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In this paper, a broadband circularly polarized (CP) microstrip antenna array using simplified composite right/left-handed transmission lines (SCRLH-TLs) based sequential rotation (SR) feed network is presented. The characteristics of a SCRLH-TL are investigated initially. Then, a broadband low insertion loss 45o phase shifter is designed using the SCRLH-TL and the phase shifter is em- ployed in constructing a SR feed network for CP antenna array. To validate the design method of the SR feed net- work, a 2×2 antenna array comprising sequentially rotated coupled stacked CP antenna elements is designed, fabri- cated and measured. Both the simulated and measured results indicate that the performances of the antenna ele- ment are further enhanced when the SR network is used. The antenna array exhibits the VSWR less than 1.8 from 4 GHz to 7 GHz and the axial ratio (AR) less than 3 dB from 4.4 GHz to 6.8 GHz. Also, high peak gain of 13.7 dBic is obtained. Besides, the normalized radiation patterns at the operating frequencies are symmetrical and the sidelobe levels are low at φ = 0o and φ = 90o.

SCRLH-TL Based Sequential Rotation Feed Network for Broadband Circularly Polarized Antenna Array