A New Dual-Band Resonator in Measuring Dielectric Constant at 5G Frequency Band and Yagi Antenna Implemented

Dielectric constant (Dk) is an important factor for engineers to design circuits previously by simulation tool. In this paper, we design a dual-band resonator to extract the dielectric constant of material at 5G frequency band – 28GHz and 39GHz, which provide designer more precise factor and simulation result with measurement. The resonator is designed in 6mm x 3.5mm x 0.15mm (L x W x H) and the result shows -1.7% frequency shifted at 28GHz and -3.1% at 39GHz between measurement and design. Then it can get the realistic Dk by matching the resonator frequency of measurement with actual size and Dk adjustment. Finally, we design a 1x4 Yagi-antenna array at 28GHz frequency band with the same Dk enactment. It shows a good correlation and the result achieves a bandwidth of 10.2GHz for -10 dB return loss and gain of 13.3 dBi.