Progress In Electromagnetics Research M
ISSN: 1937-8726
Home | Search | Notification | Authors | Submission | PIERS Home | EM Academy
Home > Vol. 60 > pp. 189-196


By X. Li, X.-Q. Li, Q.-X. Liu, and J.-Q. Zhang

Full Article PDF (998 KB)

Three bent waveguides are proposed and investigated, two for circular waveguide TM01 mode transmission and one for coaxial TEM mode transimission. For high power-handling capacity, all of them are over-mode waveguides. In the bend, circular or coaxial waveguides transmitting only sector waveguide TE11 modes are split into several same sector waveguides by metal plates and metal rod. Those sector waveguides are grouped by their lengths. Different lengths of sector waveguides mean there are phase differences of the TE11 modes after bending. Due to requirements of mode conversion, the phase difference regulated by radii of circular waveguide and metal rod must be 2nπ, n = 0, 1, 2…. Since the phase difference is independent of bend radius, the radius could be as small as possible. One of the prototypes is experimented, and the test result of the VSWR shows that simulation has good match with experiment. Insertion loss is 0.2 dB at 8.4 GHz, which proves the feasibility of the prototype.

X. Li, X.-Q. Li, Q.-X. Liu, and J.-Q. Zhang, "High Power Over-Mode Bent Waveguides for Circular TM01 and Coaxial TEM Mode Transmission," Progress In Electromagnetics Research M, Vol. 60, 189-196, 2017.

1. Barker, R. J. and E. Schamiloglu, High-Power Microwave Sources and Technologies, 2001.

2. Schamiloglu, E. and K. H. Schoenbach, "Basic research on pulsed power for narrowband high-power microwave sources," Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4720, 1-9, 2002.

3. Bacon, L. D. and L. F. Rinehart, "A brief technology survey of high-power microwave sources," Office of Scientific & Technical Information Technical Reports, 2001.

4. Li, X. Q., Q. X. Liu, X. J. Wu, L. Zhao, J. Q. Zhang, and Z. Q. Zhang, "A GW level high-power radial line helical array antenna," IEEE Transactions on Antennas and Propagation, Vol. 56, No. 9, 2943-2948, Sept. 2008.

5. Li, X. Q., et al., "16-element single-layer rectangular radial line helical array antenna for high-power applications," IEEE Antennas & Wireless Propagation Letters, Vol. 9, No. 1, 708-711, 2010.

6. Li, X. Q., Q. X. Liu, and J. Q. Zhang, "High power 12-element triangular-grid rectangular radial line helical array antenna," Progress In Electromagnetics Research C, Vol. 55, 17-24, 2014.

7. Li, X. Q., Q. X. Liu, and J. Q. Zhang, "Double-layer radial line helical array antenna with rectangular aperture," Progress In Electromagnetics Research Letters, Vol. 31, 15-24, 2012.

8. Yuan, C., H. Zhong, and B. Qian, "Design of bend circular waveguides for high-power microwave applications," High Power Laser and Particle Beams, Vol. 2, 020, 2009.

9. Ding, Y., Q. Liu, and J. Zhang, "Design and experiment study of overmode bend circular waveguide," High Power Laser & Particle Beams, Vol. 23, No. 8, 2135-2140, 2011.

10. Van Hese, J. and D. De Zutter, "Modeling of discontinuities in general coaxial waveguide structures by the FDTD-method," IEEE Transactions on Microwave Theory and Techniques, Vol. 40, No. 3, 547-556, Mar. 1992.

11. Chittora, A., S. Singh, A. Sharma, and J. Mukherjee, "Design of wideband coaxial-TEM to circular waveguide TM01 mode transducer," 2016 10th European Conference on Antennas and Propagation (EuCAP), 1-4, Davos, 2016.

12. Li, X. M., X. Q. Li, Q. X. Liu, and J. Q. Zhang, "Novel overmode circular waveguide bend for high power TM01 mode transmission," 2017 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, 2223-2224, San Diego, California, USA, Jul. 9-14, 2017.

13. Yuan, C. W., et al., "A novel TEM-TE11 mode converter," IEEE Microwave & Wireless Components Letters, Vol. 15, No. 8, 513-515, 2005.

14. Yuan, C. W., et al., "A novel TM01-TE11 Circularly Polarized (CP) mode converter," IEEE Microwave & Wireless Components Letters, Vol. 16, No. 8, 455-457, 2006.

15. Jameson, R. A., "High-brightness H-accelerators," 1987 Particle Accelerator Conference, 903, Washington, D.C., IEEE Catalog No. 87CH2387-9, Mar. 16-19, 1987.

© Copyright 2010 EMW Publishing. All Rights Reserved