This paper describes the design and analysis of five-element planar array antenna of an anti-jamming satellite navigation system. We propose a design of multi-layer patch antenna for Global Positioning System(GPS) L 1 /L 2 dual bands. The proposed antenna has two ports feeding network with a hybrid chip coupler for a broad bandwidth with Right-Handed Circular Polarization(RHCP). The measurement results show the bore-sight gains of 1.10 dBic(L 1 ) and 0.37 dBic(L 2 ) for the center element. The

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... ore-sight gains of an edge element are 0.99 dBic(L 1 ) and -0.57 dBic(L 2 ). At a fixed elevation angle of 30°, antennas show average gains of -2.08 dBic (L 1 ) and -5.33 dBic(L 2 ) for the center element, and average gains of -0.40 dBic(L 1 ) and -2.09 dBic(L 2 ) for the edge elements. The results demonstrate that the proposed array antenna is suitable for anti-jamming applications.