Theoretical and experimental study of polarization characteristics of polarization maintaining fiber based on wavelength-sweeping modulation
✍ Scribed by Zuo-Liang Duan; Li-Yong Ren; Ya-Ni Zhang; Han-Yi Wang; Bao-Li Yao; Wei Zhao
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 135 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
of the varactors varied from 1.8 to 16 pF. The resonant frequency shifted from 160 to 200 MHz. The VSWR was kept less than 1.3 from 188 to 192 MHz. It was confirmed that the prototype antenna on glass covered the digital terrestrial radio band.
4. Conclusions
A varactor-loaded compact folded dipole antenna has been proposed for digital terrestrial radio reception. The prototype antenna in free space showed a VSWR of less than 1.4 and gain between À1.4 and À3.1 dBi from 187 to 230 MHz. The VSWR remained less than 1.3 in the digital terrestrial radio band from 188 to 192 MHz, even when the antenna was attached to the glass. The proposed antenna has advantages of a compact structure of 332 mm by 30 mm, wide tuning range with low VSWR, and ease of fabrication. It will be used for digital terrestrial radio reception in vehicles.