US 12,148,995 B1
Dual band MIMO antenna
Rifaqat Hussain, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jul. 9, 2024, as Appl. No. 18/767,212.
Application 18/767,212 is a continuation of application No. 17/675,239, filed on Feb. 18, 2022, granted, now 12,068,540.
This patent is subject to a terminal disclaimer.
Int. Cl. H01Q 21/00 (2006.01); H01Q 5/321 (2015.01); H01Q 7/00 (2006.01); H01Q 9/04 (2006.01); H01Q 13/10 (2006.01); H01Q 21/06 (2006.01); H01Q 21/28 (2006.01)
CPC H01Q 21/0075 (2013.01) [H01Q 5/321 (2015.01); H01Q 7/005 (2013.01); H01Q 9/0464 (2013.01); H01Q 13/10 (2013.01); H01Q 21/064 (2013.01); H01Q 21/28 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A reconfigurable dual-band MIMO antenna apparatus comprising:
a dielectric planar substrate;
a first element comprising a first inner slotted ring having a first radius of 8 mm-9.75 mm connected in series to a first varactor diode and a first outer slotted ring having a second radius of 10.5 mm-12 mm connected in series to a second varactor diode, wherein the first inner slotted ring and the first outer slotted ring are concentric;
a second element comprising a second inner slotted ring having the first radius connected in series to a third varactor diode and a second outer slotted ring having the second radius connected in series to a fourth varactor diode, wherein the second inner slotted ring and the second outer slotted ring are concentric, wherein the second element is separated on the dielectric planar substrate from the first element but coplanar on the dielectric planar substrate with the first element;
and
a microstrip feed-line feeding the first element and the second element;
wherein the first element and the second element are independently and concurrently tunable to two signal frequencies bands; and
wherein the first varactor diode, the second varactor diode, the third varactor diode, and the fourth varactor diode each have a biasing circuitry comprising RF chokes and current limiting resistors.