Symmetric gap monopole RFID (radio frequency identification) antenna adopting dual-frequency coplanar waveguide feed

A coplanar waveguide and monopole technology, applied in the field of RFID antennas, can solve the problem of difficult realization of antenna isolation, and achieve the effects of easy circuit integration, good mechanical strength, and simple production

Inactive Publication Date: 2015-04-29
成都新方洲信息技术有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

But this requires sufficient isolation between the antennas, and the requirement of small size makes the isolation between the antennas difficult to achieve

Method used

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  • Symmetric gap monopole RFID (radio frequency identification) antenna adopting dual-frequency coplanar waveguide feed

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with accompanying drawing:

[0013] Such as figure 1 As shown, the symmetrical slotted monopole RFID antenna fed by the dual-frequency coplanar waveguide of the present invention includes a copper sheet base plate 1, and a hollowed-out slit 2 is provided on the copper sheet base plate 1, and the slot 2 is formed by two copper sheet base plates. The central axis of 1 is the axis of symmetry and is composed of sub-slits (not marked in the figure) that are symmetrical to each other. The shape of each sub-slit is: the two ends of the "C"-shaped slit whose opening direction is facing the central axis are respectively bent 180° Along the central axis direction to the edge of the copper base plate 1 ( figure 1 The middle is the upper and lower edges of the copper sheet bottom plate 1) extending to the end; there is a gap between the two sub-slits, and the copper sheet bottom plate 1 in the two sub-slits and ...

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Abstract

The invention discloses a symmetric gap monopole RFID (radio frequency identification) antenna adopting dual-frequency coplanar waveguide feed. The symmetric gap monopole RFID antenna comprises a copper sheet base plate, wherein a hollow gap is formed in the copper sheet base plate and comprises more than two sub gaps which are mutually symmetric by taking the middle axial line of the copper sheet base plate as a symmetric axis; the shape of each sub gap is that the two ends of a C-shaped gap with the opening direction opposite to the middle axial line are bent at 180 degrees respectively and then extend to the edge of the copper sheet base plate in the middle axial line direction to reach the ends; a clearance is reserved between the two sub gaps; balance-shaped feed copper bands are formed in the two sub gaps and between the two sub gaps; one end of the center band of each feed copper band is connected with a port. According to the symmetric gap monopole RFID antenna, the symmetric gaps are formed in the copper band base plate, so that one part of the copper band base plate is changed into the balance-shaped feed copper band, and the symmetric gap monopole RFID antenna adopting dual-frequency coplanar waveguide feed is obtained; the antenna is easy to manufacture, high in mechanical strength, small in size, easy to integrate with a circuit and convenient for application.

Description

technical field [0001] The invention relates to an RFID antenna, in particular to a symmetrical slot monopole RFID antenna fed by a double-frequency coplanar waveguide. Background technique [0002] For the design of RFID tags and readers in the microwave frequency band, since the special RFID chips used in this frequency band are less or immature, a separate structure is often used, so that the existing microwave integrated circuits can be applied to the RFID system design, and the microwave circuit Sometimes a coaxial cable is used to connect with the antenna, and the antenna design at this time needs to match the port to the 50 ohm design. [0003] The reader multi-antenna system scheme uses one antenna for transmission and the other for reception, which can solve the problem of mutual interference between the transmitted signal and the received signal, and can realize two antennas working at the same time. However, this requires sufficient isolation between the antennas...

Claims

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Application Information

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IPC IPC(8): H01Q1/36H01Q1/22H01Q5/10H01Q13/10
Inventor 巫梦飞陈伟周卫民
Owner 成都新方洲信息技术有限公司
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