Analytical Design of Wire-Bonded Multiconductor Transmission-Line-Based Ultra-Wideband Differential Bandpass Filters

作者：Jose Sanchez Martinez Juan; Marquez Segura Enrique

来源：IEEE Transactions on Microwave Theory and Techniques, 2014, 62(10): 2308-2315.

DOI：10.1109/TMTT.2014.2345338

• Bandpass filter
• common mode
• coupled lines
• differential filter
• differential mode
• multiconductor transmission lines (MTLs)
• ultra-wideband

A systematic design process of ultra-wideband differential bandpass filters based on wire-bonded multiconductor transmission lines is presented. The topology is thoroughly analyzed by means of analytical design equations that provide some insights into the physical behavior of the proposed structure. Single-and double-section configurations are introduced and exact closed-form design equations are derived to design differential filters with either a Butterworth or Chebyhsev frequency response. To validate the design procedure, two differential filters are designed and fabricated with an equal-ripple fractional bandwidth (FBW) of 100% and 60% (3-dB FBW of 145% and 97%), respectively. The measured differential-mode responses show a good in-band flatness with insertion losses lower than 1 dB and with high common-mode rejection levels greater than 20 dB. Experimental results demonstrate a good agreement with theory and prove that the proposed design methodology is useful for accurate and fast ultra-wideband differential filter synthesis.

• 出版日期2014-10