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| 型号： | ATREB232ED-EK |
| 厂商： | Atmel |
| 文件页数： | 15/40页 |
| 文件大小： | 0K |
| 描述： | AT86RF232 EVAL KIT |
| 产品培训模块： | AT86RF232 Low Power 2.4 GHz Wireless Transceiver |
| 标准包装： | 1 |
| 类型： | 收发器，微控制器 |
| 频率： | 2.4GHz |
| 适用于相关产品： | AT86RF232 |
| 已供物品： | 4 块板，电池，电缆，文档 |
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Atmel AVR2092
Figure 5-6. Board layout – GND and shield.
Besides the function to provide supply ground to the individual parts, the ground
plane has to be considered as a counterpart for the antenna. Such an antenna base
plate is required to achieve full antenna performance. It has to be a continuous,
sustained metal plate for that purpose. The shield, covering the electronic section will
help to form this antenna base plate.
For that reason, any unused surface should be filled with a copper plane and
connected to the other ground side using sufficient through hole contacts. Larger
copper areas should also be connected to the other side layer with a grid of vias. This
will form kind of a RF sealing for the FR4 material. Any wave propagation in between
the copper layers across the RF4 will become impossible. This way, for an external
electromagnetic field, the board will behave like a coherent piece of metal.
When a trace is cutting the plane on one side, the design should contain vias along
this trace to bridge the interrupted ground on the other side. Place vias especially
close to corners and necks to connect lose polygon ends.
The pads where the shield is mounted also need some attention. The shield has to be
integrated in the ground planes. Vias, in a short distance to the pads, will ensure low
impedance integration and also close the FR4 substrate as mentioned above.
5.6 PCB detail 6 – transceiver RF tuning
The REB232ED implements a tuning structure to optimize the transceiver matching.
A transmission line in combination with a capacitor is used to vary the load
impedance. The capacitance value and the position of the capacitor can be changed
to tune the system. To vary the position along that line, the tuning capacitor can be
assembled on to the footprint of C23, C26 or C27.
To measure the tuning result, U1 has to be removed and a piece of rigid 50 ? cable
can be soldered to its pin 5. The measurement using X2 is not impossible but much
harder to calibrate and a way to control U1 has also to be found.
15
8427A-AVR-10/11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ATREB233SMAD-EK | 功能描述:射频开发工具 AT86RF233 evaluation kit RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
| ATREB233-XPRO | 功能描述:XPLAINED PRO EXT REB233 制造商:atmel 系列:Xplained Pro 零件状态:有效 类型:收发器 频率:2.4GHz 配套使用产品/相关产品:AT86RF233 所含物品:板 标准包装:1 |
| ATRF231USB-RD | 制造商:Atmel Corporation 功能描述:AT86RF231 AND CORTEXM3 USB STICK - Boxed Product (Development Kits) 制造商:Atmel Corporation 功能描述:AT86RF231 and CortexM3 USB stick |
| ATRF4CE-EK | 功能描述:开发板和工具包 - 无线 RF4CE evaluation kit RoHS:否 制造商:Arduino 产品:Evaluation Boards 工具用于评估:AT32UC3L 核心:AVR32 频率: 接口类型:USB 工作电源电压:5 V |
| ATRJ8-FSSR | 制造商:Amphenol Sine Systems 功能描述:RJ PLUG, FIELD SLD STRN RELIEF |
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