Communication antenna and pole with built-in-antenna
A technology for communication antennas and antennas, applied to antennas, individually powered antenna arrays, antenna supports/mounting devices, etc., which can solve the problems of lack of antennas, increase in the cost of communication antennas, and the inability to fully ensure installation space, etc.
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[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
[0043] FIG. 1 is a block diagram of a communication antenna to which the present invention is applied. This communication antenna 1 is an antenna used in a tag communication device 3 such as an RFID reader / writer that wirelessly communicates with an RFID tag 2 via radio waves. The communication antenna 1 includes an antenna array. part 4 and variable unit 5, and the antenna array part 4 has a plurality of antenna elements 6. In addition, an arrangement structure of the plurality of antenna elements 6 will be described later.
[0044] A variable phase shifter 7 and a variable attenuator 8 constituting the above-mentioned variable unit 5 are respectively connected to each antenna element 6 , and the variable phase shifter 7 and variable attenuator 8 are connected to a control circuit 9 . The control circuit 9 changes the phase of the high-frequency si...
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