An active frequency-tuned beam-scanning leaky-wave antenna

✍ Scribed by Cheng Chi Hu; Jin Jei Wu; Christina F. Jou

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 113 KB
• Volume: 17
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(199801)17:1<43::aid-mop10>3.0.co;2-c

✦ Synopsis

A frequency-tuned beam-scanning antenna is de¨eloped, which integrated a microstrip leaky-wa¨e antenna with a ¨aractor-tuned HEMT VCO as the source. The microstrip leaky-wa¨e antenna is operated in the first higher mode. To excite the first higher mode, the microstrip leaky-wa¨e antenna is fed asymmetrically. The dominant mode excitation has been successfully suppressed by adding a sequence of co¨ered wire in the center of the microstrip leaky-wa¨e antenna. The HEMT oscillator frequency is controlled by tuning the ¨aractor dc bias, and the beam scanning is demonstrated. The measured scanning angle agrees well with the prediction; it is close to 30Њ as the VCO frequency is tuned from 8.06 to 9 GHz.