30 results about "Pcs band" patented technology

The invention is a device for multi-band, multi-channel, wireless communications that automatically provides signal amplification when and where necessary, and that automatically avoids harmful interference to base stations and other parts of the communications infrastructure. The device is especially suitable for, but not limited to, cellular and PCS bands and channels. The invention is a unique combination of an adjustable gain, bidirectional amplifier, a GPS receiver, a processor, and one or more removable, non-volatile, updatable memory devices. Alternatively, the memory can be an internal device accessible via an electronic port such as a USB. In either case, the memory stores comprehensive information that determines if amplification is necessary at a particular location sensed by the GPS receiver. Because the memory devices are updatable, they therefore provide protection against piracy and unauthorized and improper use. As an added measure of protection for the wireless networks, the device includes a dedicated apparatus that permits a service technician to remotely deactivate it in the event of a malfunction.

Provided is dual-band inverted-F antenna for GSM, DCS, and PCS bands comprising a primary radiating member including integral first and second metallic strips, a feeding point, and a first shorting point wherein a long current path is created in the first strip such that the antenna can operate in a first low frequency operating mode, and a shorting current path is created in the second strip such that the antenna can operate in a second high frequency operating mode; a secondary radiating member comprising a second shorting point; a branch line shorting strip having one grounded end and a bifurcation including a first branch connected to the first shorting point and a second branch connected to the second shorting point; and a feeding member interconnected the feeding point and a signal source. Operating frequencies of the antenna are 90 MHz and 300 MHz respectively when it operates in 3.5:1 VSWR impedance bandwidth.

The invention is directed to a system for electromagnetic communications that includes a semiconductor die; at least one amplifier on the die to amplify an input signal and generate an output signal; and an active bias control component on the die for adjusting biasing of the amplifier so that the amplifier is operable in a plurality of frequency bands. In one embodiment, a PCS band and W-CDMA power amplifier may be integrated on the same power amplifier die, and different output power requirements may be addressed by the use of an Si DC-DC converter. Such a converter may provide efficiency enhancements to the overall system through the use of dynamic bias control under active power control situations from the network. In addition, the converter may be used in a voltage up-converter state that allows a W-CDMA optimized power amplifier to operate at PCS frequencies and output power levels.

A dedicated device and method for connecting between a packet-data-capable wireless modem and a high sensitivity indoor-capable Global Positioning System (GPS) receiver, and is able to access a commercially available cellular or PCS band wireless Internet network for supplying indoor and outdoor GPS locations to a designated remote Internet server, in an independent, periodic, and automatic manner. Implemented with TCP/IP UDP PPP protocol stacks, the device automatically accesses and retries for always connecting to the wireless Internet network in packet data mode. The device also automatically retrieves the aiding/assisted-GPS (A-GPS) information from either a wireless base station or a specified separate A-GPS server. The device periodically supplies the A-GPS information and receives the indoor-capable GPS locations, to and from the GPS receiver. The indoor-capable GPS locations are packed into Internet User Datagram Protocol (UDP) packet data format and periodically sent to a designated remote server through the wireless Internet network.

An antenna device is provided which is capable of operating in a wider band of frequencies (in a plurality of transmitting and receiving frequency bands), achieving an excellent gain, maintaining non-directivity of vertically polarized waves in each of the transmitting and receiving frequency bands, and saving space. The antenna device includes the first antenna 101 being a chip-type antenna operating in a GSM band, second antenna 102 being a pattern antenna operating in DCS and PCS bands, third antenna 103 being a layer-stacked antenna operating in an UMTS band, all being mounted on a substrate 100. The second antenna 102 is connected to a line 105 extending from a power feeding port 104 connected to the first antenna 101. A gap is interposed between the second antenna 102 and third antenna 103 wherein the second antenna 102 is capacitively coupled to the third antenna 103 on the substrate 100 with no antenna switch being provided.

A retractable whip antenna incorporating a matching base loading helix for use in mobile communications devices is disclosed. The antenna functions without the use of a matching circuit since selection of the radiating elements provides a constant input impedance to the transceiver circuitry. The resulting antenna provides excellent gain over the PCS frequency band, low SAR values, circuit design flexibility and low cost. In a preferred embodiment, the retractable whip is comprised of a radiating element with an electrical length of +E,fra 1/2+EE wavelength and having a first end attached to a conductive spring contact. The base loading helix comprises a radiating helical element with an electrical length of +E,fra 1/4+EE wavelength and having a first end connected to a mobile transceiver circuit and a second end comprising a conductive capturing coil. The radiating whip element is constrained within the coil of the helical element and is freely moveable to an extended or a retracted position. When the whip element is in the retracted position, the whip element is disconnected from the radiating circuit. When the whip element is in an extended position, an electrical connection is formed via contact between the conductive spring contact and the conductive capturing coil, wherein the helical element effectively base loads the whip element so that the two radiating elements have a combined electrical length of +E,fra 3/4+EE wavelength.

The invention relates to a shunt-type omnidirectional antenna array of three frequency bands of GSM (Global System for Mobile Communications) 850/DCS (Distributed Control System)/PCS (Personal Communication Service), belonging to the field of antenna designs. The antenna array is a three-frequency-band base station system used for supporting the GSM 850 (824-894MHz), the DCS (1,710-1,880MHz) and the PCS (1,850-1,990MHz) and has the advantages of miniaturization, omnidirectional coverage rate, low cost and high gain. The antenna array is characterized in that parallel feed networks are adoptedin parallel dual feed structures of both the front side and the back side of a printed circuit board, and the adopted parallel feed network can ensure all antenna array elements are excited in the same direction on the premise of no any phase shift, thereby the problem that a series-fed type array bandwidth is limited by the feed networks is solved. Meanwhile, a three-frequency-band omnidirectional array element is designed in a mode of chamfering a printed dipole, and a microstrip short-circuit line is connected to compensate the capacitive impedance of the DCS/PCS frequency bands, thus the high-gain omnidirectional base station antenna of three frequency bands of GSM 850/DCS/PCS is realized. The antenna array has the advantages of compact structure, miniaturization, easy integration andflexible design and is suitable for the design of a miniature multi-frequency-band high-gain base station antenna of a GSM 850/DCS/PCS system.

The invention is a device for multiband, multi-channel, wireless communications that automatically provides signal amplification when necessary, and that automatically avoids harmful interference to base stations and other parts of the communications infrastructure. The device is especially suitable for, but not limited to, cellular and PCS bands and channels. The invention is a unique combination of a bidirectional amplifier, a GPS receiver, a processor, and a removable, updatable memory. The memory stores comprehensive information that determines if amplification is necessary at a particular location sensed by the GPS receiver. Because the memory is removable and updatable, it therefore provides protection against piracy and unauthorized and improper use.

There is provided a mobile communication terminal supporting S-GPS (Simultaneous Global Positioning System) which has a controller, a keypad, a display unit, an audio processor, a memory unit, and an RF transceiver, the mobile communication terminal including: a wideband antenna which receives a CDMA-band signal, a PCS-band signal, and a GPS-band signal; a GPS antenna which receives only a GPS-band signal; and a switching unit which switches to connect the wideband antenna or the GPS antenna to a GPS receiver according to a control signal so that a GPS signal can be received via the wideband antenna or the GPS antenna.

A system that effectuates receive diversity within a mobile communication device is provided. A first antenna facilitates reception of signals in a PCS band, and a second antenna facilitates reception of signals in a GPS band and a PCS band. Tuning of the second antenna depends upon a signal type relayed to the second antenna.

A mobile communication system has a multi-band antenna capable of receiving and processing signals of GPS, CDMA, and PCS bands. In the system, a GPS processing section receives a signal of a first frequency band, so as to generate global positioning information. A communication signal processing section receives signals of a second frequency band lower than the first frequency band and a third frequency band higher than the first frequency band, demodulates the received signals. A multi-band antenna receives and transmits signals of multiple frequency bands including the first to third frequency bands. A frequency band separator section connected between the multi-band antenna and the GPS processing section and communication processing section supplies the signal of the first frequency band to the GPS processing section. A control section controls the GPS processing section and the communication processing section.

Based on current mobile phone structure, a mixer, an oscillator and a filter are added into reception end of mobile phone to make signal of wireless video cameral transfer to reception frequency channel, like GSM, CSC or PCS frequency channel. The frequency conversion signals can be processed as signals of mobile phone, and is directly inputted into fundamental frequency processor. The frequency channel used by wireless video cameral is scanned and analyzed by mobile phone to detect if the wireless video cameral is in working.

A dedicated device and method for connecting between a packet-data-capable wireless modem and a high sensitivity indoor-capable Global Positioning System (GPS) receiver, and is able to access a commercially available cellular or PCS band wireless Internet network for supplying indoor and outdoor GPS locations to a designated remote Internet server, in an independent, periodic, and automatic manner. Implemented with TCP/IP UDP PPP protocol stacks, the device automatically accesses and retries for always connecting to the wireless Internet network in packet data mode. The device also automatically retrieves the aiding/assisted-GPS (A-GPS) information from either a wireless base station or a specified separate A-GPS server. The device periodically supplies the A-GPS information and receives the indoor-capable GPS locations, to and from the GPS receiver. The indoor-capable GPS locations are packed into Internet User Datagram Protocol (UDP) packet data format and periodically sent to a designated remote server through the wireless Internet network.

An apparatus (100) includes an antenna (102) (e.g., a monopole antenna), a first load (110), and a second load (112). The antenna (102), which extends substantially along an axis (103), has a first end (104) and a second end (106). The first load (110) is coupled to the antenna at the first end (104), while the second load (112) is coupled to the antenna (102) between the first end (104) and the second end (106). Both the first and second loads (110, 112) are symmetrical with reference to the axis. The apparatus is arranged to operate in at least two frequency bands, such as the Advanced Mobile Phone System (AMPS) band from about 824 MHz to about 894 MHz and the Personal Communications Service (PCS) band from about 1850 MHz to about 1990 MHz.