CN101976763B - Ultra wide band monopole antenna with bandwidth of 2.3 to 20.1GHz - Google Patents

Abstract

The invention relates to an ultra-broadband monopole antenna with a bandwidth of 2.3-20.1GHz, which is characterized in that: a layer of radiator medium is arranged on the FR4 dielectric substrate, a semi-elliptical radiation patch is in the middle, and the radiation patch and CPW feeder Connected; the lower end of the FR4 dielectric substrate is two symmetrical floors, and the CPW feeder passes through the gap between the two said floors; a small C-shaped slot and a large C-shaped slot are arranged along the arc in the lower part of the radiation patch. The small C-slot has a smaller radius than the large C-slot. The invention has a frequency coverage range of 2.3-20.1GHz and a total bandwidth of 17.8GHz, which is wider than that of general ultra-wideband antennas, and adopting the coplanar waveguide feeding technology is beneficial to broaden the bandwidth. The invention has the advantages of simple structure, convenient manufacture and low price, and can well complete the double wave limiting function, so that the UWB system is free from the interference of the frequency band.

Description

An ultra-wideband monopole antenna with a bandwidth of 2.3-20.1GHz

technical field

The invention relates to a monopole antenna, an ultra-wideband monopole antenna with a bandwidth of 2.3-20.1GHz, and a miniaturized planar monopole antenna with dual wave limiting functions.

Background technique

With the increasing demand for wireless communication, ultra-wideband (Ultra-WideBand, UWB) wireless communication technology has attracted much attention due to its advantages of low power consumption, high bandwidth, and low complexity. In 2002, the United States Federal Communications Commission (FCC) Approve the 3.1-10.6GHz frequency band as the application of ultra-wideband technology. However, this frequency band also covers the working frequency bands of Worldwide Interoperability for Microwave Access (WIMAX) (3.3-3.7GHz), C-band satellite communication system and wireless local area network (WLAN) narrowband system (5.15-5.35GHz, 5.725-5.825GHz). In order to suppress the interference of the above-mentioned communication system to the UWB system, a simple and effective method is to make the ultra-wideband antenna generate larger reflections in these frequency bands at the same time, that is, the dual-wave limiting function.

Contents of the invention

technical problem to be solved

In order to solve the above problems, the present invention has designed a kind of bandwidth is the ultra-wideband monopole antenna of 2.3-20.1GHz, satisfies the requirement of ultra-wideband (3.1-10.6GHz), and designs double limit wave function to exclude described frequency band to UWB For system interference, the two-wire wave frequency bands are 3.1-4.4GHz (center frequency 3.6GHz) and 5.1-5.9GHz (center frequency 5.6GHz).

Technical solutions

An ultra-wideband monopole antenna with a bandwidth of 2.3-20.1 GHz, characterized in that it includes an FR4 dielectric substrate 1, a symmetrical floor 2, a radiation patch 3, a small C-shaped slot 4, a large C-shaped slot 5, and a CPW feeder 6; There is a layer of radiator medium on the FR4 dielectric substrate 1, with a semi-elliptical radiation patch 3 in the middle, and the radiation patch 3 is connected to the CPW feeder 6; the lower end of the FR4 dielectric substrate 1 is two symmetrical floors 2, and the CPW feeder 6 is formed by Pass through the gap between the two weighing floors 2; the lower half of the radiation patch 3 is provided with a small C-shaped groove and a large C-shaped groove along the arc, and the radius of the small C-shaped groove is smaller than that of the large C-shaped groove; The radiation patch 3 is a semi-ellipse, the upper part is an ellipse, the middle part is a rectangle, and the lower part is a semicircle.

The size of the FR4 dielectric substrate 1 is 26 mm wide × 34 mm long × 1.5 mm high; the height of the radiator medium is 1.5 mm; the size of the semi-elliptical radiation patch 3 is: the major axis of the upper half is 14 mm, and the minor axis is 10mm; the middle part is a rectangle with a length of 14mm and a width of 7mm; the lower part is a semicircle with a radius equal to 7mm; the size of the CPW feeder 6 is 6.2mm in length and 2mm in width; the size of the symmetrical floor 2 is 11.6mm in length x 5.5 in width mm; the gap between the symmetrical floor and the feeder is 0.4mm; the distance between the semicircle of the lower half of the radiation patch and the upper end of the symmetrical floor is 0.5mm; the center of the small C-shaped groove is vertically downward from the center of the entire antenna by 3.5mm, The width is 0.9mm, and the deployment angle symmetrical to the central axis is 238.26 degrees; the center of the large C-shaped slot deviates 3.7mm vertically downward from the center of the entire antenna, its width is 0.8mm, and the deployment angle symmetrical to the central axis is 273.9 degrees.

The dielectric constant of the radiator medium is 4.4.

The radiation patch is a copper coating.

Beneficial effect

The invention proposes an ultra-wideband monopole antenna with a bandwidth of 2.3-20.1GHz and dual-wave limiting functions. Using FR4 materials, a miniaturized planar monopole antenna for ultra-wideband systems is designed, and coplanar waveguide is used for feeding , Symmetrical floor, the radiation patch adopts the structure of semi-ellipse, rectangle and ellipse, so that the standing wave ratio in the frequency band of 2.3-20.1GHz is <2, and the open-loop resonant structure (two non-concentric C type slot) to achieve frequency band suppression, so that the standing wave ratio in the 3.1-4.4GHz and 5.1-5.9GHz frequency bands is >2, completing the wave limiting function and avoiding interference.

The invention has a frequency coverage range of 2.3-20.1GHz and a total bandwidth of 17.8GHz, which is wider than that of general ultra-wideband antennas, and adopting the coplanar waveguide feeding technology is beneficial to broaden the bandwidth. The invention has the advantages of simple structure, convenient manufacture and low price, and can well complete the double wave limiting function, so that the UWB system is free from the interference of the frequency band.

Description of drawings

Figure 1: Structural diagram of the present invention

Figure 2: Front side view of Figure 1

Figure 3: Left side view of Figure 1

1-FR4 dielectric substrate, 2-symmetrical floor, 3-radiating patch, 4-small C-shaped slot, 5-large C-shaped slot, 6-CPW feeder;

Figure 4: Comparison of the simulation and measured reflection coefficient of the antenna before and after slotting;

Figure 5: Comparison of the standing wave ratio of the antenna before and after slotting.

Detailed ways

Now in conjunction with accompanying drawing, embodiment the present invention is further described:

FIG. 1 is a structural diagram of the present invention, FIG. 2 is a top view of FIG. 1 , and FIG. 3 is a left side view of FIG. 1 . The radiator medium of the antenna is printed on the FR4 dielectric substrate 1 , the dimensions of the dielectric substrate are: width 26mm×length 34mm×height 1.5mm, the dielectric constant of the medium is 4.4, and the height of the medium is 1.5mm. The size of the whole antenna is very small, similar to the size of a dollar coin. The material used for the radiation patch 3 of the antenna is a copper cladding layer, which is a very thin layer of conductor with almost no thickness. The radiation patch is semi-elliptical, the major axis of the upper part is 14 mm, and the minor axis is 10 mm; the middle part is a rectangle with a length of 14 mm and a width of 7 mm; the lower part is a semicircle with a radius equal to 7 mm. The radiation patch is connected to a CPW feeder 6 with a length of 6.2 mm×a width of 2 mm, so that the antenna has a wider bandwidth. The CPW feeder composed of the symmetrical floor 2 with a length of 11.6 mm×a width of 5.5 mm, a CPW feeder and a dielectric substrate feeds the radiator of the antenna, so as to widen the working bandwidth of the antenna. The size of the gap between the side of the floor and the feeder is 0.4 mm, and the distance between the semicircle of the lower half of the antenna radiation patch 3 and the upper part of the floor is 0.5 mm. The length of the small C-shaped slot 4 determines the position of the high-frequency wave limiting, and the large C-shaped slot 5 determines the position of the low-frequency wave limiting. The center of the small C-shaped slot deviates 3.5mm vertically downward from the center of the entire antenna, its width is 0.9mm, and the expansion angle symmetrical to the central axis is 238.26 degrees; the center of the large C-shaped slot deviates 3.7 vertically downward from the center of the entire antenna mm, its width is 0.8mm, and the expansion angle symmetrical to the central axis is 273.9 degrees. It can be seen from the figure that the length of the large C-shaped slot is longer than that of the small C-shaped slot. It can be concluded that the longer the length of the slot, the lower the position of the wave limiting will be. The existence of the large C-shaped slot and the small C-shaped slot introduces resonance. The introduction of these two C-shaped slots on the basis of the antenna without slots can obtain the wave limiting function. It has a wider bandwidth than ordinary antennas and is very good. Avoid the interference of the frequency band to the UWB system. Figure 4 is the comparison of the simulation and measured reflection coefficient of the antenna before and after slotting. It can be seen from Figure 4 that except for 3.1-4.4GHz and 5.1-5.9GHz, the return loss at the entire 2.3-20.1GHz is less than -10dB, which indicates that the wave limiting function has been successfully completed and has a bandwidth of 17.8GHz. Figure 5 is a comparison of the standing wave ratio of the antenna before and after slotting. It can also be seen that except for 3.1-4.4GHz and 5.1-5.9GHz, the standing wave ratio of the entire 2.3-20.1GHz is less than 2 Once again, it proves that the position and bandwidth of the wave limit meet the standards, successfully excluding the Worldwide Interoperability for Microwave Access (WIMAX) (3.3-3.7GHz), the C-band satellite communication system and the wireless local area network (WLAN) narrowband system (5.15-5.35GHz, 5.725 -5.825GHz) to UWB system interference.

Claims (4)

1. A bandwidth of 2.3-20.1GHz ultra-wideband monopole antenna is characterized in that comprising FR4 dielectric substrate (1), symmetrical floor (2), radiation patch (3), small C-shaped groove (4), Large C-shaped slot (5) and CPW feeder (6); a layer of radiator medium is provided on the FR4 dielectric substrate (1), with a semi-elliptical radiation patch (3) in the middle, and the radiation patch (3) and CPW feeder (6) are connected; the lower end of the FR4 dielectric substrate (1) is two symmetrical floors (2), and the CPW feeder (6) passes through the gap between the two symmetrical floors (2); under the radiation patch (3) The half part is provided with a small C-shaped groove and a large C-shaped groove along the arc, and the radius of the small C-shaped groove is smaller than that of the large C-shaped groove; the radiation patch (3) is a semi-ellipse, the upper half is an ellipse, and the middle part It is a rectangle, and the lower half is a semicircle. 2. the bandwidth according to claim 1 is the ultra-broadband monopole antenna of 2.3-20.1GHz, it is characterized in that: described FR4 dielectric substrate (1) size is wide 26mm * long 34mm * high 1.5mm; Radiator The height of the medium is 1.5mm; the size of the semi-elliptical radiation patch (3) is: the long axis of the upper part is 14mm, and the short axis is 10mm; the middle part is rectangular, with a length of 14mm and a width of 7mm; A semicircle with a radius equal to 7mm; the size of the CPW feeder (6) is 6.2mm in length and 2mm in width; the size of the symmetrical floor (2) is 11.6mm in length × 5.5mm in width; the gap between the symmetrical floor and the feeder is 0.4mm; The distance between the semicircle of the lower half of the chip and the upper end of the symmetrical floor is 0.5mm; the center of the small C-shaped slot deviates 3.5mm vertically downward from the center of the entire antenna, its width is 0.9mm, and the expansion angle symmetrical to the central axis is 238.26 degrees; The center of the large C-shaped slot deviates 3.7mm vertically downward from the center of the entire antenna, its width is 0.8mm, and the expansion angle symmetrical to the central axis is 273.9 degrees. 3. The ultra-wideband monopole antenna with a bandwidth of 2.3-20.1 GHz according to claim 1 or 2, wherein the dielectric constant of the radiator medium is 4.4. 4. The ultra-wideband monopole antenna with a bandwidth of 2.3-20.1 GHz according to claim 1 or 2, wherein the radiation patch is a copper coating.

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