| 摘要 |
PURPOSE: A coupler built-in back board is provided to improve work efficiency and reduce manufacture cost by reducing RF cables and simplifying configuration of a rear of a rack. CONSTITUTION: A coupler built-in back board comprises a PCB(printed circuit board)(10), a strip line(20) and a strip line coupler(30). The PCB(10) is a multi board in a base station. The strip line(20) is patterned on the PCB(10) and replaces some parts of RF cables connected to the back board in the base station. The strip line coupler(30) is patterned to have λ/4 characteristic at one side of the strip line(20) patterned on the PCB(10). The strip line coupler(30) is formed as one side open frame and acts as a test port and a coupling port in the base station. The one side open frame strip line coupler(30) has 25 dB and 1.87 GHz frequency characteristic. The multi board of the PCB(10) separates ground for each function to avoid interference between them.
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