Passive double-ring identifying card for circularly polarized linear antenna

Abstract

The present invention relates to electronic recognizer, and is especially passive double-ring circularly polarized linear antenna identifying card. It consists of double ring, phase shift matching microstrip line, passive microwave reflecting modulator, substrate with cuts and grain carving reginos. The identifying card has simple structure, easy manufacture, convenient use, great memory capacity, frequency band width up to 13% and identifying distance up to 10 m, and can be used widely in railway and highway vehicle management, aviation cargo transport, intelligent traffic system, logistics management, and other fields.

Description

technical field [0001] The invention relates to an electronic identification device, in particular to a passive double-ring circularly polarized linear antenna identification card related to passive reflection modulation technology, microwave theory and technology, microstrip antenna and transmission line matching technology. Background technique [0002] The active identification card in the prior art requires an external lithium battery to supply energy. When the battery is dead or fails, it needs to be sent back to the manufacturer for charging and replacement. Maintenance is inconvenient and costly, and waste lithium batteries pollute the environment. In addition, the active card has a complex structure and a large volume. In practical applications, the rate of missed recognition and false recognition is high. [0003] Chinese patent application number: 01128898.1 discloses a radio frequency passive anti-tamper identification card. Compared with the existing passive ele...

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Problems solved by technology

[0003] Chinese patent application number: 01128898.1 discloses a radio frequency passive anti-tamper identification card. Compared with the existing passive electronic identification card, the communication distance is increased and the bandwidth is increased, but the manufacturing process is relatively complicated and the cost is high. In particular, it is necessary to add a vacuum metal coating process to the substrate coating, and the mass production process will cause environmental pollution

[0004] Chinese patent application number: 97202777.7 discloses an electronic label, which solves the technical problem that wireless data transmission is sensitive to clock frequency, but its manufacturing process is relatively complicated, the storage capacity of the label is only 128bit, the storage identification data is limited, and the scope of application is limited. greater constraints

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