Fully Embedded UWB Filter into Organic Packaging Substrate
Sung P. Lim, Jae Y. Park
59th Electronic Components and Technology Conference, 2009. ECTC 2009.
1585 - 1589
In this paper, a compact ultra wideband bandpass filter has been newly designed and implemented by embedding all the passive components into an organic packaging substrate for compact 3.1 - 4.75 GHz UWB system applications. In order to reduce a size of the filter and avoid unwanted EM coupling among the embedded filter circuit elements, it was designed by using a modified 3rd cehbyshev circuit topology and Jinverter transformation technology. It was comprised of three shunt-type LC resonators, two capacitance J-inverters, two extra transmission zero inductors, and one extra transmission zero capacitor. The capacitor and inductors generate finite transmission zeros to enhance rejection characteristics at
independent proper sides. The measured maximum insertion loss in the passband ranged from 3.1 to 4.75 GHz was better than 1.68 dB, with a minimum value of 0.78 dB at 3.75 GHz. And the return loss was higher than 12dB in the passband. The transmission zeros of the measured response occurred at 2.2, and 5.15 GHz, and provided suppressions of 31 dB at 2.4 GHz(ISM band) and 20dB at 5.15 GHz(wireless LAN band), respectively. Group delay was lower than 0.62ns in the passbnad. The size of the designed bandpass filter was 2.9mm x 2.8mm x 0.55mm which was much smaller than the ones fabricated onto organic substrate
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