is positioned on the first meander line polarizer layer. The first and second meander line polarizer layers (6, 7) convert linear polarization signals into a circular polarization signals.

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.

A miniaturized planar antenna of digital television comprises an insulation plate a metal radiator combined with a first surface thereof, a metal grounding element connected to a second surface thereof and a metal parasitic element. The metal radiator has a meander line portion and the metal parasitic element also has a meander line portion and is corresponding to a position of the metal radiator; the transmission efficiency of digital television signals can be elevated by broadening an electromagnetic signal receiving bandwidth of the antenna by means of the metal parasitic element.

A switched meander line structure is substituted for a lumped element coupler (10) for an order of magnitude increase in gain due to the use of the switched meander line architecture. The use of the meander line (20) with relatively wide and thick folded legs markedly decreases I2R losses over wire inductors whose wire diameters at one-tenth of an inch contribute significantly to I2R losses. Additionally, placing solid state switches to short out various sections of a multi-leg meander line at high impedance nodes reduces I2R losses across the switching elements in the coupler. It has been found that, regardless of the impedance of the antenna, this impedance may be matched by switching in and out various sections of a folded multileg meander line due to the fact that the square of the sum of the capacitive reactances of the meander line decreases with frequency in synchronism with the unloaded Q of the meander line, thus to provide the ability to maintain a good match over frequency as the meander line is tuned to achieve resonance by shorting out combinations of sections of the meander line. The result of the substitution of the meander line architecture for the lumped element coupler is the reduction of losses associated with the use of wire inductors and losses due to the interposition of solid state switches at high-current nodes.

An asymmetric slotted L-shaped antenna is provided with a wide bandwidth in an exceedingly small size with good gain across the entire bandwidth by shorting out one end of the slot and by providing a capacitor at the other end of the slot, with the result that with appropriate capacitance, spacings and dimensions, the impedance of the slotted transmission line cancels the reactance of the antenna such that the gain of the antenna can be made to match a similar sized meander line loaded antenna.

A meander line capacitively-loaded magnetic dipole antenna is disclosed. The antenna includes a transformer loop having a balanced feed interface, and a meander line capacitively-loaded magnetic dipole radiator. The meander line capacitively-loaded magnetic dipole radiator also includes an electric field bridge. For example, the meander line capacitively-loaded magnetic dipole radiator may include a quasi loop with a first end and a second end, with the electric field bridge interposed between the quasi loop first and second ends. The electric field bridge may be an element such as a dielectric gap, lumped element, circuit board surface-mounted, ferroelectric tunable, or a microelectromechanical system (MEMS) capacitor. The transformer loop has a radiator interface coupled to a quasi loop transformer interface. In one aspect, the coupled interfaces are a shared perimeter portion shared by both loops.

The invention discloses a large-wide-angle low-standing-wave microstrip frequency sweep antenna based on a suspended strip slow-wave line. One end of a suspended strip meander line is used for feeding; the middle of the suspended strip meander line is connected with a plurality of narrow-edge directional couplers, wide-edge directional couplers and broadband circular branch line couplers; the coupling port of each coupler is connected with a section of compensation line; a separating port is connected with a matched load; each compensation line is also connected to an ultra-wideband small-size microstrip dipole antenna; and the tail end of the suspended strip meander line is directly fed into one ultra-wideband small-size microstrip dipole antenna through one section of compensated line. According to the invention, the standing wave is increased; the performance of the frequency sweep antenna is enhanced; the scanning airspace of the frequency sweep antenna is greatly widened; and the structure is simple.