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A novel two-beam scanning active leaky-wave antenna

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3 Author(s)
Chien-Jen Wang ; Inst. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Jou, C.F. ; Jin-Jei Wu

A novel two-beam scanning active leaky-wave antenna (LWA) has been developed. This LWA with a two-terminal feeding microstrip line structure is integrated with a varactor-tuned X-band high-electron mobility transistor (HEMT) voltage-controlled oscillator (VCO). The signal of the VCO is injected via a T-divider into the radiating element. To excite the first higher order mode, the designed antenna is fed asymmetrically at both ends of the microstrip line. Compared with single-terminal feeding leaky-wave antennas, this configuration offers the advantages of dual-direction and suppression of the reflected wave caused by the open end of the radiating element. The scanning angle is steered over a range of 24-46° for the right beam and 128-150° for the left beam. The effective isotropic radiated power (EIRP) is calculated to be 17.5 and 16.67 dBm at 10.4 GHz, respectively. The measured return loss S11 is less than -10 dB in the range of 9-11.5 GHz. The transmission coefficient S21 indicates that the power radiates into the space

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Antennas and Propagation, IEEE Transactions on  (Volume:47 ,  Issue: 8 )