Vol. 33

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2012-10-03

Design of Leaky Wave Antenna with Composite Right-/Left-Handed Transmission Line Structure for Circular Polarization Radiation

By Masahiko Ishii, Takeshi Fukusako, and Arokiaswami Alphones
Progress In Electromagnetics Research C, Vol. 33, 109-121, 2012
doi:10.2528/PIERC12082106

Abstract

This paper presents a design procedure for the generation of circular polarization (CP) from the composite right/left handed (CRLH) transmission line-(TL) with a coupled inter-digit structure and an inductive stub. The Ex and Ey components are generated from the parallel stubs and the fingers, respectively. The 90°-phase difference can be obtained by optimizing the dimension of the unit cell. In addition, the suitable amplitude ratio of |Ex| and |Ey| for CP generation is obtained by selecting a suitable position of the CRLH-TL between both edges of the ground. As a result, a CP with a measured bandwidth of 30.5% for an axial ratio (AR) of < 3 dB in the boresight direction is obtained. Using the behavior in both the left-handed (LH) and right-handed (RH) frequency regions, a scanning angle of the main beam of approximately 30° can be obtained by varying the frequency between 2.58 GHz and 2.99 GHz. Furthremore, the principle of CP generation is discussed.

Citation


Masahiko Ishii, Takeshi Fukusako, and Arokiaswami Alphones, "Design of Leaky Wave Antenna with Composite Right-/Left-Handed Transmission Line Structure for Circular Polarization Radiation," Progress In Electromagnetics Research C, Vol. 33, 109-121, 2012.
doi:10.2528/PIERC12082106
http://jpier.org/PIERC/pier.php?paper=12082106

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