Abstract
A novel ultra-wideband (UWB) bandpass filter that is capable of integrating multiple notch bands is proposed in this paper. A multilayer nonuniform periodical structure, which can generate multiple transmission zeros, is deployed in the filter design to improve the selectivity and upper stopband performance of the filter. Short-circuited stub resonators are then integrated to obtain multiple notch bands. The compact footprint of the filter is achieved. UWB filters of this type without a notch and with single-, double-, and triple-notch bands are designed to meet the Federal Communications Commission-defined UWB indoor limit. The designed filters are verified by experiments and fabricated by using multilayer liquid-crystal polymer lamination technology. Both full-wave simulated and measured results are presented and good agreement between them is observed. The proposed filter has good performance and is attractive for UWB communication and radar systems. © 2009 IEEE.
| Original language | English |
|---|---|
| Article number | 5337961 |
| Pages (from-to) | 3080-3088 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Microwave Theory and Techniques |
| Volume | 57 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - Dec 2009 |
Keywords
- Bandpass filter
- Liquid-crystal polymer (LCP)
- Microstrip filters
- Microwave filters
- Ultra-wideband (UWB)