Abstract
This paper presents a 61 GHz narrow-band filter,
implemented with Groove Gap Waveguide (GGW) coupled
resonators. This structure does not require metal contact on
the side walls and, therefore, is very suitable for mm-wave
applications. At these frequencies, the manufacturing process
imperfections become important, and an appreciable response
deterioration can be found using classical microwave waveguides,
such as the rectangular waveguide. The presented filter is a 5 pole
Chebyshev filter, having 2,5% relative bandwidth. An important
novelty in this design is the integration of the coaxial feeding in
the bottom metal piece, which allows even more manufacturing
flexibility. The remarkable good results in terms of insertion
losses (1,6 dB), and return losses (13 dB), of the fabricated
prototype endorse this technology as a serious solution for the
mm-wave band.
