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利用传输线式耦合电路的移相器,因为其耦合部分的电长度是1/4波长,故实际使用时,体积大,困难不小。本文以传输线式定向耦合器为基础,使其变形成移相器电路,并加以研讨。以前人们一般认为,其耦合部分的电长度为1/4波长是不言自明的,但我们已找出了长度比1/4波长还要短,插入损耗为0dB,输入阻抗与负荷阻抗相等且相位变化为360°的移相电路,并推导出最佳条件的公式,进而,对在制作这类耦合器时往往发生由于在平衡部分和不平衡部分的传输速度不同所造成的特性变化,加以仔细研究,从而明确了最佳设计方法。依据上述成果,我们进行了小型 VHF 频段移相器的试制,而且达到了实测特性和理论特性的良好吻合。小型移相器可用于天线合成,消除重影及同频干扰等。
Phase shifters using transmission-line coupling circuits, because of the electrical length of the coupling portion is 1/4 wavelength, so the actual use, the volume is large, the difficulty is not small. In this paper, transmission line directional coupler based on the deformation of the phase shifter circuit, and to be discussed. In the past, it was generally considered that the electrical length of the coupling portion was ¼ wavelength, but it has been found out that the length is shorter than 1/4 wavelength, the insertion loss is 0 dB, the input impedance is equal to the load impedance and the phase change For the phase shift circuit of 360 °, and derive the formula of the best condition, and then, in the production of such coupler often occur due to the balance of the unbalanced part of the transmission rate and the characteristics of the changes caused by the Department of careful study , Thus defining the best design method. Based on the above results, we conducted trial production of a small VHF band phase shifter, and achieved good agreement between the measured and theoretical characteristics. Small phase shifter can be used for antenna synthesis, eliminating ghosting and co-channel interference.