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提出了利用CRLH(composite rightleft-handed)传输线结构来实现小型化平面微波器件的综合方法。实现器件小型化的关键是因为构成CRLH传输线的单位元胞在其左手通带内的特性阻抗和电长度可以在一个很宽的范围内任意调整,并且单位元胞的尺寸因媒质均匀理论的要求而远小于信号传播的波长。文中首先提出了利用CRLH传输线实现指定特性阻抗和相移的阻抗变换段综合过程,随后通过全波仿真软件AnsoftHFSS基于不同的小型化阻抗变换段结构设计加工了中心频率分别为1.92GHz和10GHz的定向耦合器和三端口功分器,依据所设计器件的仿真优化结果进行了实物加工和测量,并将仿真和测量结果进行了比较,结果表明,新型的定向耦合器和三端口功分器在保证良好传输特性的同时,缩减了器件的尺寸。
An integrated approach to realize miniaturized planar microwave devices using CRLH (composite right left-handed) transmission line structure is proposed. The key to miniaturization of the device is that the characteristic impedance and electrical length of the unit cells constituting the CRLH transmission line in the left hand passband can be arbitrarily adjusted over a wide range and the size of the unit cell due to the requirements of the uniform medium theory Far less than the wavelength of signal propagation. In this paper, the synthesis process of the impedance transformation segment with the specified characteristic impedance and phase shift is first proposed by using the CRLH transmission line. Then, the center frequency is 1.92GHz and 10GHz are designed and processed by the full-wave simulation software AnsoftHFSS based on different miniaturized impedance transformation segment structure Coupler and three-port power splitter, the physical processing and measurement are carried out according to the simulation optimization results of the designed device, and the simulation and measurement results are compared. The results show that the new directional coupler and three-port power splitter are guaranteed Good transmission characteristics at the same time, reducing the size of the device.