THE RESONANT SYSTEM OF A SUB-TERAHERTZ LOCAL OSCILLATOR

DOI: https://doi.org/10.15407/rpra27.01.064

I. K. KUZMICHEV, B. I. MUZYCHISHIN, А. Yu. POPKOV, Аlexander V. MAY, Alexey V. MAY

Abstract


Purpose. The excitation efficiency is investigated of the first higher-order axially asymmetric oscillation mode (TEM10q) excited in a hemispherical open resonator (OR) at the frequencies of the fundamental and second-order harmonics of the Gunn diode in the 4-mm and 2-mm wavelength ranges. The hemispherical resonator is coupled to its input waveguide via aperture-type coupling elements. The diameter 2a of the OR mirror apertures is 38 mm, while the curvature radius of the spherical reflector is R = 39 mm and the normalized distance between the mirrors is L/R = 0.593. Two aperture coupling elements of dimensions a× b = 6.9 × 9.6 mm are used to excite the OR. They permit controlling separately the functions of field-to-field matching (modes in the resonator and in the waveguide) and volume- to-volume coupling of the structural elements (the resonator and the waveguide). They are located at the center of the planar mirror. The field matching is determined by the geometric dimensions of the coupling elements, whereas the coupling matching is determined by the period of the one-dimensional E-polarized grating in their apertures. The Gunn diodes are used as generators, operating at the frequencies of the fundamental (75 GHz) andthe second-order (150 GHz) harmonics. The excitation efficiency of the TEM1011 oscillation in the OR of the geometry specified here, using aperture-type coupling elements as described, is 81.5%.

Design/methodology/approach. The excitation efficiency of higher-order oscillation modes ТЕМ10q in the OR being driven by an incident ТЕ10 mode that arrives via two rectangular guides, is evalua-ted using the antenna surface utilization factor. The reflection coefficient from the OR and the loaded Q-factor are estimated in the familiar technique of partial reflection coefficients summation.

Findings. As has been shown, in an OR of parameters 2а= 38 mm, R= 78 mm, and L/R= 0.287 TEM1022 oscillations are excited at the frequency of the Gunn diode’s second-order harmonic (i.e., 150 GHz) with an efficiency of 84%. In that same resonator, the excitation efficiency of the TEM1011 mode at the fundamental Gunn diode’s harmonic (frequency of 75 GHz) equals 54%. By placing one-dimensional (E-polarized) wire gratings in the aperture of the coupling elements it proves possible to match the resonator with the waveguide. It has been found that in the case of a l = 0.2 mm spatial period of the wire grating and matched excitation of the resonator at f = 150 GHz (i.e. Г150 = 0), the reflection coefficient Г75 from the OR at f = 75 GHz equals 0.637. Upon excitation in the OR of oscillations in the TEM1022 mode, the total loss at f = 150 GHz is –1.23 dB. With TEM1011 oscillations excited in the same resonator at a frequency of 75 GHz, the total losses increase up to –5.4 dB.

Conclusions. The analysis has shown that an OR implementing the proposed method of excitation of higher-order axially asymmetric for constructing a subterahertz range local oscillator. Moreover, such a resonant system may be considered both as a power combiner and a diplexer (filter).

 

REFERENCES

1. KASATKIN, L. V. and CHAYKA, V. E., 2006. Semiconductor Devices of Millimeter Wave Range. Sevastopol, Ukraine: Veber Publ. (in Russian).

2. NALIVAIKO, V. A., BOZHKOV, V. G. and NEUDAKHIN, V. I., 1991. Gunn Diodes for Solid State Tunable Generators. Elektronnaya promyshlennost’. No 7, pp. 58–67 (in Russian).

3. ARKUSHA, YU. V., PISKUN, A. A. and STOROZHENKO, I. P., 2010. Energy and frequency characteristics of Al1-xInxN-based Gunn diodes operating in a resonant cavity of complex geometryBulletin (Visnyk) of V. N. Karazin National University of Kharkiv. Ser. Radiophysics and Electronics, No 927, issue16, pp.3–6 (in Russian).

4. SOLBACH, K., SICKLING, F., and BARTH, H., 1983. Harmonic Gunn Oscillators Allow Frequency Growth. Microwaves and RF, vol. 22, No 4, pp. 75–127.

5. KUZMICHEV, I. K., 2000. Matching of quasioptical open resonators with waveguide feeders. Radiophys. Quantum Electron. vol. 43, is. 4, pp. 294–302. DOI: 10.1007/BF02677194

6. KUZMICHEV, I. K., and KHLOPOV, G. I., 1989. Matched excitation of quasi-optical open resonators. In: Quasi-optical techniques at millimeter and submillimeter wavelengths. Kharkiv, Ukrain: IRE AS of UkSSR Publ. pp. 149–156 (in Russian).

7. SCIENTIFIC RESEARCH INSTITUTE OF SEMICONDUCTOR DEVICES., 2021. Low to Medium Power (<100 mW) Millimeter-Wave (f=30–150 GHz) Gunn Diodes. (in Russian). [online]. [viewed 12 October 2021]. Available from: https://www.niipp.ru/catalog/detail.php?ID=222

8. SOOHOO, R. F.,1963. Nonconfocal multimode resonators for masers. Proc. IEEE. vol. 51, No 1, pp. 70–75. DOI: 10.1109/PROC.1963.1661

9. TARASOV, L. V., 1981. Physics of processes in coherent optical radiation generators. Moscow, USSR: Radio and Svyaz’ Publ. (in Russian).

10. VAINSHTEIN, L. A., 1963. On the electrodynamic theory of gratings. Part 1. In: High-Power Electronics. Moscow, USSR: USSR Academy of Sciences Publ. House, No 2, pp. 26–56 (in Russian).

11. VOLMAN, V. I. and PIMENOV, Yu. V., 1971. Technical electrodynamics. Moscow, USSR: Svyaz’ Publ. (in Russian).

12. KUZMICHEV, I. K., YERYOMKA, V. D., МAY, A. V. and TROSHCHILO, A. S., 2017. Open resonator for summation of powers at sub-terahertz and terahertz frequencies. Radio Phys. Radio Astron. vol. 22, No 1, pp. 67–77 (in Russian). DOI: 10.15407/rpra22.01.067

13. KUZMICHEV, I. K., 1991. Aperture excitation of millimeter-wavelength open resonators PhD. Th esis, Rostov State University (in Russian).

14. SHESTOPALOV, V. P., KIRILENKO, A. A., MASALOV, S. A. and SIRENKO, Y. K., 1986. Resonance wave scattering. vol. 1. Diff raction Gratings. Kyiv, USSR: ‘Naukova Dumka’ Publ. house (in Russian).

15. ANDROSOV, V. P. and KUZMICHEV, I. K., 1987. Infl uence on excitation effi ciency of the open resonator of its parameters and connection with a waveguide. Kharkov, USSR: IRE AN UkrSSR. Preprint no. 354. (in Russian).

16. KARUSHKIN, N. F., 2018. Solid-state components and devices of terahertz electronic technology in Ukraine. Telecommun.Radio Eng. vol. 77, is. 19, pp. 1735–1766. DOI: 10.1615/TelecomRadEng.v77.i19.60

17. DMITRIEV, V. V. (ed.), AKPAMBETOV, V. B., BRONNIKOVA, E. G., DEMIDOV, V. P., KARPEEV, D. V., LARIONOV, I. M. and VYSOTSKY, B. F. (ed.), 1985. Integrated piezoelectric signal fi lters and processing circuits. Moscow, USSR: Radio i Svyaz’ Publ. (in Russian).

18. ZAGORODNOV, A. P. and YAKUNIN, A. N., 2012. Problems of low-noise, high-frequency reference oscillator design. Nauchnoe Priborostroenie. vol. 22, No 1, pp. 19–24 (in Russian).


Keywords


open resonator, aperture coupling element, rectangular waveguide, excitation effi ciency, wire grating, oscillation Q-factor

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