TWI458177B - Circularly polarized antenna having two linked slot rings - Google Patents

Description

Circularly polarized antenna with two-chain annular slot

The present invention relates to a circularly polarized antenna, and more particularly to a circularly polarized antenna having a double-stranded annular slot.

At present, circularly polarized antennas are widely used in the field of mobile communications. Among them, for wide frequency requirements, a slot-ring antenna is more suitable than a microstrip patch antenna, and a ring is suitable. The slot antenna can be regarded as a dual microstrip ring antenna. Although many techniques have been applied to the microstrip patch antenna and the annular slot antenna to generate circular polarization, the annular slot antenna is generally small. The patch antenna has a higher Axial ratio bandwidth.

Slotted antennas have the advantages of small size, light weight, low profile, simple manufacturing, low cost, and easy integration with other circuits. Therefore, they have become one of the main equipments of existing mobile communication devices, and how to provide multiple working frequency bands and maintain them. The high-axis specific bandwidth has become the focus of the improvement of the slot antenna. The inventor has been actively inventing the spirit of thinking about a circularly polarized antenna with double-chained annular slots that can provide multiple working frequency bands. After several research experiments, I completed the invention of the Jiahui people.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a circularly polarized antenna that couples energy to a grounded element via a double-stranded annular slot to create a double-link annular slot in a plurality of operating frequency bands.

According to a feature of the present invention, the present invention provides a circularly polarized antenna with a double-chained annular slot, comprising: an insulating dielectric layer having an upper surface and a lower surface; and a grounding element disposed in the insulation The upper surface of the dielectric layer has a first polygonal annular slot and a second polygonal annular slot, wherein the first polygonal annular slot and the second polygon The annular slots are partially overlapped; and a feed element is disposed on the lower surface of the insulating dielectric layer, wherein the feed element is looped through the first polygonal annular slot and the second polygonal ring The slot couples energy to the ground element such that the circularly polarized antenna of the double-link annular slot provides multiple operating frequency bands.

In an embodiment of the present invention, the circularly polarized antenna of the double-chained annular slot provides a first working frequency band, a second working frequency band, and a third operating frequency band, wherein the first working frequency band, and The third working frequency band can be adjusted by changing the size of the first annular slot, and the second working frequency band is adjusted by changing the size of the second annular slot.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a circularly polarized antenna with a double-chained annular slot according to a preferred embodiment of the present invention. As shown in FIG. 1, the circularly polarized antenna of the double-chained annular slot includes: a grounding element 1, a feeding element 2, and an insulating dielectric layer 9, which is composed of a non-conductive material. It may be a printed circuit board substrate having an upper surface 91 and a lower surface 92; the grounding element 1 and the feeding element 2 are each a thin layer of metal and are respectively disposed on the upper surface 91 of the insulating dielectric layer 9, and On the lower surface 92, the grounding element 1 has a first polygonal annular slot 11 and a second polygonal annular slot 12, which may be, for example, circular, or rectangular, etc., respectively. The element 2 couples energy to the ground element 1 via the first polygonal annular slot 11 and the second polygonal annular slot 12 to provide a circularly polarized antenna with double-link annular slots Working frequency bands.

2A and FIG. 2B, FIG. 2A is a schematic diagram of the upper surface 91 of the insulating dielectric layer 9 of the circularly polarized antenna of the double-chained annular slot according to a preferred embodiment of the present invention, and FIG. 2B is a schematic diagram of the present invention. A schematic view of the lower surface 92 of the dielectric layer 9 of the circularly polarized antenna of the double-chained annular slot of the preferred embodiment. As shown in FIG. 2A, the upper surface 91 is provided with a grounding element 1 having a first polygonal annular slot 11 and a second polygonal annular slot 12, both of which are A rectangular shape, and the first polygonal annular slot 11 and the second polygonal annular slot 12 partially overlap to form two L-shaped blocks 131, 132, and a rectangular block 133. As shown in FIG. 2B, the lower surface 92 is provided with a feed element 2 which is a microstrip line and whose path is from the edge of the rectangular substrate to the parallel corresponding position on the lower surface 92 of the rectangular block 133. , fed in to couple energy to the ground element 1.

Please refer to FIG. 3A and FIG. 3B. FIG. 3A is a frequency response diagram of a reflection coefficient of a circularly polarized antenna of a double-chained annular slot of the present invention, and FIG. 3B is a circle of the double-chained annular slot of the present invention. The frequency response diagram of the axial ratio of the polarized antenna is obtained by actual testing. In this embodiment, the insulating dielectric layer 9 is a FR4 rectangular printed circuit board substrate having a length and a width of 50 mm and a thickness of 1.6 mm; the outer length and width of the first annular slot 11 are 19.5 mm. The width of the second annular slot 12 is 18 mm and the width of the ring is 2.5 mm; the length and width of the rectangular block 133 are both 6 mm; the feeding element 2 is a microstrip line, and the length thereof is It is 33mm and 3mm wide.

As shown in FIG. 3A, if the grounding element 1 has only a first annular slot 11, that is, a conventional annular slot antenna, only one operating frequency band of 5.2 GHz is provided; if the grounding component has a part The overlapping first annular slot 11 and the second annular slot 12, that is, the circularly polarized antenna of the double-chained annular slot of the present invention, can provide three working frequency bands, respectively, for a first work In the frequency band, a second working frequency band, and a third working frequency band, the first center frequency of the first working frequency band is preferably between 2.65 and 3 GHz, and the second center frequency of the second working frequency band is preferably between 3.5 and 4.4. In GHz, the third center frequency of the third operating band is preferably between 5 and 5.3 GHz. Moreover, by adjusting the size of the first annular slot 11, the first working frequency band and the third working frequency band can be adjusted, and by adjusting the size of the second annular slot 12, the second working frequency band can be adjusted. Make adjustments.

As shown in FIG. 3B, the circularly polarized antenna of the double-chained annular slot of the present invention can achieve an axial ratio bandwidth of 4.5 dB from 2.5 to 3.7 GHz, and circular polarization in the range of 2.5 to 3.7 GHz. The reflection loss of the antenna is greater than 10 dB; therefore, the circularly polarized antenna of the double-chained annular slot of the present invention can effectively satisfy the operating frequency range of 2.5 to 3.7 GHz.

4A, FIG. 4B and FIG. 4C, FIG. 4A is a frequency response diagram of a reflection coefficient of a circularly polarized antenna with a double-chained annular slot according to a preferred embodiment of the present invention, and FIG. 4B is a double of the present invention. FIG. 4C is a frequency response diagram of the gain of the circularly polarized antenna of the double-chained annular slot of the present invention, which is a frequency response diagram of the axial ratio of the circularly polarized antenna with the annular slot of the chain. Actual test results. In this embodiment, the insulating dielectric layer 9 is a FR4 rectangular printed circuit board substrate having a length and a width of 50 mm and a thickness of 1.6 mm; the outer length and width of the first annular slot 11 are 19.5 mm. The width of the second annular slot 12 is 18 mm and the width of the ring is 2.5 mm; the length and width of the rectangular block 133 are both 6 mm; the feeding element 2 is a microstrip line, and the length thereof is It is 33mm and 3mm wide.

4A to 4C, the circularly polarized antenna of the double-chained annular slot of the present invention can provide greater than 10 dB of reflection loss, an axial ratio greater than 3 dB, and a gain greater than 2 dBic in the 2.65 to 3.7 GHz frequency band. That is, the circularly polarized antenna of the double-chained annular slot of the present invention can operate in the frequency band of 2.65 to 3.7 GHz.

5A to FIG. 5F, FIG. 5A is a XZ plane radiation pattern of the circularly polarized antenna of the double-chained annular slot of the present invention in the 2.75 GHz band, and FIG. 5B is a double-chained ring of the present invention. The XZ plane radiation pattern of the circularly polarized antenna of the slot in the 3.1 GHz band, and FIG. 5C is the XZ plane radiation pattern of the circularly polarized antenna of the double-chained annular slot of the present invention in the 3.6 GHz band. Figure 5D is a YZ plane radiation pattern of the circularly polarized antenna of the double-chained annular slot of the present invention in the 2.75 GHz band, and Figure 5E is a circular polarization of the double-chained annular slot of the present invention. The YZ plane radiation pattern of the antenna in the 3.1 GHz band, and FIG. 5F is the YZ plane radiation pattern of the circularly polarized antenna of the double-chained annular slot of the present invention in the 3.6 GHz band, which are all actual tests. And got it.

In summary, the circularly polarized antenna of the double-chained annular slot of the present invention is fed by a microstrip line, and the energy is coupled to the grounded component through two partially overlapping annular slots. The working frequency band does not require other matching networks; and the working frequency band provided varies according to the size of the two annular slots and the size of the overlapping blocks, so by adjusting the first annular slot The size, the size of the second annular slot, or the size of the overlapping blocks can be adjusted separately for the multiple operating bands provided.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

1. . . Grounding element

11. . . First polygonal annular slot

12. . . Second polygonal annular slot

131,132. . . L-shaped block

133. . . Rectangular block

2. . . Feeding component

9. . . Insulating dielectric layer

91. . . Upper surface

92. . . lower surface

1 is a schematic view of a circularly polarized antenna of a double-chained annular slot according to a preferred embodiment of the present invention.

2A is a schematic view showing the upper surface of an insulating dielectric layer of a circularly polarized antenna of a double-chained annular slot according to a preferred embodiment of the present invention.

2B is a schematic view showing the lower surface of the insulating dielectric layer of the circularly polarized antenna of the double-chained annular slot according to a preferred embodiment of the present invention.

3A is a frequency response diagram of a reflection coefficient of a circularly polarized antenna of a double-chained annular slot according to a preferred embodiment of the present invention.

3B is a graph showing the frequency response of the axial ratio of the circularly polarized antenna of the double-chained annular slot according to a preferred embodiment of the present invention.

4A is a frequency response diagram of a reflection coefficient of a circularly polarized antenna of a double-chained annular slot according to a preferred embodiment of the present invention.

4B is a graph showing the frequency response of the axial ratio of the circularly polarized antenna of the double-chained annular slot according to a preferred embodiment of the present invention.

4C is a frequency response diagram of the gain of a circularly polarized antenna of a double-link annular slot in accordance with a preferred embodiment of the present invention.

FIG. 5A is a diagram showing the radiation pattern of the XZ plane of the circularly polarized antenna of the double-chained annular slot in the 2.75 GHz band according to a preferred embodiment of the present invention.

FIG. 5B is a diagram showing the radiation pattern of the XZ plane of the circularly polarized antenna of the double-chained annular slot in the 3.1 GHz band according to a preferred embodiment of the present invention.

5C is a diagram showing the XZ plane radiation pattern of a circularly polarized antenna of a double-chained annular slot in the 3.6 GHz band according to a preferred embodiment of the present invention.

FIG. 5D is a diagram showing the radiation pattern of the YZ plane of the circularly polarized antenna of the double-chained annular slot in the 2.75 GHz band according to a preferred embodiment of the present invention.

FIG. 5E is a diagram showing the radiation pattern of the YZ plane of the circularly polarized antenna of the double-chained annular slot in the 3.1 GHz band according to a preferred embodiment of the present invention.

5F is a YZ plane radiation pattern of a circularly polarized antenna with a double-chained annular slot in the 3.6 GHz band according to a preferred embodiment of the present invention.

1. . . Grounding element

11. . . First polygonal annular slot

12. . . Second polygonal annular slot

2. . . Feeding component

9. . . Insulating dielectric layer

91. . . Upper surface

92. . . lower surface

Claims (10)

A circularly polarized antenna with a double-chained annular slot, comprising: an insulating dielectric layer having an upper surface and a lower surface; a grounding member disposed on the upper surface of the insulating dielectric layer Having a first polygonal annular slot and a second polygonal annular slot, wherein the first polygonal annular slot and the second polygonal annular slot partially overlap; And a feed element disposed on the lower surface of the insulating dielectric layer, wherein the feed element passes the first polygonal annular slot and the second polygonal annular slot to energize Coupled to the grounding element to provide the circularly polarized antenna with a plurality of operating frequency bands. The circularly polarized antenna of claim 1, wherein the first polygonal annular slot and the second polygonal annular slot are circular or rectangular. The circularly polarized antenna of claim 1, wherein the insulating dielectric layer is a printed circuit board substrate. The circularly polarized antenna according to claim 3, wherein the insulating dielectric layer is a rectangular substrate of FR4 material. The circularly polarized antenna of claim 1, wherein the grounding element and the feeding element are each a thin layer of metal. The circularly polarized antenna of claim 1, wherein the feed element is a microstrip line. The circularly polarized antenna according to claim 1, wherein the first working frequency band, the second working frequency band, and the third working frequency band are provided. The circularly polarized antenna of claim 7, wherein the first working frequency band and the third operating frequency band are adjusted by adjusting a size of the first annular slot. The circularly polarized antenna of claim 7, wherein the second operating frequency band is adjusted by adjusting a size of the second annular slot. The circularly polarized antenna according to claim 7, wherein one of the first working frequency bands has a first center frequency of 2.65 to 3 GHz, and one of the second operating frequency bands has a second center frequency of 3.5. Up to 4.4 GHz, one of the third operating frequency bands has a third center frequency between 5 and 5.3 GHz.