Via-less X-band stacked filters on Duroid substrate

摘要: This paper presents the design, fabrication and measurements of 4 5 stacked bandpass filters. The center frequencies these filters are respectively 7875 MHz, 8675 9550 10600 11850 MHz with a relative bandwidth around 10%: it results in total coverage [7.5–12.4] GHz band. These fabricated using conventional etching techniques on low-cost flexible RT/Duroid 6010.2LM substrate (e r = 10.2, tan δ 0.0023) coated an 9-µm thick laminated copper layer. two different configurations (2×2 or 5×1) thanks to stripline configuration which also allows reduction length resonators. Therefore, overall compact size can be achieved dimensions each filter less than 4.9 mm × 4.2 mm. S-parameters have been measured optimized via-less CPW-to-stripline transitions: return loss better 15 dB insertion varying from 3.6 only 1.3 good agreement simulated results.