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In this paper, we present the improvement of optical properties of 1×8 arrayed waveguide grating (AWG) de-multiplexer by adding Transmission Star Couplers (TSC) into Free Propagation Region 1 (FPR1) which has refractive index 1.455. It is found that the appropriate value of refractive index of TSC area is 1.460. Using this method, the insertion loss of AWG decreased from 1.79 dB to 1.58 dB while the...
Effect of additive white Gaussian noise on accuracy performance of a six-port reflectometer (SPR) is presented in this paper. Three six-port circuits (sampling line, five-port ring and ideal design) calibrated with different calibration techniques (five and seven standard loads based) are investigated. Mathematical model of a SPR is developed and simulated. To evaluate the accuracy performance of...
Passive RFID is a promising technology for products tracking in logistics. However, the UHF RFID tag is greatly affected by backside goods especially metallic object. This paper describes the design of a dipole antenna with Electromagnetic Band Gap (EBG) for RFID tag, so that the tag could still work on metallic surface. The design of EBG material for UHF RFID is operated at 922 MHz and its reflection...
A new design of compact EBG resonator antenna to improve a directivity is introduced in this paper. The antenna is composed of two back-to-back folded dipoles as a feed for a resonator antenna and reflective walls. The single-resonant metallic EBG as a superstrate was designed. A highly directive radiation pattern is created due to the angle-dependent attenuation of the resonator antenna coupling...
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