The microwave autodyne Gunn oscillator as a simple detector of EPR signal for food-irradiation dosimeter

Abstract

In this paper a microwave autodyne Gunn oscillator has been presented. The oscillator may be used as a simple detector of EPR signal for irradiation-food dozynteter. The idea of EPR method of measurement of radiation dose has been described. A low-cost, simple EPR spectrometer for estimation of dose of food irradiation can be built on the basis of microwave auto+ne Gunn oscillator. The re-entrant resonator Gunn oscillator has been proposed as an attractive solution of autodyne circuit. The design expressions and the oscillator parameters have been given and the photograph oscillator elaborated has been shown.

Invited Article: Dielectric material characterization techniques and designs of high-Q resonators for applications from micro to millimeter-waves frequencies applicable at room and cryogenic temperatures

“…Development of more and more accurate structure modelling based on lumped element analysis [63][64][65][66][67] made it very valuable for making small size high-Q resonators. These are designed for filtering applications at room and cryogenic temperatures, 68,69 displacement sensors for gravitational bar detectors [70][71][72] They have also been used to develop Gunn diodes 73 oscillators, electron beam tubes, 74 and millimetre wave resonators. 75 The electromagnetic field pattern of the re-entrant cavity fundamental mode presents a very high capacitance between the internal post and the lid of the cavity, shown in Figure 5.…”

Rigorous analysis of highly tunable cylindrical transverse magnetic mode re-entrant cavities

“…The development of accurate structure modeling based on lumped element analysis [1][2][3][4][5][6][7] has made them very valuable for creating small volume high-Q resonators for filtering applications from room to cryogenic temperatures in comparison with large Whispering Gallery and Bragg mode resonant cavities [6][7][8][9][10][11]. Re-entrant cavities have also been used for producing displacement sensors for gravitational bar detectors [12][13][14][15][16][17], oscillators using Gunn diodes [18] and electron beam tubes [18], and for millimetre wave resonators [20][21]. Furthermore, the re-entrant cavity has a high frequency tuning capability, which make them very attractive for telecommunication systems [22][23][24][25] and characterizing dielectric materials as a function of frequency [26][27].…”