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Carrier jamming restraining device of radio frequency identification reader-writer

A carrier interference and radio frequency identification technology, applied in the direction of cooperating devices, instruments, computer parts, etc., can solve the blockage of the receiving channel, the inability to correctly solve the echo information, and the limited ability to eliminate or cancel the carrier signal of the reader, etc. problem, to achieve the effect of improving sensitivity

Inactive Publication Date: 2015-03-25
上海上大鼎正软件股份有限公司
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AI Technical Summary

Problems solved by technology

If it is directly amplified after entering the receiving channel, it will exceed the dynamic range of the receiver, causing the receiving channel to be blocked, and the echo information cannot be correctly resolved. The ability to eliminate or offset the carrier signal of the reader is limited, and it is difficult to achieve the maximum sensitivity.

Method used

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  • Carrier jamming restraining device of radio frequency identification reader-writer

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Embodiment Construction

[0014] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] The reference signs and components involved in the accompanying drawings are as follows:

[0016] 101. Antenna 102. Circulator 103. Combiner 104. Power Amplifier

[0017] 105. Low Noise Amplifier 106. Adjustable Gain Amplifier 107. Multiplier

[0018] 108. Directional Coupler 109. Phase Splitter 110. Digital to Analog Converter

[0019] 111. Local Oscillator 112. Low Pass Filter 113. Analog to Digital Converter

[0020] 114. Baseband sending signal unit 115. Baseband signal decoding unit

[0021] 116. Baseband approximate phase amplitude calculation unit 117. Baseband phase fine-tuning unit.

[0022] as attached figure 1 Shown: a radio frequency identification reader carrier interference suppression device, including antenna 101, circulator 102, combiner 103, power amplifier 104, low noise amplifier 105, adjustable gai...

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Abstract

The invention relates to a carrier jamming restraining device of a radio frequency identification reader-writer. The carrier jamming restraining device of the radio frequency identification reader-writer comprises an antenna, a circulator, a combiner, a power amplifier, a low-noise amplifier, an adjustable gain amplifier, a multiplying unit, a directional coupler, a phase splitter, a digital-to-analog converter, a local oscillator, a low-pass filter, an analog-to-digital converter, a base band signal sending unit, a base band signal decoding unit, a base band approximation phase position amplitude calculation unit and a fine base band phase position adjusting unit. The carrier jamming restraining device of the radio frequency identification reader-writer has the advantages that a carrier counteraction loop is designed, leaked carriers are effectively isolated, received signals and sent signals are effectively separated, and the sensitivity of the reader-writer is improved.

Description

【Technical field】 [0001] The invention relates to the field of devices for reducing interference of a radio frequency identification reader, in particular to a carrier interference suppression device for a radio frequency identification reader. 【Background technique】 [0002] Radio frequency identification technology is an identification technology that uses space-propagated electromagnetic waves for data exchange. The RFID system mainly consists of readers and tags. Readers obtain information by identifying tags. Depending on the type of tag, the recognition distance is also different. [0003] There are two types of existing tags: active tags and passive tags. Among them, passive tags are widely used due to their low cost and small size. However, because it communicates by reflecting and modulating the carrier wave of the reader, it has the following disadvantages: [0004] The reader cannot send a perfect tone, and it is phase noise for the receiving carrier, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K17/00
Inventor 刘春江冯汉炯张真铭张译元
Owner 上海上大鼎正软件股份有限公司
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