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Loop antenna

A loop antenna and antenna technology, applied in the field of antennas, can solve the problems of inapplicability to passive communication, large impedance, communication limitations, etc., and achieve the effects of not being able to drastically reduce the gain, reducing impedance, and improving efficiency.

Active Publication Date: 2014-12-10
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the size of the small loop antenna is greatly reduced, its impedance is very large, the gain is greatly reduced, and the communication is greatly limited, so it is basically not suitable for passive communication.

Method used

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Embodiment Construction

[0020] In order to better illustrate the technical characteristics and structure of the present invention, the following is a detailed description in conjunction with preferred embodiments of the present invention and accompanying drawings.

[0021] refer to figure 1 and figure 2 , the loop antenna provided by the present invention includes a feeder 100 and an antenna body 200, wherein the feeder 110 is provided with a feeder positive pole 110 and a feeder negative pole 120, the feeder positive pole 110 and the feeder negative pole 120 are coaxial, the feeder positive pole 110 is located inside the feeder line 100, and the feeder line The negative electrode 120 is a surrounding dielectric surrounding the positive electrode 110 of the feeder line, and forms the feeder line 100 with the positive electrode 110 of the feeder line. The antenna body 200 includes a plurality of antenna units 210 in a ring structure, and the plurality of antenna units 210 are symmetrically distribut...

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Abstract

The invention provides a loop antenna comprising a feeder and an antenna body. The feeder comprises an anode and a cathode. The antenna body comprises a plurality of antenna units in a loop structure. The antenna units are symmetrically distributed around the feeder. The antenna units are connected with the anode and the cathode respectively. The loop antenna has the advantages that the frequency characteristics and directional characteristics of small-loop antenna are inherited, the antenna units are arranged on a solid face according to angles, and impedance is changed and reduced by array characteristics, thus directionality, impedance and gaining of the small-loop antenna are improved, low impedance and guaranteed directionality are comprehensively achieved, the gaining rarely greatly decreases, the impedance problem of the small-loop antenna is solved, and efficiency is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a loop antenna for passive communication. Background technique [0002] As a component used to transmit or receive radio waves, the antenna plays a pivotal role in the wireless communication system and is an indispensable part of the wireless communication system. With the rapid development of high-frequency satellite communication systems, radar, wireless communication systems, especially the construction of global 3G and 4G networks, the requirements for antennas are getting higher and higher. On the one hand, it is necessary to enable the antenna to work in multiple frequency bands, have multiple working modes and have good transmission performance; on the other hand, it is necessary to reduce the weight of the antenna, reduce the volume of the antenna and reduce the cost. Just because of such demands, various antennas have been proposed and flourished. [0003] Loop antenn...

Claims

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Application Information

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IPC IPC(8): H01Q7/00H01Q1/36
Inventor 黄晓霞肖钟凯毛成华吕婧谈宇光
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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