Development of a Compact Low-Temperature Co-fired Ceramic Antenna Front-End Module
| Autor: | Chia-Chun Weng, 翁嘉君 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 This thesis proposes a compact 5 GHz front-end module with embedded antenna on a low-temperature co-fire ceramic (LTCC) substrate, which is to be used for the IEEE 802.11a wireless local area network (WLAN) applications. This module comprises an embedded inverted-F antenna, a band-pass filter, and a low-pass filter. Both the proposed filters possess transmission zeros at out band for suppressing unwanted signals. Also, a double-pole double-throw (DPDT) bare die transmitting/receiving (T/R) switch is mounted on the surface of the substrate. The interconnection between the bare die switch and the buried circuits is established by bond wires. The effect of the bond wire is considered by incorporating its equivalent inductance into the design of the filters. The overall size of the antenna front-end module is only 6.2 mm × 5.4 mm × 0.98 mm, with most of the space (near two third of the volume) reserved for the antenna so as to have a better radiation performance. Also, to avoid the potential close proximity coupling among the buried circuits and the antenna, numerous metal vias connecting the top and bottom grounds in the module are designed for shielding. Since the radiation of a small antenna is influenced by the nearby circuit ground due to induced ground current, the developed antenna front-end module is tested on two FR4 printed circuit boards (PCBs) with different sizes (i.e., 55 mm × 20 mm and 80 mm × 46 mm). It is demonstrated that the antenna module performs well on these two grounded PCBs. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|