Fig 1.
Design topology of single radiator.
(A) front view (B) back view.
Fig 2.
Step wise geometry of the designed structure.
(A) front view for step1 and step2 (B) back view step1 (C)) back view step2 and step3 (D)) front view step3.
Fig 3.
Reflection coefficient for step wise antenna topologies.
Fig 4.
(A) step1 front view (B) step1 back view (C) step2 front view (D) step2 and step3 back view (E) step 3 front view.
Fig 5.
(A) real impedance (B) imaginary impedance.
Fig 6.
Reflection coefficient plot for patch slot length ‘Lc’.
Fig 7.
(A) Front View (B) Back view (C) Surface current.
Fig 8.
S-parameters plot for 2-element MIMO structure.
Fig 9.
(A) Front view(B) Back view without decoupling structure (C) Back view with coupling structure.
Fig 10.
S-parameter plot of 4-port MIMO antenna without decoupling structure.
Fig 11.
Surface current distribution of 4-element structure.
(A) without decoupling structure (B) with decoupling structure.
Table 1.
List of geometrical parameters.
Fig 12.
Reflection coefficient for decoupled 4-element MIMO antenna.
Fig 13.
Transmission coefficient for decoupled 4-element MIMO antenna.
Fig 14.
(A) Front view (B) Back view.
Fig 15.
Reflection coefficient for 8-elemnet antenna.
Fig 16.
Transmission coefficient for 8-element antenna.
Fig 17.
(A) rectangular phantom (B) circular phantom and (C) voxel arm model.
Fig 18.
S-parameter curves of antenna with body tissue phantoms.
Fig 19.
(A) on-body simulation setup for 8-port antenna (B) on-body measurement setup (C) antenna in chamber for radiation pattern measurement.
Fig 20.
(A) Reflection coefficient (B) Transmission Coefficient.
Fig 21.
(A) Reflection coefficient (B) Transmission Coefficient.
Fig 22.
Radiation characteristics at 27 GHz.
(A) free space port1 (B) free space port3 (C) free space port6 (D)on-tissue port1 (E) on-tissue port 3 (F) on-tissue port 6.
Fig 23.
(A) free space for port-2 (B) free space for port-8 (C) on-body port-2 (D) on-body port 8.
Fig 24.
(A) free space for port-2 (B) free space for port-8 (C) on-body port-2 (D) on-body port 8.
Fig 25.
(A) free space ECC (B) free space diversity gain (C) on-body ECC (D) on-body diversity gain.
Fig 26.
(A) on rectangular phantom (B) on voxel arm (C) on circular phantom in bent state (D) SAR for 8-port structures for radiator 2 and radiator 8.
Table 2.
Comparison of antenna performance with existing literature.