Simulative and Experimental Investigations of Different Methods to Realize a Phase Shift in Transmit-Array Unit Cells.

Kurzfassung

In this thesis, different methods of establishing a switchable phase shift in transmitarray unit cells are evaluated. In contrast to current state-of-the-art literature providing different concepts, this work aims to design transmitarray unit cells with the ability of performing in receiving and transmitting full-space beam-steering. The desired frequency range lies in C-band, with a center frequency of 5.3 GHz and a bandwidth of 400 MHz. The investigation includes a theoretical modeling and simulation of the switched delay line phase shifters, as well as the integration in the unit cell design. Furthermore, hardware demonstrators are assembled and their function is experimentally verified. A phase deviation of 8° is achieved for the grounded coplanar line phase shifter. The results of a switchable delay line phase shifter, obtained from the simulations and measurements of the prototypes, indicate that especially the proposed approach with grounded coplanar lines is promising.