High-gain long-distance UHF vehicle-mounted RFID tag antenna and its installation accessories
An RFID tag and ultra-high frequency technology, which is applied in the field of high-gain long-distance ultra-high frequency vehicle-mounted RFID tag antenna and its installation accessories, can solve the problem of not being able to meet the customer's individual needs for the installation position of the tag antenna, and not being able to match the reading well In order to achieve the effects of long-distance reading, good working characteristics, and reduced size
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Embodiment 1
[0033] see figure 1 , the high-gain long-distance UHF vehicle-mounted RFID tag antenna consists of two layers of metal patch A and flexible thin layer B from top to bottom, wherein metal patch A contains tree-shaped branches A m , rectangular ring A f , parasitic structure A p and the closed structure A o constitute, characterized in that:
[0034] 1) The tree branch A m It is a tree-shaped branch structure with symmetrical ends. Tree branch structure A m The branches of are perpendicular to each other, and the width is constant;
[0035] 2) The rectangular ring A f with the tree branch A m The trunks of the two are parallel, and the two are coupled through the gap. Rectangular Ring A f Load the RFID tag chip in the center of the lower end;
[0036] 3) The tree branch A m There is a parasitic structure A above the trunk p . The parasitic structure A p It is in the shape of a "pyramid", with one or several "pentagram" structures at its top;
[0037] 4) The recta...
Embodiment 2
[0040] This embodiment is basically the same as Embodiment 1, and the special features are as follows:
[0041] 1) According to the principle of the fractal structure antenna, the smaller the angle of the tree branch structure is, the larger the bandwidth of the antenna will be, but the size of the antenna will be increased. Therefore, the tree branch structure A m The angle between each branch can be adjusted appropriately according to specific requirements;
[0042] 2) "Pentagram" can also be in other shapes.
[0043] Such as figure 2 As shown, the antenna is pasted on the front windshield of the car. Figure 3~4 The working performance of the antenna is shown as the return loss of the antenna and the pattern at two frequencies of 865 MHz and 915 MHz, respectively. The gain of the antenna in front of the vehicle is as high as 6.5dBi, and the maximum reading distance reaches more than 40 meters, which meets the gain and reading distance requirements of the vehicle-mounte...
Embodiment 3
[0045] This embodiment is basically the same as Embodiment 1, and the special features are as follows:
[0046] The antenna is pasted on the top air window of the car.
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