WO2018133538A1

WO2018133538A1 - Reconfigurable ultra-wideband monopole antenna with notch characteristic

Info

Publication number: WO2018133538A1
Application number: PCT/CN2017/112990
Authority: WO
Inventors: 曲美君; 邓力; 李书芳; 张贯京; 葛新科; 高伟明; 张红治
Original assignee: 深圳市景程信息科技有限公司
Priority date: 2017-01-20
Filing date: 2017-11-25
Publication date: 2018-07-26
Also published as: CN106848544B; CN106848544A

Abstract

Provided is a reconfigurable ultra-wideband monopole antenna with a notch characteristic, comprising a radiation unit, a micro-strip feeder, a dielectric substrate and a ground plate, wherein the radiation unit and the micro-strip feeder are arranged on an upper surface of the dielectric substrate, and the ground plate is arranged on a lower surface of the dielectric substrate; the radiation unit comprises an isosceles trapezoid area and a rectangular area with a width equal to that of a lower bottom of the isosceles trapezoid area and connected to the isosceles trapezoid area, and the rectangular area is provided with an arc gap with the opening thereof facing the lower bottom of the isosceles trapezoid area; several radio frequency switches are arranged on the arc gap; and an upper bottom of the isosceles trapezoid area of the radiation unit is connected to the micro-strip feeder. The reconfigurable ultra-wideband monopole antenna with a notch characteristic of the present invention not only has a complete UWB performance, but also achieves antenna miniaturization while achieving on-demand notch reconfigurability at the same time.

Description

Reconfigurable ultra-wideband monopole antenna with notch characteristics

Technical field

[0001] The present invention relates to the field of microwave communication technologies, and in particular, to a reconfigurable ultra-wideband monopole antenna having a notch characteristic.

Background technique

[0002] Since the Federal Communications Commission announced in 2002 that the 3.1~10.6 GHz band has been used in the commercial field, ultra-wideband (UWB) communication systems with high data transmission rates, low cost, low power consumption, and strong anti-interference ability have been rapidly developed. Ultra-wideband antennas have become a research hotspot of international scholars in recent years. However, the UWB band includes bands such as WLAN and WiMAX, which may cause some interference between them. In the prior art, the technical problem is often solved by notching. Generally, the ultra-wideband antenna implements notching to load a radiation slot or a resonant branch on the antenna, which makes it difficult to ensure complete UWB performance.

[0003] Therefore, there is a need for a reconfigurable ultra-wideband monopole antenna having a notch characteristic.

technical problem

[0004] An object of the present invention is to provide a reconfigurable ultra-wideband monopole antenna having a notch characteristic, which aims to solve the problem that the antenna in the prior art is difficult to ensure complete UWB performance and the antenna size is large.

Problem solution

Technical solution

[0005] In order to achieve the above object, the present invention provides a reconfigurable ultra-wideband monopole antenna having a notch characteristic, comprising a radiating element, a microstrip feeder, a dielectric substrate, and a grounding plate, wherein: the radiating element, The microstrip feed line is disposed on an upper surface of the dielectric substrate, and the ground plate is disposed on a lower surface of the dielectric substrate; the radiation unit includes an isosceles trapezoidal region and a rectangular region that is equal to and connected to a lower bottom of the isosceles trapezoidal region. The rectangular area is provided with a circular arc slit of the lower end of the isosceles trapezoidal region; the circular arc gap is provided with a plurality of radio frequency switches; the upper base and the microstrip of the isosceles trapezoidal region of the radiating unit Feeder connection.

[0006] wherein the arc gap is set at a position where the radiation unit current is the strongest.

[0007] wherein the lower base of the isosceles trapezoidal region of the radiating element is the same as the width of the ground plate.

[0008] wherein the dielectric substrate is an FR4 dielectric substrate having a relative dielectric constant of 4.4 and a thickness of 1.6 mm. [0009] wherein the arc gap is bilaterally symmetric with respect to a center line of the isosceles trapezoidal region of the radiation unit; the microstrip feed line is bilaterally symmetric with respect to a center line of the isosceles trapezoidal region of the radiation unit.

[0010] wherein, the size of the rectangular area of the radiating element is 20 mm x 6.5 mm; the upper base of the isosceles shaped section of the radiating element is 10 mm, the lower bottom is 20 mm, and the height is 3 mm.

[0011] wherein, the inner arc of the circular arc slit has a chord length of 12 mm, the inner arc has a bow height of 4 mm, the circular arc slit has a width of lmm, and the circular arc slit has a radius of 7 mm.

[0012] wherein the microstrip feed line has a width of 3 mm and a length of 15.5 mm.

[0013] wherein, the distance between the chord of the inner arc of the arc gap and the upper base of the isosceles trapezoidal region of the radiation unit is 4.5 mm

[0014] wherein the radio frequency is turned into a PIN diode.

Advantageous effects of the invention

Beneficial effect

[0015] The isosceles trapezoidal region in the reconfigurable ultra-wideband monopole antenna having the notch characteristic of the present invention causes the radiating element to have two chamfer angles, and the two chamfer angles are bilaterally symmetric with respect to the microstrip feed line, Ultra-wideband; Furthermore, the reconfigurable ultra-wideband monopole antenna having the notch characteristic of the present invention generates a notch by a circular arc slit etched on the radiating element, and then can be further controlled by the arc gap Several RF-switched on-off changes the resonant length of the slot, thereby changing the resonant frequency of the antenna, realizing the on-demand reconfigurability of the notch, and finally ensuring the reconfigurable ultra-wideband single with the notch characteristic of the present invention. The same UW B performance of the polar antenna achieves miniaturization of the antenna.

Brief description of the drawing

DRAWINGS

1 is a top plan view of a reconfigurable ultra-wideband monopole antenna having a notch characteristic in a first embodiment of the present invention.

2 is a longitudinal cross-sectional view showing a reconfigurable ultra-wideband monopole antenna having a notch characteristic in the first embodiment of the present invention.

3 is a graph showing reflection coefficients of various state simulations of a reconfigurable ultra-wideband monopole antenna with notch characteristics in an embodiment of the present invention. [0018] FIG.

4 is an optimized reconfigurable ultra-wideband monopole antenna with notch characteristics in an embodiment of the invention. [0019] FIG. Standing wave ratio curve for each state simulation.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described in detail with reference to the preferred embodiments thereof. The following examples are illustrative of the invention, and the invention is not limited to the following examples.

[0021] The present invention proposes a first embodiment, as shown in FIGS. 1 and 2, a reconfigurable ultra-wideband monopole antenna having a notch characteristic, comprising a radiating element 1, a microstrip feeder 2, a dielectric substrate 3, and Ground plate 4. The radiation unit 1 and the microstrip feed line 2 are disposed on an upper surface of the dielectric substrate 3, and the ground plate 4 is disposed on a lower surface of the dielectric substrate 3. The radiation unit 1 includes an isosceles trapezoidal region 11 and an isosceles trapezoidal region. a rectangular area 12 of equal width and connected to the lower bottom of the eleventh, wherein the rectangular area 12 is provided with a circular arc slit 121 whose mouth is facing the lower bottom of the isosceles trapezoidal area 11, the arcuate slit 121 is related to the radiation unit 1, etc. The center line of the waist trapezoidal region 11 is bilaterally symmetrical; the arc gap 1 21 is provided with a plurality of radio frequency switches (in FIG. 1 , three are taken as an example, respectively, S1, S2, and S3); Turning off the PIN diode; the upper bottom of the isosceles trapezoidal region 11 of the radiating element 1 is connected to the microstrip feed line 2, and the microstrip feed line 2 is bilaterally symmetric with respect to the center line of the isosceles trapezoidal region 11 of the radiating element 1; The lower base of the isosceles trapezoidal region 11 of the radiation unit 1 is the same as the width of the ground plate 4.

[0022] The isosceles trapezoidal region 11 in the reconfigurable ultra-wideband monopole antenna having the notch characteristic of the present invention causes the radiating element 1 to have two chamfers, and the two chamfers are symmetric about the microstrip feed line 2 The ultra-wideband is realized; the lower bottom of the isosceles trapezoidal region 11 of the radiating element 1 is the same width as the grounding plate 4, so that the antenna of the present invention has a compact structure and stable radiation performance; further, the antenna of the present invention passes through the radiation The circular arc slit 121 etched on the unit 1 generates a notch, and then the resonant length of the circular arc slit 121 is further changed by controlling a plurality of radio frequency switching openings provided on the circular arc slit 121, thereby changing the resonance of the antenna. The frequency, the on-demand reconfigurability of the notch is achieved, and finally the miniaturization of the antenna is achieved while ensuring the complete UWB performance of the reconfigurable ultra-wideband monopole antenna with the notch characteristic of the present invention.

[0023] In addition, the arcuate slit 121 may be further disposed at a position where the current of the radiation unit 1 is the strongest, and the entire reconfigurable ultra-wideband monopole antenna having the notch characteristic is about the longitudinal center line thereof. Symmetrical, the antenna of the present invention has a better match.

[0024] Based on the first embodiment, the present invention provides a specific embodiment, the dielectric substrate 3 is a rectangular FR4 dielectric substrate having a relative dielectric constant of 4.4 and a thickness of 1.6 mm; With feeder 2 The grounding plate 4 is a copper piece; the radiating element 1, the microstrip feeding line 2, the grounding plate 4, and the circular arc slit 121 are all formed on the copper sheets on the upper and lower surfaces of the dielectric substrate 3 by etching.

In an alternative embodiment of the above-described embodiment, the radiating element 1, the microstrip feed line 2, and the ground plate 4 may also be disposed on the dielectric substrate 3 by transfer.

[0026] Simulation analysis is performed on the above specific embodiment by using the simulation software CST. As shown in FIG. 1, the parameters of the reconfigurable ultra-wideband monopole antenna with notch characteristics are optimized as follows, W (radiation unit, ground plate, and Media substrate width) = 20mm, L (length of ground plate) = 14mm, L1 (length of rectangular area of radiating element) = 6.5 mm, L2 (distance between upper edge of radiating element and edge of ground plate) = l lmm , L3 (the height of the isosceles trapezoid of the radiating element) = 3mm, rl (the chord length of the inner arc of the arc gap) = 12mm, r2 (the bow height of the inner arc of the arc gap) = 4mm, r3 (the arc gap Width) = lmm, r4 (the distance between the chord of the inner arc of the arc gap and the upper base of the isosceles trapezoidal zone of the radiating element) = 4.5 mm, d (the upper base of the isosceles trapezoidal zone of the radiating element and the ground plate Distance between the upper edges) = 1.5 mm, ws (width of the microstrip feed line) = 3 mm, wl (the length in the upper base of the isosceles trapezoidal zone of the radiating element on the right side of the microstrip feed line) = 3.5 mm.

[0027] That is, the length of the microstrip feeder 2 is 15.5 mm; the shape of the chamfer of the radiating element 1 is a right-angled triangle, the two right-angled sides of the right-angled triangle are 3.5 mm and 5 mm, respectively; the radius of the arc-shaped slit 121 is 7 mm. .

[0028] Table 1 shows the specific operational state of the antenna of the present invention.

[] [Table 1]

[0029]

[0030] Table 1 specific working state of a reconfigurable ultra-wideband monopole antenna with notch characteristics

[0031] FIG. 3 shows a reflection coefficient curve of each state simulation of the reconfigurable ultra-wideband monopole antenna with the notch characteristic optimized in the above specific embodiment. As shown in Figure 3, when all three switches are off (off), that is, State 1吋, the antenna has good UWB performance, and the working frequency band (reflection coefficient is less than -10dB) is 3.1~10.7G. Hz, completely covers the working band of ultra-wideband (3.1~10.6GHz); when only S3 is on (on), that is, State2, the antenna has good notch characteristics, and the working frequency band is 3.15~3.96GHz; S2 and S3 are turned on and S1 is broken, that is, State3吋, the effective length of the slot is reduced, the stopband frequency is slightly shifted to the high frequency, and the antenna operating frequency band is 3.57~4.32GHz; when SI and S3 are turned on and S2 is turned off, That is, State4吋, the antenna working frequency band is 4.65~5.96GHz. Therefore, by controlling the on-off of the RF switch to change the resonant length of the slot, the resonant frequency of the antenna can be changed to realize the on-demand reconfigurable of the notch; and the reconfigurable ultra-wideband monopole with the notch characteristic of the present invention The matching of the antennas is better than the prior art.

[0032] FIG. 4 shows the standing wave ratio curve of each state of the optimized antenna. As shown in Figure 4, the working frequency band with a standing wave ratio of less than 2 covers the operating range of the ultra-wideband, and the notch band covers 3.4~3.69 respectively.

GHz, 3.7~4.2 GHz and 5.2 5.875 GHz.

[0033] It should be noted that the number and location of the radio frequency switches in the foregoing embodiments may be correspondingly designed according to specific notch requirements, and the more the number of radio frequency switches, the reconfigurable traps The more abundant the nature; in addition, when d (the distance between the upper bottom of the isosceles trapezoidal region of the radiating element and the upper edge of the ground plate) is between 0 and 2 mm, and the antenna of the present invention can be made better. Matching, d is preferably 1.5 mm.

[0034] In summary, the reconfigurable ultra-wideband monopole antenna with the notch characteristic of the present invention has complete UWB performance, and can change the gap by controlling several radio frequency switching on and off the arc gap. The resonant length, which in turn changes the resonant frequency of the antenna, enables on-demand reconfiguration of the notch, and achieves miniaturization of the antenna.

[0035]

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the contents of the drawings may be directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Industrial applicability

[0037] The isosceles trapezoidal region in the reconfigurable ultra-wideband monopole antenna having the notch characteristic of the present invention causes the radiating element to have two chamfer angles, and the two chamfers are bilaterally symmetric with respect to the microstrip feed line, Ultra-wideband; Furthermore, the reconfigurable ultra-wideband monopole antenna having the notch characteristic of the present invention generates a notch by a circular arc slit etched on the radiating element, and then can be further controlled by the arc gap Several RF-switched on-off changes the resonant length of the slot, which in turn changes the resonant frequency of the antenna, enabling the on-demand of the notch. Reconstructing, and ultimately ensuring, the complete uw of the reconfigurable ultra-wideband monopole antenna with notch characteristics of the present invention

The same performance of the B achieves the miniaturization of the antenna.

Claims

Claim

A reconfigurable ultra-wideband monopole antenna with notch characteristics, characterized in that the reconfigurable ultra-wideband monopole antenna with notch characteristics comprises a radiating element, a microstrip feeder, a dielectric substrate and a grounding plate Wherein: the radiating element, the microstrip feed line is disposed on an upper surface of the dielectric substrate, the grounding plate is disposed on a lower surface of the dielectric substrate; the radiating unit includes an isosceles trapezoidal region and a lower bottom of the isosceles trapezoidal region a rectangular area which is wide and connected, wherein the rectangular area is provided with a circular arc slit of the lower end of the isosceles trapezoidal region; the circular arc gap is provided with a plurality of radio frequency switches; the isosceles of the radiation unit The upper base of the trapezoidal zone is connected to the microstrip feed line. A reconfigurable ultra-wideband monopole antenna having a notch characteristic according to claim 1, wherein said arc slit is provided at a position where the radiation unit current is the strongest.

A reconfigurable ultra-wideband monopole antenna having a notch characteristic according to claim 1, wherein a lower bottom of the isosceles trapezoidal region of the radiating element is the same as a width of the ground plate. The reconfigurable ultra-wideband monopole antenna having a trap characteristic according to claim 1, wherein the dielectric substrate is an FR4 dielectric substrate having a relative dielectric constant of 4.4 and a thickness of 1.6 mm.

A reconfigurable ultra-wideband monopole antenna having a notch characteristic according to claim 3, wherein said arc slit is bilaterally symmetric with respect to a center line of an isosceles trapezoidal region of the radiating element

The microstrip feed line is bilaterally symmetric about a centerline of the isosceles trapezoidal region of the radiating element. The reconfigurable ultra-wideband monopole antenna with notch characteristics according to claim 5, wherein a size of a rectangular area of the radiating element is 20 mm x 6.5 mm; an isosceles trapezoidal area of the radiating element The upper bottom is 10mm, the lower bottom is 20mm, and the height is 3mm.

The reconfigurable ultra-wideband monopole antenna with notch characteristics according to claim 6, wherein the inner arc of the arc gap has a chord length of 12 mm and the inner arc has a bow height of 4 mm; The width of the arc slit is 1 mm, and the radius of the arc slit is 7 mm.

A reconfigurable ultra-wideband monopole antenna having a notch characteristic according to claim 6, wherein said microstrip feed line has a width of 3 mm and a length of 15.5 mm.

The reconfigurable ultra-wideband monopole antenna with notch characteristics according to claim 7, wherein the distance between the chord of the inner arc of the arc gap and the upper base of the isosceles trapezoidal region of the radiating element The distance is 4.5mm.

[Claim 10] The reconfigurable ultra-wideband monopole antenna having the notch characteristic according to claim 1, wherein the radio frequency is a PIN diode.