“SR” SERIES BANDSTOP FILTERS
- 1 - 18 GHz
- To 15 Sections
- Bandwidth to 30%
- Fixed and Tunable Versions
- High or Low Power
- Connectors or Pins
SR Series Filters are bandstop filters covering the range 1 to 18 GHz. These filters consist of air-strip line parallel coupled quarter wave resonators. The filters are available with bandwidths from 1% to 30% and with up to 15 sections. The configuration shown in the accompanying drawing covers a frequency range of 7 to 18 GHz. Beneath 7 GHz, the thickness and width of the SR Series will change approximately in accordance with the following formulas:
Thickness = sqrt (7/fo) x 0.5, with fo in GHz
Width = sqrt (7/fo) x 1.2, with fo in GHz
The length will still follow the formula indicated in the drawing, i.e.
Length = 23/fo, fo in GHz
The specification guide curve for bandstop filters can be used to specify insertion loss, required rejection levels, etc. RS Microwave manufactures more non-standard bandstop filters than standard. The photograph illustrates various configurations, from “drop-in” to high power to tunable. The high power units can accept high average power in the stopband region, while the tunable devices employ a patented dual-mode circuit to reduce the number of physical cavities in the filter. Drop-in units can be made available with field replaceable connectors for test purposes.