CN-122000680-A - Circularly polarized antenna and communication system

Abstract

A circularly polarized antenna comprises an antenna part and a feed part which are vertically stacked, wherein the antenna part is arranged on a first substrate, the antenna part comprises a first antenna unit, a parasitic element, a second antenna unit, a feed part and a branch line coupler, the first antenna unit comprises a cross-shaped metal patch and is arranged on the top layer of the first substrate, the parasitic element is formed by four metal strips and is in a square shape with four unconnected sides and is arranged on the middle layer of the first substrate, the second antenna unit comprises a square metal patch and is arranged on the bottom layer of the first substrate, the feed part is arranged on a second substrate and comprises a coupling slot hole and is arranged on the top layer of the second substrate, a matching microstrip line is arranged on the middle layer of the second substrate, the feed line is arranged on the bottom layer of the second substrate, the branch line coupler is arranged on the bottom layer of the second substrate, the matching microstrip line is electrically connected between the feed line and the branch line coupler through a layer exchange technology, the thickness of the substrate is thickened, the achievable impedance matching range is increased, the gain bandwidth, the axial ratio bandwidth and the echo loss bandwidth are increased, and the antenna performance is optimized.

Inventors

• CHEN YIMING
• LIN SHENGMIN
• CHEN SIDI

Assignees

• 南宁富联富桂精密工业有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (10)

1. 1. A circularly polarized antenna comprising an antenna portion and a feeding portion stacked up and down, characterized in that: the antenna portion is disposed on a first substrate, the first substrate includes a top layer, a middle layer, and a bottom layer, and the antenna portion includes: the first antenna unit comprises a cross-shaped metal patch, and a top layer of the first substrate is arranged on the metal patch; The parasitic element is formed by four metal strips, has a square shape with four unconnected sides and is arranged in the middle layer of the first substrate; the second antenna unit comprises a square metal patch and is arranged at the bottom layer of the first substrate; the feed portion sets up on the second base plate, the second base plate includes top layer, intermediate level and bottom, the feed portion includes: the coupling slot hole is arranged on the top layer of the second substrate; The matching microstrip line is arranged in the middle layer of the second substrate; the feed-in line is arranged at the bottom layer of the second substrate; The branch line coupler is arranged at the bottom layer of the second substrate, and the matching microstrip line is electrically connected between the feed-in line and the branch line coupler through a via hole.
2. 2. The circularly polarized antenna of claim 1 wherein the first substrate is soldered to the second substrate.
3. 3. The circularly polarized antenna of claim 1 wherein the cut angle of the cross-shaped metal patch of the first antenna element is sized to adjust the high frequency bandwidth of the operating frequency band.
4. 4. The circularly polarized antenna of claim 1 wherein the width of the four metal strips of the parasitic element is adjusted to adjust the low frequency bandwidth of the operating band.
5. 5. The circularly polarized antenna of claim 1, wherein: the coupling slots are used for coupling signals received by the antenna parts and coupling signals transmitted by the feed parts; The coupling slot comprises a first slot and a second slot, and the first slot and the second slot are combined to form a splayed shape.
6. 6. The circularly polarized antenna of claim 1, wherein the branch line coupler comprises: The first microstrip line is in a closed ring shape; the receiving end is connected to one side of the first microstrip line; The transmitting end is connected to one side of the first microstrip line; The first feed-in end is connected to the other side of the first microstrip line; the second feed-in end is connected to the other side of the first microstrip line.
7. 7. The circularly polarized antenna of claim 6, wherein: The feed-in line comprises a first feed-in line and a second feed-in line, and the first feed-in line and the second feed-in line are combined to form a splayed shape; the matching microstrip line comprises a first matching microstrip line and a second matching microstrip line, and the first matching microstrip line and the second matching microstrip line are combined to form a splayed shape; The first matching microstrip line is electrically connected between the first feed-in line and the first feed-in end of the branch line coupler through a first via hole and a second via hole; The second matching microstrip line is electrically connected between the second feed-in line and the second feed-in end of the branch line coupler through a third via hole and a fourth via hole.
8. 8. The circularly polarized antenna of claim 7, wherein: exciting a horizontal polarization direction field pattern through the first feed-in line; And exciting a vertical polarization direction field pattern through the second feed-in line.
9. 9. The circularly polarized antenna of claim 7, wherein: When a signal enters the branch line coupler from the transmitting end, exciting a left-hand circular polarization pattern; when a signal enters the branch line coupler from the receiving end, a right-hand circular polarization mode is excited.
10. 10. A communication system comprising a circularly polarised antenna according to any of claims 1-9.

Description

Circularly polarized antenna and communication system Technical Field The present invention relates to the field of virtual reality technologies, and in particular, to a code scanning method for virtual reality glasses, a virtual reality glasses, and a storage medium. Background In recent years, the technology of phased array antennas has been changed from military use to civilian use, such as low-orbit satellite communication systems and radar systems, so that the traditional phased array antenna technology has been changed from planar T/R modules to highly integrated vertical integrated T/R modules, so as to facilitate the reduction of the size, area and weight of electronic devices, and therefore, how to design the structure and impedance matching between integrated tile-type unit antennas and T/R modules will be the focus of development. The antenna polarization is also changed from linear polarization to circular polarization, mainly because the advantages of the circular polarization antenna are not as strict as the requirements of the linear polarization on the alignment of the polarization direction of the electric wave, and the circular polarization antenna can transmit and receive signals under different angles and environments, so that the antenna can effectively reduce the distortion of multiple paths, is very suitable for being used by a low-orbit satellite phased array antenna, a radar phased array antenna, a 5G base station phased array antenna and the like, and the application of wireless communication broadband transmission is increasingly increased in recent years, so that the circular polarization antenna is miniaturized, broadband, high-gain, broadband axial ratio and the like, and is a new challenge for the development of the circular polarization antenna technology. Disclosure of Invention In view of the above, the present invention provides a circularly polarized antenna, which meets the requirements of wideband, high gain and wideband axial ratio of the circularly polarized antenna. The invention provides a circularly polarized antenna, which comprises an antenna part and a feed part, wherein the antenna part is arranged on a first substrate, the first substrate comprises a top layer, a middle layer and a bottom layer, the antenna part comprises a first antenna unit, a parasitic element, a second antenna unit, a feed part and a branch line coupler, the first antenna unit comprises a cross-shaped metal patch, the parasitic element comprises four metal strips which form a square shape with four unconnected sides and is arranged on the middle layer of the first substrate, the second antenna unit comprises a square metal patch and is arranged on the bottom layer of the first substrate, the feed part is arranged on a second substrate, the second substrate comprises a top layer, a middle layer and a bottom layer, the feed part comprises a coupling slot hole and a matching microstrip line which is arranged on the top layer of the second substrate, the middle layer of the second substrate, the feed line is arranged on the bottom layer of the second substrate, the branch line coupler is arranged on the bottom layer of the second substrate, and the matching microstrip line is electrically connected between the feed line and the branch line coupler through a via hole. Preferably, the first substrate is soldered to the second substrate. Preferably, adjusting the cut angle of the cross-shaped metal patch of the first antenna unit adjusts the high-frequency bandwidth of the operating frequency band. Preferably, the width of the four metal strips of the parasitic element is adjusted to adjust the low-frequency bandwidth of the operating frequency band. Preferably, the coupling slot is used for coupling signals received by the antenna part and coupling signals transmitted by the feed part, and comprises a first slot and a second slot, wherein the first slot and the second slot are combined to form a splayed shape. Preferably, the branch line coupler comprises a first microstrip line, a receiving end, a transmitting end, a first feed-in end and a second feed-in end, wherein the first microstrip line is in a closed ring shape, the receiving end is connected to one side of the first microstrip line, the transmitting end is connected to one side of the first microstrip line, the first feed-in end is connected to the other side of the first microstrip line, and the second feed-in end is connected to the other side of the first microstrip line. Preferably, the feed-in line comprises a first feed-in line and a second feed-in line, the first feed-in line and the second feed-in line are combined to form a splayed shape, the matching microstrip line comprises a first matching microstrip line and a second matching microstrip line, the first matching microstrip line and the second matching microstrip line are combined to form a splayed shape, the first matching microstrip line is electrically connected between