Results are presented for a compact narrow-wall directional coupler which is suited for use in low-profile beamforming networks. This geometry, based on the Riblet short-slot coupler, makes use of continuous coupling between adjacent waveguides through a common full-height slot in the narrow wall. From the point-of-view of design and manufacturing this coupler geometry is attractive since it does not require capacitive loading. This comes at the expense of bandwidth: measured results show that over a 6.5% bandwidth /spl plusmn/0.125-dB power equality, 30 dB isolation and 1.07 VSWR is achieved for a coupler of length 1.25 /spl lambda//sub g/. Although this is less than the 15% achieved for capacitively-loaded couplers it is sufficient for many applications and the simplicity of the geometry makes it an attractive option in narrowband designs.
展开▼
机译:给出了适用于薄型波束成形网络的紧凑型窄壁定向耦合器的结果。基于Riblet短缝耦合器的这种几何形状利用了相邻波导之间通过窄壁中一个公共的全高缝隙的连续耦合。从设计和制造的角度来看,这种耦合器的几何形状很有吸引力,因为它不需要电容性负载。这是以带宽为代价的:测量结果表明,对于长度为1.25 / spl lambda // sub g /的耦合器,在超过6.5%的带宽/ spl plusmn / 0.125-dB功率均等,30 dB隔离和1.07 VSWR的情况下。尽管这少于电容负载耦合器的15%,但对于许多应用来说已经足够了,并且几何形状的简单性使其成为窄带设计中的诱人选择。
展开▼