Development of Packaged Ultra-Wideband Bandpass Filters

作者：Han Liang^*; Wu Ke; Zhang Xiupu

来源：IEEE Transactions on Microwave Theory and Techniques, 2010, 58(1): 220-228.

DOI：10.1109/TMTT.2009.2036399

• Bandpass filter
• interdigital capacitor
• microstrip
• size compactness
• stub-loaded resonator
• ultra-wideband (UWB)

In this paper, we present a very compact ultra-wideband (UWB) filter (patent pending), which is integrated in a commercial leaded package. This UWB filter is designed through quasi-equally allocating the first three resonant frequencies of the stub-loaded resonator. Input/output excitation is realized by a technique of wire-bonded interdigital capacitors for obtaining strong wide-band coupling. After formulating the resonance conditions and analyzing the characteristics of the stub-loaded resonator, an equivalent-circuit topology is developed and a single-stage prototype is fabricated. Measured results agree well with the results generated from both circuit and full-wave simulations. In order to improve the selectivity, two stages of stub-loaded resonators are cascaded. A two-stage prototype is then assembled in a commercial leaded package and measured with a test fixture. Both simulation and measurement results validate our proposed design methods and packaging solutions. This filter is the first demonstration of integrated UWB filters with a commercial package, which can be conveniently applied in UWB communication and radar systems.

• 出版日期2010-1