237 results about "Frequency coverage" patented technology

The invention relates to a radio frequency identification technology and particularly discloses a radio frequency identification method and a radio frequency identification system, which are applied in a monitoring management system for personnel, vehicles, commodities and the like. In the invention, by adopting a low-frequency awakening and information verification technology, an active tag can be subjected to high-frequency communication only within a low-frequency coverage area and does not need to work in other time, which reduces electric consumption of above 99% of time, therefore, the power supply of high-capacity batteries is not needed so that the size of the tag is further and effectively reduced. Compared with the traditional radio frequency identification technology, by adopting the mode combining the low-frequency identification and microwave signal intensity, the invention effectively improves the positioning precision to a high-speed moving object. The radio frequency identification method and system can realize the full duplex interaction of data, wherein the full duplex data communication between multiple identification objects and an information center can be realized within a large range by utilizing the characteristics of longer microwave communication distance and large wireless network capacity.

The invention provides an antenna impedance matching device, a semi-conductor chip and an antenna impedance matching method. The device comprises the semi-conductor chip and at least one impedance device, wherein the semi-conductor chip comprises a plurality of adjustable capacitors and a plurality of switches; the impedance device is located outside the semi-conductor chip; the semi-conductor chip is coupled with the impedance device through a plurality of terminals and coupled with the input end and the output end of the antenna impedance matching device; the input end and the output end of the antenna impedance matching device are respectively coupled with a radio frequency circuit and an antenna; the switches are used for switching the connection between the adjustable capacitors and the impedance device under the control of a control signal; the values of the adjustable capacitors are adjusted by adjustment signals so as to tune the impedance matching of the antenna. The embodiment of the invention can improve the frequency coverage of antenna impedance tuning so as to flexibly tune impedance matching as required.

A method and apparatus for using a guard band as a data subcarrier in a communication system supporting frequency overlay are provided. In a method of operating mobile station for using a guard band as a subcarrier for signal transmission in a communication system supporting frequency overlay, the method includes searching for a first center frequency located at a position corresponding to an integer multiple of a subcarrier spacing, after searching for the first center frequency, receiving information indicating the numbers n1 and n2 of first additional subcarriers, and performing a first network entry process by using all subcarriers including the first additional subcarriers.

A system for performing cell acquisition in a frequency overlay communication system having a first frequency band and a second frequency band including the first frequency band. A base station (BS) generates a reference signal used for identifying a cell using a specific sequence in a predetermined frequency band, and transmits the reference signal. A mobile station (MS) receives the reference signal to determine whether the BS uses the first frequency band or the second frequency band, determines a reference signal having a maximum correlation value through correlation calculation with at least one predefined sequence, and detects a BS identifier (ID) corresponding to the determined reference signal.

A frequency overlay communication system that includes a first communication system for performing communication using a first frequency band being a preset bandwidth; and a second communication system for performing communication using a second frequency band being a second preset bandwidth, wherein the second frequency band includes the first frequency band.

A wireless communication device is disclosed that is capable of utilizing bandwidth outside of its allocated bandwidth in order to maximize frequency coverage. The allocated band is separate from a neighboring band by a guard band. The device performs a scan of the neighboring band in order to determine an activity level within the neighboring band. Based on the determined activity level, the device expands its communication frequency range to include the guard band and / or the neighboring band. Once expanded, the device periodically rescans the neighboring band in order to determine whether the device must contract its frequency band out of the expanded area. The device can also receive activity level information of the neighboring band from a server via a common network infrastructure, and can coordinate expansion with other devices.

The invention discloses a method for achieving multi-frequency coverage of a wireless sensor network based on time division multiplexing, wherein the method employs two communication methods, namely, time division multiplexing and frequency division multiplexing, so that the method makes up for disadvantages that the traditional wireless sensor network has low communication rate, small node number, low data transmission reliability and the like. The invention designs a wireless sensor network receiving node with two frequency communication, wherein one frequency is used for signaling communication and the other frequency is used for data communication; the wireless sensor node builds connection with the signaling frequency of the wireless sensor network receiving node and then distributes time slot, and performs frequency hopping to a designated data frequency to perform wireless communication of the time division multiplexing. The wireless sensor network receiving node finally sends data to a remote server. The wireless sensor network has the advantages of high reliability, short adding time, fast network rate and a large number of received nodes, so that the invention is suitable for the wireless sensor network with high requirement for data transmission reliability or transmission rate.

The invention discloses a C-band high-performance balance filter based on an LTCC technology. The C-band high-performance balance filter comprises a 3dB Wilkinson power splitter (A), and signals are input through the 3dB Wilkinson power splitter. The 3dB Wilkinson power splitter is respectively connected with a +90-degree all-pass filter (B) and a -90-degree all-pass filter (C). The +90-degree all-pass filter and the -90-degree all-pass filter are connected with a balanced output port 1 and a balanced output port 2 respectively. The ranges of the two balanced output ports are equal, and the phases of the two ports differ by 180 degrees. The frequency band of the C-band high-performance balance filter is a C-band, a circuit topology is simple, and the C-band high-performance balance filter has the advantages of being wide in frequency band frequency coverage, high in ranges of outputting the two port, high in phase balance, high in output port isolation, excellent in three-port standing wave performance, good in frequency selectivity, simple in circuit structure and good in controllability, and has wide application potential in high-data-rate wireless communication in the future.

The invention discloses a multi-band smart phone antenna based on an integral metal frame. According to the multi-band smart phone antenna, no large area of space of a circuit board can be occupied while coverage of a wide band is achieved under the condition that integrity of the metal frame of a mobile phone is ensured. The multi-band smart phone antenna directly feeds electricity back to the integral metal frame through a feed piece, the integral metal frame is connected with a metal floor through a grounding piece, and therefore a first communication route and a second communication route can be formed, and finally the double-loop antenna is formed. The first communication route and the second communication route can generate low resonant frequencies to cover two low-frequency stages GSM850 / 990 respectively. In addition, the first communication route and the second communication route can generate a plurality of high-order resonance modes, and therefore coverage of high-frequency stages DCS / PCS / UMTS2100 / LTE2300 / 2500 can be achieved, and coverage of wide bands is achieved. Meanwhile, integrity of the metal frame is ensured due to the design; the structure is simple; antenna tuning is easy; no large area of space of the circuit board can be occupied; the multi-band smart phone antenna is suitable for application and popularization in the technical field of terminal antennas.

The invention discloses a 30-3000 MHz ultrashort wave receiver consisting of a channel unit, a first local oscillator unit, a second local oscillator unit and a third local oscillator unit, wherein the local oscillator signal output of the first local oscillator unit is connected with the input of a first medium mixer, the local oscillator signal output of the second local oscillator unit is connected with the input of a second medium mixer, and the local oscillator signal output of the third local oscillator unit is connected with the input of a third medium mixer. The 30-3000 MHz ultrashort wave receiver disclosed by the invention can stably receive 30-3000 MHz ultrashort wave signals and output the 30-3000 MHz ultrashort wave signals at a medium frequency of 70 MHz, the amplitude of the medium frequency can be stably output within a required range, and if 5 receivers simultaneously work, a maximal frequency coverage range can achieve 100 MHZ, and the frequency can automatically correct at a ultrashort wave frequency band; and the 30-3000 MHz ultra-short wave receiver disclosed by the invention has the advantages of strong signal detecting capability, low error rate, few signal distortion conditions, high signal to noise ratio, good spurious suppression effect, strong anti-interference capability, good ultra-short wave communication effect, simple structure and low cost, and the like.

A system and method for designing a broadband tuner such that VCO pulling is minimized and gaps in frequency coverage are avoided, while total power consumption is reduced, is disclosed. A broadband spectrum is divided into sub-bands and various multipliers to a local oscillator output are introduced. In this fashion, the present invention allows a local oscillator within the broadband tuner to always generate signals that lie outside of the broadband spectrum for a particular broadband application. Additionally, a modulus ratio for a dual modulus prescaler with the local oscillator is maximized, thereby reducing power consumption.

A system and method for transmitting and receiving frequency allocation information based on identification information in a frequency overlay system are provided. The method includes transmitting a frame of a first Frequency Allocation (FA) to Mobile Stations (MSs) by inserting control information and identification information of the MSs to which frequency resources are allocated into the first FA frame, and transmitting a second frame indicating a second FA the MSs by inserting the identification information and a resource indication of the first FA into the second FA frame. Thereby, an overhead can be reduced and a frequency resource can be used efficiently.

A method for performing an initial operation of a mobile station (MS) that uses a first frequency band, in a frequency overlay communication system having the first frequency band including a plurality of sub-frequency bands. The method includes performing correlation on a full frequency band in units of the first frequency band, receiving broadcast information through a frequency band having a maximum correlation value, and performing an initial access to a base station (BS) through the frequency band having the maximum correlation value if a frequency bandwidth of the BS acquired from the broadcast information is narrower than or equal to a selected frequency bandwidth of the MS.

The invention discloses a reversed-U-type dielectric waveguide wideband directional coupler used for a millimeter wave circuit, which is composed of two medium waveguide transmission lines and an earthing metal plate, wherein two medium waveguide transmission lines close to each other are oppositely bent, arranged separately and symmetrically at two sides of an axle wire and fixed on the earthing metal plate, so as to form an X-type structure; the coupler is characterized in that the reversed-U-type medium waveguide is used for reaching of the wideband plat coupling of the coupling section and the transition section of a coupler, and the waveguide axes of the transition section adopts hyperbolic tangent line type; the fluctuation of a coupling coefficient doesn't exceed plus or minus 0.5Db inside the frequency coverage of 6GHz, and the flat coupling property can be achieved inside wider bandwidth. Compared with the traditionally directional coupler which is completely composed of a medium mirror image line, the inverted-U-type dielectric waveguide wideband directional coupler has the advantages that transition waveguide section of the hyperbolic tangent line type is used, the metal side wall of the prior coupler which is vertical to ground in the transition waveguide section is unnecessarily used, radiation loss and metal loss are reduced, the volume of the coupler is decreased and manufacture complexity and cost are reduced, and can be conveniently produced in large quantity.

Methods, algorithms, architectures, circuits, and / or systems for increasing voltage controlled oscillator (VCO) operational frequency ranges are disclosed. In one embodiment, a VCO can include 2n+1 transconductors configured to provide an oscillating signal, where n≧1; a selectable supply voltage coupled to each of the transconductors, where a frequency range of the oscillating signal is related to the selectable supply voltage; and an adjustable input voltage, where a frequency of the VCO depends on a value of the adjustable input voltage. Also, the VCO may include a voltage regulator configured to provide the supply voltage and / or a selecting circuit configured to select a reference voltage (e.g., from the voltage regulator can produce the supply voltage). Embodiments of the present invention can advantageously provide a cost effective approach for enhancing VCO frequency ranges from a singly VCO, suitable for phase-locked loop (PLL) applications.

A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. If a dwells assigned frequency bandwidth is small and not a multiple of the minimum frequency spacing between dwells (tuning step), then coverage gaps can be inadvertently introduced between adjacent dwells. A system and method are provided for detecting this condition and generating dwells without accidental loss of frequency coverage for any combination of bandwidth and step size.

The invention discloses a wireless network planning method of the code division multiple access service. After the traffic density distribution diagram and the regional initial network topology in the planning region are generated according to the population database, the user distribution rate in the strongest pilot frequency coverage area in each cell of the planning area is calculated, and the absolute value of the difference value between the user distribution proportion in each cell of the planning area and the network average user proportion is compared with the absolute value of the load difference value threshold, if the comparison result is that the absolute value of the proportion difference value is larger than the absolute value of the load difference value threshold, the network topology of the station point of the cell opposite to the proportion difference value is adjusted, and the user distribution proportion in the cell is re-calculated to perform comparison and adjustment, and otherwise, the current planning result is output. The technical proposal of the invention simulates the actual user distribution and adjusts the network topology by utilizing the population database, the load average distribution in the cell of the planning areas is realized to the maximum extent, and the difficulty of the later network optimization is reduced.

The invention belongs to the field of acoustic metamaterial and discloses an acoustic wave focusing device based on an intrinsic displacement mode. The acoustic wave focusing device is a metallic ring-like structure and immersed in water, the metallic ring-like structure is made of copper, iron, steel, aluminum, zinc, gold, silver, nickel and synthetic metal; the acoustic wave focusing device is excellent in acoustic focusing effect, and energy is centralized because the focus is arranged at the central point of the ring-like structure; the frequency coverage area is wide, and the focusing frequency is changed in the range from 100Hz to 1GHz; the acoustic focusing effect is wide in application range and applied for the circular-ring, square or elliptical-ring structure; the acoustic wave focusing device is simple in structure, easy to realize, process and integrate, and proper in size.

A frequency overlay communication system that includes a first communication system for performing communication using a first frequency band being a preset bandwidth; and a second communication system for performing communication using a second frequency band being a second preset bandwidth, wherein the second frequency band includes the first frequency band.

A system for performing cell acquisition in a frequency overlay communication system having a first frequency band and a second frequency band including the first frequency band. A base station (BS) generates a reference signal used for identifying a cell using a specific sequence in a predetermined frequency band, and transmits the reference signal. A mobile station (MS) receives the reference signal to determine whether the BS uses the first frequency band or the second frequency band, determines a reference signal having a maximum correlation value through correlation calculation with at least one predefined sequence, and detects a BS identifier (ID) corresponding to the determined reference signal.

The invention discloses a multi-frequency-range ceiling-type antenna. The multi-frequency-range ceiling-type antenna consists of a first radiating body, a second radiating body, a round metal plate, a coaxial feed system and a supporting medium, wherein the first radiating body and the second radiating body are etched by a thin copper foil on the surface of the medium, connected in parallel with each other at the bottom and fed by a co-axis; and the round metal plate consists of a metal sheet with a proper thickness and has a function of an electromagnetic horizontal plane. On the one hand, the size of each radiating body of the antenna can be reduced effectively, and on the other hand, forward radiation of the antenna can be enhanced and backward radiation of the antenna can be weakened. The feed co-axis passes through the horizontal plane from the lower side of the horizontal plane and feeds the radiating bodies, so a coaxial external conductor is electrically connected with the horizontal plane; and an inner conductor passes through a central round gap of the horizontal plane and is directly connected with the radiating bodies electrically. The coaxial impedance is equal to 50 ohms, so the multi-frequency-range ceiling-type antenna can be conveniently cascaded with other microwave systems and is applied to actual engineering. The multi-frequency-range ceiling-type antenna is massive in working frequency, so that the problem that the conventional ceiling-type antenna is single in frequency coverage is solved effectively.

The invention relates to a low-temperature co-fired ceramic ultra-wideband micro filter, comprising input and output interfaces suitable for pasting on a surface; input and output inductors; nine parallel resonance units implemented by three-layer folded coupling strip line and comb type coupled resonance structures; and eight groups of enhanced coupling diaphragms with resonance levels which are directly connected with each other, the structures are implemented by multi-layer low-temperature co-fired ceramic technology. According to the invention, the low-temperature co-fired ceramic ultra-wideband micro filter has the advantages of wide frequency coverage, low insertion loss, good controllability, small volume, light weight, high reliability, good electrical property, good phase frequency characteristic linearity, good temperature stability, low cost and mass production, and is particularly applied to fields of millimeter wave communication, microwave navigation, guidance, telemetry, remote control, satellite communication and military confrontation, and corresponding frequency range systems having excessive demand on volume, weight, electrical property and reliability.

The present invention discloses a mobile terminal antenna multiplexing system and a control method thereof and a mobile terminal. The mobile terminal antenna multiplexing system comprises a radiatingbody, multiple antenna accesses, a CPU processor and a radio frequency module, each antenna access comprises one feed point, one matching module and one switching module. The antenna radiating body ofthe mobile terminal is provided with a plurality of feed points, each feed point is connected with one switch, the each feed point is provided with one independent matching circuit, the mobile terminal controls the on-off switch of the switch through the CPU processor according to the concrete application demand and the environmental state of the mobile terminal so as to change the resonant frequency of the corresponding antenna, corresponding antenna accesses are selected through the radio frequency modules to achieve antenna multiplexing. On the premise without increasing the number of themobile terminal antennas, the mobile terminal antenna radiators can be more intelligently and reasonably utilized, and the frequency coverage and the receiving and transmission performances of the mobile terminal antennas are improved.

The invention relates to a metal frame mobile phone antenna, a control system and a communication terminal. The metal frame mobile phone antenna includes a metal frame, and two seams are symmetricallyformed in both sides of one end of the metal frame; a first point of a grounding switch interface, a second point of the grounding switch interface, an electricity feeding input point and a third point of the grounding switch interface are sequentially arranged on the metal frame from one end of one seam at intervals. Through different connection points of the first point and second point of thegrounding switch interface, control over the coverage of high frequency and middle frequency is achieved, multiband frequency coverage of the antenna is ensured, and different inductors are connectedin a grounding unit to further refine medium frequency coverage; the communication capability of the metal frame antenna is improved, and the communication quality is ensured for users.

The invention discloses a quasi-surface plasmon ultra-wide band low-scattering slot antenna. Radiation apertures have circular structures in same area; the radius of a circle is r1=68mm; the thickness of a dielectric slab of an SSPP slot antenna is 1mm; a metal coats a rear feeding part covering an area of 20mm*40mm on the SSPP slot antenna; a 26mm*2mm gap is formed on a central position of the SSPP slot antenna; the rest positions are not coated with the metal; a dielectric constant of the dielectric slab is 2.65; the loss tangent is less than 0.001. The quasi-surface plasmon ultra-wide band low-scattering slot antenna is realized by the invention; the antenna has an obvious RCS (Radar Cross Section) reduction effect within 1GHz-10GHz; the maximum reduction volume of MRCS is 16.93dB or above; the relative bandwidth of the SSPP slot antenna is 9.4%; the frequency coverage is 5.25GHz-5.77GHz; compared with the traditional antenna, the SSPP antenna has the advantage that the beam width is at least widened for 65 degrees.

A triple-transverse electromagnetic cell field intensity tester is an electromagnetic compatible tester capable of producing triple effect, which has a frequency coverage range superior to 10 kHz to 1 Ghz and can be used for testing radiation sensitivity and electromagnetic radiation of electronic equipment. A housing at a taper top portion (7) of the tester is expanded to form a bell mouth (19) and gradually changes to a pyramidal cavity, and the terminals are sealed by an aluminum plate (23). The tester has a double-port input structure, i.e. two coaxial plugs (17) are arranged on the taper top, and the inner conductors of the two coaxial plugs (17) are sequentially expanded to form a tapered matching adjusting core block (18) and an axe-shaped transition block (20), which are respectively connected with a trapeziform horizontal core plate (1) and a trapeziform vertical core plate (2) separated from but orthogonal to each other to form two plate-shaped inner conductors. The terminals of the inner conductors are matched with each other through a non-inductance resistor array (8) and a pyramidal wave absorbing material (9). Large-area grounding switching between the horizontal and the vertical core plates can be achieved by adopting a connection rod and a swing lapped plate, thus ensuring high-frequency grounding performance.

The invention relates to an omnidirectional antenna of a communication system, in particular to a multi-band broadband dual-polarization LTE omnidirectional antenna. The multi-band broadband dual-polarization LTE omnidirectional antenna comprises a passive splitter filter, a horizontal polarization low-frequency oscillator unit, a horizontal polarization high-frequency oscillator unit, wherein the horizontal polarization low-frequency oscillator unit at least comprises three sheets, and the horizontal polarization low-frequency oscillator unit, the horizontal polarization high-frequency unit are connected with the passive splitter filter via a unit feeding coaxial cable. Depending on the combiner characteristic and the filtering characteristic of the passive splitter filter, the signals of the horizontal polarization low-frequency oscillator unit and the horizontal polarization high-frequency unit are integrated via the directional diagram overlapping synthesis technology of multi-frequency combined combiners, the function of a horizontal polarization full-band unit is achieved, and full-band coverage of horizontal polarization is achieved. The antenna has high data throughput capacity, can satisfy the frequency coverage demand of the fourth generation of mobile communication standard 4G LTE, and realize multi-input and multi-output data receiving and transmitting.

An apparatus and method for transmitting / receiving a paging message in a frequency overlay communication system are provided. The method includes determining if information is to be transmitted to a Mobile Station (MS) that is in an idle state, determining a sub frequency band for allocation to the MS, and transmitting a paging message to the MS using the determined sub frequency band.

A method and apparatus for facilitating downstream frequency override in a data-over-cable system is described. In one example, a data-over-cable system having a plurality of cable modem termination system (CMTS) elements is described. Each of the CMTS elements includes demodulation logic configured to detect one of a plurality of native preambles in upstream transmissions. Each of the native preambles may include a first section having a unique pattern and a second section having an equalizer training sequence. A concatenated preamble is formed from each of the native preambles. The concatenated preamble may include a first section having the unique pattern of each of the native preambles in a sequence and a second section having an equalizer training sequence. A burst profile is formed having the concatenated preamble for each of the CMTS elements. The burst profile is transmitted from each of the CMTS elements to a plurality of cable modems.

The present invention relates to a method of broadcasting and receiving a neighboring base station advertisement message in a wideband wireless access system and a handover method using the same. In the present invention, a base station broadcasts a neighboring base station advertisement message including information that indicates that frequency overlay is supported in neighboring base stations to terminals. The terminal confirms whether frequency overlay is supported in the neighboring base stations included in the neighboring base station advertisement message, and can perform handover to a frequency overlay supporting base station as a destination base station. According to the present invention, when a non-frequency overlay communication system and a frequency overlay communication system are mixed with each other, it is possible to ensure that a frequency overlay supporting terminal performs handover from a base station of a frequency overlay communication system to a base station of another frequency overlay communication system.