TWI654797B - Dual notch antenna and antenna array thereof - Google Patents

Abstract

The present invention provides a double-ended recessed antenna, comprising: a radiating member having a rectangular shape, the radiating member having two corresponding first sides and two second sides disposed between the two first sides, two a recess is formed in each of the middle sides of the first side, the two recesses each having a feeding edge parallel to one of the two first sides and two opposite ends connected to the ends of each feeding edge; The strip has one end electrically connected to the feeding edge of the two grooves. Thereby, the impedance bandwidth of the antenna is effectively improved.

Description

Double-ended recessed antenna and array antenna

The present invention relates to an antenna and an array antenna thereof, and more particularly to an antenna and an array antenna thereof that effectively increase the impedance bandwidth of the double-end recess.

In general, most automotive radar systems use microstrip array antennas, while automotive radar systems use wireless signal transceivers inside the vehicle's bumper or fan grille to transmit and receive millimeter waves (millimeter-wave). ) Wireless signals for applications such as ranging and information exchange. Since the shock absorber styrofoam or fiberglass is usually provided in the vehicle bumper, the available space is extremely limited, and therefore, the radar signal is easily attenuated, thereby increasing the difficulty in designing the array antenna.

Furthermore, the operating frequency range of a general vehicle radar system is generally around 24 GHz and 77 GHz. It is not easy to obtain antenna efficiency at high frequencies, and it is not easy to increase the antenna gain, and it must be matched with space constraints. Therefore, the design of the antenna is increased. Difficulty.

In addition, U.S. Patent No. US 2014/0145909 A1 discloses an antenna and an array antenna comprising a radiating member; a grounding member forming an area, and the radiating member is disposed in the region and opposite to the radiating member The fourth side is formed with an opening; an extending column is electrically connected to the signal feeding end, and is electrically connected to the fourth side of the radiating member, and the other end extends toward the opening of the grounding member; a connecting member, one end of which is electrically connected between the first side and the fourth side of the radiating member, the other end is electrically connected to the grounding member; and a second connecting member is electrically connected to one of the radiating members Between the three sides and the fourth side, the other end is electrically connected to the grounding member.

The fourth side of the radiation member has a concave structure and is electrically connected to the extension column. However, it can be seen from the frequency response diagram of the reflection coefficient of the antenna that the effective bandwidth of the antenna near the frequency of 24 GHz is not good and cannot be performed. Achieve better impedance matching to avoid signal reflection. Moreover, the fourth side of the aforementioned radiating element has a concave structure. In the basic antenna theory, the related structural design has been mentioned, which can increase the bandwidth, but is not suitable for the array antenna.

Therefore, how to improve the above shortcomings and increase the antenna efficiency and impedance bandwidth are to be solved by relevant industry players.

In order to solve the above problems, an embodiment of the present invention provides a double-ended recessed antenna and an array antenna thereof, which can effectively improve the impedance bandwidth of the antenna, and is suitable for the array antenna design to achieve an optimized antenna radiation field. type.

An embodiment of the present invention provides a double-ended recessed antenna, comprising: a radiating member having a rectangular shape, the radiating member having two corresponding first sides and two first sides disposed between the two first sides a groove is formed in each of the two sides of the first side, and each of the two grooves has a feeding edge parallel to one of the two first sides and two ends connected to the two ends of each feeding edge. And a microstrip line, each end of which is electrically connected to the feeding edge of the two grooves.

In another embodiment of the present invention, a double-ended recessed array antenna is provided, comprising: a plurality of radiating members having a rectangular shape, each radiating member having two corresponding first sides and being disposed on the two first sides a second side of the two sides, a recess is formed in each of the first side edges, and the two recesses each have a feeding edge parallel to one of the first side edges and are coupled to each of the feeding sides The two end edges of the end; and the plurality of microstrip lines are electrically connected to each feeding edge of each of the radiating members, so that the radiating members are connected in series to form a series array.

According to the above, the efficacies of the present invention can be achieved by recessing a recess on each of the first sides of the radiating member so that the microstrip line can properly extend into the recess and be fed in place. The edges are electrically connected to achieve the best impedance matching to avoid signal reflection problems.

Furthermore, the first side of each of the radiating members is recessed with a groove, and the impedance of each antenna feed can be adjusted to effectively increase the effective bandwidth of the antenna.

Moreover, when the radiating elements are connected in series in a series array, the external frequency width can be improved, and better impedance matching can be obtained, thereby optimizing the antenna radiation pattern.

1‧‧‧ boards

2‧‧‧ substrate layer

3‧‧‧ Grounding layer

4‧‧‧ first side

5‧‧‧ second side

10‧‧‧radiation parts

10a‧‧‧radiation parts

11‧‧‧ first side

12‧‧‧Second side

13‧‧‧ Groove

13a‧‧‧first groove

13b‧‧‧second groove

131‧‧‧Feeding side

132‧‧‧Offside

20‧‧‧Microstrip line

30‧‧‧Series array

F1‧‧‧ Impedance bandwidth

F2‧‧‧ Impedance bandwidth

1 is a schematic view of an antenna of the present invention.

2 is a schematic view of an array antenna of the present invention.

3 is a schematic view showing the array antenna of the present invention disposed on a substrate.

Figure 4 is a partially enlarged cross-sectional view of Figure 3.

Figure 5 is a schematic diagram showing the frequency response of the reflection coefficient of the antenna of the present invention.

6 is a schematic diagram showing a comparison of the frequency response of the reflection coefficient of the array antenna of the present invention and a general array antenna.

Figure 7 is a schematic diagram showing the current vector density of the radiation member of the present invention.

For the convenience of the description, the central idea expressed by the present invention in the column of the above summary of the invention is expressed by the specific embodiments. Various items in the embodiments are depicted in terms of ratios, dimensions, amounts of deformation, or displacements that are suitable for illustration, and are not drawn to the proportions of actual elements, as set forth above.

Referring to FIG. 1 , FIG. 5 , FIG. 6 and FIG. 7 , an embodiment of the present invention provides a double-ended recessed antenna. In the embodiment of the present invention, the double-ended recessed antenna is a microstrip antenna. The double-ended recessed antenna is disposed on a circuit board 1. The circuit board 1 has a substrate layer 2 and a ground layer 3 stacked on each other. The substrate layer 2 has a first surface 4 and a second surface oppositely disposed. 5. The antenna of the double-ended recess is disposed on the first surface 4, and the ground layer 3 is coupled to the second surface 5. The double-ended recessed antenna comprises: a radiating member 10 having a rectangular shape, and the radiating member 10 has two corresponding first side edges 11 and two second side edges 12 disposed between the two first side edges 11, two One side 11 is parallel to each other, and a recess 13 is recessed in each of the first side edges 11 . The two recesses 13 each have a feeding edge 131 parallel to one of the first side edges 11 and are coupled to each of the feeds. In the embodiment of the present invention, the two end edges 132 are parallel to the two second sides 12, and the two end edges 132 and the feeding edge 131 are perpendicular to each other. Thereby, the impedance bandwidth of the antenna feeding of the double-ended recess can be adjusted through the two recesses 13.

Furthermore, the length of the two second side edges 12 is between 1 and 2 times the length of the two first side edges 11, in other words, the length of the two second side edges 12 is equal to the length of the two first side edges 11, or two The length of the two side edges 12 is at most equal to twice the length of the two first side edges 11; the length of each of the first side edges 11 is between 2.5 and 5.5 times the length of each feeding edge 131, wherein each first The length of the side edges 11 is 1.5 mm to 3.5 mm, and the length of each of the second side edges 12 is between 3.5 and 5 times the length of each of the end edges 132. The length of the two end edges 132 is greater than the length of each feeding edge 131. In the embodiment of the present invention, the length of the first side 11 can be one of 1.8 mm, 2 mm, 2.5 mm or 3 mm, and the length of each second side 12 is 3.355 mm, each feed The side of the entry edge 131 is 0.6 mm long.

In addition, in the embodiment of the present invention, the two recesses 13 are respectively a first recess 13a and a second recess 13b, and the length of the two end edges 132 of the first recess 13a and the second recess 13b are separated. The length of the end edge 132 is different. The length of the two end edges 132 of the first groove 13a is smaller than the length of the two end edges 132 of the second groove 13b. The length of the two ends 132 of the first groove 13a is 0.7 mm. The two end edges 132 of the second recess 13b are 0.85 mm in length.

The two microstrip lines 20 are electrically connected to the feeding edges 131 of the two grooves 13 , wherein one microstrip line 20 serves as an input end and the other microstrip line 20 serves as an output end. In the embodiment of the present invention, The two microstrip lines 20 are electrically connected to one end of the feeding edge 131 and perpendicular to the feeding edge 131. The length of each feeding edge 131 is between 2.5 and 3.5 times the width of each microstrip line 20. In the embodiment of the present invention, each microstrip line 20 has a width of 0.2 mm. Thereby, each of the microstrip lines 20 can be appropriately extended into a length of each of the grooves 13 and electrically coupled to each of the feed sides 131 at an appropriate position for optimal impedance matching.

Referring to FIG. 7, the size of the radiation member 10 and the size of the double groove 13 are designed, and the second side 12 and the two grooves 13 of the radiation member 10 have high current intensity, so that the radiation member 10 has high radiation efficiency. Moreover, the current directions of the two second sides 12 are opposite to the current directions of the two microstrip lines 20, so that an optimal impedance matching can be achieved.

Referring to FIG. 2 to FIG. 6 , the double-ended recessed antenna is derivatized as an array antenna. In addition to reducing the required area, the antenna can be adjusted to achieve various antenna effects. In another embodiment of the present invention, a double-ended recess is provided. The array antenna is disposed on the first surface 4 of the substrate layer 2 of the circuit board 1, as shown in FIGS. 3 and 4.

The double-ended recessed array antenna comprises: a plurality of radiating elements 10, each of the first side edges 11 of each radiating element 10 is recessed with a recess 13; and a plurality of microstrip lines 20 electrically connected to each spoke Each of the projecting members 10 feeds into the side 131 such that the radiating members 10 are connected in series to each other to form a series array 30. As shown in FIG. 2, in the embodiment of the present invention, the first recess 13a and the second recess 13b of any two adjacent radiating elements 10 face each other facing each other.

Moreover, the length of the first side edge 11 of the two radiating elements 10 near the two ends of the series array 30 is less than the length of the first side edge 11 of a radiating element 10 located in the middle of the series array 30, and the first two of the radiating elements 10 are first. The length of the side edges 11 is tapered by each of the radiating elements 10 located in the middle of the series array 30 to each of the radiating elements 10 at the ends of the two sides. Wherein each of the first side edges 11 has a length of 1.5 mm to 3.5 mm. In the embodiment of the present invention, the lengths of the two first side edges 11 of each of the radiating members 10 are 1.8 mm, 2 mm, 2.5 mm or 3 mm. The combination.

Referring to FIG. 2, in the embodiment of the present invention, six series of radiating elements 10 having two recesses 13 and one single recess 13 are disposed in the series array 30, wherein the direction from the drawing is The first radiation member 10a is a single groove 13 from the top to the bottom, and the first side 11 of the radiation member 10a has a length of 1.8 mm; the fourth direction is from the top to the bottom, and the fourth is located in the middle of the series array 30. Radiation member 10, and the first side edges 11 of the intermediate radiating member 10 are 3 mm in length; the lengths of the first side edges 11 of the second and sixth radiating members 10 are counted from top to bottom in the drawing direction. 2 mm; the first side 11 of the 3rd and 5th radiating elements 10 from the top in the drawing direction has a length of 2.5 mm; and the 7th radiating element counts from the top to the bottom in the drawing direction The first side edge 11 of 10 has a length of 1.8 mm.

Therefore, referring to FIG. 1 and FIG. 5, the size of the radiation member 10 and the size of the double groove 13 are designed, and when the reflection coefficient curve drops to -10 dB (Return Loss 10 dB), the corresponding operating frequency band is near the frequency of 24 GHz. The impedance bandwidth F1 of the two frequency differences is wider. As shown in FIG. 5, in the embodiment of the present invention, the impedance bandwidth F1 is 23.9392 GHz to 24.4017 GHz.

In addition, as shown in FIG. 6, the array antenna of the double-ended recessed body of the present invention and the general array day The frequency response comparison diagram of the reflection coefficient of the line can clearly show that the impedance bandwidth F1 of the double-ended recessed array antenna of the present invention is wider than the impedance bandwidth F2 of the general array antenna, and therefore, the double-end recess of the present invention The array antenna can effectively increase the impedance bandwidth to achieve an optimized antenna radiation pattern.

Therefore, by the double recess 13 of the radiating member 10, the microstrip line 20 can be appropriately extended into the recess 13 and electrically connected to the feeding edge 131 to achieve optimal impedance matching to avoid signal reflection problem. occur. Moreover, the double groove 13 of the radiating member 10 is designed to adjust the impedance of the feeding of each radiating member 10, thereby effectively increasing the effective bandwidth of the radiating member 10.

In addition, the antenna of the double-ended recessed body of the present invention is derived as an array antenna, which can effectively reduce the required area and achieve various antenna effects through adjustment. Moreover, by connecting the radiating elements 10 in series into the series array 30, it is possible to increase the external frequency width and obtain the best impedance matching.

The above embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention. Any modifications or variations that are made without departing from the spirit of the invention are intended to be protected.

Claims (14)

A double-ended recessed antenna comprising: a radiating member having a rectangular shape, the radiating member having two corresponding first side edges and two second side edges disposed between the two first side edges, the two The first side is parallel to each other, and a recess is recessed in each of the first side edges, and the two recesses each have a feeding edge parallel to one of the two first sides and are coupled to each feeding edge Two end edges of the two ends; and two microstrip lines, each end of which is electrically connected to the feeding edge of the two grooves. The double-ended recessed antenna of claim 1, wherein each of the first sides has a length of 1.5 mm to 3.5 mm. The double-ended recessed antenna of claim 1 or 2, wherein each first side length is between 2.5 and 5.5 times the length of each feed side. The double-ended recessed antenna of claim 1, wherein each feed edge has a length between 2.5 and 3.5 times the width of each microstrip line. The double-ended recessed antenna of claim 1, wherein the length of the two off-sides is greater than the length of each feed-edge. The double-ended recessed antenna of claim 1 or 5, wherein each of the second side lengths is greater than 3.5 times to 5 times the length of each of the off-side sides. The double-ended recessed antenna according to claim 1, wherein one of the microstrip lines serves as an input terminal and the other microstrip line serves as an output terminal. A double-ended recessed array antenna comprising: a plurality of radiating members having a rectangular shape, each of the radiating members having two corresponding first sides and two second sides disposed between the first sides The two first sides are parallel to each other, and the two first sides are at a middle Each recess has a recess, each of the recesses having a feed edge parallel to one of the two first sides and two opposite ends connected to each end of each feed edge; and a plurality of microstrip lines, the electric Sexually coupled to each feeding edge of each of the radiating members, the radiating members are connected in series to each other to form a series array. The double-ended recessed array antenna of claim 7, wherein a length of the first side of the two radiating members adjacent to both ends of the series array is smaller than a length of the first side of one of the radiating members located in the middle of the series array . The double-ended recessed array antenna according to claim 7, wherein each of the first side lengths of each of the radiating members is each radiating member at an end point of one of the radiating members located in the middle of the series array. Gradually. The double-ended recessed array antenna of any one of claims 7 to 9, wherein each of the first sides has a length of 1.5 mm to 3.5 mm. The double-ended recessed array antenna of claim 7, wherein each feed edge has a length between 2.5 and 3.5 times the width of each microstrip line. The double-ended recessed array antenna of claim 7, wherein each second side length is between 3.5 and 5 times the length of each of the off-side sides. The double-ended recessed array antenna according to claim 7, wherein one of the microstrip lines connected to each of the radiating elements serves as an input end, and another microstrip line to which each radiating element is connected serves as an output end.