设计具有可控衰减极的 CRLH-TL BPF

Atsuya Hirayama, Hinata Ishikawa, Takanobu Ohno
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引用次数: 0

摘要

本研究设计了使用左右手复合传输线(CRLH-TL)的紧凑型可控极谐振器和带通滤波器(BPF)。CRLH-TL 中的分布式恒定线采用了分接耦合技术,一个分接耦合存根加载了左手(LH)电路。当存根的输入感抗发散时,就会产生衰减极。在分接耦合 CRLH-TL 谐振器中,衰减极可通过调整电路参数控制在所需的低于或高于谐振频率的区域频率上。此外,CRLH-TL 谐振器构建的 BPF 是根据滤波器设计理论设计的,衰减极位于比负一阶频率更低或更高的区域频率。使用 MEGTRON6 R-5775 ($\varepsilon _\text {r}$$ : 3.7, h: 0.63 mm, t: 18 μm)、片式电容器和导线电感器制作了具有微带结构的 BPF。仿真结果表明,CRLH-TL BPF 近似满足所需的特性,即我们可以设计出在比谐振频率更低和更高的区域频率上衰减极点可控的 CRLH-TL BPF。测量结果与模拟结果非常吻合。负一阶频率产生于 2.00 GHz,带宽为 133 MHz,即分数带宽为 6.65%。与传统的半波长($\lambda /2$$)openstub 相比,BPF 中谐振器的长度分别缩短了 81.5% 和 75.0%。\乘以 0.17 $$lambda_text{g}$$。因此,分接耦合 CRLH-TL 实现了具有两个可控衰减极的紧凑型 BPF。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design of CRLH-TL BPF with controllable attenuation poles
Compact and pole-controllable resonators and bandpass filter (BPF) using a composite right/left-handed transmission line (CRLH-TL) are designed in this study. The distributed constant line in the CRLH-TL has applied a tap-coupling technique, and one tap-coupled stub is loaded with the left-handed (LH) circuit. Attenuation poles are generated when the input susceptance of the stub diverges. In the tap-coupled CRLH-TL resonator, the attenuation pole is controlled at either the desired lower or higher region frequency than a resonant frequency by adjusting the circuit parameters. Also, the BPF constructed by the CRLH-TL resonators is designed based on a filter design theory, where the attenuation poles are located at lower and higher region frequencies than a negative-first-order frequency. The BPF with microstrip structure is fabricated using MEGTRON6 R-5775 ( $$\varepsilon _\text {r}$$ : 3.7, h: 0.63 mm, t: 18 μm), chip capacitors, and wire inductors. The simulated results show that the desired characteristics are approximately satisfied, i.e., we can design the CRLH-TL BPF which is controllable for the attenuation poles at both lower and higher region frequencies than a resonant frequency. The measured results are good agreement with the simulation. The negative-first-order frequency is generated at 2.00 GHz with 133 MHz bandwidth, i.e., the fractional bandwidth is 6.65 %. The resonator lengths in the BPF are shortened by 81.5 % and 75.0 % in comparison with a conventional half-wavelength ( $$\lambda /2$$ ) openstub, and the size of the fabricated BPF is 0.18 $$\lambda _\text {g} \times$$ 0.17 $$\lambda _\text {g}$$ . Therefore, a compact BPF with two controllable attenuation poles is realized by the tap-coupled CRLH-TL.
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