Spreadtrum Communications (Shanghai) Co., Ltd.

Spreadtrum Communications Corporation

Wulin Shi

Ruzhong Liu

Zhongping Sun

Wentao Huang

Guotao Zhao

Bei Ni

Feng Tao

Frank Xiaohui Li

The present invention relates to the communication technology field, more specifically, to a scheme of bilateral antenna. A device for improving the stray isolation between the antennas in the bilateral antenna comprises a plurality of communication modules having an antenna and a power amplification module; at least one of the communication modules further comprises a tuning module. The power amplification module is connected to the antenna directly or through the tuning module. The stray isolation between the communication module and other communication module is improved by adjusting the communication modules comprising the tuning module. This invention increases the stray isolation between the communication modules in different frequency bands, specifically, when a long interval exits between working frequency bands. Consequently, the radiance performance of the bilateral antenna of the mobile termination is satisfied, and the capacity of resisting disturbance between the systems is enhanced.

Device for improving the stray isolation between the antennas in the bilateral antenna and the method thereof

The present invention discloses a multi-mode signal transmission system and the transmission method thereof. The system comprises a transmitter, a selection device, a compensation device, and power amplifier modules. The transmitter comprises a Ramp Circuit connected to the transmitter and the power amplifier modules respectively. The selection device is configured between the transmitter and the power amplifier modules. The transmission method comprises: selecting a transmission module by the transmitter for transmitting the signal, the selection device strobes a transmission route between the transmission module and the power amplifier modules, and based on different transmission power parameters, the Ramp Circuit transmits different control signals to the power amplifier modules to adjust transmission gain of the power amplifier modules. The present invention has the purpose of improving the integration level of the chip and decreasing the board area and the difficulty of wiring.

Method and system for multi-mode signal transmission

A printed circuit board (PCB) including a notch filter, or other suitable filter, is implemented in a communication device for attenuating RFI in transmissions sent from the communication device. The filter includes filter line that runs between at least two conductor layers on the PCB, in a substantially repeating pattern, which maximizes the space available on each conductor layer for additional uses.

Printed circuit board including a notch filter for attenuating radio frequency interference

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Shanghai, China

Wulin Shi