众所周知，微带线的损耗主要有介质损耗，导体损耗和辐射损耗。
As we all know, the losses of microstrip lines mainly include dielectric loss, conductor loss and radiation loss.
第三部分提出了一种新的微带带通滤波器结构。该结构很好解决了传统微带滤波器的辐射损耗和体积大等问题。
Last, a new microstrip bandpass filter is proposed on the basis of traditional square filter in this paper, which solves the problems of radiation loss and big volume in the traditional filter.
它综合了矩形波导和微带线的一系列优点：和传统的矩形波导一样集成波导具有较高的品质因数和很小的辐射损耗；
The substrate integrated waveguide borrow advantages of both of the rectangular waveguide and the microstrip, such as: high Q, low loss just like rectangular waveguide;
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