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A circularly polarized patch antenna is proposed to operate at 902-928 MHz for Radio Frequency Identification (RFID) reader applications. The antenna is composed of a U-shaped strip and a square patch with truncated corners. By means of the U-shaped strip feed technique, the VSWR of the patch antenna is less than 1.2. In addition, the structure of the proposed antenna is simple and low-cost. Simulation...
In this paper, we present the design of a low-profile planar microstrip patch-type UHF RFID tag antenna that is mountable on metallic surfaces. In this design, the size of antenna has been emphasized to be limited within a standard 4" x 2" size. This novel antenna structure does not require any shorting plate or via hole, so it is suitable for fabrication using the current RFID tag manufacturing...
A compact and reusable platform-tolerant RFID tag antenna with a novel feed method is proposed. The radiator of this antenna consists of a pair of shorted patches, which can be seen as cavity-backed slot antenna or two PIFA antennas. A small loop pasted on paper is used to connect to RFID chip. With the loop size changing, the input impedance of the antenna can be easily adjusted to match all kinds...
A low-cost, wideband antenna for radio frequency identification (RFID) tags mountable on metallic surfaces is presented. A novel proximity-coupled feed structure, in which the direction of the microstrip feedline is parallel to that of the resonant length of the radiating patch and one end of the feedline is shorted to the ground, is proposed to perform simple and wideband impedance matching between...
A small UHF band RFID tag antenna using ceramic material mountable on metallic surfaces is presented. The size of the proposed tag is 25 mm times 25 mm times 3 mm. The impedance of the antenna can be easily matched to the complex conjugate of the tag chip impedance by adjusting the size of the feed loop and the shorting plate of the side patch or the position of the feed loop. The maximum reading...
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