Extra-activity perturbation method for the measurement of dielectric resonator materials

Erhu Ni; Yuqing Ni
June 1997
Review of Scientific Instruments;Jun97, Vol. 68 Issue 6, p2524
Academic Journal
Presents an extra-cavity perturbation method to determine the complex permittivity of a high dielectric constant materials from measurements of frequency shift and change in the Q factor of the cavity. Insertion of a sample into an evanescent guide outside the cylindrical cavity resonator; Fundamental principles and the optimum sensitivity and accuracy of the measurements.


Related Articles

  • New approach of measuring the Q factor of a microwave cavity using the cavity perturbation technique. Subramanian, V.; Sobhanadri, J. // Review of Scientific Instruments;Feb1994, Vol. 65 Issue 2, p453 

    A new approach of measuring the quality factor of the reflection type microwave cavity resonator for calculating the complex dielectric permittivity of solid and liquid samples in the cavity perturbation technique is proposed. This approach, based on the measurement of reflected power from the...

  • Improvement of cylindrical microwave cavities using a TE01n mode. Iddings, C. K. // Review of Scientific Instruments;Aug1986, Vol. 57 Issue 8, p1593 

    The usual cylindrical microwave cavity for the TE[sub 011] mode has sidewalls made ora closely spaced helix of enameled magnet wire. This wirewound construction splits off the degenerate, low Q, TM[sub 111] mode and thus raises the effective cavity Q. We propose a cavity design which, in...

  • Formation of a spall cavity in a dielectric during electrical explosion. Burkin, V.; Kuznetsova, N.; Lopatin, V. // Journal of Applied Mechanics & Technical Physics;Jan2010, Vol. 51 Issue 1, p137 

    The wave dynamics of the stress-strain state of a solid dielectric during electrical explosion near its surface is analyzed. A quantitative model of an electrical explosion is developed which describes the operation of a high-voltage generator, the expansion of the discharge channel, and the...

  • Microwave measurement of the permittivity for high dielectric constant materials using an extra-cavity evanescent waveguide. Ni, Erhu; Jiang, Xing // Review of Scientific Instruments;Nov2002, Vol. 73 Issue 11, p3997 

    This article is concerned to a TE[sub 01n] mode resonant cavity coupled through a hole located in the center of the end wall to a cylindrical waveguide (equal in diameter to hole) supporting the evanescent TE[sub 01] mode. When the evanescent guide contains a dielectric sample, propagation of...

  • Multi-mode, multi-bunch dielectric wake field resonator accelerator. Marshall, T. C.; Fang, J-M.; Hirshfield, J. L.; Park, S-Y. // AIP Conference Proceedings;2001, Vol. 569 Issue 1, p316 

    We describe a multi-mode, dielectric-lined cylindrical resonator equipped with end reflectors in which wake fields are built up by a sequence of compact drive bunches. The parameters of the resonator are chosen such that the period of the wake fields is the same as the spacing of the drive...

  • Enhanced ESR sensitivity using a dielectric resonator. Walsh, W. M.; Rupp, L. W. // Review of Scientific Instruments;Sep86, Vol. 57 Issue 9, p2278 

    Miniaturized TE011 resonators using cylinders of commercial high dielectric constant materials yield up to 30×ESR sensitivity improvements for small samples.

  • Low-loss materials for high Q-factor Bragg reflector resonators. le Floch, Jean-Michel; Tobar, Michael E.; Cros, Dominique; Krupka, Jerzy // Applied Physics Letters;1/21/2008, Vol. 92 Issue 3, p032901 

    A Bragg resonator uses dielectric plates within a metallic cavity to confine the energy within a central free space region. The importance of the permittivity is shown with a better Q factor possible using higher permittivity materials of larger intrinsic dielectric losses. This is because the...

  • A Novel Technique to Measure Small Dielectric Losses Using Cylindrical Cavity Resonator at X Band. Mondal, Sanjay; Biswas, Salil Kumar // Journal of Microwave Power & Electromagnetic Energy;2015, Vol. 49 Issue 4, p207 

    A technique has been designed to determine the relative permittivity and dielectric loss of low loss materials using a cylindrical cavity resonator at X band. This technique has been tested over some standard materials with satisfactory results compared to some existing standard methods for...

  • Complex permittivity measurements using cavity perturbation technique with substrate integrated waveguide cavities. Lobato-Morales, Humberto; Corona-Chávez, Alonso; Murthy, D. V. B.; Olvera-Cervantes, José L. // Review of Scientific Instruments;Jun2010, Vol. 81 Issue 6, p064704 

    Cavity perturbation technique is widely used in the measurements of complex dielectric permittivity of materials due to its accuracy and ease of configuration. This paper presents the theoretical formulas for the evaluation of complex permittivity of materials using cavity perturbation technique...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics