In this letter, a dual-band 8x8 MIMO antenna that
operates in the sub-6 GHz spectrum for future 5G multiple-input
multiple-output (MIMO) smartphone applications is presented.
The design consists of a fully grounded plane with closely spaced
orthogonal pairs of antennas placed symmetrically along the long
edges and on the corners of the smartphone. The orthogonal
pairs are connected by a 7.8 mm short neutral line for mutual
coupling reduction at both bands. Each antenna element consists
of a folded monopole with dimensions 17.85 x 5mm2 and can
operate in 3100-3850 MHz for the low band and 4800-6000 MHz
for the high band ([S11] Â -10dB). The fabricated antenna
prototype is tested and offers good performance in terms of
Envelope Correlation Coefficient (ECC), Mean Effective Gain
(MEG), total efficiency and channel capacity. Finally, the user
effects on the antenna and the Specific Absorption Rate (SAR)
are also presented.
In this paper, an 8×8 Multiple Input Multiple
Output (MIMO) antenna design for Fifth Generation (5G) sub-
6GHz smartphone applications is presented. The antenna
elements are based off a folded quarter wavelength monopole
that operate at 3.4-3.8GHz. Isolation between antenna elements is provided through physical distancing. The fabricated antenna prototype outer casing is made from Rogers R04003C with dimensions based on future 5G enabled phones. Measured results show an operating bandwidth of 3.32 to 3.925GHz (S11 < 6dB) with a transmission coefficient < -14.7dB. A high total efficiency for an antenna array is also obtained at 70-85.6%. The design is suitable for MIMO communications exhibited by an Envelope Correlation Coefficient (ECC) < 0.014. To conclude a
Specific Absorption Rate (SAR) model has been constructed and presented showing the user?s effects on the antenna?s Sparameter results. Measurements of the amount of power
absorbed by the head and hand during operation have also been simulated.
This paper presents empirically based ultrawideband
and directional channel measurements, performed in
the Terahertz (THz) frequency range over 250 GHz bandwidth
from 500 GHz to 750 GHz. Measurement setup calibration
technique is presented for free-space measurements taken at
Line-of-Sight (LoS) between the transmitter (Tx) and receiver(Rx) in an indoor environment. The atmospheric effects on signal propagation in terms of molecular absorption by oxygen and
water molecules are calculated and normalized. Channel impulse responses (CIRs) are acquired for the LoS scenario for different antenna separation distances. From the CIRs the Power Delay Profile (PDP) is presented where multiple delay taps can be observed caused due to group delay products and reflections from the measurement bench.