For seamless communication in millimeter-wave (mm-wave) transmission systems, the robustness against link blockage and user mobility should be guaranteed. Cooperative joint network design over conventional microwave bands and mm-wave bands is essential in future mm-wave WLANs (e.g., IEEE 802.11ay) and 5G cellular networks, and hence understanding the discrepancy between the propagation properties at those frequency bands is crucial. In this letter, the angle-of-arrival characteristics at mm-wave band (60 GHz) and microwave band (2.4 GHz) in indoor environments are presented. From the measurement results, it was seen that the lineof-sight and first-order reflected paths agree well each other, but diffraction and scattering are observed only at microwave band. It was also shown that the angular spreads at mm-wave band was about 25 degrees smaller than those at microwave band.

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