RF circuit system and method of increasing the isolation between two wireless communications standards within an RF circuit system

摘要

An RF circuit system comprises a processing unit for generating an RF signal, a first antenna for transmitting the RF signal, a transmitting suppressor including serially connected filters between the first antenna and the processing unit for filtering the RF signal to generate multiple different suppressed RF signals, a second antenna for receiving the RF signal, and an isolation detector for measuring an isolation value representing isolation between the first and second antennae with respect to the RF signal. The transmitting suppressor outputs the RF signal when the isolation value is not smaller than a threshold, and outputs one suppressed RF signal with reference to the difference between the isolation value and the threshold when otherwise.

主权项

1. A radio frequency (RF) circuit system comprising:
a first antenna; a first RF processing unit capable of generating a first RF signal; a first transmitting suppressor including a plurality of serially connected filters that are electrically coupled between said first antenna and said first RF processing unit for receiving the first RF signal from said first RF processing unit and for filtering the first RF signal thus received to generate a plurality of different first suppressed RF signals respectively at output nodes of said filters, said first transmitting suppressor being capable of outputting one of the first RF signal and the first suppressed RF signals for subsequent transmission by said first antenna; a second antenna capable of receiving the first RF signal transmitted by said first antenna; a first isolation detector electrically coupled to said second antenna for measuring a first isolation value representing the isolation between said first and second antennae with respect to the first RF signal; and a control unit electrically coupled to said first isolation detector and said first transmitting suppressor for receiving the first isolation value and determining whether the first isolation value is not smaller than a predetermined threshold; wherein, when it is determined that the first isolation value is not smaller than the predetermined threshold, said control unit controls said first transmitting suppressor to subsequently output the first RF signal for transmission by said first antenna, and when it is determined that the first isolation value is smaller than the predetermined threshold, said control unit further determines a difference between the first isolation value and the predetermined threshold and controls said first transmitting suppressor to subsequently output, for transmission by said first antenna, the first suppressed RF signal generated at said output node of one of said filters of said first transmitting suppressor as determined by said control unit with reference to the difference between the first isolation value and the predetermined threshold.