Differential-Fed, Dual-Aperture Based, Quasi-End-Fire 5G mmWave Antenna-in-Package Design

Abstract

A low-profile, wideband antenna-in-package (AiP) design is proposed for 5G mmWave mobile applications. The aperture-coupled feeding incorporated with the microstrip feed line through the slots in the ground is used to excite the patch antenna. Firstly, a thin quarter-wave shorted patch antenna (QW-SPA) with the dominant 𝑇𝑀 1/2,0,0 𝑧 mode is realized. To broaden the operating band, the QW-SPA is extended along its resonant length so that the 𝑇𝑀 1,0,0 𝑧 mode can also be excited. The offset introduced into the two slots together with the additional shorting via wall are applied to enhance the beam tilt toward the end-fire direction. The proposed single-patch design shows a wide fractional bandwidth, covering the 5G mmWave band n257 (26.5-29.5 GHz). Furthermore, to increase more beam tilt, the differential-fed, two-patch sub-array formed by two QW-SPAs spaced a half-wavelength at 28 GHz apart is also presented. Compared with the singlepatch design, the beam-tilt enhancement of around 10-27 degrees is obtained over the desired frequency band with the peak gain of around 8.2 dBi for the sub-array AiP design.INDEX TERMS patch antennas, antenna-in-package (AiP), fifth generation (5G) antennas, mmWave, beam tilt, thin quasi-end-fire antennas, aperture-coupled feed, differential feed

A dual-band U-shaped microstrip antenna for 5G mmWave applications

“…Therefore, several antenna were presented at 5G sub-6GHz and 5G mmWaves [2][3][4][5][6][7][8][9][10]. In [2], a small, wideband, partially slotted ground, rectangular-patch antenna working at sub-6GHz is presented.…”

“…In [4], a 5G broadband printed dipole antenna operates at 26.5-38.2 GHz with gain around 5dBi is presented. A wideband, low-profile antenna-in-package (AiP) design is presented for 5G mmWave n257 (26.5-29.5 GHz) band mobile applications in [5]. [6] presents an antenna-in-package (AiP) with endfire and dual polarisation operating at 28 GHz.…”

“…The suggested antenna can operate in the frequency ranges of 36-41.5GHz and from 26-30GHz. The antennas presented in [2][3][4][5][6][7][8][9][10] function well, but the majority of them are single band and relatively complex. So, there is a need for design of simple antennas and dual-band antennas for 5G mmWave applications.…”