Microstrip ring resonator bandpass filters using ceramic substrate

✍ Scribed by Yuan-Bin Chen; Cheng-Liang Huang; Shih-Sheng Liu; Shih-Hung Lin

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 171 KB
• Volume: 52
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.24847

✦ Synopsis

The miniaturization of ring bandpass filters by employing high-permittivity ceramic substrates (with respective dielectric constants of 9.7 and 23.5) are investigated. Microwave dielectric ceramics with high permittivity are commonly applied in several microwave communication components. With the advantages of compact size, high-permittivity ceramics can be used as the substrate for bandpass filters. Moreover, the fundamental characteristics of newly developed compact square-ring resonators have also been described and applied to the design of bandpass filters. In this paper, the designed square-ring resonators structures are simulated using an IE3D simulator. The responses of the fabricated bandpass filters using Al 2 O 3 (e r ¼ 9.7, tan d ¼ 0.000036) and 0.875Mg 0.95 Zn 0.05 TiO 3 -0.125Ca 0.8 Sm 0.4/3 TiO 3 (e r ¼ 23.5, tan d ¼ 0.000021) ceramic substrates are designed at the center frequency of 2.4 GHz. This compact size, low loss bandpass filter should be useful in many wireless communication systems.