Muchhal Nitin, Kumar Abhay, Tewari Nidhi, Kalia Samriti, Srivastava Shweta
Department of ECE, Jaypee Institute of Informaton Technology, Noida 201309, UP, India.
Micromachines (Basel). 2024 Nov 28;15(12):1440. doi: 10.3390/mi15121440.
A substrate-integrated waveguide (SIW) bandpass filter (BPF) with extraordinary selectivity and an adequate upper stopband for C-band Satellite Communication (SATCOM) applications is proposed in this paper. The design comprises comb-shaped slots engraved on a half-mode SIW (HMSIW) that constitute a multimode resonator (MMR). Its performance is further ameliorated by applying the first and second iterations of the Minkowski fractal curve in the ground plane as a defected ground structure (DGS). The Minkowski fractal has advantages in terms of better bandwidth and miniaturization. The filter is first simulated using the commercial full-wave electromagnetic simulator HFSS v19 and then fabricated on a 0.062'' (1.6 mm) FR4 with dielectric constant ε = 4.4. The measured results are comparable with the simulated ones and demonstrate that the BPF has a resonant frequency (f) of 4.75 GHz, a 3 dB bandwidth of 770 MHz (fractional bandwidth of 21.4%), an insertion loss of 1.05 dB, and an out-of-band rejection (in the stopband) of more than 28 dB up to 8 GHz, demonstrating a wide and deep stopband. Using the multimode resonator (MMR) technique, a wide bandwidth has been achieved, and by virtue of using half-mode SIW (HMSIW), the proposed BPF is compact in size. Also, the fractal DGS aids in better stopband performance.
本文提出了一种具有卓越选择性且在C波段卫星通信（SATCOM）应用中具有足够上阻带的基片集成波导（SIW）带通滤波器（BPF）。该设计包括刻在半模SIW（HMSIW）上的梳状槽，这些槽构成了一个多模谐振器（MMR）。通过在接地平面上应用闵可夫斯基分形曲线的第一次和第二次迭代作为缺陷接地结构（DGS），其性能得到了进一步改善。闵可夫斯基分形在带宽和小型化方面具有优势。该滤波器首先使用商业全波电磁模拟器HFSS v19进行仿真，然后在介电常数ε = 4.4的0.062英寸（1.6毫米）FR4上制作。测量结果与仿真结果相当，表明该BPF的谐振频率（f）为4.75 GHz，3 dB带宽为770 MHz（分数带宽为21.4%），插入损耗为1.05 dB，在高达8 GHz的频率范围内带外抑制（在阻带中）超过28 dB，显示出宽而深的阻带。通过使用多模谐振器（MMR）技术，实现了宽带宽，并且由于使用了半模SIW（HMSIW），所提出的BPF尺寸紧凑。此外，分形DGS有助于实现更好的阻带性能。
