Low/high frequency shared leakage antenna, base station apparatus and close-range detection system using the antenna
First Claim
1. A low/high frequency shared leakage antenna comprising:
- a high-frequency leakage coaxial cable having an inner conductor and an outer conductor;
a termination circuit that terminates the inner conductor and the outer conductor in impedance at one end of the high-frequency leakage coaxial cable; and
a loop structure of a conductor line that is arranged near the high-frequency leakage coaxial cable while being in parallel therewith to perform a communication of low-frequency signals,wherein a communication of high-frequency signals higher in frequency than the low-frequency signals is performed through the high-frequency leakage coaxial cable, andwherein the sensitivity of effective sensitivity areas for the low-frequency signals is reduced by the loop structure to allow electromagnetic waves of the low-frequency signals to locally exist around the loop structure.
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Abstract
The present invention provides a high/low frequency dual wireless location detection and information transmission system which is high in reliability and maintainability, and can be easily installed.
A leakage coaxial inner conductor and a conductor line provided in parallel are short-circuited at an end, a single leakage coaxial operation and a loop operation of the inner conductor and the conductor line are performed at the same time, the ID of a tag is communicated using magnetic fields which locally exist near the conductor line by the loop, and wireless position detection and information communications which are less affected by the influence of ambient environments due to electromagnetic waves in a closed area are realized by open-type lines.
226 Citations
20 Claims
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1. A low/high frequency shared leakage antenna comprising:
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a high-frequency leakage coaxial cable having an inner conductor and an outer conductor; a termination circuit that terminates the inner conductor and the outer conductor in impedance at one end of the high-frequency leakage coaxial cable; and a loop structure of a conductor line that is arranged near the high-frequency leakage coaxial cable while being in parallel therewith to perform a communication of low-frequency signals, wherein a communication of high-frequency signals higher in frequency than the low-frequency signals is performed through the high-frequency leakage coaxial cable, and wherein the sensitivity of effective sensitivity areas for the low-frequency signals is reduced by the loop structure to allow electromagnetic waves of the low-frequency signals to locally exist around the loop structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A base station apparatus including a communication device and a low/high frequency shared leakage antenna,
wherein the low/high frequency shared leakage antenna comprises: -
a high-frequency leakage coaxial cable having an inner conductor and an outer conductor; a termination circuit that terminates the inner conductor and the outer conductor in impedance at one end of the high-frequency leakage coaxial cable; and a loop structure of a conductor line that is arranged near the high-frequency leakage coaxial cable while being in parallel therewith to perform a communication of low-frequency signals using the communication device, wherein a communication of high-frequency signals higher in frequency than the low-frequency signals is performed using the communication device through the high-frequency leakage coaxial cable; and wherein the sensitivity of effective sensitivity areas for the low-frequency signals is reduced by the loop structure to allow electromagnetic waves of the low-frequency signals to locally exist around the loop structure. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A close-range detection system comprising:
- a base station apparatus having a communication device and a low/high frequency shared leakage antenna;
a central control apparatus; and
a wireless tag,wherein the communication device includes a low-frequency communication device which communicates low-frequency signals and a high-frequency communication device which communicates high-frequency signals higher than that of the low-frequency communication device; wherein the low/high frequency shared leakage antenna comprises; a high-frequency leakage coaxial cable having an inner conductor and an outer conductor; a termination circuit that terminates the inner conductor and the outer conductor in impedance at one end of the high-frequency leakage coaxial cable; and a loop structure that is formed of a conductor line arranged near the high-frequency leakage coaxial cable while being in parallel therewith; wherein a part of the loop structure is shared with either of the inner conductor and the outer conductor of the high-frequency leakage coaxial cable; wherein the low/high frequency shared leakage antenna has a three-conductor structure formed of the high-frequency leakage coaxial cable and the conductor line of the loop structure; wherein the wireless tag includes an antenna sensitive to the high-frequency signals and the low-frequency signals, a high-frequency receiver circuit, and a low-frequency receiver circuit; wherein the central control apparatus reduces the sensitivity of effective sensitivity areas for the low-frequency signals with the loop structure of the low/high frequency shared leakage antenna to allow electromagnetic waves of the low-frequency signals to locally exist around the low/high frequency shared leakage antenna; and wherein the position of the wireless tag near the low/high frequency shared leakage antenna is detected using the low-frequency signals of the communication device, and wherein information communications with the wireless tag are performed using the high-frequency signals. - View Dependent Claims (17, 18, 19, 20)
- a base station apparatus having a communication device and a low/high frequency shared leakage antenna;
Specification