Circular polarized ultra-high frequency radio-frequency identification antenna for radiating circular polarized waves, has resistor connected between strip conductor and ground, and microstrip lines connected with lines in metallic trough

摘要

The circular polarized ultra-high frequency radio-frequency identification antenna comprises a round strip conductor (1), which is arranged at a distance from a ground surface in parallel with interposition of a dielectric material and has a length of approximately lambda length. The strip conductor is fed at one end to ground and at the other end by a resistor (2). The resistor is connected between one end of the strip conductor and of the ground. Four opposite sides of the microstrip line are connected with lines, which are arranged in a metallic trough.