Experimental characterization of a 94 GHz LTCC 1×4 microstrip patch antenna array

The electromagnetic modeling and experimental characterization of a 1×4 microstrip patch antenna array designed for 94 GHz applications are presented in this paper. The four antenna elements are fed in phase by a stripline matched T-junction based network. A stripline to grounded coplanar waveguide transition is added for probing. A test structure with a size of just 9.8 × 9.65 mm² was fabricated in a six layer LTCC process. The measured input impedance bandwidth is between 89.9 GHz-100.4 GHz with a measured 3 dB gain bandwidth between 81-99 GHz.