High-frequency radiating element and modified 3 db/90° electronic shifting circuit with circular polarisation for broadband reflectarray device cells

The design of a high-frequency radiating element plus a broadband shifting circuit for reflectarray device cells is provided. The cell design is based on modified broadband 3 dB/90° reflecting circuit interlacing polarisation, along with a multilayered planar radiating element. The basics of the structure are to capture the signal at each cell of the reflectarray, to introduce the proper phase shift by means of the modified 3 dB/90° shifter and to re-radiate the signal again towards the radiating direction. This device reduces the complexity of the reflectarray cells in terms of design and manufacturing, enabling it to deal with circular polarisation in an easily affordable manner. The complete design of the unitary cell is provided.