无线电频率(RF) &无线设计

分(1/10)的贝尔是一个数据库,

但是dB = 10 *日志的方程(Po / Pi)

在阿宝就是力量,π是力量。

由于日志(基地10)数学函数提取指数,

分贝使用日志数学函数找到指数,这就是所谓的。

例如10 dB = 10 ^ 1 = 10 x功率增益而30 dB x = 10 ^ 3 = 1000功率增益

从那里,你只是多个10所以

10 dB = 10倍的功率增益

20 dB x = 100功率增益

30 dB x = 1000功率增益

40 dB x = 10000功率增益

低于10 dB的发电收益

0分贝= 1.000功率增益= 1.0 x

1 dB = 1.259 x功率增益= ~ 1.3 x

2 dB = 1.585 x功率增益= ~ 1.6 x

3 dB = 1.995 x功率增益= ~ 2.0 x

4 dB = 2.512 x功率增益= ~ 2.5 x

5 dB = 3.162 x功率增益= ~ 3.2 x

6 dB = 3.901 x功率增益= ~ 4.0 x

7 dB x功率增益= = 5.012 ~ 5.0 x

8分贝= 6.310 x功率增益= ~ 6.3 x

9 dB x功率增益= = 7.943 ~ 8.0 x

(以粗体显示的是你需要记住的)

自所有分贝添加但功率乘以你只需要知道一个让其他的因素。

由于3是6和9的因素你只需要知道3。

注意到6 db 9 db的倍数3 db所以你只需要记住3 db 2 x和

因此:

6 db = 3 + 3 db = 2 * 2 = 4 x的力量

和

9 db = 3 db + 3 + 3 = 2 * 2 * 2 = 8倍的力量

注意4 db和8的倍数2 db所以你只需要记住2 db是1.6 x和

因此:

4 db = 2 + 2 db = 1.6 * 1.6 = ~ 2.5 x

和

8 db = 2 + 2 db + 2 = 1.6 * 1.6 * 1.6 = ~ 4.0 x

甚至10 db = 5 + 5 db = 3.2 * 3.2 = 10倍的力量;所以本质上5 db是根号10。

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

毫瓦多次用于电力和dB术语表示为milli-deciBels或dBm

10毫瓦= 10 dBm

10 dBm = 10倍功率增益(毫瓦)

20 dBm = 100 x功率增益(毫瓦)

30 dBm = 1000 x功率增益(毫瓦)

40 dBm = 10000 x功率增益(毫瓦)

然而1000 mW = 1瓦特

所以30 dBm = 0分贝

dB是1和0 x的力量

因为毫意味着变换

和1000是10 ^ 3

在10 ^ 3功率的比值(Po / Pi)

所以0 dBm = 10 *日志(Po / Pi)

10 * 3 = 30倍的力量

其他表达式是一样的但在毫瓦表示不是瓦:

0 dBm = 1.000功率增益= 1.0 x

1 dBm = 1.259 x功率增益= ~ 1.3 x

2 dBm = 1.585 x功率增益= ~ 1.6 x

3 dBm = 1.995 x功率增益= ~ 2.0 x

4 dBm = 2.512 x功率增益= ~ 2.5 x

5 dBm = 3.162 x功率增益= ~ 3.2 x

6 dBm = 3.901 x功率增益= ~ 4.0 x

7 dBm = 5.012 x功率增益= ~ 5.0 x

8 dBm = 6.310 x功率增益= ~ 6.3 x

9 dBm = 7.943 x功率增益= ~ 8.0 x

(以粗体显示的是你需要记住的)

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

转换毫瓦瓦就减去30(因为30 dBm = 1000 mW = 1 w)

55 dbm = 25分贝

35 dBm = 5分贝

25 dBm = 5分贝

转换美国瓦茨毫瓦只是添加30(因为30 dBm = 1000 mW = 1 w)

35 dB = 65 dBm

15分贝= 45 dBm

3 dB = 33 dBm