A novel microstrip lowpass filter having two transmission zeros to get sharp attenuation and wide stopband

• Autores: J. Mo, W. Liu, Zhewang Ma
• Localización: Microwave and optical technology letters, ISSN 0895-2477, Vol. 48, Nº. 11, 2006, págs. 2253-2256
• Idioma: inglés
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• Resumen

  • This paper proposes a novel microstrip four-pole lowpass filter with compact size and excellent frequency property. Two transmission zeros are introduced in its stopband. The first transmission zero is produced nearby the passband and makes a sharp rate of attenuation. The second transmission zero is introduced to increase significantly the stopband width. The positions of the two transmission zeros can be adjusted easily. Although it has a smaller number of circuit elements and a lower insertion loss, the filter shows a frequency response better than that of a five-pole elliptic function filter. The measured filtering characteristics of the filter agree excellently with the simulated results.