Datasheet > ANTENNA_125

ANTENNA_125

更新时间： 2024-11-06 12:23:47

品牌	Logo	应用领域
RFSOLUTIONS		/
页数	文件大小	规格书
4页	118K
描述
Micro RWD 125kHz Antenna Specification

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

ANTENNA_125 数据手册

ib technology

Data Sheet

ANTENNA_125.PDF

4 Pages

Last Revised 21/09/09

Micro RWD 125kHz Antenna Specification

The Micro RWD has been designed to interface to a simple low Q (10-20) antenna coil

of around 700uH (micro Henry) inductance operating at a carrier frequency of 125 kHz.

For maximum range and performance the following factors should be considered:

1) Maximum range and coupling between transponder and RWD is based on the ratio

of their antenna diameters. Very approximately the RWD antenna loop diameter

should be 2-3 times the diameter of the transponder coil. The basic method of

communication is via magnetic flux linkage (like an air-cored transformer) so the

more lines of flux that intersect the transponder coil, the better the overall

performance. For ISO card transponders there is little benefit in using an RWD

antenna larger than 10cm diameter. Circular antenna coils generally give a more

uniform flux distribution.

2) The Micro RWD is designed to give up to 400ma pulse current with a peak voltage

of up to 200v. This can give a 20cm read/write range with HT2 ISO card

transponders. Lower burst current can be achieved by inserting an additional series

resistor in the antenna loop circuit (22R in series would typically reduce pulse

current/voltage by about half using example antennas). This is recommended in

order to give the optimum signal-to-noise ratio and Q value.

3) Sample antenna supplied is for demonstration only. The characteristics of an

antenna for EMC/WT approval will vary according to shape of coil, type of wire

used, style of winding, bobbin material, compaction of windings etc.

4) If the antenna is to be positioned remote to the Micro RWD a screened twisted pair

cable can be used to connect them. The screen should be connected to the Antenna

GND pin on the Micro RWD. Cable lengths up to 1.5 metres have been tested and

perform well with no significant system degradation.

5) The capacitance and inductive effect of antenna cable and physical positioning of

the antenna should be taken into account when designing the antenna coil and if

necessary the inductance of the coil should be adjusted to compensate. The 125KHz

tuned circuit is basically an RLC network with the C element fixed on the Micro

RWD board. Tuning the antenna inductance (L) for optimum performance is quite

simple, the positioned antenna system should be connected to the Micro RWD and

power applied. An oscilloscope should be connected between the AN 2 pin and the

GND pin. Without a transponder in the field a pulsed 125kHz sine wave will be

seen with a peak voltage of up to +/-180v, with small switching “steps” visible near

the peaks and troughs of the sine wave.

12 3 4

中文翻译

下载PDF

与ANTENNA_125相关器件

型号	品牌	获取价格	描述	数据表
ANTENNA_1356	RFSOLUTIONS	获取价格	Micro RWD MF (Mifare) Antenna Specification
ANT-G21B301111	REDLION	获取价格	MODEL XCHSPA â HSPA CELLULAR MODEM OPTION C
ANT-G30B108111	REDLION	获取价格	MODEL XCHSPA â HSPA CELLULAR MODEM OPTION C
ANT-GA107201111	REDLION	获取价格	MODEL XCHSPA â HSPA CELLULAR MODEM OPTION C
ANT-GPS-SE-MCX	ETC	获取价格	High-gain, low-noise design
ANT-GPS-SE-RPS	ETC	获取价格	High-gain, low-noise design
ANT-GPS-SE-SMA	ETC	获取价格	High-gain, low-noise design
ANT-GPS-SH-MCX	ETC	获取价格	High-gain, low-noise design
ANT-GPS-SH-MMX	ETC	获取价格	High-gain, low-noise design
ANT-GPS-SH-SMA	ETC	获取价格	High-gain, low-noise design

与ANTENNA_125相关文章

英伟达新AI芯片Rubin或提前半年亮相
2024-11-05

14
苹果iPhone 17将全系采用三星/LG显示LTPO OLED面板
2024-11-05

12
三星深化印度制造布局，供应链本地化进程加速
2024-10-29

36
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
2024-10-29

33

产品中心

服务支持

精选活动

关于我们

帮助中心

ANTENNA_125

ANTENNA_125 数据手册

与ANTENNA_125相关器件

与ANTENNA_125相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

ANTENNA_125

ANTENNA_125 数据手册

与ANTENNA_125相关器件

与ANTENNA_125相关文章

您还可以找

您在本页遇到什么问题？