High gain 60 GHz LTCC chain antenna array with substrate integrated waveguide feed network

A design of a traveling wave chain antenna array operating at 60 GHz frequency band is presented in this paper. The antenna consists of several parallel microstrip chains printed on an LTCC substrate. The array feed network is constructed using substrate integrated waveguide (SIW) technology to minimise the transmission line losses. The presented design is scalable in frequency and in size, and a high antenna gain can be achieved with a large array. A test structure of size 27 mm × 22 mm × 1.1 mm is realised on Ferro A6-M LTCC. The antenna including the WR-15 to SIW transition has the measured maximum gain of 22 dBi at 62 GHz. The simulated maximum radiation efficiency of the antenna alone is 74%.