Xie Tingting, Gong Pengwei, Cheng Xiaohe, Xiu Tao, Yao Yuan
Beijing Institute of Radio Metrology and Measurement, Beijing 100854, China.
School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Sensors (Basel). 2024 Oct 15;24(20):6640. doi: 10.3390/s24206640.
In this paper, a conductor-backed coplanar waveguide with sine edges (CBCPW-SE), consisting of a conductor-backed coplanar with periodic sine edges supported by a dielectric substrate, is proposed as a promising new transmission line (TL) at millimeter-wave and terahertz frequencies. This configuration offers a distinct advantage by maintaining a constant input impedance of 50 Ω across a broad frequency spectrum, eliminating the necessity for any additional impedance matching transitions, thereby enhancing the overall efficiency and simplicity of the transmission system. To verify the design, the CBCPW-SE was fabricated and measured. The measurement results demonstrate that, from 10 MHz to 100 GHz, the insertion loss is less than 0.1 dB/mm and the reflection coefficient is better than -10 dB. The measured S21 (dB) for a 50 mm-long CBCPW-SE section is less than -5 dB from 10 MHz to 100 GHz. The measured group delay per unit length of the trace is 3.4-5 ps, ranging from 10 MHz to 100 GHz. Moreover, the measured group velocity dispersion (GVD) approaches zero, signifying the minimal temporal spreading of the signal components, a crucial aspect for maintaining signal integrity and facilitating high-speed data transmission.
本文提出了一种具有正弦边缘的导体背衬共面波导（CBCPW-SE），它由一个由介质基板支撑的具有周期性正弦边缘的导体背衬共面组成，是毫米波和太赫兹频率下一种很有前景的新型传输线（TL）。这种结构具有显著优势，即在很宽的频谱范围内保持50Ω的恒定输入阻抗，无需任何额外的阻抗匹配转换，从而提高了传输系统的整体效率和简单性。为了验证该设计，制作并测量了CBCPW-SE。测量结果表明，在10MHz至100GHz范围内，插入损耗小于0.1dB/mm，反射系数优于-10dB。对于一段50mm长的CBCPW-SE，在10MHz至100GHz范围内测得的S21（dB）小于-5dB。在10MHz至100GHz范围内，测得的走线每单位长度的群时延为3.4 - 5ps。此外，测得的群速度色散（GVD）接近零，这意味着信号分量的时间展宽最小，这对于保持信号完整性和促进高速数据传输至关重要。
