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28 GHz Monolithic Transmitter on GaN Chip for 5G Application

Authors:
Rajinikanth Yella
Krishna Pande
Ke Horng Chen
Edward Chang

Keywords: Yagi antenna;Filter; Mixer;Power amplifier; 5G.

Abstract:
5G standard is targeting much higher data rates as compared to existing wireless technologies to accommodate the ever-increasing demand for faster wireless applications. A Transmitter is required to implement a 5G system. In this paper, we are presenting a 28 GHz novel monolithic transmitter architecture on GaN substrate that offers SWAP-C advantages. The transmitter contains a Yagi antenna, which consists of three directors, two drivers, a strip line feed, a substrate and a ground plane. According to simulation results, the designed Yagi antenna has a compact size and low loss at the selected frequency of 28 GHz. At this frequency, its return loss, gain, and beam width are -38 dB, 8.69 dB, and 57.2 degrees, respectively. The second component in the monolithic chain is a bandpass filter (BPF), which offers enhanced selectivity and stopband suppression on GaN substrate. The Bandpass filter has a minimum insertion loss of 0.6dB at 28GHz. The rejection level is higher than 10 dB in the stop band. Further, a collaborative simulation of 28 GHz mixer for upconversion with CLASS-E power amplifier (PA) with integrated octature structure to achieve robust load insensitivity is presented. In this paper to design high-efficiency PA, we implemented harmonic load pull at both the input and output of the active device to obtain optimum impedances at fundamental and second-harmonic frequencies. After an iterative process, the optimum input and output impedances are obtained. In addition, we also implemented cascaded octature power cell structure, the proposed balanced PA achieves a saturated output power (Psat) of 13.5dBm and a maximum Power Added Efficiency (PAEmax) of 55%. It consumes 210mW power. The presented transmitter configuration is designed on a GaN substrate with a thickness of 0.8 mm, permittivity (Er) of 9.7, and loss tangent (TanD) of 0.025. Based on its performance at 28 GHz, the designed Transmitter is being developed for the 5G application.

Pages: 17 to 22

Copyright: Copyright (c) IARIA, 2018

Publication date: April 22, 2018

Published in: conference

ISSN: 2308-4480

ISBN: 978-1-61208-624-8

Location: Athens, Greece

Dates: from April 22, 2018 to April 26, 2018