64results about How to "Antenna structure is simple" patented technology

Wireless devices, and particularly mobile devices such as cellphones, PDAs, computers, navigation devices, etc., as well as other devices which transmit or receive data or other signals at multiple frequency bands utilize at least one antenna to transmit and receive and a plurality of different bands (e.g., GSM cellular communication band; Bluetooth short range communication band; ultrawideband (UWB) communications, etc.). These wireless devices can simultaneously transmit or receive at a plurality of different bands, or simultaneously transmit and receive at different bands. The wireless devices have the ability to use a single physical structure (e.g., an antenna) for transmission and reception of many different bands. The antenna can be either actively tuned or passively tuned using one or more elements.

An adjustable monopole antenna especially intended for the mobile terminals. The adjusting circuit (930) of the antenna is located between the radiator (920) and the antenna port of a radio device and forms, together with the antenna feed conductor (901), a feed circuit. This circuit comprises an adjustable reactance between the feed conductor and the ground in series with the feed conductor or in both of those places. For example, the feed conductor can be connected by a multi-way switch to one of alternative transmission lines, which are typically short-circuited or open at their tail end and shorter than the quarter wave, each line acting for a certain reactance. The antenna operating band covers at a time only a part of the frequency range used by one or two radio systems, in which case the antenna matching is easier to arrange than of a real broadband antenna. The space required for both the radiator and the adjusting circuit is relatively small. There is no need to arrange a coupling to the radiator for the antenna adjusting, which means a simpler antenna structure and thus savings in production costs.

An antenna device capable of increasing the speed of scanning as well as extending the scanning angular range of a beam to obtain a high gain. A radar module and a communication apparatus having enhanced detection capabilities obtainable by using the antenna device. In the antenna device, electromagnetic waves radiated from a primary radiator are transmitted to a plurality of openings, e.g., dielectric lenses and/or reflectors or optical transmitters. The dielectric openings are arranged on a fixed portion and the primary radiator is arranged on a moving portion. The moving portion is displaced relatively with respect to the fixed portion. This arrangement enables the selection of an opening used for receiving each of the electromagnetic waves from the primary radiator to change the direction of the beam.

The present invention relates to a bent folded dipole antenna for reducing a beam width difference, which can reduce a beam width difference, varying with a frequency band, and generate dual polarization through the use of an antenna structure having a bent folded dipole antenna unit, in which a plurality of bent folded dipole components is connected to each other as a single pattern, and a feeding unit for feeding a signal to the folded dipole antenna unit.

Therefore, the present invention is advantageous in that it can reduce a beam width difference varying with a frequency band, simplify the structure of the antenna to reduce the cost thereof, and easily obtain dual polarization characteristics and wide band characteristics by combining a feeding unit for feeding a signal in a dual feeding manner with the bent folded dipole antenna unit implemented as a single pattern. In addition, the present invention is advantageous in that current flowing into the feed point of the feeding unit is induced only in folded dipole components without flowing into another feed point, thus realizing excellent isolation characteristics.

An antenna (100) for a magnetic resonance device has a predetermined sensitivity and is designed to excite and/or detect a magnetic resonance in an object under test. The antenna (100) includes a stripline resonator (10) that is equipped with at least one stripline (11), and a conductor loop arrangement (20) that adjoins the stripline resonator (10) and forms at least one conductor loop (21, 22, 28) which is interrupted by at least one capacitor (23). The sensitivity of the antenna (100) is formed by overlapping sensitivity profiles of the stripline resonator (10) and the conductor loop arrangement (20). Also described are an antenna array (200) including a plurality of antennas (100), a magnetic resonance device (300) including at least one antenna (100) or antenna array (200), and methods for magnetic resonance imaging or magnetic resonance spectroscopy.

The invention relates to a planar patch antenna for substrate integration waveguide slotting coupled feeding. The planar patch antenna for the substrate integration waveguide slotting coupled feeding comprises a lower layer substrate integration waveguide structure and an upper layer patch antenna. The lower layer substrate integration waveguide structure comprises a lower layer substrate, two metal plates which are arranged on the front face of the substrate and the back face of the substrate respectively, two rows of metalized through holes which are formed between the substrates and a gap which is formed in the metal plate on the front face of the lower substrate. The upper layer patch antenna comprises an upper substrate and a radiation metal patch. The upper layer patch antenna is laminated on the lower layer substrate integration waveguide structure, and electromagnetic coupled feeding is conducted through the adoption of the slotting gap on the metal plate on the front face of the lower layer substrate integration waveguide structure. The planar patch antenna for the substrate integration waveguide slotting coupled feeding is simple in structure, easy to machine, capable of being easily integrated with a circuit, low in loss, and capable of being widely applied to microwave millimeter wave antennas.

The invention relates to a frequency-reconfigured built-in antenna, comprising an antenna stand (13), antenna patterns (14) on the antenna stand and connectors of the antenna patterns, wherein the connectors are electrically connected with a circuit board; the antenna patterns are monopole antenna patterns of which two ends are respectively connected with respective connector; the connector at one end is electrically connected with a feeding terminal on the circuit board, and the connector at the other end is sequentially connected with a gating switch (16) on the circuit board as well as a short-circuit arm and a grounding elastic sheet for regulating frequency on the circuit board. According to the frequency-reconfigured built-in antenna, one antenna pattern can work under a monopole or loop-circuit antenna mode by controlling the gating switch; and the frequency-reconfigured built-in antenna can meet the multi-band working requirement of a handheld device, is simple and compact in structure, and can greatly save antenna space.

The invention discloses a double-frequency Beidou navigation antenna with a wide-axis-ratio wave beam effect. The antenna comprises a laminated patch antenna, a double-frequency feed network, a feed probe and a short-circuit probe; the laminated patch antenna comprises a first printed circuit board, a second printed circuit board and a floor which are sequentially arranged from top to bottom; thefirst printed circuit board comprises a first circular patch and a first dielectric slab which are sequentially arranged from top to bottom; the second printed circuit board comprises a second circular patch and a second dielectric slab which are sequentially arranged from top to bottom; and the floor comprises a central round floor, an annular gap and a floor edge resistor which are sequentiallyarranged from the center to the edge of the floor. Due to the adoption of the floor 13 design, the antenna has the good double-frequency wide-axis-ratio wave beam effect; and in addition, the antennais simple in structure, stable in gain and small in size, and is very suitable for serving as a China Beidou second-generation navigation antenna.

An antenna structure including a ground plate, a hollow bolt, and a conductive conical dome is provided. The hollow bolt passes through the ground plate, and a signal wire is laid in the hollow bolt. An insulator is disposed between the signal wire and the hollow bolt for providing electrical isolation therebetween. The conductive conical dome is connected with one end of the signal wire. The hollow bolt and a nut are provided to fix the antenna on a wall or a ceiling. Since the signal wire is laid in the hollow bolt, the signal wire can be connected to a signal source only by connecting a signal cable to the hollow bolt.

The invention relates to a UHF RFID card reader antenna. The antenna comprises radiation unit layers with radiation patches, parasitic patch layers with parasitic patches, feed structural layers withfeed strips and metal floors; the parasitic patch layers are oppositely arranged on one sides, towards the radiation patches, of the radiation unit layers at intervals; the feed structural layers areoppositely arranged on one sides, back to the parasitic patch layers, of the radiation unit layers at intervals; the metal floors are oppositely arranged on one sides, back to the radiation unit layers, of the feed structural layers at intervals; in addition, the two ends of the feed strips are electrically connected with the metal floors and the radiation patches; and the feed strips adopt a shape of an Archimedean helical curve, and a width gradually-changed structure. The UHF RFID card reader antenna is simple in feed structure, so that the overall antenna structure is simple in structure.The invention also relates to a UHF RFID card reader system which comprises the UHF RFID card reader antenna. Therefore, the UHF RFID card reader system can be applicable to the use frequency band ofthe world-wide UHF RFID, and simplification and miniaturization of the overall system structure can be realized.

A simplified helix antenna structure for communication equipment, the antenna is mounted in an internal insulating sleeve thereof with a spiral coil for receiving and emitting signals, the spiral coil is positioned in the antenna under pressure; the bottom end of the spiral coil is a downwardly extending portion which has a specific length with partial length thereof exposed to the outside of the antenna, and the end of the extending portion is electrically connect with an antenna line of an electric circuit board inside of the communication equipment after assembling of the antenna on the equipment. The elastic contact piece and the internal metallic receiving seat used conventionally can thus be saved, and the structure of the helix antenna can be simplified.

A receiving array antenna with a variety of channels for converting received signals from receiving antenna elements (ANT) into an intermediate frequency signal (ZF) by using a circuit having one or several preamplifiers (LNA) and a mixer (MIX) connected in series, whereby a centrally generated local oscillator signal (LO) and calibration signal (CAL) are supplied to the circuit. A common distribution network (VNG) is available for the central oscillator signal (LO) and calibration signal (CAL), which is interconnected in such a way that the central local oscillator signal (LO) and calibration signal (CAL) is coupled into the circuit at the output of the receiving antenna element (ANT).

A helix antenna for satellite connections of mobile devices is to be fed from above, and all its radiators are side by side on a same geometric cylindrical surface. The antenna has at least two resonances. In the case of two-resonance every second radiator resonates at a lower frequency and the rest of the radiators at another, higher frequency, the frequency difference being based on the difference in the physical length of the radiators. One conductor of the feed line of the antenna is connected directly to one half of the radiators and the other conductor to the other half of the radiators. No separate feed circuit for the phase shifts is required in an antenna with plurality of helix radiators, because the phasing can be implemented by the positioning of the radiators and the fine tuning of their length. The antenna structure is simple, and case its production costs are relatively low.

A wideband circular polarization directional antenna array based on a single double-face printing circuit plate comprises a dielectric substrate, a crossfeed network located on the front surface of the dielectric substrate, a grooved floor located on the reverse surface of the dielectric substrate, a reflecting plate located under the dielectric substrate and a nylon pillar connecting the dielectric substrate and the reflecting plate. Four unit groove antennas are etched in the grooved floor, each unit groove antenna is composed of an annular groove and two square grooves separately by 90 degrees, and four square grooves are further etched in the edges of the grooved floor to improve the gain characteristic of the array. A microstrip line of the tail end of the crossfeed network crosses the two square grooves of each unit groove antenna on the grooved floor, thereby exciting the unit groove antennas. Unit circular polarization is achieved through two orthogonal modes of the annular groove antennas and a feed method with the phase difference of 90 degrees, and a 2*2 antenna array is achieved through the crossfeed network. The wideband circular polarization directional antenna array based on the single double-face printing circuit plate can cover a wider frequency band, and meanwhile is simple in structure, low in cost, capable of being formed at one time and good in process consistency.

A dual-polarization omnidirectional antenna includes a reflecting base plate, a radiating oscillator, outputting coaxial cables, RF connectors, a metallic supporting pillar and a T-shaped probe. The radiating oscillator has an upper layer provided with a one-to-two feed dividing network and a lower layer provided with a round patch; the T-shaped probe is welded with the round patch. A mixing ring is arranged on the reflecting base plate; two RF connectors are respectively connected with a first port and a second port of the mixing ring; an inner conductor of a first outputting coaxial cable has a first end connected with the feed dividing network and a second end connected with a third port of the mixing ring; an inner conductor of another outputting coaxial cable has a first end connected with the T-shaped probe and a second end connected with a fourth port of the mixing ring.

The invention relates to a Minkowski-based microstrip patch antenna and a manufacturing method thereof. Various kinds of technical and shaping operations are performed on a microstrip patch antenna; on the basis of a Minkowski split structure, slotting treatment is performed according to the one-dimensional characteristics of a microstrip patch, and a short-circuit loading technique is utilized, and therefore, the Minkowski split structure-based microstrip patch antenna can be obtained. The operating frequency of the antenna is 915 MHz; and the size of the patch can be as small as 24.6 mm*24.6 mm, the height of the patch is only 1.2 mm, and therefore, the size of the antenna can be greatly decreased. The antenna has the advantages of simple structure, small size, light weight, low profile and easiness in integration, and can be used for an ultra-high frequency (UHF) RFID (radio frequency identification) system; and the patch antenna is easy to manufacture, and therefore, practical requirements for being applied to anti-metal environments, of the antenna can be satisfied.

The invention relates to a characteristic-mode-theory-based method for designing a two-port MIMO antenna with a reconfigurable directional pattern. The method comprises: step one, a characteristic mode curve of a rectangular metal copper-clad plate is calculated according to a characteristic mode theory and thus the shape and dimension of the metal copper-clad plate have n resonance modes with feature values of 0 in a working band, wherein the n is larger than or equal to 3. Step two, characteristic currents of the resonance modes are extracted and a characteristic current vector distributionmap is generated, wherein a lowest current location in the characteristic current vector distribution map is a feed point location corresponding to each mode and the structure of a radiation floor andneeded two groups of resonance modes are obtained by the feed point locations; step three, two groups of corresponding capacitive coupling units are introduced at the feed point locations corresponding to the two groups of resonance modes; and step four, two reconfigurable feed networks are designed and power is fed between each group of capacitive coupling unit and the radiation floor in the step three so as to generate excitation voltages to excite the corresponding resonance modes.