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参数资料
| 型号： | ATREB232ED-EK |
| 厂商： | Atmel |
| 文件页数： | 21/40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
The second step is to calibrate the network analyzer (NWA) to the 50 ? connector as
usual. After normal calibration, the reference point for the NWA is at the cable SMA
connection. To determine the tuning elements, the reference point has to be moved to
the antenna feed point using the extended length parameter inside the NWA. To
determine this parameter, a hard short is required at the antenna feed line end.
Remove the solder resist on the left and right sides of the feed line end and short the
line end to ground with two solder bumps (see Figure 5-12 ). Do not use any wires to
create a ground connection. The calibration procedure will only work when the short
is exactly at the line end and has a minimum of parasitic inductance. Now the NWA
extended length parameter can be adjusted until the NWA’s Smith chart displays a
nice short for the desired frequency range.
In the third step, the antenna behavior can be measured without any tuning elements.
To see the real antenna behavior, the board must be placed in a position similar that
of the final application. If the final application has a housing installed, then all these
measurements must be done with the housing attached. Any piece of metal or plastic
can tune the antenna to a different frequency.
In the case of small boards with an edge length of less than 10cm, the connected RF
cable is often a source of measurement errors. The outer conductor of the coaxial
cable could interact with the field radiated by the antenna and, therefore, create an
additional counterpart ground for the antenna. To avoid this effect, the coaxial cable
can be fed through several ferrite beads. The ferrite beads need to be placed close to
the test board.
The initial measurement shows that the antenna is already working nicely in the
desired frequency band. The feed resistance is a bit low, and the antenna has an
inductive behavior.
21
8427A-AVR-10/11
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| 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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