| 摘要 |
PURPOSE: A common switch circuit for many antennas is provided to test plural antennas through a single test RF switch by installing a switch circuit that can control a GPS path and a CDMA RF path. CONSTITUTION: A common switch circuit for plural antennas comprises the first matching part(210), a test switch(220), the first control switch(230), a duplexer(240), the second matching part(250), the second control switch(260), a signal processing part(270), and a band processing/control part(280). The first matching part(210), connected to a CDMA antenna, is to match a voltage standing wave ratio so as to be optimized to Rx/Tx frequencies. The test switch(220), connected to the first matching part(210), provides a test connection point, and transfers Rx/Tx signals. The first control switch(230) is an SPDT(Single Pole Double Throw) having a single input terminal, the first output terminal, and the second output terminal, and connects the input terminal to the first or second output terminal according to the first control signal from the band processing/control part(280). The duplexer(240), connected to the first output terminal of the first control switch(230), interactively provides the paths of Rx/Tx signals. The second matching part(250), connected to a GPS antenna, is to match a voltage standing wave ratio as to be optimized to an Rx frequency. The second control switch(260) is an SPDT having a single input terminal, the first output terminal, and the second output terminal, and connects the input terminal to the first or second output terminal according to the second control signal from the band processing/control part(280). The signal processing part(270) converts a signal inputted from the duplexer(240) into a band signal or converts a band signal into an RF signal. The band processing/control part(280) demodulates a signal inputted from the signal processing part(270), outputs a modulated signal to the signal processing part(270), and creates the first or second control signal, based on an inputted signal.
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