Abstract
In this paper, we present a novel compact, coplanar, tag antenna design for metallic objects. Electrically small antenna has designed for a UHF RFID (860–960 MHz) based on a proximity-coupled feed through. Furthermore, two symmetrical Via-loaded coplanar grounds fed by a U-shaped inductively coupled feed through an embedded transmission line. This configuration results in an antenna with dimensions of 31 × 19.5 × 3.065 mm3 at 915 MHz, and the total gain for the antenna is 0.12 dBi. The Via-loaded coplanar and U-shaped inductively coupled feeds allow the antenna to provide flexible tuning in terms of antenna impedance. In addition, a figure of merit is applied for the proposed tag antenna, and the results are presented. The read range is measured to be 4.2 m, which is very close to simulated values. This antenna measurement shows very good agreement with simulations.
Highlights
RADIO frequency identification has received considerable attention in recent years because of the provided long read range and low manufacturing cost
The main goal for the ultra-high frequency (UHF) RFID tag antenna design is to decrease its size, expand its bandwidth, and enhance its gain, whereas enough budgets should be reserved for the reliability and robustness of the system
This degradation results in a significant change in antenna efficiency, which is caused by the nearby object, especially for objects composed of metallic materials [5], [6]
Summary
RADIO frequency identification has received considerable attention in recent years because of the provided long read range and low manufacturing cost. A U-shaped inductively coupled feeder was introduced to overcome the possible conjugate matching problem when a different chip will be utilized for the same designed antenna for a specific application. Shaped inductively coupled network near the transmission line and the two coplanar grounds Impedance tuning for this type of electrical small antenna is difficult to obtain. We utilize a U-shaped inductively coupled feeder with two loaded via coplanar grounds to act as the first radiator because, in designs for obtaining high efficiency, compact antenna slotting is not a valid solution [38]. The direction of the coplanar antenna is chosen toward improving the reader performance for the coplanar design, where the best method to obtain such results is by increasing the radiation efficiency when a sufficient bandwidth budget is reserved
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