Novel 500-GHz Band Waveguide Stepped Septum-Type Circular Polarizer with a New High-Accuracy and Very Small Waveguide Flange
Novel 500-GHz Band Waveguide Stepped Septum-Type Circular Polarizer with a New High-Accuracy and Very Small Waveguide Flange
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DOI：
10.1007/s10762-020-00752-9
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Yutaka Hasegawa;H. Maezawa;H. Ogawa
中科院分区：
文献类型：
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作者：
Yutaka Hasegawa;H. Maezawa;H. Ogawa
研制了一种用于射电天文和行星大气观测的500 GHz波段波导阶梯膜片型圆极化器（SST CP）。在以前的研究中，我们开发了一个实用的SST-CP为230 GHz频段。然而，有几个问题阻碍了这种器件被轻易地按比例缩小到500-GHz频带，例如制造尺寸误差和波导凸缘位置误差。在这项研究中，我们开发了一种新的波导法兰，具有高精度的位置确定机构和非常小的尺寸为10 × 10 mm。我们还开发了一种新的制造技术，通过使用树脂夹具进行高精度抛光，使器件的毛坯材料获得非常好的平整度。采用这些新方法，研制的500 GHz频段SST-CP在465-505 GHz的交叉极化串扰电平优于-30 dB，器件表面平整度小于3 μm，水平定位误差小于± 3 μm。这些结果表明，开发的500 GHz频段SST-CP在高频频段具有高性能，因此新的制造方法在500 GHz频段是有效的。
A new waveguide stepped septum-type circular polarizer (SST-CP) was developed to operate in the 500-GHz band for radio astronomical and planetary atmospheric observations. In a previous study, we developed a practical SST-CP for the 230-GHz band. However, several issues prevent this device being easily scaled down to the 500-GHz band, such as manufacturing dimensional errors and waveguide flange position errors. In this study, we developed a new waveguide flange with a high-accuracy position determination mechanism and a very small size of 10 × 10 mm. We also developed a new fabrication technique to obtain very good flatness for the device’s blank materials by high-accuracy polishing using a resin fixture. Using these new methods, the manufactured 500-GHz band SST-CP achieved a cross-polarization talk level of better than – 30 dB at 465–505 GHz, a device surface flatness of within 3 μm, and also the horizontal positioning error of ± 3 μm. These results indicate that the developed 500-GHz band SST-CP has high performance in the high-frequency band, and thus the new manufacturing methods are effective in the 500-GHz band.