Waveguide is a kind of low loss transmission line.
波导是一种低损耗的传输线。
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;
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 measurements of optical-waveguide mode and propagation loss indicate that the film is of good optical waveguide properties with low loss.
膜表面粗糙度很小。光波导模式和光损耗测量表明膜具有较低的损耗。
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