PURPOSE: A circular polarization micro-strip slot antenna is provided to attach simultaneously a microwave circuit by connecting electrically an antenna device of a grounding plate with a power feeding line. CONSTITUTION: A circular polarization micro-strip slot antenna comprises the following structure. A grounding plate(11) is formed on a PCB(Printed Circuit Board)(10). A slot(12) of Z type is formed on the grounding plate(11). A power feeding line(13) is formed at a lower direction of the PCB(10). A length(L1) of a short slot stub of the slot(12) is shorter than a length(L2) of a long slot stub of the slot(12). The length of the stub ejected from the slot(12) is /4 of a resonance frequency.
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