Open Resonator Technique of Non-Planar Dielectric Objects at Millimeter Wavelengths

Abstract

Abstract-This paper provides a reliable dielectric measurement theory of the open resonator for non-planar objects such as convexconcave objects. It is the first time that the complete analytical formulas of the complex permittivity are presented by means of the second-order theory of the open resonator and field matching method. Furthermore, a measurement system is designed and built at Ka band, and the consistency of the results between planar and nonplanar samples verifies the accuracy of the new theory. Finally, the experimental error analysis is investigated.

Millimeter Wave Measurement of the Low-Loss Dielectric in Vacuum Electronic Devices with Reflection-Type Hemispherical Open Resonator

“…However, with the increase of the operating frequency, the material properties, such as the permittivity and the loss-tangent, are not easy to be accurately measured. The scheme of open resonator technique has been proved to be an efficient method to obtain the dielectric performance in the microwave, millimeter wave, and even terahertz regime [4][5][6][7][8][9][10][11][12][13][14][15][16]. Many advantages are demonstrated including high Q-factor (suitable for low loss-tangent test), sparser spectral density, and larger dimensions for easy manufacture.…”

A New Open Cavity at Millimeter Wave Band for Permittivity Measurement of Dielectrics

“…Meanwhile, open cavity is also a power tool for measuring accurately complex permittivity of dielectric materials at millimeter and sub-millimeter wavelengths. How to use this technique to measure the complex permittivity of dielectric material accurately have been investigated in detail [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. All of the open cavities investigated are based on spherical mirrors or spherical and planar mirrors.…”