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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 flngers, respectively. The 90 - -phase difierence can be obtained by optimizing the dimension of the unit cell. In addition, the suitable amplitude ratio of jExj and jEyj 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 < 3dB 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 2.58GHz and 2.99GHz. Furthermore, the principle of CP generation is discussed.

DESIGN OF LEAKY WAVE ANTENNA WITH COMPOSITE RIGHT-/LEFT-HANDED TRANSMISSION LINE STRUCTURE FOR CIRCULAR POLARIZATION RADIATION