Compact GLONASS Band-Pass Filter Based on Waveguide with Resonance Membranes

In this article the compact band-pass filters constructions with low losses for L1 and L2 GLONASS frequency bands are presented. The developed filters are based on rectangular waveguide with resonance waveguide-slot membranes. The frequency characteristics of the researched filters are presented. The insertion losses of the filter for L1-band (1.593–1.61 GHz) is no more than 0.576 dB, the reflection coefficient level doesn't exceed −19.3dB. The insertion losses of the filter for L2-band (1.237–1.254 GHz) is no more than 1.073 dB, the reflection coefficient level doesn't exceed 19.4dB. The developed filters behavior in frequency band 1–5 GHz was considered. The filter for L1 band has wide sideband, it is from 3.57 GHz to 4.96 GHz with center frequency 4.27GHz. A filter band-pass flatness is 0.446 dB. The filter for L2 band has some narrow sidebands. The developed filters based on waveguide with waveguide-slot membranes have low losses in operating bands, small size, production manufacturability and can be widely used in GLONASS/GPS navigation systems.