402 results about "Single band" patented technology

A transceiver includes a transmitter and a homodyne receiver, wherein the receiver is used to process both antenna-received and antenna-reflected signals. Thus, during a receive mode, for example, the receiver downconverts antenna-received signals to baseband signals, which are then processed to recover receive signal information. Then, during a transmit mode for example, antenna-reflected transmit signals are fed back to the receiver, which is retuned to the desired transmit frequency, and thus downconverts the reflected transmit signals to baseband signals. These baseband signals are then processed to obtain a characterization of impedance mismatch between the transceiver's transmitter and the associated antenna. An adjustable matching network disposed in the transmit signal path thus may be adjusted based on the characterization to reduce the mismatch. Such configurations may be used with either single-band or multi-band embodiments of the transceiver, and the transceiver may be used in both TDMA and CDMA communication systems.

Disclosed are various embodiments of circuitry for coupling first and second transceivers of a dual band radio telephone to integral and external antennas. The circuitry uses impedance matching lengths of transmission lines and switches arranged to provide a minimum insertion loss. Also disclosed is an embodiment for use with a single band radio telephone, such as a digital TDMA radio telephone that either transmits or receives at any given time. Also disclosed is an antenna switching arrangement for a dual band phone that eliminates a requirement for duplexers.

A receiver having multi-mode and multi-band functionality and capabilities is described herein. The receiver is capable of selectively operating over a plurality of bands and channels. The receiver operates in a plurality of modes, including but not limited to a single band / channel mode, and a multiple band / channel mode. The receiver may form a portion of a transceiver. The transceiver may also include a transmitter. In an embodiment, the transceiver is a family radio service (FRS) unit, although the invention is not limited to this embodiment.

A low cost and multi-featured antenna is disclosed. The antenna employs a radiating element mounted to a ground plane and having first and second branches spaced above the ground plane forming a generally L shaped planar radiating structure. The antenna can be either linear or circular polarization, and can be either single band or dual band, and only one feeding port is needed to obtain circular polarization. The antenna can be easily applied to various frequency bands.

DC inductive FSS technology is a printed slow wave structure usable for reduced size resonators in antenna and filter applications of wireless applications. It is a dispersive surface defined in terms of its parallel LC equivalent circuit that enhances the inductance and capacitance of the equivalent circuit to obtain a pole frequency as low as 300 MHz. The effective sheet impedance model has a resonant pole whose free-space wavelength can be greater than 10 times the FSS period. A conductor-backed DCL FSS can create a DC inductive artificial magnetic conductor (DCL AMC), high-impedance surface with resonant frequencies as low as 2 GHz. Lorentz poles introduced into the DCL FSS create multi-resonant DCL AMCs. Antennas fabricated from DCL FSS materials include single-band elements such as a bent-wire monopole on the DCL AMC and multi-band (dual and triple) shorted patches, similar to PIFAs with the patch / lid being a DCL FSS.

A front-end circuit for a wireless communication unit includes at least two antenna feeds. At least one of the antennas is coupled to an antenna switch. The circuit comprises filters and duplexers and is prepared to operate a number of FDD frequency bands. Each FDD band comprises an Rx band for receive signals and a Tx band for transmit signals. The circuit provides a single band operation mode for each frequency band and aggregated band operation modes. In an aggregated band operation mode Rx signals can be received in two different frequency bands at the same time as well as Tx signals can be transmitted in at least one of the two different frequency bands. In addition, TDD bands as well as GSM bands are covered.

The invention relates in part to a folded dipole having a dipole axis and a pair of arms which together have a profile which is concave on one side and convex on the other when viewed along the dipole axis. The dipoles may be arranged as a dipole box around a central region, typically in a generally circular or square configuration. Further elements may be placed in the dipole box or in the gaps between dipole boxes. The antenna may be a single-band antenna, or a multi-band antenna with the further elements operating in a different frequency band to the dipole boxes. The further elements may be concentric dipole boxes. The invention is particularly suited for use in a cellular base station panel antenna. A novel coaxial to microstrip transition is also described.

The invention is directed to a method and system for equalizing the signal losses over cable runs in a Distributed Antenna System (DAS). In a DAS, two or more antennae are connected to the system by cable runs that can vary widely in length. As a result, the signal loss over a given cable run can also vary widely which can impact the design and deployment of the DAS and reduce antenna spacing. In addition, for a broadband DAS that supports many frequency bands or ranges using a common antenna unit, the signal losses vary with respect to frequency further making it difficult to equalize the cable losses. According to one embodiment of the invention, the method and system provide for measuring and adjusting the signal losses of each cable run to be a predefined value. According to another embodiment of the invention, the DAS can include a hybrid passive-active antenna unit for use in a DAS which includes a frequency multiplexer that separates the signal into frequency bands or ranges that are connected to an antenna element associated with a particular frequency band or range. Where a single frequency band needs to be amplified (or attenuated), a single band amplification block (SBAB) can be inserted in the connection between the frequency multiplexer and the antenna element to amplify (or attenuate) the desired frequency band. Where more than one frequency band need to be amplified (or attenuated), a multiband amplification block (MBAB) can be inserted in the connection between the frequency multiplexer and the appropriate antenna element to amplify (or attenuate) the desired frequency bands.

A film thickness measurement apparatus has an image pickup part (32) for acquiring a plurality of single-band images corresponding to a plurality of wavelengths, and the image pickup part (32) acquires a plurality of reference single-band images representing a pattern on a reference substrate. A correction factor setting part (51) performs setting of a plurality of correction factors in accordance with distances from a specified pixel by using a plurality of reference single-band images. Subsequently, the image pickup part (32) acquires a plurality of measurement single-band images representing a pattern on an objective substrate and corrects a value of the specified pixel for each of a plurality of measurement single-band images by using the value of the specified pixel and values of pixels surrounding the specified pixel and the correction factors. A spectral reflectance calculation part (52) thereby calculates a reflectance at a measurement point on the objective substrate which corresponds to the specified pixel on the basis of the corrected value of the specified pixel with high accuracy.

Circuitry, architectures, devices and systems for multi-band radio communications using a balanced-unbalanced duplexer. An integrated balanced-unbalanced duplexer for multi-band communications may include an unbalanced multi-band port; a first balanced single-band port; a second balanced single-band port; a first unbalanced coupling arm conductively coupled to the unbalanced multi-band port; a second unbalanced coupling arm conductively coupled to the unbalanced multi-band port; a first pair of balanced coupling arms conductively coupled to the first balanced single-band port and electromagnetically coupled to the first unbalanced coupling arm; and a second pair of balanced coupling arms conductively coupled to the second balanced single-band port and electromagnetically coupled to the second unbalanced coupling arm. The architectures and / or systems generally include components embodying one or more of the concepts disclosed herein.

A film thickness measurement apparatus has an image pickup part (32) for acquiring a plurality of single-band images corresponding to a plurality of wavelengths, and the image pickup part (32) acquires a plurality of reference single-band images representing a pattern on a reference substrate. A correction factor setting part (51) performs setting of a plurality of correction factors in accordance with distances from a specified pixel by using a plurality of reference single-band images. Subsequently, the image pickup part (32) acquires a plurality of measurement single-band images representing a pattern on an objective substrate and corrects a value of the specified pixel for each of a plurality of measurement single-band images by using the value of the specified pixel and values of pixels surrounding the specified pixel and the correction factors. A spectral reflectance calculation part (52) thereby calculates a reflectance at a measurement point on the objective substrate which corresponds to the specified pixel on the basis of the corrected value of the specified pixel with high accuracy.

The invention discloses a device for collecting a multispectral image and a method thereof. The device at least comprises an infrared sensor (1), a device cover (2), ground glass (4), a multispectral light source circuit (5), a device transverse plate (6), a CCD camera (7), a power circuit (8) and a singlechip controlling circuit (9). Under a multi-spectral condition, the device and the method adopt active light of a single band and / or combined band of 400nm to 1,060nm to illuminate a palm to realize image shoot; and a light source is adjusted through a computer soft control method to realize high-quality image acquisition, display and storage. The utilization device and the method are used for obtaining high-quality palm images under the multi-spectral condition, and information including a palm print, a finger print, a palm vein and the like, thus solving problems of in vivo detection and improving the accuracy and safety of a palm biometrics identification system.

A hard disk drive that includes a disk with data written onto a plurality of tracks, a spindle motor that rotates the disk, and a head that is coupled to the disk. The disk drive also includes a circuit that writes data onto a first writable shingle band of tracks if the first writable shingle band is adjacent to a guard band of tracks. The first writable shingle band includes a number of tracks that is a function of a head width. The guard band of tracks is capable of becoming a writable shingle band. Changing the designation of a shingle band between guard and writable creates floating guard bands. The creation of floating guard bands allows for the writing of a single band without having to move and restore adjacent tracks until reaching a fixed guard band as required in the prior art.

A high-chroma omnidirectional red structural color pigment. The omnidirectional structural color pigment is in the form of a multilayer stack that has a reflective core layer, a metal absorber layer extending across the reflective core layer and a dielectric absorber layer extending across the metal absorber layer. The multilayer stack reflects a single band of visible light with a hue between 0-40°, and preferably between 10-30°, on an a*b* Lab color map. The single band of visible light has a hue shift of less than 30° on the a*b* Lab color map when viewed from all angles between 0-45° normal to an outer surface of the multilayer stack.

A streaker device for streaking a microbial inoculum for single colonies on the surface of a solid growth medium. The streaking device has a row of spaced apart contact surfaces for contact with the surface of the solid growth medium. The spaced apart contact surfaces are resiliently flexibly supported by a common support member so as to accommodate variations in depth of growth medium. The spaced apart contact surfaces may be provided on lowermost part of axially curved portions of plastics straps, that are angled backwardly. It is found that formation of a single band can give separation into single colonies. Also provided is an automatic streaking apparatus.

A hard disk drive that includes a disk with data written onto a plurality of tracks, a spindle motor that rotates the disk, and a head that is coupled to the disk. The disk drive also includes a circuit that writes data onto a first writable shingle band of tracks if the first writable shingle band is adjacent to a guard band of tracks. The first writable shingle band includes a number of tracks that is a function of a head width. The guard band of tracks is capable of becoming a writable shingle band. Changing the designation of a shingle band between guard and writable creates floating guard bands. The creation of floating guard bands allows for the writing of a single band without having to move and restore adjacent tracks until reaching a fixed guard band as required in the prior art.

The invention discloses a multi-band transceiver and multi-band radio frequency signal sending and receiving method. The method includes a transceiving antenna used for receiving an uplink multi-band radio frequency signal sent by a mobile station and transmitting a downlink multi-band radio frequency signal sent by a base station; a transceiving duplexer module used for filtering an out-of-band interference signal or spurious signal, filtering the uplink multi-band radio frequency signal received by the transceiving antenna and sending the signal to a receiver, and filtering the downlink multi-band radio frequency signal output by a transmitter and sending the signal to the transceiving antenna to be transmitted; the receiver used for dividing the multi-band radio frequency signal into multiple paths of single-band radio frequency signals to be processed after low noise power amplification is performed on the uplink multi-band radio frequency signal; and the transmitter used for merging the multiple paths of single-band signals into one path of multi-band radio frequency signal and performing power amplification, and sending the amplified downlink multi-band radio frequency signal to the transceiving duplexer module.

The invention relates in part to a folded dipole having a dipole axis and a pair of arms which together have a profile which is concave on one side and convex on the other when viewed along the dipole axis. The dipoles may be arranged as a dipole box around a central region, typically in a generally circular or square configuration. Further elements may be placed in the dipole box or in the gaps between dipole boxes. The antenna may be a single-band antenna, or a multi-band antenna with the further elements operating in a different frequency band to the dipole boxes. The further elements may be concentric dipole boxes. The invention is particularly suited for use in a cellular base station panel antenna. A novel coaxial to microstrip transition is also described.

The invention discloses a hyperspectral imaging technology-based fish fat content distribution detection method. The method comprises the following steps of (1) acquiring single-band spectral images of fish to be detected at 12 characteristic wavelengths, wherein the 12 characteristic wavelengths are 956nm, 975nm, 1,033nm, 1,081nm, 1,129nm, 1,153nm, 1,205nm, 1,234nm, 1,282nm, 1,354nm, 1,522nm and 1,627nm respectively; (2) converting the single-band spectral images in the step (1) into reflectivity images according to a linear relationship between gray values of the single-band spectral images and reflectivity; (3) calculating fish fat content corresponding to each pixel in the reflectivity images of the fish according to a formula. According to the fish fat content distribution detection method, the detection accuracy is high and the detection time is short; not only is environmental pollution alleviated, but also the detection cost is lowered to a certain extent.

Apparatus and methods are disclosed for passive millimeter wave measurements to provide tropospheric profiles of temperature, water vapor, cloud liquid water, pressure, and refractivity utilizing a single band microwave receiver operating in the vicinity of the water vapor emission line centered at 183.31 GHz or other millimeter wave water vapor line. Ancillary meteorological measurements may be provided to refine profile outputs. Retrieval method training adapts and refines system output to provide useful information for weather nowcasting and forecasting, aviation safety, transport of pollutants, prediction of fog and other weather phenomena, and radar and optical ducting prediction.

What is disclosed is a method for vehicle occupancy detection using a single band infrared imaging system. First, an infrared image of a vehicle intended to be processed for human occupancy detection is captured using a single band infrared camera set to a predefined wavelength band. A candidate sub-image is identified within the captured image. A cumulative histogram is formed using the reflectance values of each pixel in the candidate region. A threshold reflectance value is then determined from the cumulative histogram using a pre-defined cumulative occurrence fraction value which corresponds to a value equivalent to an average sized human face. Embodiments for setting the threshold reflectance value are disclosed. Thereafter, human occupants can be distinguished in the image from the vehicle's interior by comparing pixel reflectances in the sub-image against the threshold reflectance value.

The invention provides a pipeline leakage feature vector extraction method based on an improved wavelet packet and relates to the technical field of signal feature extraction. The method comprises the first step, the second step and the third step of acquiring a signal and conducting denoising on the signal, the fourth step of adopting an improved wavelet packet algorithm to reconstruct a single-band signal, and the last two steps of extracting a feature vector. In order to overcome the shortcomings of a traditional wavelet packet algorithm, the improved wavelet packet algorithm is disclosed, and a signal prolongation mode and a signal processing mode after convolution are combined to improve the wavelet packet algorithm. A parabola prolongation mode is adopted in the improved algorithm, and FFT and IFFT are adopted in the signal processing mode after convolution. Test results show that the phenomenon of redundant frequency components generated during reconstruction of the single-band signal can be overcome by the improved algorithm, a leakage feature signal is accurately reconstructed, and the feature vector is accurately extracted. The pipeline leakage feature vector extraction method greatly increases detection accuracy, reduces the false alarm rate and also lays a foundation for improving follow-up locating precision.

A water soluble extract of M.charantia named MC6, methods for its preparation and methods for its use in the treatment of hyperglycemic disorders are provided. The active MC6 is characterized by moving as a single band on SDS-PAGE having a molecular weight of less than 10 kDal, and by comprising three peptides. Also provided is a peptide component of MC6 named MC6.1, as well as analogues and mimetics thereof. The active MC6, MC 6.1, MC6.2, and MC6.3 exhibit hypoglycemic activity, even following oral administration. Also provided are methods of using the active agents to treat hyperglycemic disorders, particularly diabetes, where the active agents are preferably orally administered.