Fully Dielectric Rod Antenna Arrays with High Permittivity Materials

In this work, we investigate the effect of high permittivity materials for a fully dielectric 1 × 4 antenna array based on a multimode interference power divider. Designed at W-band, from 95 to 105 GHz, two plastic/ceramic composites L300 and L440 from Premix are used with ε
_r
= 3 and ε
_r
= 4.4, respectively. The results are compared to our published design made out of Rexolite with ε
_r
= 2.53. Compared to Rexolite, the antenna array can be already scaled down to 52% of the sectional area using L440. The input reflection is below -15 dB over the whole frequency range for both arrays. Measurement and simulation of the antenna patterns are in good agreement, with measured antenna gains between 14 to 16 dBi.