Abstract
In this paper, three different microstrip slot radiators are proposed on single user equipment (UE) size ground plane providing flexibility for the user to utilize many useful bands such as some lower cellular bands, Sub-6 GHz band, and mm-wave 5G band. First, a 2-port multiple-input-multiple-output (MIMO) antenna (Type-I) utilizing polarization diversity is designed for useful cellular bands from 1.6 -2.2 GHz and 2.5-2.7 GHz (|S11| <; -6dB, |S21| <; -20dB) with a realized gain of around 4 dBi. Second, two 2-port MIMO antennas (Type-II) are designed for sub-6 GHz 5G band from 3.3 - 5 GHz (|S11| <; -10dB, |S21| <; -15dB) with a realized gain around 7 dBi. A new connected meander ground slot is introduced here as a decoupling structure. Third, two circularly polarized 1 × 8 linear arrays (Type-III) is designed for the 5G band from 27 - 29GHz (|S11| <; -10dB) with an adjacent port isolation greater than 20 dB and a realized gain around 12dBiC. The proposed phased array is also implemented using the SiGe RFIC (ADMV4821) based 5G analog beamformer. A beam steering of ±30° is achieved along the array axis. The performances of the prototype are also characterized in the presence of other major metallic components, hand, and head phantom. The simulated and experimental results make the different MIMO antennas and 5G phased arrays enabled prototype as a suitable candidate for future UEs.
Highlights
The quest of fifth-generation (5G) antenna designs have been evolved extensively to cope with the growth in the 5G cellular system to yield a favorable solution for improved data rate, low latency, and enhanced channel capacity [1]
Based on the author’s best knowledge, an approach for the collocated 28 GHz 5G band circular polarization (CP) linear phased array antennas, sub-6 GHz MIMO antenna, and some lower cellular band MIMO antennas based on three novel microstrip slot radiating elements on a single host ground plane are reported here for the first time
It is important to note that all three sets of MIMO antennas are microstrip slot (MS) based radiators excited by microstrip feed lines
Summary
The quest of fifth-generation (5G) antenna designs have been evolved extensively to cope with the growth in the 5G cellular system to yield a favorable solution for improved data rate, low latency, and enhanced channel capacity [1]. Linear polarized (LP) radiators require polarization alignment, which is difficult to achieve for portable/mobile applications at mm-wave bands It was reported in [5] that, the received signal strength at 28GHz can fluctuate drastically while altering the polarization of the receiver and transmitter antennas. 3) Type-III 5G Phased array antennas – A tilted rectangular microstrip slot loop radiator based circularly polarized (CP) linear phased array for 28GHz 5G band antenna is proposed in this work for the first time. Based on the author’s best knowledge, an approach for the collocated 28 GHz 5G band CP linear phased array antennas, sub-6 GHz MIMO antenna, and some lower cellular band MIMO antennas based on three novel microstrip slot radiating elements on a single host ground plane are reported here for the first time
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