A Novel Microwave Nonreciprocal Isolator Based on Frequency Mixers
A Novel Microwave Nonreciprocal Isolator Based on Frequency Mixers
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DOI：
10.1109/lmwt.2023.3253124
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发表时间：
2023-03-15
期刊：
影响因子：
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通讯作者：
Onishi, Toshikazu
中科院分区：
文献类型：
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作者：
Masui, Sho;Kojima, Takafumi;Onishi, Toshikazu
提出了一种用两个混频电路实现的非互易微波隔离器。在与本机振荡器(LO)频率相同的频率下，混频器之间的相移是p/4+mp/2，并且施加到每个混频器的LO的功率具有p/4+np/2的相位差(其中n和m是任意整数)。在第一混音器的上边带和下边带中的上转换信号在随后的混音器中被组合，即使它们具有相位差。由于每个边带在一个方向上是同相的，而在另一个方向上是异相的，因此该电路主要用作隔离器，具有从近DC频率到LO频率的宽带。一种使用商用微波元件的隔离器在2.30 GHz的LO频率下，成功地在0.01-1.50 GHz频段上实现了超过17分贝的隔离。利用超导体-绝缘体-超导体混合器可以实现具有正增益的片上宽带隔离器。
We propose a nonreciprocal microwave isolator realized using an electrical circuit with two frequency mixers. A phase shift between the mixers at the same frequency as the local oscillator (LO) frequency is p /4 + mp /2, and the powers of LO applied to each mixer have a phase difference of p /4 + np /2 (where n and m are the arbitrary integers). The up-converted signals in the upper and lower sidebands at the first mixer are combined at the subsequent mixer, even if they have phase differences. Because each sideband is in-phase for one direction and out-of-phase for the other direction, the circuit principally functions as an isolator with broadband from near dc to LO frequency. An isolator using commercially available microwave components successfully demonstrated more than 17 dB of isolation across the 0.01-1.50-GHz band at an LO frequency of 2.30 GHz. An on-chip broadband isolator with positive gain can be realized using superconductor-insulator- superconductor mixers.