Band-Pass Filter

Quasi-optical band-pass filters are intended for selecting specified frequencies in the range of mm- and submm-waves. The filters can be used in a variety of applications including laboratory and space research.

The filters are implemented on basis of specially designed multilayer frequency selective microstruc-tures, which resonantly transmit the radiation within a specified frequency band and reflect the out-of-band radiation. We offer a wide choice of high performance band-pass filters with central frequencies up to several THz. The filters exhibit high peak transmission and low out-of-band spectral leakage. To maximize the out-of-band blocking, two filters in series can be easily employed without significant loss-es in a peak transmittance.

Additionally, the filters can be designed according to the customer’s specification. The filter character-istics can be optionally customized. Our filter technology is versatile and can be optimized for a wide range of experimental demands including operation in cryogenic environment.

Frequency range

70 GHz - 3 THz

rel. Bandwidth

15 - 20%


84 - 97%

Out-of-band blocking

23 - 40 dB


50 mm


69mm x 32mm
​(Diameter x Length)

Documentation and attachments