Novel low-cost wideband Si-based submount for 40 Gb/s optoelectronic devices
✍ Scribed by Bing Xiong; Jian Wang; Pengfei Cai; Jianbai Tian; Changzheng Sun; Yi Luo
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 158 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
wider (that is, more than three times) than that of an identicallength meander-slot antenna. It is also important to note that the resonant frequency of the proposed antenna is 2.85-GHz lower than that of an identical dimension bow-tie-slot antenna. These results show that the proposed antenna design successfully optimized two seemingly conflicting antenna design goals, such as size reduction and bandwidth enhancement.
Based on the simulated results, the proposed antenna is fabricated on the Teflon substrate (dielectric constant ϭ 2.3, thickness ϭ 0.508 mm) and the measured antenna performance is presented in Figure 2. Note that in this measurement, the size of the ground plane is chosen to be large enough not to affect the antenna's performance (greater than g /4). The fabricated antenna reveals almost identical resonant behavior with the predicted one, though it has a slightly wider bandwidth (about 46 MHz) due to various losses, such as dielectric and conductor losses, as well as possible losses from various interconnections. The specific values of antenna dimensions, resonant frequencies, and bandwidth are summarized in Table 2. Figure 3 shows the measured electric-field radiation pattern, which is normalized by maximum value at the resonant frequency (5.25 GHz). The proposed antenna displays almost the same radiation characteristics as the conventional slot antenna. The measured maximum gain is 3.23 dBi.
4. CONCLUSION
In this paper, a novel bow-tie-shaped meander-slot antenna designed for 5-GHz applications has been proposed. The proposed antenna is combined with the meander-slot geometry, thus providing a compact size and a bow-tie-slot structure that exhibits an exhibiting relatively large bandwidth. The 10-dB bandwidth of the fabricated antenna is about 217 MHz (5143-5360 MHz), which is sufficient to be used in 5-GHz wireless local area network (WLAN) applications, ranging from 5.15 to 5.35 GHz. To our best knowledge, the antenna proposed in this work has the smallest dimensions for 5-GHz region applications requiring more than 200-MHz bandwidth.