dual functional microwave sensor with high-gain array antenna using loaded U-resonator and asymmetric T-junction

This paper proposes the dual functional microwave sensor with high gain array antenna using loaded U-resonator and asymmetric T-junction. The microwave sensor is designed to operate at f_r = 2.11 GHz while the array antenna operates at f_r = 2.84 GHz which is integrated using asymmetric T-junction based on microstrip line. The performance of the sensor is observed based on the frequency shift of S₂₁ for solid material characterization with a permittivity range of 1-9.8 while for the antenna is observed based on the parameters S₁₁, bandwidth, gain and radiation pattern. From the measurement results, the antenna and sensor have high performance and have independent characteristics with high isolation of ≤ -40 dB to work concurrently. Moreover, the antenna has performance of S₁₁ ≤ -10 dB, Fractional Bandwidth (FBW) 2.11% and gain of 6.03 dBi at f_r = 2.84 GHz. The sensors operating at f_r = 2.11 GHz has a performance of ∆F of 0.4 GHz, FDR of 0.061 GHz / ∆ε_r, normalized sensitivity (NS) of 2.21% and accuracy of 99.38%. Therefore, this work can be recommended for application in industries such as material quality control, pharmaceuticals and biomedical as a solution for real-time measurement processes integrated with wireless communications.