Bandstop filters provide an effective way of suppressing unwanted signals at spot frequencies or over narrow bands. They exhibit very high rejection at the design frequency, together with a broad well-matched passbanda above and below, making them suitable for a variety of transmit and receive applications.
One or more bandstop filters can be combined with a bandpass filter to produce notches in the skirts giving enhanced rejection at spot frequencies in the response. Waveguide units are suitable for high power applications, whilst the more compact coaxial types give excellent performance at low to medium power levels.
Construction is in high conductivity copper or lightweight aluminium alloy, and for extreme environments invar construction ensures excellent temperature stability. Waveguide or coaxial interfaces can be supplied in a variety of configurationts to meet individual requirements.
Performance data
Perf. Data
|
Coaxial
|
Waveguide
|
Centre Frequency
|
100 MHz to 15 GHz
|
3 GHz to 40GHz
|
Waveguide Sizes
|
WG10 to WG22 (R32 to R320)
|
|
Passband Width
|
DC to 18 GHz
|
Full waveguide bandwith
|
Stopband Width
|
5 % max
|
2 % max
|
Rejection
|
80 dB max
|
100 dB max
|
Passband Loss
|
Less than 1dB
|
Less than 0.5 dB
|
Passband VSWR
|
1.5 typical
|
1.25 typical
|
Power Handling
|
Low to medium
|
High
|
Construction
|
Copper, aluminium alloy or invar |
|
External Finish
|
Classic blue stoving |
|
Internal Finish
|
Copper plate (aluminium and invar units) |
|
