| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio direction detector that can detect an arrival direction of electric waves with a simple hardware and can be miniaturized. SOLUTION: The radio direction detector comprises two nondirectional antennas 1 and 11 arranged separately from each other so that phase difference of electric waves input into respective nondirectional antenna ends becomes 90°or less at the frequency of the detected electric wave, and a phase apparatus 5 for delaying the phase of only one of electric waves input by two nondirectional antennas. The delayed phase and interval between the antennas are set at values so that the value by adding the phases of electric waves input into two antenna ends to a phase value delayed by a circuit for delaying phase and the value by subtracting the phases of the electric waves input into two antenna ends from the phase value delayed by the circuit for delaying phase are simultaneously fulfilled in the range of 0-180°, or in the range at every 180°such as 180°-360°. COPYRIGHT: (C)2007,JPO&INPIT
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