Abstract: An antenna module includes a plurality of antenna units, wherein one of the antenna units includes a fixed phase and the other antenna units respectively include a phase adjusted in response to the fixed phase.

Abstract: An antenna module includes a plurality of antenna units, wherein one of the antenna units includes a fixed phase and the other antenna units respectively include a phase adjusted in response to the fixed phase.

Abstract: A cavity filter includes a first layer circuit board, a second layer circuit board and a middle layer circuit board locates between the first layer circuit board and the second layer circuit board. A plurality of resonators locates on the first layer circuit board. A plurality of resonating cavities is located on the second layer circuit board one-to-one corresponding to the resonators. A slot is defined on the middle layer circuit board. The resonators traverse through the slot and are placed in the resonating cavities to form a plurality of resonating units, and the plurality of resonating couple with the slot of the middle layer circuit board.

Abstract: A cavity filter includes a first layer circuit board, a second layer circuit board and a middle layer circuit board locates between the first layer circuit board and the second layer circuit board. A plurality of resonators locates on the first layer circuit board. A plurality of resonating cavities is located on the second layer circuit board one-to-one corresponding to the resonators. A slot is defined on the middle layer circuit board. The resonators traverse through the slot and are placed in the resonating cavities to form a plurality of resonating units, and the plurality of resonating couple with the slot of the middle layer circuit board.

Abstract: A circuit for canceling a direct current (DC) offset in a communication system includes a digital-to-analog (D/A) converter assembly (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a detecting module (70), and a microcontroller (80). The D/A converter assembly converts digital DC offset regulation signals to analog DC offset regulation signals. The summing circuit sums up the DC offset regulation signals and corresponding vectors of a received base band signal. The I/Q modulator converts the summed base band signal to a radio frequency (RF) signal. The detecting module detects an energy variation due to DC offset contained in the radio frequency (RF) signal. The microcontroller regulates the DC offset regulation signals output from the D/A converter assembly to minimize the energy variation detected by the detecting module. In the invention, the circuit saves energy and enhances qualities of communication signals.

Abstract: A wireless transceiver system for compensating a transport loss includes a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after cable attenuation from the transceiver. The TMA is connected to the transceiver via a cable, receives a second signal, and amplifies the second signal. The transport loss detector is connected to the TMA, and calculates a transport loss between the transceiver and the TMA. The TMA further compensates the transport loss between the transceiver and the TMA according to the calculated result of the controller.

Abstract: A wireless transceiver system, for compensating a transport loss, includes an antenna (300), a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after the cable attenuation from the transceiver. The TMA, connected to the transceiver via a cable, receives the second signal and amplifies the second signal. The transport loss detector, connected between the TMA and the transceiver, detects a transmission state of the transceiver, and calculates a transport loss between the transceiver and the TMA. The TMA transmits signals to the antenna or receives signals from the antenna according to the detected result of the transport loss detector, and compensates the transport loss according to the calculated result of the transport loss detector.

Abstract: A system for correcting a DC offset includes a digital-to-analog (D/A) converter module (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a spectrum analyzer module (60) and a DC offset correction module (70). The D/A converter module converts digital control signals to analog control signals, and outputs DC offset regulating signals. The summing circuit respectively sums up the DC offset regulating signals and corresponding vectors of a base band signal. The I/Q modulator receives the summed base band signal, and converts the summed base band signal to a radio frequency (RF) signal. The spectrum analyzer module analyzes an energy variation according to a DC offset contained in the RF signal. The DC offset correction module outputs the digital control signals to adjust the DC offset regulating signals, thereby obtaining the lowest energy variation.

Abstract: A circuit for canceling a direct current (DC) offset in a communication system includes a digital-to-analog (D/A) converter assembly (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a detecting module (70), and a microcontroller (80). The D/A converter assembly converts digital DC offset regulation signals to analog DC offset regulation signals. The summing circuit sums up the DC offset regulation signals and corresponding vectors of a received base band signal. The I/Q modulator converts the summed base band signal to a radio frequency (RF) signal. The detecting module detects an energy variation due to DC offset contained in the radio frequency (RF) signal. The microcontroller regulates the DC offset regulation signals output from the D/A converter assembly to minimize the energy variation detected by the detecting module. In the invention, the circuit saves energy and enhances qualities of communication signals.

Abstract: A system for correcting a DC offset includes a digital-to-analog (D/A) converter module (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a spectrum analyzer module (60) and a DC offset correction module (70). The D/A converter module converts digital control signals to analog control signals, and outputs DC offset regulating signals. The summing circuit respectively sums up the DC offset regulating signals and corresponding vectors of a base band signal. The I/Q modulator receives the summed base band signal, and converts the summed base band signal to a radio frequency (RF) signal. The spectrum analyzer module analyzes an energy variation according to a DC offset contained in the RF signal. The DC offset correction module outputs the digital control signals to adjust the DC offset regulating signals, thereby obtaining the lowest energy variation.

Abstract: A wireless transceiver system, for compensating a transport loss, includes an antenna (300), a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after the cable attenuation from the transceiver. The TMA, connected to the transceiver via a cable, receives the second signal and amplifies the second signal. The transport loss detector, connected between the TMA and the transceiver, detects a transmission state of the transceiver, and calculates a transport loss between the transceiver and the TMA. The TMA transmits signals to the antenna or receives signals from the antenna according to the detected result of the transport loss detector, and compensates the transport loss according to the calculated result of the transport loss detector.

Abstract: A wireless transceiver system for compensating a transport loss includes a transceiver (100), a tower mounted amplifier (TMA) (200), and a transport loss detector (400). The transceiver transmits a first signal at a transmit power. The first signal is changed into a second signal after cable attenuation from the transceiver. The TMA is connected to the transceiver via a cable, receives a second signal, and amplifies the second signal. The transport loss detector is connected to the TMA, and calculates a transport loss between the transceiver and the TMA. The TMA further compensates the transport loss between the transceiver and the TMA according to the calculated result of the controller.