DUAL-BAND CIRCULARLY POLARISED MICROSTRIP ANTENNA Russian patent published in 2013 - IPC H01Q1/38 

FIELD: radio engineering, communication.

SUBSTANCE: dual-band circularly polarised microstrip antenna has a metal shield, two radiating elements in form of rectangular metal plates placed on over the other in parallel to the metal shield and separated by dielectric substrates, and a coaxial transmission line with one feed point; linear dimensions of the sides of the plates are defined by relationships X_L=(0.94-0.97)×Y_L; X_u=(0.94-0.97)×Y_u, where X_L, Y_L, and X_u, V_u are dimensions of the sides of the lower and upper plates, and the location of the feed point is defined by the following relationships: N_L=(0.35-0.40)×X_L; M_L-(0.25-0.30)×Y_L; N_u=(0.32-0.36)×X_u; M_L=(0.23-0.28)×Y_u, where N_L, M_L and N_u, M_u are coordinates of the feed point relative edges of the lower and upper plates, respectively.

EFFECT: design of a small-sized dual-band circularly polarised microstrip antenna which is suitable for operation with a single-input receiver.

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