Extended ground-strip should follow the curvature of the section HC and d r % 2 3 d via . The feed dimensions:· Width w needs to be determined using any standard microstrip line calculator available online.The feed location d 3 from O is %0.25 3 r which may need fine tuning to obtain 50X impedance matching. | C ONCL US I ONThis work presents a new class of miniaturized "hybrid" SIW antenna, which can be used to obtain quasi-omnidirectional radiation patterns. A relative comparison of the present antenna with some earlier SIW, 16,17 metamaterial based miniaturized antennas 18 and PIFA 19 are presented in Table 2. This is self-explanatory revealing its suitability and superiority in terms of the operating bandwidth, size, and gain. ORCIDAkhilesh Mohan http://orcid.org

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