A novel dual frequency and dual circular polarization multilayer microstrip antenna for satellite communication is presented.The proposed antenna can realize right circularly polarized radiation and left circularly polarized radiation simultaneously at 420±1.5MHz and 450MHz±1.5MH by using the Lange-coupler as an orthogonal feeding network.And

the duplex communication is achieved for the single antenna.The patch coupled feeding and additional lumped filtering network improve isolation effectively.In addition

the antenna is constructed with high permittivity dielectric substrate

which can help to reduce the antenna size.The Lange-coupler size is miniaturized (about 74.6%) with the meander-line structure.A good agreement is achieved between the simulation and the experiment results.In the operating frequency band

the isolation is more than 40dB

VSWR is less than 2.0 and the radiation gain of the proposed antenna is larger than 3dBc.The measured results show that both of the 3 dB axial ratio and the 0 dB gain width reach up to 80 degrees.