A novel waveguide T-junction is shown to provide the basic building block of a very compact OMT design. It is formed by a short circuited common circular (or square) waveguide section exhibiting two rectangular waveguide ports at the short circuit situated at opposed side walls — one with an E- and the other with an H-plane alignment. Thus the orthogonal modes (polarizations) of the common waveguide are coupled by different field components at the side wall ports, i.e., the E-plane waveguide port couples the Hx-fields of the 1st polarization (TE11s/TE01) while the H-plane port serves the Hz-fields of the orthogonal one (TE11c/TE10). High isolation between the orthogonal polarized signals is obtained due to the symmetry and the port alignment of the structure. The implementation of appropriate discontinuities within the T-junction allows the realization of a single-acting OMT solution with high performance properties. The approach is verified by a realized OMT design at 26GHz that is made from a single block by CNC machining
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机译:显示了一种新颖的波导T形结,可提供非常紧凑的OMT设计的基本构建块。它是由一个短路的公共圆形(或方形)波导部分形成的,该部分在相对的侧壁处的短路处具有两个矩形波导端口-一个带有E型,另一个带有H平面对齐。因此,公共波导的正交模式(偏振)在侧壁端口处通过不同的场分量耦合,即E平面波导端口耦合1 的H x inf>场st sup>极化(TE 11s inf> / TE 01 inf>),而H平面端口服务于正交平面的H z inf>场(TE 11c inf> / TE 10 inf>)。由于结构的对称性和端口对准,在正交偏振信号之间获得了很高的隔离度。通过在T形结内实现适当的不连续性,可以实现具有高性能的单作用OMT解决方案。该方法已通过已实现的26GHz OMT设计进行了验证,该设计是通过CNC加工由单个模块制成的
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