# Low noise amplifier with integrated balanced antenna for 60 GHz wireless communications

Jian Zhang, George Goussetis, Laurence Richard, Guochi Huang, Vincent Fusco, Franz Dielacher

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

## Abstract

The implementation of a dipole antenna co-designed and monolithically integrated with a low noise amplifier (LNA) on low resistivity Si substrate (20 Ω . cm) manufactured in 0.35 μm commercial SiGe HBT process with f T/fmax of 170 GHz and 250 GHz is investigated theoretically and experimentally. An air gap is introduced between the chip and a reflective ground plane, leading to substantial improvements in efficiency and gain. Moreover, conjugate matching conditions between the antenna and the LNA are exploited, enhancing power transfer between without any additional matching circuit. A prototype is fabricated and tested to validate the performance. The measured 10-dB gain of the standalone LNA is centered at 58 GHz with a die size of 0.7 mm $\times$ 0.6 mm including all pads. The simulated results showed antenna directivity of 5.1 dBi with efficiency higher than 70%. After optimization, the co-designed LNA-Antenna chip with a die size of 3 mm × 2.8 mm was characterized in anechoic chamber environment. A maximum gain of higher than 12 dB was obtained.

Original language English 6774466 3407-3411 5 IEEE Transactions on Antennas and Propagation 62 6 https://doi.org/10.1109/TAP.2014.2312202 Published - 2014

## Keywords

• Dipole antenna
• low noise amplifier
• MMIC antenna co- design
• SiGe HBT