Low Profile Dual-Band Shared Aperture Array for Vehicle-to-Vehicle Communication

In this paper, we present a non-standalone dual-band shared aperture antenna array that operates at both the current Dedicated Short Range Communications (DSRC) band (viz. 5.9 GHz) and the future 5G millimeter-wave (mm-wave) band (viz. 28 GHz) allocated for vehicle-to-vehicle (V2V) communications. The design consists of a 2 x 2 differentially fed patch array operating at 5.9 GHz, co-printed with a 1 x 2 series fed array operating at 28 GHz on a single layer substrate. In particular, the shared aperture array operates from 5.84-5.94 GHz (DSRC band) with a 100 MHz impedance bandwidth and from 27.75 - 28.47 GHz (5G mm-wave band) with a 720 MHz impedance bandwidth. Gain improvement of similar to 1.44 dB at 28 GHz is observed as a result of the higher order modes generated by the 5.9 GHz array. The shared aperture array was fabricated and measured showing a gain of similar to 9.97 dBi at 5.9 GHz and similar to 12.3 dBi at 28 GHz. The ports of the array are highly isolated with measured isolation >55 dB at the DSRC band and >33 dB at the 5G mm-wave band.

Automated summary

This paper presents a non-standalone dual-band shared aperture antenna array that operates in both the DSRC and 5G mm-wave bands, achieving high impedance bandwidth and gain. The design includes two differentially fed patch arrays operating at different frequencies on a single layer substrate.