Microstrip dual-band bandstop filter to suppress DGS, DMB, GPS, UTMTS, WCDMA, WIBRO, and WLAN bands

作者：Faraji Tayeb^*; Hazeri Ali Reza

来源：Microwave and Optical Technology Letters, 2012, 54(4): 854-856.

DOI：10.1002/mop.26684

• dual-band microstrip bandstop filter
• DGS
• DMB
• GPS
• UTMTS
• WCDMA
• WIBRO
• WLAN bands

In this article, a new microstrip dual-band bandstop filter (DSBF) is proposed. By combining coupled three-line microstrip structures, single transmission lines, and coupled open-end stubs, a DSBF with high-rejection levels and sharp frequency responses in the stopbands is found. The proposed DSBF is optimized to suppress DGS, DMB, GPS, UTMTS, WCDMA, WIBRO, and WLAN bands. The insertion loss in the two stopbands is >20 dB from 1.52 to 2.77 GHz and from 4.88 to 5.8 GHz. Four transmission zeros are realized at 1.7, 2.7, 5.1, and 5.8 GHz. Moreover, return loss of passband between the first and second stopbands is excellent. The proposed DSBF is simulated (by ADS simulator) and fabricated on a substrate with a thickness of 0.635 mm and a relative dielectric of 10.2. Here is an excellent agreement between simulation and measurement results. The overall size of the DSBF is 17.538 x 14.4 mm2.

• 出版日期2012-4