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An active frequency‐tuned beam‐scanning leaky‐wave antenna
Author(s) -
Hu Cheng Chi,
Wu Jin Jei,
Jou Christina F.
Publication year - 1998
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(199801)17:1<43::aid-mop10>3.0.co;2-c
Subject(s) - leaky wave antenna , varicap , microstrip antenna , microstrip , antenna (radio) , patch antenna , microwave , optics , electrical engineering , physics , optoelectronics , engineering , telecommunications , capacitance , electrode , quantum mechanics
A frequency‐tuned beam‐scanning antenna is developed, which integrated a microstrip leaky‐wave antenna with a varactor‐tuned HEMT VCO as the source. 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 HEMT oscillator frequency is controlled by tuning the varactor dc bias, and the beam scanning is demonstrated. The measured scanning angle agrees well with the prediction; it is close to 30° as the VCO frequency is tuned from 8.06 to 9 GHz. © 1998 John Wiley & Sons, Inc. Microwave Opt Technol Lett 17: 43–45, 1998.