Estimation of the Space Resolving Ability of Open Coaxial UHF Sensor

Theoretical analysis of the microwave sensor spatial resolution is presented. The sensor is an open coaxial aperture. It allows you to concentrate the electromagnetic field in a small area that is significantly less than the wavelength. This allows using it as a sensor of nano-objects. Such a sensor can operate in a wide frequency range. This increases information efficiency in indirect measurements. A rigorous analytical model can be created for it. The solution of the problem is based on an analytical description of the fields in the working area of such a sensor using an existing model. Based on the analysis of the field distribution in the working area, factors that influence resolution are identified. The presented results show that the axial and radial spatial resolution of the OCS depends on the minimum dimensions of the elements forming the aperture. The results of calculations of the components of the electromagnetic field in the working area of the sensor are discussed.