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A Novel TM _01 –TE _11 Circularly Polarized (CP) Mode Converter

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4 Author(s)
C. -W. Yuan ; Coll. of Optoelectr. Sci. & Eng., Nat. Univ. of Defense Technol., Changsha ; H. -H. Zhong ; Q. -X. Liu ; B. -L. Qian

A novel mode converter that converts a TM01 mode to a CP TE11 mode was developed. In the converter, the TM01 mode is transformed into a coaxial transverse electric and magnetic (TEM) mode first, then the coaxial TEM mode is split in space into multiple TE11 sector waveguide modes by eight plates in the coaxial waveguide, which further subject the TE11 sector waveguide modes to different signal paths and hence effectively convert the TEM mode into a CP TE11 mode. A mode converter at 4GHz was designed. The conversion efficiency of TM01-to-TE11 is 99% at center frequency with an axial ratio of 0.7dB. Over the frequency range of 3.8-4.3GHz, the conversion efficiency exceeds 90%, and the axial ratio is less than 2.7dB. A good agreement between experiments and simulations was observed

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:16 ,  Issue: 8 )