Abstract: A microphone includes an outer casing, a carrier disposed in the outer casing, and a sound receiving module connected to the carrier. The carrier has a through hole opposite to the sound receiving module. An airtight unit includes a shock absorber and an airtight member cooperating with the outer casing and the carrier to define an airtight back chamber configured to generate a pneumatic wave when a mechanical vibration wave is transmitted to the outer casing. A damping material closes the through hole and is configured to change the phase of the pneumatic wave when the latter passes therethrough such that the pneumatic wave and the mechanical vibration wave can offset each other when they are transmitted to the sound receiving module.

Abstract: A microphone includes an outer casing, a carrier disposed in the outer casing, and a sound receiving module connected to the carrier. The carrier has a through hole opposite to the sound receiving module. An airtight unit includes a shock absorber and an airtight member cooperating with the outer casing and the carrier to define an airtight back chamber configured to generate a pneumatic wave when a mechanical vibration wave is transmitted to the outer casing. A damping material closes the through hole and is configured to change the phase of the pneumatic wave when the latter passes therethrough such that the pneumatic wave and the mechanical vibration wave can offset each other when they are transmitted to the sound receiving module.

Abstract: Method for performing dynamic impedance matching and communication apparatus thereof are provided. With respect to an operating band of an impedance matching circuit of a communication device, a first number of times of tuning are performed on a first element of an impedance matching circuit, and a second number of times of tuning are performed on a second element of the impedance matching circuit, wherein the first number is different from the second number.

Abstract: An antenna control circuit and a corresponding antenna control method are provided. The antenna control circuit includes an antenna and a diode. An anode of the diode is coupled to the antenna. A cathode of the diode is grounded. The anode receives a negative voltage when the antenna receives an alternating current (AC) voltage signal. The antenna control circuit and the antenna control method can increase antenna bandwidth by switching the diode. In addition, the antenna control circuit and the antenna control method can provide better radiation efficiency.

Abstract: Method for performing dynamic impedance matching and communication apparatus thereof are provided. With respect to an operating band of an impedance matching circuit of a communication device, a first number of times of tuning are performed on a first element of an impedance matching circuit, and a second number of times of tuning are performed on a second element of the impedance matching circuit, wherein the first number is different from the second number.

Abstract: Method for performing dynamic impedance matching and communication apparatus thereof are provided. With respect to an operating band of an impedance matching circuit of a communication device, a first number of times of tuning are performed on a first element of an impedance matching circuit, and a second number of times of tuning are performed on a second element of the impedance matching circuit, wherein the first number is different from the second number.

Abstract: A mobile communication device and an impedance matching method thereof are provided. The mobile communication device includes an antenna, a power amplifier, a tunable matching circuit, a power detection circuit and a controller. The tunable matching circuit determines an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit. The power detection circuit detects a forward power of the RF signal entering the antenna and a reflected power of the antenna. The controller tunes the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range.

Abstract: A radio-frequency (RF) processing device, for a wireless communication device, is disclosed. The RF processing device comprises an antenna, an RF-signal processing module, a controller, for generating a control signal according to a band switching signal, and a matching adjustment module for adjusting an impedance between the antenna and the RF-signal processing module according to the control signal.

Abstract: A mobile communication device and an impedance matching method thereof are provided. The mobile communication device includes an antenna, a power amplifier, a tunable matching circuit, a power detection circuit and a controller. The tunable matching circuit determines an output impedance encountered by a radio frequency (RF) signal transmitted by the power amplifier to the antenna when the RF signal enters the tunable matching circuit. The power detection circuit detects a forward power of the RF signal entering the antenna and a reflected power of the antenna. The controller tunes the tunable matching circuit according to a frequency range currently used by the mobile communication device, the forward power and the reflected power to steer the output impedance toward a corresponding load-pull impedance that the power amplifier has in the frequency range.

Abstract: Method for performing dynamic impedance matching and communication apparatus thereof are provided. With respect to an operating band of an impedance matching circuit of a communication device, a first number of times of tuning are performed on a first element of an impedance matching circuit, and a second number of times of tuning are performed on a second element of the impedance matching circuit, wherein the first number is different from the second number.

Abstract: A radio-frequency (RF) processing device, for a wireless communication device, is disclosed. The RF processing device comprises an antenna, an RF-signal processing module, a controller, for generating a control signal according to a band switching signal, and a matching adjustment module for adjusting an impedance between the antenna and the RF-signal processing module according to the control signal.

Abstract: A multi-frequency and multi-mode power amplifier is provided. The amplifier has a carrier power amplifier and a peaking power amplifier. The carrier power amplifier receives a first signal and outputs a first amplified signal, in which a first transistor size adjusting unit is included to adjust an equivalent transistor size based on a mode indication signal. The peaking power amplifier receives a second signal and outputs a second amplified signal, in which a second transistor size adjusting unit is included to adjust an equivalent transistor size based on the mode indication signal.

Abstract: A multi-frequency and multi-mode power amplifier is provided. The amplifier has a carrier power amplifier and a peaking power amplifier. The carrier power amplifier receives a first signal and outputs a first amplified signal, in which a first transistor size adjusting unit is included to adjust an equivalent transistor size based on a mode indication signal. The peaking power amplifier receives a second signal and outputs a second amplified signal, in which a second transistor size adjusting unit is included to adjust an equivalent transistor size based on the mode indication signal.