Design and analysis of broadband microwave absorber utilizing FSS screen constructed with circular fractal configurations
✍ Scribed by Ji-Chyun Liu; Chin-Yen Liu; Ching-Pin Kuei; Ching-Yang Wu; Yaw-Shun Hong
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 286 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
mm; hence, both elements can be easily integrated in embedded systems or in large planar-array configurations.
The measured radiation patterns in both cases are in reasonable agreement with the simulated results, approximating typical dipole behavior with moderate absolute gain (3 to 5 dBi) at lower frequencies (below 4 GHz). At higher frequencies, both antenna designs exhibit unidirectional radiation characteristics, with higher gain (over 7.5 dBi) as compared to a conventional dipole performance. The front-to-back ratio is better than 10 dB and beamwidth is approximately 120°in the azimuth and 45°in the elevation plane. As a consequence, both radiators can be used at higher frequencies as directive base-station antennas (for example, in access points) to form sectors or backbone links of a wireless network. Due to higher gain, even single elements can be used (depending on the application needs), thus leading to an attractive, cost-effective, and easily fabricated alternative to larger arrays.
ACKNOWLEDGMENT
The authors would like to thank the Advanced Dielectric Division of Taconic [10] for kindly providing the microwave dielectric laminates (TLY-5) used for implementation of the antennas presented herein, as well as Mihalis Christodoulou for his valuable help during the fabrication process.