A Compact SIW Mixer For Millimeter-Wave Applications

The present paper highlights an innovative broadband millimeter-wave single balanced diode mixer which is designed using a newly designed 90 substrate integrated waveguide (SIW) coupler and two cavity (SIW) filters. The mixer covers RF/LO operating frequency range which fluctuates between 10 to 12 GHz and IF port covers 2GHz. The proposed mixer exhibits a fairly low conversion loss of less than 10 dB and high port to-port isolations over the frequency band of interest as the simulated results make clear. Furthermore, the two cavities SIW filter is embedded to achieve a better image frequency suppression of about 28dB.DOI:http://dx.doi.org/10.11591/ijece.v4i6.668

Novel Low-Cost Phase Shifters For Millimeter Wave Applications

Novel low-cost phase shifter that hybridize stepwise and continuously variable phase shifting mechanisms are presented in this work. A combination of straight and curved waveguides is used to realize the step-wise phase shifts, while the variable phase shifts are achieved by inserting one or more layers of metallic vias in the waveguide to achieve a differential phase up to 90°. An alternative scheme, which achieves the phase shift in the entire 0° to 360° range by mechanically changing the length of a telescopic guide, is also described