Wave properties of the group delay correctors based on coupled strip-lines with different inphase and antiphase wave phase velocities

ABSTRACT

We considered the effect of the imbalance of the inphase and antiphase electromagnetic wave phase velocities on wave properties of group delay time corrector circuits based on contradirectional and transdirectional couplers. We obtained equations for the analysis of the wave dissipation matrix frequency response as a function of the resistance of the elements defining the specified phase frequency response and group delay. In addition, we obtained the group delay time difference as 3 ns under return and minimum insertion losses in the range of 17–20 dB in the 0.35–0.7 GHz bandwidth. We showed that systems based on contradirectional couplers can exhibit a deviation of 20% in the phase velocity ratio of the inphase and antiphase waves without the degradation of the corrector performance. It was found that the increase in the imbalance of phase velocities results in the narrowing of the operating bandwidth, while a transdirectional coupler enables the increase of the passband while maintaining the specified return losses.

KEYWORDS:

• Wave analysis
• group delay corrector circuits
• inphase and antiphase electromagnetic wave phase velocities
• phase velocities inequality
• contradirectional and transdirectional couplers based on coupled lines

Acknowledgments

We thank Artischev S.A. and Trenkal E.I. for assistance with experimental measurements performed at the Impulse Shared Use Center.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The study was financially supported by the Russian Ministry for Science and Education under Agreement No. 14.577.21.0279 dated on 26.09.2017, ID: RFMEFI57717X0279.

Notes on contributors

Nickolay Malyutin

Nickolay Malyutin received his Doctor of Science degree in 1993 from Tomsk State University of Control Systems and Radioelectronics, Russia. His areas of research are controlled strip-lines devices, such as phase shifters, waveform and phase correctors and development of printed circuit technology. In 2012, he was awarded the Russian Government Prize in Education.

Alexandra Malyutina

Alexandra Malyutina graduated with honors majoring in mathematics research in 1970 from Tomsk State University, Tomsk, Russia. She received a PhD degree in physics and mathematics in 1989. She has been an associated professor since 1992. Her research area is complex variable function theory.

Vyacheslav Fedorov

Vyacheslav Fedorov graduated in 1980, majoring in radio engineering design and manufacturing. He received a PhD degree in ultra-high frequency antennas, devices, and technologies from Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia, in 1999. Since 2007, he has been working as an assistant professor at the Radiophysics and Electronic Systems Department, Ammosov North-West Federal University.

Anton Loschilov

Anton Loschilov graduated in 2005, majoring in radio equipment development and technology. He received a PhD degree in ultra-high frequency antennas, devices and technologies from Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia, in 2008. His areas of research are broadband devices and antennas, time-domain reflectometer measurements, and printed circuit electronics.

Rakhmatullo Sharabudinov

Rakhmatullo Sharabudinov graduated in 2017, majoring in electronic equipment design and technology from Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia. Currently, he is a graduate student and laboratory assistant at the Telecommunication Research Institute, Tomsk.