CN210015958U

CN210015958U - Equilateral triangular ring structure gap broadband antenna

Info

Publication number: CN210015958U
Application number: CN201921416905.1U
Authority: CN
Inventors: 王友保; 张明月; 李燎原
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2019-08-29
Filing date: 2019-08-29
Publication date: 2020-02-04
Anticipated expiration: 2029-08-29

Abstract

The utility model discloses an equilateral triangle loop constructs gap broadband antenna, including the medium base plate to and cover the copper sheet on this medium base plate, set up equilateral triangle loop gap on the copper sheet, set up rectangle minor matters groove in the outside symmetry respectively on the both sides limit in equilateral triangle loop gap simultaneously, through asymmetric current source feed in feed point department on the base, positive negative pole meets the interior limit and the outside in equilateral triangle loop gap respectively. The antenna has the advantages that: firstly, the impedance bandwidth is obviously improved, secondly, the narrow-slit broadband antenna has novel structure, good performance and wide practical scene application significance, is easy to manufacture while keeping the narrow-slit characteristic, and moreover, the antenna has simple structure and is easy to be conformal, and can provide certain reference for the research of the narrow-slit broadband slot antenna.

Description

Equilateral triangular ring structure gap broadband antenna

Technical Field

The utility model belongs to the technical field of wireless communication and specifically relates to a equilateral triangle ring structure gap broadband antenna is related to.

Background

In recent years, with the continuous maturation of wireless communication technology, communication devices are continuously developing toward small integration, broadband, and intelligence. As a key part of receiving signals in a wireless communication system, antennas are also required to be miniaturized and broadband. Microstrip antennas have the advantages of low profile, light weight, low cost, easy microwave circuit integration and the like, are researched more and more, and are widely applied to the field of wireless communication such as radars, satellites and the like. However, the narrow-band characteristic of microstrip antennas severely limits the applications under increasing broadband requirements.

The microstrip slot antenna is used as one of the microstrip antennas, not only has the advantages of the traditional microstrip antenna, but also is easy to be conformal with other objects. Since the twentieth and forty years, they have been proposed and studied intensively. By microstrip slot antenna is meant that the width of the slot is much narrower relative to its slot length and operating wavelength, and only one mode is excited and used. Therefore, the microstrip slot antenna is also affected by the narrow working bandwidth, which limits its wide application in the wireless communication field. In order to meet the requirement of modern wireless communication broadband, many types of microstrip slot antennas have been proposed in the past, most of which are not easily conformal, and the width of the slot and the length thereof are approximately equivalent, and when fed by a wider microstrip line in a wide slot region, two orthogonal modes will be excited in the slot at the same time. As the area of the surrounding ground plane decreases, the current on the tuning stub will mainly affect the actual radiation. Such antennas are not considered slot microstrip antennas in the strict sense of the word. In order to significantly enhance the bandwidth of the microstrip slot antenna while maintaining the characteristic structure of the slot antenna slot, additional non-radiating resonances may be introduced through the parasitic resonator or along the feed line portion. By using the virtual short circuit concept, adopting the multi-pole slot combination, introducing the parasitic through hole and utilizing the multi-mode resonance (resonance) concept, various broadband slot (slot) antenna researches are provided. A great deal of research is done on microstrip slot broadband antennas in recent years by luwenjun et al. By utilizing the idea of 'multi-mode resonance', an odd mode is excited in the slot, an even mode is inhibited, and a pair of slot roots are introduced around the zero point of an electric field for disturbance, so that the broadband characteristic of the slot antenna is realized, and the broadband requirement of an actual wireless communication system is met.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to overcome the not enough of background art, the utility model discloses an equilateral triangle loop constructs gap broadband antenna.

The technical scheme is as follows: the utility model discloses an equilateral triangle loop constructs gap broadband antenna, including the medium base plate to and cover the copper sheet on this medium base plate, set up equilateral triangle loop gap on the copper sheet, set up rectangle minor matters groove in the outside symmetry respectively on the both sides limit in equilateral triangle loop gap simultaneously, feed point department on the base is through asymmetric current source feed, and positive negative pole meets the interior limit and the outside in equilateral triangle loop gap respectively.

The antenna excites a plurality of modes in asymmetric positions in a triangular ring slot ring by utilizing a multimode resonance idea, and a branch groove is added in the slot ring, so that a resonance point is deviated, a resonance loop is increased, and the bandwidth of the slot antenna is improved. The antenna has good antenna performance, the designed antenna can be used in LTE 40 and 41 frequency band wireless communication systems, and the triangular ring structure slot can provide certain reference for the research of the broadband slot microstrip antenna.

Furthermore, the dielectric substrate is made of FR4 material with the dielectric constant of 4.4 and the loss angle of 0.027. The specific size is 65mm in length, 65mm in width and 0.8mm in height.

Furthermore, the rectangular branch groove is perpendicular to the side of the equilateral triangular ring gap.

Meanwhile, the groove width of the rectangular branch groove is equal to the gap width of the equilateral triangular ring gap.

Furthermore, the feed point is located 6mm from the midpoint of the base, the width of the rectangular branch groove and the width of the gap of the equilateral triangular ring gap are both 2mm, the length of the rectangular branch groove is 17mm, the distance from the outer triangular vertex angle of the equilateral triangular ring gap is 24.5mm, and the length of the inner triangular side of the equilateral triangular ring gap is 30 mm.

Has the advantages that: compared with the prior art, the utility model has the advantages that: firstly, the impedance bandwidth of the narrow slot antenna is obviously improved to 48.3%. And moreover, the antenna has a simple structure, is easy to be conformal, and can provide certain reference for the research of the narrow-slit broadband slot antenna.

Drawings

Fig. 1 is a schematic structural plan view of the present invention;

fig. 2 is a basic prototype antenna of a slot antenna;

FIG. 3 is a return loss plot for a basic prototype antenna;

fig. 4 is a return loss diagram of the antenna of the present invention;

fig. 5 is a characteristic diagram of the return loss pattern of the antenna of the present invention varying with the slot width;

fig. 6 is a characteristic diagram of the return loss of the antenna of the present invention as the length of the branches changes;

fig. 7 is a characteristic diagram of the return loss of the antenna of the present invention as the position of the minor matters changes;

FIG. 8 shows current distribution diagrams (a), (b), and (c) of the antenna of the present invention at 2.4GHz, 2.8GHz, and 3.1GHz, respectively;

fig. 9 shows E, H plane patterns (a), (b), and (c) of the antenna of the present invention at 2.4GHz, 2.8GHz, and 3.1GHz, respectively;

fig. 10 is a graph of gain versus efficiency for the antenna of the present invention.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and examples.

The slot broadband antenna with the equilateral triangle ring structure shown in fig. 1 comprises a dielectric substrate and a copper sheet 1 coated on the dielectric substrate, wherein the dielectric substrate is 65mm long, 65mm wide and 0.8mm high, and is made of FR4 material with a dielectric constant of 4.4 and a loss angle of 0.027.

The copper sheet 1 is provided with an equilateral triangle ring gap 2, the equilateral triangle ring gap 2 is positioned at the central position on the copper sheet 1, and the equilateral triangle ring gap 2 is formed insideThe regular triangle and the outer triangle are formed, the distance between the regular triangle and the outer triangle is a gap width w, wherein the side length of the inner regular triangle is S, the two side edges of the equilateral triangle ring gap 2 are respectively provided with a rectangular branch groove 3 outwards symmetrically, the length of the rectangular branch groove 3 is d, the distance from the outer triangle vertex angle of the equilateral triangle ring gap 2 is L, the rectangular branch groove 3 is vertical to the side edge of the equilateral triangle ring gap 2, the groove width of the rectangular branch groove 3 is equal to the gap width of the equilateral triangle ring gap 2 and is w, and the distance from the midpoint L on the bottom edge is w₁The distance of the length selects a feed point 4, a 50-ohm current source is used for feeding, the positive pole and the negative pole are respectively connected with the inner triangle and the outer triangle of the equilateral triangular ring slot 2, through feeding at the asymmetric positions, not only odd-even is excited to inhibit even-mode, but also various radiation modes can be excited in the narrow slot, the position and the length of the rectangular branch node slot are changed to increase a current loop and disturb a resonance point, and therefore the bandwidth of the slot antenna is achieved.

The antenna of the patent selects d to be 17mm, L to be 24.5mm, S to be 30mm, w to be 2mm, L₁＝6mm。

This patent utilizes multimode resonance thought, has designed an equilateral triangle loop structure gap broadband antenna, utilizes multimode resonance notion to excite out a plurality of modes at triangle loop gap ring asymmetric position in, through add minor matters groove in the gap ring to make resonance point skew and resonant circuit increase, thereby improve the gap antenna bandwidth. The antenna has good antenna performance, can be used in LTE 40 and 41 frequency band wireless communication systems, and has obvious advantages compared with the prior art. First, compared with

documents

1, 2, 3, and 4, the impedance bandwidth of the narrow slot antenna is significantly improved to 48.3%. The bandwidth of document 1 is 32.7%, and document 1: lu and L.Zhu, "A Novel Wideband Slotline extension with DualResonance: Principle and Design Approach," in IEEE extensions and WirelessPropagation Letters, vol.14, pp.795-798,2015. The bandwidth of document 2 is 32.5%, and document 2: lu and dL. Zhu, "Wireless Stub-Loaded Slotline Antennas Under Multi-Mode response operation," in IEEE Transactions on Antennas and Propagation, vol.63, No.2, pp.818-823, feb.2015. The bandwidth of document 3 is 33.2%, and document 3: guo, W.Lu, Z.Zhang and L.Zhu, "Wireless non-transforming-wave triple-mode slotline antenna," in IET Microwaves, Antennas & Propagation, vol.11, No.6, pp.886-891,1252017. The bandwidth of document 4 is 18.3%, 4 document 4: chu, "associating band of Slot Antennas With combined characteristics models," in IEEE Transactions on Antennas and Propagation, vol.66, No.6, pp.3148-3153, June 2018.

And secondly, while keeping the narrow-slit characteristic, compared with

documents

1, 2, 3 and 4, the antenna has the advantages of novel structure, good performance, easy manufacture and wide practical scene application significance, and moreover, the antenna has a simple structure, is easy to conform, and can provide certain reference for the research of the narrow-slit broadband slot antenna.

Fig. 2 shows a basic prototype of a slot antenna, and fig. 3 shows a return loss diagram of the basic prototype of a slot antenna. It can be seen from fig. 3 that the bandwidth of the antenna is 2.31-2.74GHz (S11<10dB), the bandwidth is only 17%, and the bandwidth is narrow.

The antenna model designed by the method is subjected to simulation optimization through electromagnetic simulation software Ansoft HFss 13.0. The utility model discloses a return loss graph of antenna is shown in fig. 4, and return loss graph is shown along with the characteristic that the gap width changes as in fig. 5, and is 17mm, L ═ 24.5mm, and s ═ 30mm is fixed under the circumstances, can discover by the emulation result in all the other parameters d, when w ═ 2mm, when both guaranteeing the narrow slit characteristic, also can be relative ideal return loss parameter.

Fig. 6 shows the characteristic of the return loss of the antenna as a function of the length d of the branch (rectangular branch groove), and fig. 7 shows the characteristic of the return loss of the antenna as a function of the position of the branch. According to the antenna designed according to the multimode resonance idea, under the condition that the narrow gap is kept to be 2mm, the resonant loop can be effectively increased by increasing the length of the slot branches or changing the positions of the branches, so that the bandwidth of the slot antenna is widened. Fig. 6 shows that when the length of the branch is d equal to 10mm, the return loss of the antenna is only 3.02-3.17GHz less than-10 dB, and the effect is not good, so that the communication requirement cannot be met. With the increase of the length of the branch, not only the bandwidth of the antenna is further improved, but also the return loss is ideal on the whole, and the performance of the antenna is obviously improved. According to the simulation result, d is 17mm and is selected as the optimum size of the branch of the designed equilateral triangle loop slot antenna.

From fig. 7, it can be found that the return loss parameter of the antenna is also greatly affected by the difference of the positions of the antenna branches. When the slot branch is far from the bottom edge (L is 15mm), the antenna has narrow-band characteristics, and the bandwidth range is 2.25-2.63 GHz. When the distance is close, the bandwidth is obviously improved, and when the branch position is 26.5mm away from the bottom edge L, the bandwidth of the antenna ranges from 1.95 GHz to 2.96GHz and from 3.11 GHz to 3.40 GHz. According to the result of HFss simulation, the ideal length that we finally determined is L ═ 24.5 mm. After other parameters are optimized, when L is 24.5mm, the broadband range of the antenna is 2.01-3.29GHz, the relative bandwidth reaches 48.3%, and the return loss S11 can reach more than 35dB at least.

To further illustrate the overall performance of the antenna, current profiles of 2.4GHz, 2.8GHz, and 3.1GHz, respectively, are given, as shown in fig. 8. From fig. 8 we can see. At 2.4GHz, the current is mainly distributed on the bottom edge and two side branches, and the 2.4GHz resonance mode is mainly generated by the current of the two parts. When increasing with frequency to 2.8GHz, the current is mainly concentrated at the apex and left limb of the equilateral triangular ring. When the resonance mode is 3.2GHz, the resonance is mainly generated by the lower right corner of the bottom edge and the right branch node radiating unit.

As shown in fig. 9, the E, H plane directional diagram of the antenna of the present invention (a)2.4GHz (b)2.8GHz (c)3.1GHz, as can be seen from the figure, the present invention provides an antenna with good radiation performance and stable radiation.

Fig. 10 shows a simulated gain and efficiency diagram of the antenna of the present invention. It can be seen that the antenna gain designed by the utility model is larger than 3.5db in the loan range, and the whole efficiency is more than 95%. The designed antenna can meet the requirements of actual scenes and can be applied to a wide range of wireless communication systems.

Claims

1. The utility model provides an equilateral triangle ring structure gap broadband antenna which characterized in that: the medium-frequency power supply device comprises a medium substrate and a copper sheet (1) covered on the medium substrate, wherein an equilateral triangular ring gap (2) is formed in the copper sheet (1), rectangular branch grooves (3) are respectively formed in two side edges of the equilateral triangular ring gap (2) in an outward symmetrical mode, a feed point (4) on the bottom edge feeds power through an asymmetric current source, and the positive electrode and the negative electrode are respectively connected with the inner edge and the outer edge of the equilateral triangular ring gap (2).

2. The equilateral triangular ring structure slot broadband antenna of claim 1, wherein: the dielectric substrate is made of FR4 material with the dielectric constant of 4.4 and the loss angle of 0.027.

3. The equilateral triangular ring structure slot broadband antenna of claim 1, wherein: the length of the medium substrate is 65mm, the width is 65mm, and the height is 0.8 mm.

4. The equilateral triangular ring structure slot broadband antenna of claim 1, wherein: the rectangular branch groove (3) is vertical to the side edge of the equilateral triangular ring gap (2).

5. The equilateral triangular ring structure slot broadband antenna of claim 1, wherein: the groove width of the rectangular branch groove (3) is equal to the gap width of the equilateral triangular ring gap (2).

6. The equilateral triangular ring structure slot broadband antenna of claim 1, wherein: the feed point (4) is located place base distance mid point 6mm department, the groove width of rectangle minor matters groove (3) is 2mm with the gap width of equilateral triangle ring gap (2), the groove length of rectangle minor matters groove (3) is 17mm, and the distance apart from the outer triangle apex angle of equilateral triangle ring gap (2) is 24.5mm, the interior triangle length of side of equilateral triangle ring gap (2) is 30 mm.