Article

A High-Power S-Band Filter (Correspondence)

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Abstract

This note describes the measured performance of a high-power S-band "waffleiron" filter. Techniques for designing varying-impedance corrugated waveguide filters in rectangular waveguide have been available for some time [1 ]. If propagation is restricted to the dominant TE<sub>10</sub> mode, these filters have wide well-matched pass bands and wide high-attenuation stop bands. Unfortunately, the filters may have spurious transmissions in the stop band when power is incident upon them in other modes, such as TE<sub>20</sub> or TE<sub>30</sub>, if the guide wavelength of these modes at the stop band frequencies is equal to the guide wavelength of the TE<sub>10</sub> mode at the pass-band frequencies of the filter.

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... Waffle iron filters [17], [18] are the go-to solution when a very wide frequency band needs to be covered, combining all the pass and stop bands required for a given application. Although attractive for its filtering properties, this solution is difficult to manufacture at mm-wave frequencies, resulting usually in high cost and limited integration. ...
... As opposed to conventional periodic structures such as the waffle iron filter [17], [18], which exhibit a symmetry in one of their axes, a periodic structure is said to be glide-symmetric if it remains invariant with respect to a translation of half-a-period and a mirroring. This is a particular case of higher symmetries and it can be expressed mathematically for the one-dimensional case with period [24] as follows ...
... The comparison between the well-known waffle iron filter [17], [18] and the proposed waveguide filter based on glide symmetry starts with the comparison at unit cell level. The fields in a periodic structure are also periodic except from a complex constant accounting for the phase delay and attenuation in each period, as shown in Equation 3. ...
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Design Criteria for Microwave Filters and Coupling Structuress
  • S B Cohn
  • E M T Jones
  • C Flammer
  • B M Schiffman
Electromagnetic Fields
  • E Weber
Schiffman Design Criteria for Microwave Filters and Coupling Structuress
  • S B Cohn
  • E M T Jones
  • C Flammer