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Development of the Fin-Line Superconductive Mixer in the Millimeter and Submillimeter Band

毫米及亚毫米波段翅片线超导混频器的研制

基本信息

批准号：
11554006
负责人：
OGAWA Hideo
金额：
$ 3.39万
依托单位：
OSAKA PREFECTURE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11554006/
关键词：
Superconductivity Millimeter Wave Mixer Multiplier

项目摘要

For a millimeter-wave heterodyne receiver, a sufficient, high-quality local oscillator (LO) power is fairly important to the receiver performance. Particularly for radio astronomical applications, it is one of the major factors driving quality astronomical observations.Besides a high-quality local source, how to perfectly inject the local signal into mixers is also determinant for a high performance receiver. In general, an ideal LO power injection method should satisfy following conditions : (1) providing sufficient quality LO power to pump nonlinear device ; (2) adding no additional loss to RF signal ; (3) adding no instability to the power from local source ; (4) eliminating local noise ; (5) resulting an injection structure compact and of no heavy duty to receiver system in any aspect.In millimeter-wave band, cross guide directional couplers are generally used to couple the LO power into mixers, while beamsplitters, which are usually made from a kind of very thin Teflon film or wire grid etc. and are mounted at 45° to the RF/LO paths, are more often used at shorter millimeter-wavelengths as well as submillimeter- wavelengths. Obviously, they all contribute additional loss and are not so compact, sometimes unstable.Based on SIS mixers' the advantage, we find that the LO power can be injected directly into the SIS junction through the junction subsrate, that is the LO signal shares same path with the dc/IF signal, but not with the RF signal as in traditional method. So conventional cross-guide couplers and beam splitters are not needed. Additionally the LO signal path and the RF signal one are completely separated before the junctions so that the RF insertion loss caused by the LO path can be decreased maximally. This is the basic idea of the new LO power injection method. We propose this method particularly for the applications of (sub)millimeter-wave SIS mixers.

对于毫米波外差接收机来说，充足、高质量的本振（LO）功率对于接收机性能相当重要。特别是对于射电天文应用来说，它是推动高质量天文观测的主要因素之一。除了高质量的本地信号源之外，如何将本地信号完美地注入混频器也是高性能接收机的决定因素。一般来说，理想的本振功率注入方法应满足以下条件：（1）为泵浦非线性器件提供足够优质的本振功率； (2) 不给射频信号增加额外的损耗； (3) 不会给本地电源带来不稳定因素； (4)消除局部噪声； (5) 注入结构紧凑，在任何方面对接收系统都没有重载。在毫米波频段，交叉导定向耦合器通常用于将本振功率耦合到混频器中，而分束器通常由一种非常薄的聚四氟乙烯薄膜或线栅等制成，与射频/本振路径成45°安装，更常用于较短的毫米波以及较远的波长。亚毫米波长。显然，它们都会带来额外的损耗，而且不够紧凑，有时还不稳定。基于SIS混频器的优势，我们发现LO功率可以通过结基板直接注入SIS结，即LO信号与dc/IF信号共享相同的路径，而不是像传统方法那样与RF信号共享相同的路径。因此不需要传统的交叉导耦合器和分束器。另外，本振信号路径和射频信号路径在交汇处之前是完全分离的，因此可以最大限度地降低本振路径引起的射频插入损耗。这就是新的LO功率注入方法的基本思想。我们特别针对（亚）毫米波 SIS 混频器的应用提出了这种方法。