Abstract
A novel compact quadrature feeding circuit for a circularly polarized antenna is described. The equivalent circuit method in microwave network theory is used and the conventional directional coupler is converted to a new quadrature feeding circuit. This feeding circuit has the same characteristics as the conventional directional coupler but its size is only about one fourth of that of the latter. The formulas for designing the feeding circuit are given. The optimized results obtained by using the software ENSEMBLE are also reported.
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References
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Zhang-Fa Liu, Pang-Shyan Kooi, et al., A method for designing broad-band microstrip antennas in multilayered planar structures, IEEE Trans. on Antennas propagat., AP-47(1999)9, 1416–1420.
ENSEMBLE, Ansoft Corp. Boulder Microwave Technologies, USA.
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Dong, Y., Tian, B. & Tang, S. A compact quadrature feeding circuit for circularly polarized antenna. J. of Electron.(China) 19, 329–331 (2002). https://doi.org/10.1007/s11767-002-0061-8
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DOI: https://doi.org/10.1007/s11767-002-0061-8