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| 型号： | ATREB232ED-EK |
| 厂商： | Atmel |
| 文件页数： | 17/40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
Because the antenna has to operate in an environment different from that of the
manufacturer’s evaluation board, the correct frequency tuning has to be verified. The
antenna distance, required for optimum diversity operation, provides enough board
space to use a low-cost tuning method based on a transmission line and capacitors.
The actual tuning procedure is explained in Section 5.7.3 , page 20 .
Figure 5-8. Initial antenna tuning and test board.
Besides the antenna tuning, the test board was used to measure the diversity effect
and the coupling between the two antennas. The better the two antennas are isolated
from each other, the higher is the diversity advantage for the receiver.
It has to be considered that the unused antenna is operating against an open line end
because the RF switch, U1, has high impedance in the off position. A low coupling in
between the antennas is therefore required.
Direct coupling measurement results between both antennas are shown in Figure 5-9 ,
page 18 . Over the operating frequency range, the antenna separation is >15dB. That
is achieved mainly with the ±45-degree installation. The 90-degree turn between left
and right antennas causes orthogonal radiation patterns and minimal coupling.
Because the polarization of a received wave is not deterministic in a multipath
environment, this setup is also capable of selecting the optimum polarization match
for an incoming wave.
The other design aspect is the antenna distance. The antenna distance has to be
large enough to ensure only one of the two antennas is present in a local fading
minimum. Figure 5-10 , page 19 , shows the field strength plot for both antennas,
dependent on the board position. For this test, the antenna board was moved along a
workbench using a stepper motor. The transmitter was positioned several meters
away on another workbench. No direct line of sight connection is ensured using a
17
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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