Method and apparatus for eliminating transmission blind spot of spacial electric wave

Abstract

The invention is about methods and devices for eliminating blind spots of radio wave transmission. When the electronic tag is a UHF RFID reader remote launch wave of news, or similar position, the reader sends 0degree or 90degree signal, which signal the launch of 90degree phase transformation. The original peak signal changed into a trough point and with sufficient energy labeling and access can be read by the reader. The device with remote UHF RFID reader signal to the transmitter will have a vibration signal of the 0degree and 90degree 2-output phase transformation circuit, the circuit with a choice of 0degree or 90degree signal RF switch connects MCU. The invention changed through the initiative launched wave correspondents or similar positions phase to enable electronic access to sufficient energy labels and can be read by reader.

Description

【Technical field】 [0001] The invention relates to the field of communication technology, in particular to a method and device for eliminating blind spots in space radio wave transmission so that the tag reading range of an ultra-high frequency long-distance radio frequency identification reader can be covered in all directions. 【Background technique】 [0002] In wireless communication, due to the existence of stagnation points in units of integer multiples of half-wavelength in the process of electromagnetic waves propagating in space, at these stagnation points and their vicinity, the strength of the signal is 0 or very weak, making it difficult to read and write at ultra-high frequencies. When the device performs electronic tag identification, it will be troubled by the stagnation point of electromagnetic waves. If the electronic tag is just at the stagnation point of the reader-writer's emission wave or at a similar position, the energy received by the tag is too weak to ...

AI Technical Summary

Problems solved by technology

If the electronic tag is just at the stagnation point of the reader-writer's emission wave or at a similar position, the energy received by the tag is too weak to activate itself, thus forming a blind spot for tag reading and affecting the coverage of the signal Range and Accuracy of Signal Reading

So far, the above-mentioned problems involved in the existing UHF reader generally have not been solved

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