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strange007

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This is a well written paper on the topic of multi-GNSS patch antennas where the authors make use of a double-sided metasurface to increase the antenna¡¯s axial ratio bandwidth. With that, the patch antenna can receive signals from all ranges of frequencies transmitted by the four GNSSs, 1) GPS, 2) GLONASS, 3) BeiDou and 4) Galileo.  The paper is organised well and easy to follow. I have a few remarks that the authors may consider in the revision:
(1) While discussions on the 4 GNSSs are given, no mention is made regarding the other two Regional Navigation Satellite Systems (RNSS), namely, 1) the Japanese QZSS and 2) the Indian NAVIC (IRNSS). Can the proposed patch antenna receive signals from these types of satellites as well?
(2) Positioning and navigation users are very much concerned about the presence of ¡®multipath¡¯ in their observed GNSS signals. How does the proposed antenna take care of multipath? Can the impact of multipath be mitigated(¼õÇá) by using such patch antennas?  
(3) Numerical results: it would be good, next to Figures 3-11, to include a discussion on ¡®multipath¡¯ as well as GNSS-derived positioning solutions. This aspect is missing in the paper.

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