Novel MetamaterialsBased Hypersensitized Liquid Sensor Integrating OmegaShaped Resonator with Microstrip Transmission Line. In this paper, a new metamaterialsbased hypersensitized liquid sensor integrating omegashaped resonator with microstrip transmission line is proposed. Microwave transmission responses to industrial energybased liquids are investigated intensively from both numerical and experimental point of view. Simulation results concerning threedimensional electromagnetic fields have shown that the transmission coefficient of the resonator could be monitored by the magnetic coupling between the transmission line and omega resonator. This sensor structure has been examined by methanolxe2x80x93water and ethanolxe2x80x93water mixtures. Moreover, the designed sensor is demonstrated to be very sensitive for identifying clean and waste transformer oils. A linear response characteristic of shifting the resonance frequency upon the increment of chemical contentsconcentrations or changing the oil condition is observed. In addition to the high agreement of transmission coefficients (S21) between simulations and experiments, obvious resonantfrequency shift of transmission spectrum is recognized for typical pure chemical liquids (i.e., PEG 300, isopropyl alcohol, PEG1500, ammonia, and water), giving rise to identify the type and concentration of the chemical liquids. The novelty of the work is to utilize Q factor and minimum value of S21 as sensing agent in the proposed structure, which are seen to be well compatible at different frequencies ranging from 1xe2x80x9320 GHz. This metamaterial integrated transmission linebased sensor is considered to be promising candidate for precise detection of fluidics and for applications in the field of medicine and chemistry.

Design of SubstrateIntegrated Waveguide Loading Multiple Complementary Open Resonant Rings (CSRRs) for Dielectric Constant Measurement In order to solve the lowsensitivity problem of the dielectric constant with the resonant cavity method, a sensor based on a substrateintegrated waveguide structure loaded with a multicomplementary open resonant ring is proposed. With the enhanced resonance characteristics of the sensor, this design realized the measurement of complex dielectric constants in a wide range. The frequency selectivity of the sensor is improved by the highquality factor of the substrateintegrated waveguide. By loading three complementary resonant rings with different opening directions in the ground plane, a deeper notch and better outofband suppression are achieved. The effect of the complex dielectric constant on both resonant frequency and quality factor is discussed by calculating the material under test with a known dielectric constant. Simulation and experimental results show that a resonance frequency offset of 102 MHz for the per unit dielectric constant is achieved. A wide frequency offset is the prerequisite for accurate measurement. The measurement results of four plates match well with the standard values, with a relative error of the real part of the dielectric constant of less than 2% and an error of less than 0.0099 for the imaginary part.