| 摘要 |
PURPOSE:To adopt a broad band antenna for the radio telephone set and to use the antenna in common use for a microphone transmission line. CONSTITUTION:Adjacent ends 21a, 22a; 21b, 22b of conductor wires 21, 22 whose length is lambda/4 arranged in parallel close to each other are connected respectively via capacitors C20 to C22 of a prescribed capacitance. One end 23o to 26o of a lambda/4 stub 23 to 26 is connected respectively to each end of the conductor wires and the other ends of each stub are connected via a capacitor 23 to C26 of a prescribed capacitance. Each one-side end of the lambda/4 stubs is open at a high frequency region and both ends of the two conductor wires each are short- circuited to form a single large diametrical conductor equivalently and then the characteristic of the antenna 20 is made broad. In a voice frequency region, the entire capacitors are open and a voice signal from a microphone 11 is sent through the two conductor wires.
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