Elementary microstrip antenna and antenna array

Patent metadata

Field	Value
Publication number	US-2023198151-A1
Application number	US-202218081545-A
Country	US
Kind code	A1
Filing date	Dec 14, 2022
Priority date	Dec 16, 2021
Publication date	Jun 22, 2023
Grant date	—

Abstract

An elementary microstrip antenna includes a stack of layers, stacked in a direction z, the stack comprising: a first conductive radiating element of disc shape having a first centre, an axis in the direction z and passing through the first centre being called the central axis; a coupling assembly configured to couple an exciting device and the first radiating element, the coupling assembly comprising: a first slot comprising a centre called the slot centre located on the central axis; a second slot comprising a centre coincident with the slot centre, and substantially perpendicular to the first slot, the first and second slots each comprising circularly arcuate ends on the same circle centred on the slot centre; the slots and the stacked layers being configured so that a transverse footprint of the elementary antenna is disc-shaped.

First claim

1 . An elementary microstrip antenna comprising a stack of layers, stacked in a direction z, said stack comprising:
a first conductive radiating element (P 1 ) of disc shape having a first centre (C 1 ), an axis in the direction z and passing through said first centre being called the central axis (AC); an exciting device (DE) coupled to the first radiating element and configured to excite the first radiating element with two orthogonal linear polarizations (h, v), said exciting device comprising: a first elementary exciting device coupled to the first radiating element and comprising a first conductive line (L 1 ) and a first power-distributing device (DR 1 ) that is configured to excite the first radiating element based on a first input signal; a second elementary exciting device coupled to the first radiating element and comprising a second conductive line (L 2 ) and a second power-distributing device (DR 2 ) that is configured to excite the first radiating element based on a second input signal; a coupling assembly configured to couple the exciting device and the first radiating element, said coupling assembly comprising: a first slot (F 1 ) comprising a centre called the slot centre (CF) located on said central axis; a second slot (F 2 ) comprising a centre coincident with the slot centre, and substantially perpendicular to the first slot, the first and second slots each comprising circularly arcuate ends (E 1 , E 1 ′, E 2 , E 2 ′) on the same circle (CL) centred on said slot centre; said slots and said stacked layers being configured so that a transverse footprint of said elementary antenna is disc-shaped.

2 . The elementary antenna according to claim 1 , wherein the exciting device comprises:
first and second stubs (S 1 , S 2 ) that are coplanar and connected to the first conductive line, and not perpendicular to the first conductive line (L 1 ), an angle between the first stub ( 51 ) and the first conductive line being opposite to an angle between the second stub (S 2 ) and the first conductive line; third and fourth stubs (S 3 , S 4 ) that are coplanar and connected to the second conductive line, and not perpendicular to the second conductive line (L 2 ), an angle between the third stub (S 3 ) and the second conductive line being opposite to an angle between the fourth stub (S 4 ) and the second conductive line.

3 . The elementary antenna according to claim 2 , wherein the first and second stubs are parallel to the first slot and wherein the third and fourth stubs are parallel to the second slot.

4 . The elementary antenna according to claim 3 , wherein an assembly formed by the first and second stubs and a portion of the first conductive line connecting the first stub to the second stub, forms the letter Z, and wherein an assembly formed by the third and fourth stubs and a portion of the second conductive line connecting the third stub to the fourth stub, forms the letter Z.

5 . The elementary antenna according to claim 3 , wherein the first stub faces an edge of the first slot and the third stub faces an edge of the second slot.

6 . The elementary antenna according to claim 2 , wherein said stubs are substantially of the same length.

7 . The elementary antenna according to claim 6 , wherein the length of the stubs is about equal to λ c /4 with λ c a wavelength corresponding to a central frequency of a bandwidth of said elementary antenna.

8 . The elementary antenna according to claim 1 , wherein a middle of said first line is located on said central axis, wherein a middle of said second line is located on said central axis, and wherein the first and second lines are perpendicular to each other.

9 . The elementary antenna according to claim 8 , wherein the first line and the second line are formed on two opposite faces of a first dielectric substrate (P 12 ).

10 . The elementary antenna according to claim 1 , wherein said transverse footprint is set based on a diameter of said circle.

11 . The elementary antenna according to claim 1 , wherein an angle between the first slot and the first conductive line and an angle between the second slot and the second conductive line is equal to about 45°.

12 . The elementary antenna according to claim 1 , wherein the first and second conductive lines are interposed between the first radiating element (P 1 ) and the first and second slots, the first and second slots being formed from a metal plane, forming a ground plane for the first and second conductive lines and for the first radiating element.

13 . The elementary antenna according to claim 1 , comprising a second disc-shaped radiating element (P 2 ) superposed on the first radiating element, and having a second centre (C 2 ) located on said central axis.

14 . An antenna array comprising a plurality of elementary antennas according to claim 1 .

15 . The antenna array claim 14 , wherein the plurality of elementary antennas is arranged in a square or rectangular lattice.

16 . The antenna array according to claim 14 , wherein the plurality of elementary antennas is arranged in a triangular lattice.

Assignees

• Thales Sa

Inventors

• Renard Christian
• Ayissi Manga Aurélien
• Fourmont Jean-François
• HERAULT JOëL

Classifications

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• H01Q9/0414 Primary

  in a stacked or folded configuration · CPC title

• H01Q1/50

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title

• H01Q9/045

  with particular feeding means (for circular polarisation H01Q9/0428) · CPC title

• H01Q9/0464

  Annular ring patch · CPC title