Dual circularly polarized antenna device

Abstract

The invention discloses a dual circularly polarized antenna device. The dual circularly polarized antenna device comprises a multilayer board, four antennas, four coupling microstrip lines and a coupling module. The four antennas are arranged on the multilayer board. The four coupling microstrip lines are respectively corresponding to the four antennas in position. Each coupling microstrip line comprises a middle shaft part, two C-shaped parts and at least two fishbone parts. The two C-shaped parts are arranged on the two sides of the middle shaft part. Each C-shaped part is provided with an opening, and the opening of each C-shaped part faces the direction away from the middle shaft part. The at least two fishbone parts are connected with the middle shaft part and the two C-shaped parts. Each fishbone part comprises a main shaft section and at least one extension section connected with the main shaft section; the main shaft section is perpendicular to the at least one extension section. The coupling module is electrically coupled with a receiving contact and a transmission contact of each antenna through four coupling microstrip lines.

Description

Technical Field

[0001] The present invention relates to an antenna device, and in particular to a dual circular polarization antenna device. Background Art

[0002] The existing dual circularly polarized antenna device uses a power divider to feed a 90-degree phase difference to achieve circular polarization. However, the phase and amplitude generated by the existing dual circularly polarized antenna device differ too much, resulting in the existing dual circularly polarized antenna being unable to maintain a good axial ratio (AR) within a broadband range.

[0003] In addition, the power divider feed can only produce circular polarization in a single direction (for example, right-hand circular polarization or left-hand circular polarization). Therefore, the existing dual circular polarization antenna device needs to use two sets of antennas and feeding systems to achieve dual circular polarization, but this makes the existing dual circular polarization antenna device bulky.

[0004] Therefore, the inventors believe that the above defects can be improved, and have devoted themselves to research and applied scientific principles, and finally proposed the present invention which has a reasonable design and effectively improves the above defects. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a dual circular polarization antenna device in view of the deficiencies in the prior art.

[0006] The embodiment of the present invention discloses a dual circular polarization antenna device, comprising: a multilayer board; four antennas, which are arranged on the multilayer board, each of the antennas has a receiving contact and a transmission contact; four coupling microstrip lines, which are respectively located corresponding to the four antennas, and each of the coupling microstrip lines includes: an intermediate shaft portion; two C-shaped portions, which are arranged on both sides of the intermediate shaft portion, each of the C-shaped portions has an opening, and the opening of each of the C-shaped portions faces a direction away from the intermediate shaft portion; and at least two fishbone portions, which connect the intermediate shaft portion and the two C-shaped portions, each of the fishbone portions includes a main shaft section, and at least one extension section connected to the main shaft section, and the main shaft section and the at least one extension section are perpendicular to each other; and a coupling module, which is arranged on the multilayer board, and the coupling module electrically couples the receiving contact and the transmission contact of each of the antennas through the four coupling microstrip lines.

[0007] In summary, the dual circular polarization antenna device disclosed in the embodiments of the present invention can generate dual circular polarization and have a smaller volume through the designs of "each of the coupling microstrip lines includes an intermediate axis portion, two C-shaped portions, and at least two fishbone portions connecting the intermediate axis portion and the two C-shaped portions" and "the coupling module electrically couples the receiving contact and the transmission contact of each of the antennas through four coupling microstrip lines".

[0008] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional schematic diagram of the dual circular polarization antenna device of the present invention.

[0010] Figure 2 It is a top view schematic diagram of the dual circular polarization antenna device of the present invention.

[0011] Figure 3 It is a plan view of the coupled microstrip line of the dual circular polarization antenna device of the present invention on a carrier.

[0012] Figure 4 It is a plan view of the coupled microstrip lines of the dual circularly polarized antenna device of the present invention.

[0013] Figure 5 It is a plan view schematically showing another aspect of the coupled microstrip lines of the dual circularly polarized antenna device of the present invention.

[0014] Figure 6 FIG. 4 is a plan view of a coupled microstrip line of the dual circularly polarized antenna device of the present invention in another embodiment.

[0015] Figure 7 It is a plan view of the coupling module of the dual circular polarization antenna device of the present invention on a carrier.

[0016] Figure 8 It is a cross-sectional schematic diagram of the dual circularly polarized antenna device of the present invention.

[0017] Fig. 9 FIG. 4 is a plan view of another embodiment of the dual circularly polarized antenna device of the present invention.

[0018] The reference numerals of the above drawings are:

[0019] 100, 100': Dual circular polarization antenna device

[0020] 1: Multilayer board

[0021] S1: First outer structure

[0022] S2: Second outer structure

[0023] S3: Welded structure

[0024] 2: Antenna

[0025] 3, 3', 3": coupled microstrip lines

[0026] 31: Intermediate shaft

[0027] 311: Intermediate connection block

[0028] 312: Middle long section

[0029] 32: C-section

[0030] 321: Outer connection block

[0031] 322: First outer long segment

[0032] 323: Second outer long segment

[0033] 33: Fishbone

[0034] 331: Spindle section

[0035] 332: Extension

[0036] 4: Coupling module

[0037] W322, W323, W312, W32, W321, W311, W331, W332: Width

[0038] L31, L321, L311: Length

[0039] RP: receiving point

[0040] TP: Transmission point

[0041] X: Reference point

[0042] D1: First direction

[0043] D2: Second direction DETAILED DESCRIPTION

[0044] The following is an explanation of the implementation of the "dual circular polarization antenna device" disclosed in the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted in actual size. It is stated in advance. The following implementations will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0045] It should be understood that, although the terms "first", "second", "third", etc. may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used in this document may include any one or more combinations of the associated listed items depending on the actual situation.

[0046] In addition, in the following description, if it is indicated to refer to a specific figure or as shown in a specific figure, it is only used to emphasize that most of the related content described in the subsequent description appears in the specific figure, but it does not limit the subsequent description to only refer to the specific figure.

[0047] See also Figures 1 to 8 As shown, this embodiment provides a dual circular polarization antenna device 100. Figure 1 and Figure 7 As shown, the dual circular polarization antenna device 100 comprises a multilayer board 1, four antennas 2 disposed on the multilayer board 1, four coupling microstrip lines 3 respectively electrically coupled to the four antennas 2, and a coupling module 4 respectively electrically coupled to the four coupling microstrip lines 3. Next, the components of the dual circular polarization antenna device 100 and their connection relationships are introduced below.

[0048] like Figure 1 As shown, the multilayer board 1 is a multilayer structure made of insulating material, and four antennas 2 are arranged on an outer layer (not shown) of the multilayer board 1. In this embodiment, the four antennas 2 are roughly circular and have a center (not shown), and each antenna 2 has a receiving contact RP and a transmission contact TP around the center, but the antenna 2 of the present invention is not limited to this shape. For example, in other embodiments of the present invention that are not shown, each antenna 2 can also be hexagonal.

[0049] In practice, the four antennas 2 are arranged on the multilayer board 1 in a matrix manner (e.g., 2 by 2). That is, the multilayer board 1 has a reference point X, and the four coupled microstrip lines 3 are arranged with the reference point X as the center. Preferably, the four antennas 2 are arranged with the reference point X as the center and are 90 degrees rotationally symmetrical.

[0050] Re-reference Figure 3 and Figure 4As shown, the four coupling microstrip lines 3 are respectively arranged on a middle layer (not marked) of the multilayer board 1, and the positions of the four coupling microstrip lines 3 correspond to the four antennas 2. In other words, the four coupling microstrip lines 3 can also be arranged 90 degrees rotationally symmetrically with the reference point X as the center. In addition, the four coupling microstrip lines 3 are respectively electrically coupled to the four antennas 2 through a plurality of conductive posts (not marked) (in the multilayer board 1).

[0051] Cooperate Figure 3 and Figure 4 As shown, each of the coupled microstrip lines 3 is symmetrical and includes a middle axis portion 31, two C-shaped portions 32 disposed on both sides of the middle axis portion 31, and at least two fishbone portions 33 connecting the middle axis portion 31 and the two C-shaped portions 32. In order to facilitate the subsequent description, each of the coupled microstrip lines 3 is roughly regarded as a rectangle and defines a first direction D1 and a second direction D2 perpendicular to the first direction D1, wherein the first direction D1 is parallel to the long side of the coupled microstrip line 3, and the second direction D2 is parallel to the short side of the coupled microstrip line 3.

[0052] The intermediate shaft portion 31 is substantially I-shaped in this embodiment, and includes two rectangular intermediate connecting blocks 311 and an intermediate long section 312 connecting the two intermediate connecting blocks 311 .

[0053] The two C-shaped portions 32 are disposed on both sides of the middle shaft portion 31, and the two C-shaped portions 32 can be symmetrically arranged with the middle elongated section 312 (the center line) as the symmetry axis. Each C-shaped portion 32 has an opening (not shown), and the opening of each C-shaped portion 32 faces away from the middle shaft portion 31.

[0054] In this embodiment, each of the C-shaped portions 32 includes two outer connecting blocks 321, a first outer elongated section 322, and two second outer elongated sections 323. The two outer connecting blocks 321 are rectangular, and the two outer connecting blocks 321 are arranged at intervals from each other. The first outer elongated section 322 is disposed between the two outer connecting blocks 321, and the first outer elongated section 322 connects the two outer connecting blocks 321. The two second outer elongated sections 323 extend from the two outer connecting blocks 321 in a direction away from the intermediate shaft portion 31, and each of the second outer elongated sections 323 is not parallel to the first outer elongated section 322 (for example, perpendicular).

[0055] The width W322 of the first outer elongated segment 322 along the first direction D1 may be smaller than the width W323 of the second outer elongated segment 323 along the second direction D2, and the width W322 of the first outer elongated segment 322 along the first direction D1 may be smaller than the width W312 of the middle elongated segment 312 along the first direction D1.

[0056] It should be noted that, in practice, the width W32 of each C-shaped portion 32 along the second direction D2 may be approximately equal to the length L31 of the intermediate shaft portion 31 along the second direction D2, that is, the total length of the two outer connecting blocks 321 and the first outer elongated section 322 along the second direction D2 is approximately equal to the total length of the two middle connecting blocks 311 and the middle elongated section 312 along the second direction D2, but the present invention is not limited to this.

[0057] In addition, the length L321 of each outer connecting block 321 along the second direction D2 may be equal to the width W311 of the middle connecting block 311 along the second direction D2, and the width W321 of each outer connecting block 321 along the first direction D1 may be smaller than the length L311 of the middle connecting block 311 along the first direction D1. In other words, the area of ​​each outer connecting block 321 is not greater than the area of ​​the middle connecting block 311.

[0058] Re-reference Figure 3 and Figure 4 As shown, the at least two fishbone portions 33 connect the intermediate shaft portion 31 and the two C-shaped portions 32. The at least two fishbone portions 33 connect the intermediate shaft portion 31 and the two C-shaped portions 32 with the center line of the coupled microstrip line 3 as the symmetry axis, so that the coupled microstrip line 3 is symmetrical. In this embodiment, each coupled microstrip line 3 is illustrated with four fishbone portions 33, but the present invention is not limited thereto.

[0059] Each of the fishbone portions 33 includes a main axis section 331 and at least one extension section 332 connected to the main axis section 331. The main axis section 331 and the plurality of extension sections 332 are perpendicular to each other. Preferably, the at least one extension section 332 may be parallel to the first outer elongated section 322 and the middle elongated section 312, and the main axis section 331 is perpendicular to the first outer elongated section 322 and the middle elongated section 312. In other words, the shape of each of the coupled microstrip lines 3 is roughly ladder-shaped.

[0060] It should be noted that, in practice, the dual circular polarization antenna device 100 is suitable for a transmission frequency band, and the length of the at least one extension section 332 of each fishbone section 33 along the second direction D2 is not less than 1 / 4 of the wavelength corresponding to a center frequency of the transmission frequency band. In addition, the width W331 of the main axis section 331 of each fishbone section 33 along the second direction D2 and the width W332 of the at least one extension section 332 along the first direction D1 are smaller than the width W31 of the intermediate axis section 31 along the first direction D1, and the width W331 of the main axis section 331 of each fishbone section 33 along the second direction D2 and the width W332 of the at least one extension section 332 along the first direction D1 are inversely proportional to the number of the at least one extension section 332.

[0061] More specifically, the number of the at least one extension section 332 of each of the herringbone portions 33 can be adjusted. For example, each of the herringbone portions 33 has one extension section 332 (eg, Figure 4 As shown), the two extension sections 332 (as shown Figure 5 as shown), or three of the extension segments 332 (as shown Figure 6 As shown in Figure 2. Figure 4 As shown, when each of the fishbone portions 33 has one extension section 332, the width W331 of the main shaft section 331 along the second direction D2 may be 0.4 mm, and the width W332 of the extension section 332 along the first direction D1 may be 0.5 mm. Figure 5 As shown, when each of the fishbone portions 33 has two extension segments 332, the width W331 of the main shaft segment 331 along the second direction D2 may be 0.25 mm, and the width W332 of the extension segment 332 along the first direction D1 may be 0.25 mm. Figure 6 As shown, when each of the fishbone portions 33 has three extension segments 332 , the width W331 of the main axis segment 331 along the second direction D2 may be 0.25 mm, and the width W332 of the extension segment 332 along the first direction D1 may be 0.15 mm.

[0062] Accordingly, when the impedance of the dual circularly polarized antenna device 100 remains unchanged, the overall volume of the dual circularly polarized antenna device 100 can be reduced by increasing the number of the extending sections 332 .

[0063] More specifically, the area enclosed by "the two outer connecting blocks 321 of the four fishbone parts 33 and the first outer elongated section 322, and the two middle connecting blocks 311 of the middle shaft part 31" of each of the coupled microstrip lines 3 is used as a reference size. The dual circularly polarized antenna device 100 is based on the fishbone part 33 not having the extension section 332 as a basic ratio of 100%. The reference sizes of the dual circularly polarized antenna device 100 with different numbers of the extension sections 332 are shown in Table 1 below.

[0064] Table 1

[0065] Number of extensions Reference size Proportion 0 7.84mm*8.85mm 100％ 1 7mm*5.55mm 55％ 2 7mm*5.15mm 51％ 3 7mm*4.15mm 41％

[0066] Re-reference Figure 3 , Figure 7 and Figure 8 As shown, the coupling module 4 is disposed on the multilayer board 1, and the coupling module 4 electrically couples (e.g., vias) the receiving contact RP and the transmission contact TP of each antenna 2 through four coupling microstrip lines 3. In this embodiment, the coupling module 4 electrically couples the receiving contact RP and the transmission contact TP by connecting to one of the C-shaped portions 32.

[0067] In addition, it is worth noting that the antenna thickness of the dual circular polarization antenna device 100 is proportional to the bandwidth. When the dual circular polarization antenna device is an array structure, the substrate carrying the antenna will bend. Therefore, the multilayer board 1 of the dual circular polarization antenna device 100 of the present invention adopts the method of "connecting the antenna board and the main board by welding" to solve the warping problem.

[0068] Specifically, the multilayer board 1 includes a first outer layer structure S1, a second outer layer structure S2, and a welding structure S3. The first outer layer structure S1 is used as an antenna board and includes four antennas 2. The second outer layer structure S2 is used as a main board and includes the coupling module 4 and four coupling microstrip lines 3. The first outer layer structure S1 and the second outer layer structure S2 are connected by the welding structure S3.

[0069] It should be noted that the dual circularly polarized antenna device 100 in this embodiment is described as a group of antenna units consisting of "four antennas 2, four coupling microstrip lines 3, and one coupling module 4". Fig. 9 As shown, the dual circular polarization antenna device 100 ′ may have multiple groups of antenna units disposed on the multilayer board 1 .

[0070] [Technical Effects of Embodiments of the Invention]

[0071] In summary, the dual circular polarization antenna device disclosed in the embodiments of the present invention can generate dual circular polarization and have a smaller volume through the designs of "each of the coupling microstrip lines includes an intermediate axis portion, two C-shaped portions, and at least two fishbone portions connecting the intermediate axis portion and the two C-shaped portions" and "the coupling module electrically couples the receiving contact and the transmission contact of each of the antennas through four coupling microstrip lines".

[0072] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the scope of the present invention.

Claims

1. A dual circular polarization antenna device, characterized in that: include: A multi-layer board; Four antennas are disposed on the multilayer board, each of the antennas having a receiving contact and a transmitting contact; Four coupled microstrip lines, respectively corresponding to the four antennas, each coupled microstrip line is symmetrical and includes: a middle axis portion; Two C-shaped portions are disposed on both sides of the middle shaft portion, each of the C-shaped portions has an opening, and the opening of each of the C-shaped portions faces a direction away from the middle shaft portion; and At least two fishbone parts connecting the intermediate shaft part and the two C-shaped parts, each of the fishbone parts comprising a main shaft section and at least one extension section connected to the main shaft section, the main shaft section and the plurality of extension sections being perpendicular to each other; as well as A coupling module is disposed on the multilayer board. The coupling module electrically couples the receiving contact and the transmitting contact of each antenna through four coupling microstrip lines.

2. The dual circular polarization antenna device according to claim 1, characterized in that: The multilayer board has a reference point, the four antennas are arranged with 90-degree rotational symmetry around the reference point, and the four coupled microstrip lines are arranged with 90-degree rotational symmetry around the reference point.

3. The dual circular polarization antenna device according to claim 1, characterized in that: Each of the coupled microstrip lines has a first direction and a second direction perpendicular to the first direction, and the width of each of the main axis sections along the second direction and the width of the at least one extension section along the first direction are smaller than the width of the intermediate axis portion along the first direction.

4. The dual circular polarization antenna device according to claim 1, characterized in that: Each of the coupled microstrip lines has a first direction and a second direction perpendicular to the first direction, and the width of each of the main axis segments along the second direction and the width of the at least one extension segment along the first direction are inversely proportional to the number of the at least one extension segment; the dual circularly polarized antenna device is suitable for a transmission frequency band, and the length of the at least one extension segment along the second direction is not less than one quarter of the wavelength corresponding to a center frequency of the transmission frequency band.

5. The dual circular polarization antenna device according to claim 1, characterized in that: Each of the C-shaped parts includes: two outer connecting blocks; a first outer elongated section connecting the two outer connecting blocks; and Two second outer elongated sections extend respectively from the two outer connecting blocks in a direction away from the middle shaft portion, and each of the second outer elongated sections is not parallel to the first outer elongated section.

6. The dual circular polarization antenna device according to claim 5, characterized in that: Each of the coupled microstrip lines has a first direction and a second direction perpendicular to the first direction, and a width of the first outer elongated segment along the first direction is smaller than a width of the second outer elongated segment along the second direction.

7. The dual circular polarization antenna device according to claim 5, characterized in that: Each of the coupled microstrip lines has a first direction and a second direction perpendicular to the first direction. The intermediate axis portion includes two intermediate connecting blocks and an intermediate elongated section connecting the two intermediate connecting blocks. The width of each of the intermediate connecting blocks along the second direction is equal to the width of the outer connecting blocks along the first direction. The width of the intermediate elongated section along the first direction is greater than the width of the first outer elongated section along the first direction.

8. The dual circular polarization antenna device according to claim 7, characterized in that: The first outer elongated section is parallel to the middle elongated section and the at least one extension section, and the first outer elongated section is perpendicular to each of the second outer elongated sections and the main axis section.

9. The dual circular polarization antenna device according to claim 7, wherein: The area of ​​each of the middle connecting blocks is larger than the area of ​​the outer connecting blocks.

10. The dual circular polarization antenna device according to claim 1, characterized in that: The multilayer board comprises: a first outer structure comprising four of the antennas; a second outer layer structure, disposed on one side of the first outer layer structure, the second outer layer structure comprising the coupling module and the four coupling microstrip lines; and A welding structure connects the first outer layer structure and the second outer layer structure.

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