| 摘要 |
PURPOSE: An antenna circuit is provided to allow for ease of tuning by permitting one antenna to have a transmission function and the other antenna to have a GPS/RF reception function. CONSTITUTION: An antenna circuit comprises a receiving unit connected to a receiving antenna, and which processes RF and GPS signals; a transmitting unit connected to a transmitting antenna, and which transmits RF signals; and a control unit(250) for processing the signal input from the receiving unit, generating a switching control signal for switching paths of RF and GPS signals of the receiving unit, generating RF signals, and outputting the RF signals to the transmitting unit. The receiving unit includes a first matching part(210) for matching voltage standing wave ratio such that the ratio is optimized to an RF and GPS receiving frequency; a switching part(220) connected to the first matching part, and which transmits signals to the GPS or RF signal; a GPS SAW filter(230) for filtering GPS signals input from the switching unit; a first diplexer(241) for connecting RF signals input from the switching unit to one of two paths; and a plurality of SAW filters(242,243) for filtering RF signals input from the first diplexer.
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