An asymmetric feeding X-band active frequency-scanning leaky-wave antenna |
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Authors: | Cheng Chi Hu Jin Jei Wu and Christina F Jou |
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Institution: | (1) Institute of Communication Engineering, National Chiao Tung University, Hsinchu, Taiwan, Republic of China |
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Abstract: | An asymmetric feeding X-band active leaky-wave antennas is developed, to excite the first high order mode of the microstrip
leaky wave antenna. One is the asymmetric feeding leaky-wave antenna which integrated with a HEMT oscillator, and the other
is the frequency-tuned leaky-wave antenna which integrated with a varactortuned HEMT VCO. The microstrip leaky-wave antenna
is operated in the first higher mode. To excite the first higher mode, the microstrip leaky-wave antenna is fed asymmetrically.
The dominant mode excitation has been successfully suppressed by adding a sequence of covered wire in the center of the microstrip
leaky wave antenna. The design of these active leaky-wave antennas is discussed and the beam scanning phenomena of the antenna
is presented. The HEMT oscillator frequency is controlled by tuning the varactor DC bias and the beam scanning is demonstrated.
The measured scanning angle agree with prediction, it is close to 30° as the VCO frequency tuned from 8.06 GHz to 9GHz. |
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Keywords: | asymmetric feeding leaky-wave antenna frequency scanning varactor-tuned VCO |
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