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| Main Authors: | , , |
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| Format: | Artículo Open Access |
| Published: |
Wiley
2025
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| Subjects: | |
| Online Access: | https://onlinelibrary.wiley.com/doi/10.1002/mop.70340 |
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Table of Contents:
- Design of a Compact Microstrip Box‐Like Bandpass Filter With High‐Frequency Selectivity and Excellent Stop‐Band Performance Jun‐Mei Yan An‐Qi Tong Liang‐Zu Cao Microwave and Optical Technology Letters ABSTRACTThis paper presents a compact box‐like microstrip bandpass filter. It features high‐frequency selectivity and excellent stopband performance. It comprises a half‐wavelength stepped‐impedance resonator (SIR) and three quarter‐wavelength SIRs. The half‐wavelength and quarter‐wavelength SIRs are hybrid adopted. Therefore, the second‐order parasitic passband is suppressed effectively. Simultaneously, through controlling the ratio of the stepped impedance, the third‐order resonant frequencies are separated properly, which effectively suppresses the third‐order parasitic passband. The filter has a box‐like coupling topology, which can introduce one transmission zero, and its position can be located at arbitrary side of the passband. Furthermore, tapped‐line is used to accomplish the external coupling, which can introduce two transmission zeros for the so‐called zero‐feeding structure. The three transmission zeros give the filter a high‐frequency selectivity. Additionally, the carefully arranged geometrical layout with box‐like coupling topology provides the filter with a miniaturized size. A prototype filter centered at 1.8 GHz, with FBW of 4.0%, is designed, fabricated, and measured. Its structure, operational mechanism, and design steps are discussed in detail. The simulated and measured results are given, and a good agreement between them verifies the effectiveness of the proposed filter and design method. 10.1002/mop.70340 http://onlinelibrary.wiley.com/termsAndConditions#vor