全称：插入损耗，是以db（分贝）的形式表示的。 IL = 20 lg(Uo / Ui)，其中，IL为插损，Uo为输出信号，Ui为输入信号。 在光学系统中插损，表示的一种光能量在透射插入器件后的出射光强与入射光强的比值。
Substrate integrated waveguide(SIW) is a new type of waveguide structure,which has advantages such as low insertion loss,high Q value and easy to process and design,it has good application potential in the fields of radar,communication,navigation etc.
基片集成波导(SIW)是一种新型的波导结构,具有低插损、高Q值、易于加工和设计等优点,在雷达、通信和导航等领域有很好的应用价值。
参考来源 - 基于SIW的多波束波导缝隙阵列天线设计When the thickness of the ferrite film is 10 μm,the insert loss of the film circulator can be less than 1 dB and the isolation of the film circulator can be great than 20 dB in X-band(9.67～9.68 GHz)。
设计的薄膜环行器铁氧体薄膜厚度为10μm,在X波段(9.67～9.68GHz)可以达到插损低于1dB,隔离度大于20dB的设计要求。
参考来源 - 铁氧体薄膜环行器的设计·2,447,543篇论文数据，部分数据来源于NoteExpress
它具有频率选择性好，通带插损低，对陷波频点抑制较高的优点。
It is characterized by good frequency selectivity, low insertion loss and high attenuation of specified frequency.
此过渡结构体积小，通带平坦度好，插损小，非常适合于实际的工程应用。
The new transition has compact size, small ripples and low insertion losses in the passband. Because of these characteristics, this transition is fit for practical circuit.
基片的弯曲导致光线入射角度产生偏差，此角度偏差使波长测量不准，插损增加；
The substrate bend induced the deviation of incidence angle that cause the inaccuracy of wavelength measurement and increase the insert loss;
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