| 摘要 |
<p>A reflection-type bandpass filter (1) for ultra-wideband radio data communications of the present invention comprises a substrate (2) formed by laminating a conducting layer (3) and a dielectric layer (4), and a microstrip line (5) made of conductor of non-uniform width and provided on the dielectric layer, wherein the distribution in the lengthwise direction of width of the microstrip line is set such that the absolute value of the difference in reflectivity at the frequency f in the region f <3.1 GHz and f >10.6 GHz, and the reflectivity in the region 3.7 GHz ‰ f ‰ 10.0 GHz becomes equal or greater than 10 dB, and the variation of the group delay in the region 3.7 GHz ‰ f ‰ 10.0 GHz becomes within ± 0.2 ns. According to the present invention, a high performance reflection-type bandpass filter for UWB satisfying the FCC regulations can be offered.</p> |
