A MIXED CROSS-COUPLING MICROSTRIP FILTER WITH MULTIPLE TRANSMISSION ZEROS

作者：Ouyang X^*; Chu Q X

来源：Journal of Electromagnetic Waves and Applications, 2011, 25(11-12): 1515-1524.

DOI：10.1163/156939311797164936

• Cross-coupling techniques
• Cross-couplings
• High rejections
• Input and outputs
• Measured results
• Multiple transmission zeros
• Number of transmissions
• Transmission zeros

A novel three-pole microstrip filter with four transmission zeros is proposed. The coupling between input and output hairpin-comb resonators of the trisection filters, regarded as the cross-coupling, provides a close-to-band transmission zero. This cross-coupling component is also a mixed EM coupling component, which introduces another adjustable transmission zero beyond the passband. Due to the combination of the cross-coupling technique and the mixed electric and magnetic (EM) coupling approach, multiple transmission zeros can be achieved, which means a high rejection level. Therefore, fewer resonators are needed to obtain the same number of transmission zeros than inline filters. The measured result is in good agreement with the simulated S-parameters.

• 出版日期2011
• 单位华南理工大学