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现有的或正在研究的用于100GHz以上频率的波导包括主模和过模矩形波导、圆形低损耗模式波导、微带、H形波导和槽形波导、各种介质波导、悬置带线和鳍线,以及准光波导。工作在100—300GHz范围内的大多数现有系统,例如接收机,一直采用矩形TE_(10)波导,或者工作在矩形波导系统中的某种形式的带线。这种系统的损耗大,尺寸很小,不过长度不长。这两种波导都不具有扩展到大大超过300GHz频率范围的能力。不少其它形式的波导具有一些令人鼓舞的特点,例如合理的低损耗、容易制造,或者说具有制成元件的能力,可是还没有哪一种已研究到能使系统充分利用这部分频谱的实用化阶段。
Waveguides available or currently under study for frequencies above 100 GHz include dominant and overmoded rectangular waveguides, circular low loss mode waveguides, microstrip, H-shaped and slotted waveguides, various dielectric waveguides, suspended ribbon wires And fin lines, as well as quasi-optical waveguides. Most existing systems that operate in the 100-300 GHz range, such as receivers, have been using rectangular TE 10 waveguide or some form of strip line operating in rectangular waveguide systems. The loss of this system, the size is small, but the length is not long. Neither of these waveguides has the capability to extend significantly beyond the 300 GHz frequency range. Many other types of waveguides have some encouraging features such as reasonable low loss, ease of manufacture, or the ability to be made into components, yet none have been studied to allow the system to make full use of this portion of the spectrum Practical stage.