For the measurement of the intra-vehicle signal propagation in MMW band we utilized two different MMW antennas.
Open-ended waveguide antenna
It is a simple antenna represented by an open waveguide flange (WR-15), see Figure 1. Its properties are depicted in Figure 2 and Figure 3. The advantage of this antenna is simplicity, a good impedance matching, and relatively flat main lobe of the radiation pattern.
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Slot antenna array
For the measurement of the intra-vehicle signal propagation in frequency band 55–65 GHz, we have developed an antenna (Figure 4) with a dipole-like radiation pattern. Compared with the open-ended waveguide antenna, this antenna could cover a larger number of reflected waves in the car compartment. The antennas consist of a group of three longitudinal slots placed in both broad walls of a substrate integrated waveguide (SIW). An SIW slot antenna is naturally a narrow-band structure; however, using different self-resonant frequencies of the slots in the group ensures operating in the desired frequency band. The parameters are summarized in Figure 5 and Figure 6. For details please refer to [1].
Related publications:
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MIKULÁŠEK, T.; LÁČÍK, J.; RAIDA, Z.
SIW slot antennas utilized for 60- GHz channel characterization
Microwave and Optical Technology Letters, 2015, vol. 57, no. 6, s. 1365-1370. ISSN: 1098-2760.
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