KSD211B 3BHE022455R1101 ABB输入耦合单元KS D211 B101模块

KSD211B 3BHE022455R1101 ABB输入耦合单元KS D211 B101模块

定向耦合器是一种具有定向传输特性的四端口元件，它是由耦合装置联系

在一起的两对传输系统构成的。首先介绍定向耦合器的性能指标，然后介绍波导双孔定向耦合器、双分支定向耦合器和平行耦合微带定向耦合器。

KS D211 B101波导双孔定向耦合器是最简单的波导定向耦合器，主、副波导通过其公共窄壁上两个相距d=（2n+1）λg0/4 的小孔实现耦合其中，λg0是中心频率所对应的波导波长，n为正整数，一般取n=0。耦合孔一般是圆形，也可以是其它形状。

当工作在中心频率时，βd=π/2，此时D→∞; 当偏离中心频率时，secβd具有一定的数值，此时D不再为无穷大。实际上双孔耦合器即使在中心频率上，其定向性也不是无穷大，而只能在30dB左右。总之，波导双孔定向耦合器是依靠波的相互干涉而实现主波导的定向输出，在耦合口上同相叠加，在隔离口上反相抵消。为了增加定向耦合器的耦合度，拓宽工作频带，可采用多孔定向耦合器

A directional coupler is a four-port element with directional transmission characteristics, which is connected by a coupling device

Consisting of two pairs of transmission systems together. First, the performance of directional couplers are introduced, and then the waveguide double-hole directional couplers, double-branch directional couplers and parallel coupled microstrip directional couplers are introduced.

KS D211 B101 waveguide double-hole directional coupler is the most simple waveguide directional coupler, the main and secondary waveguides through the common narrow wall of two holes d= (2n+1) λg0/4 to achieve coupling, where λg0 is the waveguide wavelength corresponding to the center frequency, n is a positive integer, generally n=0. Coupling holes are generally round, but can also be other shapes.