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公开(公告)号：US20250038419A1
公开(公告)日：2025-01-30
申请号：US18911968
申请日：2024-10-10
Inventor： Rifaqat HUSSAIN
Abstract: A frequency reconfigurable (FR) slot-based UHF antenna for use in Cube-Sat is described. The antenna includes a dielectric circuit board, a metallic layer, a meandered slot line formed in the metallic layer, a feed horn is connected to a first edge of the circuit board, a reverse biased varactor diode, a ground terminal connected to the metallic layer and a biasing circuit configured to bias the reverse biased varactor diode. The biasing circuit causes the antenna to resonate in a frequency range of 300 MHz to 450 MHz. The meandered slot line includes a heptagonal path connected to and enclosing a rectangular path. An open end of the feed horn is directed towards the apex of the heptagonal path. The reverse biased varactor diode is connected to the metallic layer across the rectangular path and parallel to a central axis.
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公开(公告)号：US20240364018A1
公开(公告)日：2024-10-31
申请号：US18767137
申请日：2024-07-09
Inventor： Rifaqat HUSSAIN
CPC classification number: H01Q21/0075 , H01Q5/321 , H01Q7/005 , H01Q9/0464 , H01Q13/10 , H01Q21/064 , H01Q21/28
Abstract: A reconfigurable, dual-band, MIMO antenna apparatus, a planar MIMO antenna system utilizing the antenna apparatus, and a method of transmitting and receiving a signal by the antenna apparatus are provided. The apparatus includes a dielectric planar substrate, a first element, a second element, two varactor diodes per element, and a microstrip feed-line. The first element and the second element each have slotted concentric annular rings. The second element is separated on the dielectric planar substrate from the first element, but is coplanar on the dielectric planar substrate with the first element. The two varactor diodes are placed in series with biasing circuitry, the biasing circuitry including RF chokes and current-limiting resistors. The microstrip feed-line feeds both antenna elements. The dual-band antenna elements can each be independently and concurrently tunable to two signal frequencies bands.
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公开(公告)号：US20240235041A1
公开(公告)日：2024-07-11
申请号：US18616237
申请日：2024-03-26
Inventor： Rifaqat HUSSAIN
CPC classification number: H01Q13/106 , H01P5/12 , H01Q5/35
Abstract: An antenna system and a method for fabricating an antenna system are disclosed. The antenna system includes a substrate having a top side and a bottom side, a single straight microstrip line on the top side of the substrate, a microstrip power divider (PD) on the top side of the substrate, and a ground plane on the bottom side. An input end of the single straight microstrip line is adjacent and vertical to a first edge of the substrate, and an output end of the single straight microstrip line is open. An input end of the microstrip PD is adjacent and vertical to a second edge of the substrate, and eight output ends of the microstrip PD are open. The first edge is parallel to the second edge. Further, three concentric square slots are etched on the ground plane.
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公开(公告)号：US20240388006A1
公开(公告)日：2024-11-21
申请号：US18317973
申请日：2023-05-16
Inventor： Rifaqat HUSSAIN
Abstract: A three element slot-based antenna which includes a dielectric circuit board, a metallic layer, a sensing antenna, a first narrow band antenna, a second narrow band antenna, a first tapered transmission line, a second tapered transmission line, a first microstrip transmission line and a second microstrip transmission line. The sensing antenna is a semi-hexagonal slot-line loop whereas each of the first narrow band antenna and the second narrow band antenna are formed as a semi-elliptical slot-line loop having an E-shaped base in the metallic layer. The first tapered transmission line and the second tapered transmission line is connected to first feed port and second feed port, respectively. The first microstrip transmission line and the second microstrip transmission line are connected to third feed port and fourth feed port, respectively. The antenna resonates with circular polarization in an ultra-high frequency sub-GHz responsive to input signal at each feed port.
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公开(公告)号：US20240297430A1
公开(公告)日：2024-09-05
申请号：US18177506
申请日：2023-03-02
Inventor： Rifaqat HUSSAIN , Muhammad Nawaz ABBASI , Abdul AZIZ , Naveed IQBAL , Azzedine ZERGUINE
CPC classification number: H01Q1/1271 , H01Q9/0407 , H01Q21/06
Abstract: An antenna is disclosed. The antenna includes a transparent substrate, a first square patch antenna element with a square lattice structure, a second square patch antenna element and a low profile transparent passive decoupling strip. The first square patch antenna element is disposed on the transparent substrate. The first square patch antenna element includes horizontal conductive wires and vertical conductive wires. The horizontal conductive wires and the vertical conductive wires cross each other and are equally spaced to form square spaces between. The second square patch antenna element is disposed on the transparent substrate. The second square patch antenna element has a structure identical to the structure of the first square patch antenna element. The first and the second square patch antenna elements are spaced apart from each other. The low profile transparent passive decoupling strip is disposed between the first and the second square patch antenna elements.
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公开(公告)号：US20240278034A1
公开(公告)日：2024-08-22
申请号：US18452856
申请日：2023-08-21
Inventor： Rifaqat HUSSAIN , Abdul Rehman CHISHTI , Abdul AZIZ , Abdullah AL-GARNI
CPC classification number: A61N5/025 , H01Q9/0414 , H01Q9/26 , H05B6/80
Abstract: A folded dipole patch antenna for use in a hyperthermia applicator is described. The antenna includes a dielectric circuit board, and a folded dipole microstrip antenna. The dielectric circuit board has a top side and a bottom side. The folded dipole microstrip antenna is formed on the top side and includes two meander paths mirror each other. A pair of parallel metallic strips is located on the bottom side. A coaxial feed port is connected to the pair of parallel metallic strips. The antenna is configured to resonate in a frequency range of about 434 MHz upon application of an input signal at the coaxial feed port. The folded dipole patch antenna has a small size and does not require an impedance matching circuit. The hyperthermia applicator is configured to emit microwave energy toward a target tissue within a human body.
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公开(公告)号：US20240275062A1
公开(公告)日：2024-08-15
申请号：US18169570
申请日：2023-02-15
Inventor： Rifaqat HUSSAIN
CPC classification number: H01Q13/103 , H01Q1/288 , H01Q1/48 , H01Q5/307 , H01Q13/106
Abstract: A frequency reconfigurable (FR) slot-based UHF antenna for use in Cube-Sat is described. The antenna includes a dielectric circuit board, a metallic layer, a meandered slot line formed in the metallic layer, a feed horn is connected to a first edge of the circuit board, a reverse biased varactor diode, a ground terminal connected to the metallic layer and a biasing circuit configured to bias the reverse biased varactor diode. The biasing circuit causes the antenna to resonate in a frequency range of 300 MHz to 450 MHz. The meandered slot line includes a heptagonal path connected to and enclosing a rectangular path. An open end of the feed horn is directed towards the apex of the heptagonal path. The reverse biased varactor diode is connected to the metallic layer across the rectangular path and parallel to a central axis.
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公开(公告)号：US20240235043A1
公开(公告)日：2024-07-11
申请号：US18616260
申请日：2024-03-26
Inventor： Rifaqat HUSSAIN
CPC classification number: H01Q13/106 , H01P5/12 , H01Q5/35
Abstract: An antenna system and a method for fabricating an antenna system are disclosed. The antenna system includes a substrate having a top side and a bottom side, a single straight microstrip line on the top side of the substrate, a microstrip power divider (PD) on the top side of the substrate, and a ground plane on the bottom side. An input end of the single straight microstrip line is adjacent and vertical to a first edge of the substrate, and an output end of the single straight microstrip line is open. An input end of the microstrip PD is adjacent and vertical to a second edge of the substrate, and eight output ends of the microstrip PD are open. The first edge is parallel to the second edge. Further, three concentric square slots are etched on the ground plane.
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公开(公告)号：US20250038416A1
公开(公告)日：2025-01-30
申请号：US18915413
申请日：2024-10-15
Inventor： Rifaqat HUSSAIN , Abdul Rehman CHISHTI , Abdul AZIZ , Abdullah AL-GARNI , Sharif Iqbal Mitu SHEIKH
Abstract: A shared aperture multi-band antenna is described. The antenna includes a dielectric circuit board, a folded dipole microstrip antenna, and a lumped inductor. The folded dipole microstrip antenna is formed on a top side of the dielectric circuit board. The microstrip antenna includes two meander paths. The two meander paths enclose a shared aperture therebetween. The lumped inductor is inserted across a first gap near the third edge. A first pair of parallel metallic patches, a second pair of parallel metallic patches, and a third pair of parallel metallic patches are located on the bottom side. The antenna resonates in a dual band frequency range comprising a first resonance band in a range of 0.4 GHz to 0.6 GHz and a second resonance band in a range of 4.7 GHz to 5.8 GHz upon application of an input signal at both a first feed port and a second feed port.
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公开(公告)号：US20240413529A1
公开(公告)日：2024-12-12
申请号：US18330400
申请日：2023-06-07
Inventor： Rifaqat HUSSAIN , Umar FAYYAZ , Shahab Ahmad NIAZI , Abdul AZIZ , Abdullah AL-GARNI
Abstract: A fourth order orbital angular momentum (OAM) four patch antenna is described. The antenna includes a dielectric substrate, a metallic sheet, and a four patch antenna. The four patch antenna includes a circular ring path patch, a first feed branch patch, and a second feed branch patch. The first feed branch patch is connected to the circular ring path patch. The second feed branch patch includes a straight leg which extends radially from the circular ring path patch and a curved leg having a first end connected to the straight leg and a second leg connected to the first end of feed port patch. The antenna is configured to resonate in a fourth order OAM mode at a frequency of 5.12 GHz when an electrical input signal is applied to a second end of the feed port patch.
