A multi-notch ultra-wideband cylindrical conformal antenna fed by coplanar waveguide

Abstract

The present invention discloses a multi-notch ultra-wideband cylindrical conformal antenna fed by a coplanar waveguide, wherein the dielectric substrate is made of F4B, the metal ground plane is arranged on the front of the dielectric substrate, the metal ground plane is rectangular, the metal ground plane includes two pieces, and the two metal ground planes are symmetrically arranged on both sides of a microstrip feeder; the conformal antenna also includes: a first rectangular open-loop resonator, the first rectangular open-loop resonator includes two pieces, the first rectangular open-loop resonator is a rectangular open-loop groove opened on the metal ground plane, the two first rectangular open-loop resonators are symmetrically arranged on both sides of the microstrip feeder, and the opening of the first rectangular open-loop resonator is located on the side of the first rectangular open-loop resonator away from the microstrip feeder. This solves the problem that the trap antenna cannot be bent during installation in the prior art, and even if the shape of the existing trap antenna is bent, this will cause a huge change in the trap frequency of the trap antenna, making the trap antenna unusable.

Description

Technical Field

[0001] The invention relates to the field of radio technology, and in particular to a coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna. Background Art

[0002] In recent years, research on ultra-wideband (Ultra-Wideband) antennas has attracted more and more attention, especially after the FCC designated the 3.1-10.6 GHz frequency band as a civilian frequency band in 2002, an ultra-wideband antenna for this frequency band was developed. This frequency band subsequently overlapped with some existing frequency bands, such as the WiMAX band uplink and downlink frequencies, the INSAT band downlink frequencies, and the WLAN band downlink frequencies. These narrowband signals will generate electromagnetic interference to the ultra-wideband communication system. To eliminate these interferences, band-stop filters or notch antennas are usually used to suppress them. However, the use of band-stop filters will increase the size, cost and complexity of the antenna. When using notch antennas, the existing notch antennas have the problem of being unable to change their shape and cannot adapt to the strict space requirements of portable devices. First, because the dielectric substrate (5) of the existing notch antennas is made of hard materials such as Rogers 5880, the notch antennas cannot be bent during installation; second, even if the shape of the existing notch antennas is bent, this will cause a huge change in the notch frequency of the notch antennas, making the notch antennas unusable.

[0003] There is an urgent need for a notch antenna that can be bent and has a small change in notch frequency after bending, so as to meet the stringent space requirements of portable devices. Summary of the invention

[0004] In order to solve the above shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a coplanar waveguide fed multi-notch ultra-wideband cylindrical conformal antenna.

[0005] The technical solution of the present invention is: a multi-notch ultra-wideband cylindrical conformal antenna fed by a coplanar waveguide, comprising:

[0006] dielectric substrate;

[0007] Metal ground plane;

[0008] A radiation patch, wherein the radiation patch is oval;

[0009] Arc-shaped open-ring resonators, the arc-shaped open-ring resonators include three arc-shaped open-ring resonators, and the three arc-shaped open-ring resonators are opened in the radiation patch;

[0010] A microstrip feed line, wherein the microstrip feed line is arranged on the front side of the dielectric substrate and is electrically connected to the radiation patch;

[0011] The dielectric substrate is made of F4B, the metal ground plane is arranged on the front of the dielectric substrate, the metal ground plane is rectangular, and the metal ground plane includes two pieces, which are symmetrically arranged on both sides of the microstrip feeder;

[0012] The conformal antenna further comprises:

[0013] The first rectangular open-loop resonator includes two first rectangular open-loop resonators, which are rectangular open-loop grooves opened on the metal grounding surface. The two first rectangular open-loop resonators are symmetrically arranged on both sides of the microstrip feeder. The opening of the first rectangular open-loop resonator is located on the side of the first rectangular open-loop resonator away from the microstrip feeder, and the side where the opening of the first rectangular open-loop resonator is located is parallel to the length direction of the microstrip feeder.

[0014] Furthermore, it also includes:

[0015] The second rectangular open-loop resonator comprises two second rectangular open-loop resonators, the second rectangular open-loop resonators are rectangular open-loop grooves opened on the metal grounding plane, the two second rectangular open-loop resonators are symmetrically arranged on both sides of the microstrip feeder, the opening of the second rectangular open-loop resonator is located on the side of the second rectangular open-loop resonator away from the microstrip feeder, the two second rectangular open-loop resonators are respectively located in the first rectangular open-loop resonators on the left and right sides, the side where the opening of the second rectangular open-loop resonator is located is parallel to the length direction of the microstrip feeder, the second rectangular open-loop resonator has the same upper and lower spacing as the first rectangular open-loop resonator, and the second rectangular open-loop resonator has the same left and right spacing as the first rectangular open-loop resonator.

[0016] Furthermore, it also includes:

[0017] The third rectangular open-loop resonator includes two third rectangular open-loop resonators, which are rectangular open-loop grooves opened on the metal grounding surface. The two third rectangular open-loop resonators are symmetrically arranged on both sides of the microstrip feeder. The opening of the third rectangular open-loop resonator is located on the side of the third rectangular open-loop resonator away from the microstrip feeder, wherein one third rectangular open-loop resonator is located on the left side of the first rectangular open-loop resonator on the left side of the microstrip feeder, and the other third rectangular open-loop resonator is located on the right side of the first rectangular open-loop resonator on the right side of the microstrip feeder. The side where the opening of the third rectangular open-loop resonator is located is parallel to the length direction of the microstrip feeder.

[0018] Further, the length of the first rectangular open-ring resonator is 22.1 mm±0.1 mm, the opening length of the first rectangular open-ring resonator is 0.7 mm±0.01 mm, and the width of the first rectangular open-ring resonator is 0.2 mm±0.01 mm;

[0019] The length of the second rectangular open-ring resonator is 16.5 mm ± 0.1 mm, the opening length of the second rectangular open-ring resonator is 0.7 mm ± 0.01 mm, and the width of the second rectangular open-ring resonator is 0.2 mm ± 0.01 mm;

[0020] The length of the third rectangular open-ring resonator is 13.2 mm±0.1 mm, the opening length of the third rectangular open-ring resonator is 0.4 mm±0.01 mm, and the width of the third rectangular open-ring resonator is 0.2 mm±0.01 mm.

[0021] Furthermore, the distance between the first rectangular open-ring resonator and the microstrip feed line is 0.9 mm, and the distance between the third rectangular open-ring resonator and the microstrip feed line is 8.2 mm.

[0022] Furthermore, the distance between the first rectangular open-ring resonator and the lower edge of the dielectric substrate is 8.9 mm, and the distance between the second rectangular open-ring resonator and the lower edge of the dielectric substrate is 10.7 mm.

[0023] Furthermore, the arc-shaped open-loop resonator is an elliptical open-loop slot, the short axis of the arc-shaped open-loop resonator coincides with the first center line of the microstrip feeder, the first center line is parallel to the length direction of the microstrip feeder, the centers of the three arc-shaped open-loop resonators coincide, the short axis ratio and the long axis ratio of the three arc-shaped open-loop resonators are different, the three arc-shaped open-loop resonators form a three-in-one nest, the long axes of the three arc-shaped open-loop resonators coincide with the long axes, the short axes of the three arc-shaped open-loop resonators coincide with the short axes, the openings of the three arc-shaped open-loop slots are located on one side of the microstrip feeder, and the midpoints of the openings of the three arc-shaped open-loop slots are located on the first center line.

[0024] Furthermore, the radiation patch has a major axis length of 13.2 mm ± 0.1 mm and a minor axis length of 12 mm ± 0.1 mm;

[0025] The notch lengths of the three arc-shaped open-ring resonators are 2.5mm±0.1mm, 3.0mm±0.1mm and 4.0mm±0.1mm from the center of the radiation patch to the outside, the lengths of the three arc-shaped open-ring resonators are 27.78mm±0.1mm, 33.53mm±0.1mm and 46.76mm±0.1mm from the center of the radiation patch to the outside, and the widths of the three arc-shaped open-ring resonators are 0.35mm±0.01mm, 0.4mm±0.01mm and 0.35mm±0.01mm from the center of the radiation patch to the outside.

[0026] The beneficial effects of the present invention are as follows: compared with the prior art, the present invention sets the metal ground plane on the front side of the dielectric substrate, sets the first rectangular open-loop resonator symmetrically on both sides of the microstrip feeder, and the opening of the first rectangular open-loop resonator is located on the side of the first rectangular open-loop resonator away from the microstrip feeder, so that the notch frequency of the conformal antenna changes very little after the antenna is bent, and by setting the dielectric substrate as F4B, the flexibility of F4B is utilized to enable the dielectric substrate to be bent without damaging the antenna. The present invention has the characteristics of being able to bend and having a very small notch frequency change after bending, and is adapted to the stringent space requirements of portable devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a stereoscopic view of an embodiment 1 of the present invention;

[0028] Figure 2 This is a three-dimensional view of the embodiment 1 of the present invention after bending;

[0029] Figure 3 The antenna current distribution diagram at 2.62 GHz is simulated by HFSS15.0 software for implementation example 1 of the present invention;

[0030] Figure 4 The antenna current distribution diagram at 3.72 GHz is simulated by HFSS15.0 software for implementation example 1 of the present invention;

[0031] Figure 5 The antenna current distribution diagram at 4.48 GHz is simulated by HFSS15.0 software for implementation example 1 of the present invention;

[0032] Figure 6 The antenna current distribution diagram at 5.51 GHz is simulated by HFSS15.0 software for implementation example 1 of the present invention;

[0033] Figure 7 This is a return loss curve simulated by HFSS15.0 software when the embodiment 1 of the present invention is not bent;

[0034] Figure 8 This is a voltage standing wave ratio curve simulated by HFSS15.0 software when the embodiment 1 of the present invention is not bent;

[0035] Fig. 9 The return loss curves simulated by HFSS15.0 software when the bending diameters of Embodiment 1 of the present invention are 40 mm, 45 mm and 50 mm;

[0036] Fig.10 It is a stereoscopic view of Embodiment 2 of the present invention;

[0037] Fig.11 This is a three-dimensional view of Embodiment 2 of the present invention after bending;

[0038] Fig.12 The antenna current distribution diagram at 2.6 GHz is simulated by HFSS15.0 software for implementation example 2 of the present invention;

[0039] Fig.13 The antenna current distribution diagram at 3.75 GHz is simulated by HFSS15.0 software for implementation example 2 of the present invention;

[0040] Fig.14 The antenna current distribution diagram at 4.52 GHz is simulated by HFSS15.0 software for implementation example 2 of the present invention;

[0041] Fig.15 The antenna current distribution diagram at 5.48 GHz is simulated by HFSS15.0 software for implementation example 2 of the present invention;

[0042] Fig.16 The antenna current distribution diagram at 7.32 GHz is simulated by HFSS15.0 software for implementation example 2 of the present invention;

[0043] Fig.17 This is a return loss curve simulated by HFSS15.0 software when the embodiment 2 of the present invention is not bent;

[0044] Fig.18 This is a voltage standing wave ratio curve simulated by HFSS15.0 software when the embodiment 2 of the present invention is not bent;

[0045] Fig.19 The return loss curves of Embodiment 2 of the present invention when the bending diameters are 40 mm, 45 mm and 50 mm are simulated by HFSS15.0 software;

[0046] Fig. 20 It is a stereoscopic view of Embodiment 3 of the present invention;

[0047] Fig.21 This is a three-dimensional view of Embodiment 3 of the present invention after bending;

[0048] Fig. 22 The antenna current distribution diagram at 2.6 GHz is simulated by HFSS15.0 software for implementation example 3 of the present invention;

[0049] Fig.23 The antenna current distribution diagram at 3.75 GHz is simulated by HFSS15.0 software for implementation example 3 of the present invention;

[0050] Fig.24 The antenna current distribution diagram at 4.52 GHz is simulated by HFSS15.0 software for implementation example 3 of the present invention;

[0051] Fig.25 The antenna current distribution diagram at 5.48 GHz is simulated by HFSS15.0 software for implementation example 3 of the present invention;

[0052] Fig.26 The antenna current distribution diagram at 7.32 GHz is simulated by HFSS15.0 software for implementation example 3 of the present invention;

[0053] Fig. 27 The antenna current distribution diagram at 9.48 GHz is simulated by HFSS15.0 software for implementation example 3 of the present invention;

[0054] Fig.28 This is a return loss curve simulated by HFSS15.0 software when the embodiment 3 of the present invention is not bent;

[0055] Fig.29 This is a voltage standing wave ratio curve simulated by HFSS15.0 software when the embodiment 3 of the present invention is not bent;

[0056] Fig.30 This is a return loss curve simulated by HFSS15.0 software when the bending diameters of Embodiment 2 of the present invention are 40 mm, 45 mm and 50 mm. DETAILED DESCRIPTION

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] The embodiment of the present application uses a coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna to solve the problem that the notch antenna in the prior art cannot be bent during installation. Even if the shape of the existing notch antenna is bent, this will cause a huge change in the notch frequency of the notch antenna, making the notch antenna unusable. The bending of the notch antenna is achieved, and the notch frequency changes very little after bending.

[0059] The technical solution in the implementation example of this application is to solve the problem that the trap antenna cannot be bent during installation. Even if the shape of the existing trap antenna is bent, this will cause a huge change in the trap frequency of the trap antenna, making the trap antenna unusable. The overall idea is as follows:

[0060] A metal ground plane 6 is arranged on the front of a dielectric substrate 5, and first rectangular open-loop resonators 4 are symmetrically arranged on both sides of a microstrip feed line 7. The opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, so that the notch frequency of the conformal antenna changes very little after the antenna is bent, and by setting the dielectric substrate 5 to F4B, the flexibility of F4B is utilized to enable the dielectric substrate 5 to be bent without damaging the antenna. The present invention has the characteristics of being able to bend and having a very small notch frequency change after bending, and is adapted to the stringent space requirements of portable devices.

[0061] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0062] Implementation Example 1: Reference Figures 1 to 9 A coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna, comprising: a dielectric substrate 5; a metal ground plane 6; a radiation patch 1, wherein the radiation patch 1 is elliptical; an arc-shaped open-loop resonator 2, wherein the arc-shaped open-loop resonator 2 comprises three arc-shaped open-loop resonators 2, wherein the three arc-shaped open-loop resonators 2 are disposed in the radiation patch 1; a microstrip feed line 7, wherein the microstrip feed line 7 is disposed on the front of the dielectric substrate 5, and the microstrip feed line 7 is electrically connected to the radiation patch 1; wherein the dielectric substrate 5 is made of F4B, the metal ground plane 6 is disposed on the front of the dielectric substrate 5, and the metal ground plane 6 is rectangular, and the metal ground plane 6 includes two pieces, and the two metal ground planes 6 are symmetrically arranged on both sides of the microstrip feed line 7; the conformal antenna also includes: a first rectangular open-loop resonator 4, the first rectangular open-loop resonator 4 includes two, the first rectangular open-loop resonator 4 is a rectangular open-loop groove opened on the metal ground plane 6, the two first rectangular open-loop resonators 4 are symmetrically arranged on both sides of the microstrip feed line 7, the opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, and the side where the opening of the first rectangular open-loop resonator 4 is located is parallel to the length direction of the microstrip feed line 7.

[0063] The present invention arranges a metal ground plane 6 on the front of a dielectric substrate 5, and arranges first rectangular open-loop resonators 4 symmetrically on both sides of a microstrip feed line 7. The opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, so that the notch frequency of the conformal antenna changes very little after the antenna is bent, and by setting the dielectric substrate 5 to F4B, the flexibility of F4B is utilized to enable the dielectric substrate 5 to be bent without damaging the antenna. The present invention has the characteristics of being able to bend on the basis of realizing 4 notches and having a very small change in the notch frequency after bending, and is adapted to the stringent space requirements of portable devices.

[0064] When the antenna is bent as Figure 2 The cylinder shown, such as Fig. 9 As shown, the return loss curves of the 4-notch antenna show that the notch frequency changes very little when the diameter is 40mm, 45mm and 50mm.

[0065] Furthermore, the length of the first rectangular open-ring resonator 4 is 22.1 mm±0.1 mm, the opening length of the first rectangular open-ring resonator 4 is 0.7 mm±0.01 mm, and the width of the first rectangular open-ring resonator 4 is 0.2 mm±0.01 mm.

[0066] The 4-notch antenna can achieve the notch function of 5.51Hz under the condition of S11>-10db, while the characteristic of little change of notch frequency after bending is not affected.

[0067] Furthermore, the distance between the first rectangular open-ring resonator 4 and the microstrip feed line 7 is 0.9 mm.

[0068] This minimizes the change in notch frequency after the 4-notch antenna is bent.

[0069] Furthermore, the distance between the first rectangular open-ring resonator 4 and the lower edge of the dielectric substrate 5 is 8.9 mm.

[0070] Make sure that all notch frequencies satisfy S11>-10db.

[0071] Furthermore, the arc-shaped open-loop resonator 2 is an elliptical open-loop slot, the short axis of the arc-shaped open-loop resonator 2 coincides with the first center line of the microstrip feed line 7, the first center line is parallel to the length direction of the microstrip feed line 7, the centers of the three arc-shaped open-loop resonators 2 coincide, the short axis ratio and the long axis ratio of the three arc-shaped open-loop resonators 2 are different, the three arc-shaped open-loop resonators 2 form a three-in-one nest, the long axes of the three arc-shaped open-loop resonators 2 coincide with the long axes, the short axes of the three arc-shaped open-loop resonators 2 coincide with the short axes, the openings of the three arc-shaped open-loop slots are located on one side of the microstrip feed line 7, and the midpoints of the openings of the three arc-shaped open-loop slots are located on the first center line.

[0072] The coupling between the three arc-shaped open-ring resonators 2 is reduced, and the change of the overall notch frequency caused by defects in any arc-shaped open-ring resonator 2 due to manufacturing accuracy and other reasons is avoided, thereby reducing the manufacturing difficulty.

[0073] Furthermore, the major axis length of the radiation patch 1 is 13.2mm±0.1mm, and the minor axis length is 12mm±0.1mm; the notch lengths of the three arc-shaped open-ring resonators 2 are 2.5mm±0.1mm, 3.0mm±0.1mm and 4.0mm±0.1mm from the center of the radiation patch 1 to the outside, respectively; the lengths of the three arc-shaped open-ring resonators 2 are 27.78mm±0.1mm, 33.53mm±0.1mm and 46.76mm±0.1mm from the center of the radiation patch 1 to the outside, respectively; and the widths of the three arc-shaped open-ring resonators 2 are 0.35mm±0.01mm, 0.4mm±0.01mm and 0.35mm±0.01mm from the center of the radiation patch 1 to the outside.

[0074] The trap frequencies of the three arc-shaped open-ring resonators 2 of the four trap antennas are 4.48 GHz, 3.72 GHz and 2.62 GHz from the inside to the outside, and S11>-10 db is satisfied.

[0075] The return loss curve of this 4-notch antenna is shown by experiment Figure 7 And VSWR curve Figure 8 The display meets the requirements.

[0076] Implementation Example 2: Reference Figures 10 to 19 A coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna, comprising: a dielectric substrate 5; a metal ground plane 6; a radiation patch 1, wherein the radiation patch 1 is elliptical; an arc-shaped open-loop resonator 2, wherein the arc-shaped open-loop resonator 2 comprises three arc-shaped open-loop resonators 2, wherein the three arc-shaped open-loop resonators 2 are disposed in the radiation patch 1; a microstrip feed line 7, wherein the microstrip feed line 7 is disposed on the front of the dielectric substrate 5, and the microstrip feed line 7 is electrically connected to the radiation patch 1; wherein the dielectric substrate 5 is made of F4B, the metal ground plane 6 is disposed on the front of the dielectric substrate 5, and the metal ground plane 6 is rectangular, and the metal ground plane 6 includes two pieces, and the two metal ground planes 6 are symmetrically arranged on both sides of the microstrip feed line 7; the conformal antenna also includes: a first rectangular open-loop resonator 4, the first rectangular open-loop resonator 4 includes two, the first rectangular open-loop resonator 4 is a rectangular open-loop groove opened on the metal ground plane 6, the two first rectangular open-loop resonators 4 are symmetrically arranged on both sides of the microstrip feed line 7, the opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, and the side where the opening of the first rectangular open-loop resonator 4 is located is parallel to the length direction of the microstrip feed line 7.

[0077] The present invention arranges a metal ground plane 6 on the front of a dielectric substrate 5, and arranges first rectangular open-loop resonators 4 symmetrically on both sides of a microstrip feed line 7. The opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, so that the notch frequency of the conformal antenna changes very little after the antenna is bent, and by setting the dielectric substrate 5 to F4B, the flexibility of F4B is utilized to enable the dielectric substrate 5 to be bent without damaging the antenna. The present invention has the characteristics of being able to bend and having a very small notch frequency change after bending, and is adapted to the stringent space requirements of portable devices.

[0078] When the antenna is bent as Fig.11 The cylinder shown, such as Fig.19 As shown, the return loss curve of the notch antenna shows that the notch frequency changes very little when the diameter is 40mm, 45mm and 50mm.

[0079] Furthermore, it also includes: a second rectangular open-loop resonator 3, wherein the second rectangular open-loop resonator 3 includes two, the second rectangular open-loop resonator 3 is a rectangular open-loop groove opened on the metal ground surface 6, the two second rectangular open-loop resonators 3 are symmetrically arranged on both sides of the microstrip feed line 7, the opening of the second rectangular open-loop resonator 3 is located on the side of the second rectangular open-loop resonator 3 away from the microstrip feed line 7, the two second rectangular open-loop resonators 3 are respectively located in the first rectangular open-loop resonator 4 on the left and right sides, the side where the opening of the second rectangular open-loop resonator 3 is located is parallel to the length direction of the microstrip feed line 7, the second rectangular open-loop resonator 3 has the same upper and lower spacing as the first rectangular open-loop resonator 4, and the second rectangular open-loop resonator 3 has the same left and right spacing as the first rectangular open-loop resonator 4.

[0080] The antenna can achieve 5 notches while maintaining the characteristic of little change in notch frequency after bending.

[0081] Furthermore, the length of the first rectangular open-ring resonator 4 is 22.1mm±0.1mm, the opening length of the first rectangular open-ring resonator 4 is 0.7mm±0.01mm, and the width of the first rectangular open-ring resonator 4 is 0.2mm±0.01mm; the length of the second rectangular open-ring resonator 3 is 16.5mm±0.1mm, the opening length of the second rectangular open-ring resonator 3 is 0.7mm±0.01mm, and the width of the second rectangular open-ring resonator 3 is 0.2mm±0.01mm.

[0082] The 5-notch antenna can achieve the notch function of 5.48Hz and 7.32GHz under the condition of S11>-10db, while the characteristic of little change of notch frequency after bending is not affected.

[0083] Furthermore, the distance between the first rectangular open-ring resonator 4 and the microstrip feed line 7 is 0.9 mm.

[0084] This minimizes the change in notch frequency after the 5-notch antenna is bent.

[0085] Furthermore, the distance between the first rectangular open-ring resonator 4 and the lower edge of the dielectric substrate 5 is 8.9 mm.

[0086] Make sure that all notch frequencies satisfy S11>-10db.

[0087] Furthermore, the arc-shaped open-loop resonator 2 is an elliptical open-loop slot, the short axis of the arc-shaped open-loop resonator 2 coincides with the first center line of the microstrip feed line 7, the first center line is parallel to the length direction of the microstrip feed line 7, the centers of the three arc-shaped open-loop resonators 2 coincide, the short axis ratio and the long axis ratio of the three arc-shaped open-loop resonators 2 are different, the three arc-shaped open-loop resonators 2 form a three-in-one nest, the long axes of the three arc-shaped open-loop resonators 2 coincide with the long axes, the short axes of the three arc-shaped open-loop resonators 2 coincide with the short axes, the openings of the three arc-shaped open-loop slots are located on one side of the microstrip feed line 7, and the midpoints of the openings of the three arc-shaped open-loop slots are located on the first center line.

[0088] The coupling between the three arc-shaped open-ring resonators 2 is reduced, and the change of the overall notch frequency caused by defects in any arc-shaped open-ring resonator 2 due to reasons such as manufacturing precision is avoided, thereby reducing the manufacturing difficulty.

[0089] Furthermore, the major axis length of the radiation patch 1 is 13.2mm±0.1mm, and the minor axis length is 12mm±0.1mm; the notch lengths of the three arc-shaped open-ring resonators 2 are 2.5mm±0.1mm, 3.0mm±0.1mm and 4.0mm±0.1mm from the center of the radiation patch 1 to the outside, respectively; the lengths of the three arc-shaped open-ring resonators 2 are 27.78mm±0.1mm, 33.53mm±0.1mm and 46.76mm±0.1mm from the center of the radiation patch 1 to the outside, respectively; and the widths of the three arc-shaped open-ring resonators 2 are 0.35mm±0.01mm, 0.4mm±0.01mm and 0.35mm±0.01mm from the center of the radiation patch 1 to the outside.

[0090] The notch frequencies of the three arc-shaped open-ring resonators 2 of the five-notch antenna are 4.52 GHz, 3.75 GHz and 2.6 GHz from the inside to the outside, and S11>-10 db is satisfied.

[0091] Return loss curve and VSWR curve Fig.17 and Fig.18 The display meets the requirements.

[0092] Implementation Example 3: Reference Figures 20 to 30A coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna, comprising: a dielectric substrate 5; a metal ground plane 6; a radiation patch 1, wherein the radiation patch 1 is elliptical; an arc-shaped open-loop resonator 2, wherein the arc-shaped open-loop resonator 2 comprises three arc-shaped open-loop resonators 2, wherein the three arc-shaped open-loop resonators 2 are disposed in the radiation patch 1; a microstrip feed line 7, wherein the microstrip feed line 7 is disposed on the front of the dielectric substrate 5, and the microstrip feed line 7 is electrically connected to the radiation patch 1; wherein the dielectric substrate 5 is made of F4B, the metal ground plane 6 is disposed on the front of the dielectric substrate 5, and the metal ground plane 6 is rectangular, and the metal ground plane 6 includes two pieces, and the two metal ground planes 6 are symmetrically arranged on both sides of the microstrip feed line 7; the conformal antenna also includes: a first rectangular open-loop resonator 4, the first rectangular open-loop resonator 4 includes two, the first rectangular open-loop resonator 4 is a rectangular open-loop groove opened on the metal ground plane 6, the two first rectangular open-loop resonators 4 are symmetrically arranged on both sides of the microstrip feed line 7, the opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, and the side where the opening of the first rectangular open-loop resonator 4 is located is parallel to the length direction of the microstrip feed line 7.

[0093] The present invention arranges a metal ground plane 6 on the front of a dielectric substrate 5, and arranges first rectangular open-loop resonators 4 symmetrically on both sides of a microstrip feed line 7. The opening of the first rectangular open-loop resonator 4 is located on the side of the first rectangular open-loop resonator 4 away from the microstrip feed line 7, so that the notch frequency of the conformal antenna changes very little after the antenna is bent, and by setting the dielectric substrate 5 to F4B, the flexibility of F4B is utilized to enable the dielectric substrate 5 to be bent without damaging the antenna. The present invention has the characteristics of being able to bend and having a very small notch frequency change after bending, and is adapted to the stringent space requirements of portable devices.

[0094] When the antenna is bent as Fig.21 The cylinder shown, such as Fig.30 As shown, the return loss curve of the notch antenna shows that the notch frequency changes very little when the diameter is 40mm, 45mm and 50mm.

[0095] Furthermore, it also includes: a second rectangular open-loop resonator 3, wherein the second rectangular open-loop resonator 3 includes two, the second rectangular open-loop resonator 3 is a rectangular open-loop groove opened on the metal ground surface 6, the two second rectangular open-loop resonators 3 are symmetrically arranged on both sides of the microstrip feed line 7, the opening of the second rectangular open-loop resonator 3 is located on the side of the second rectangular open-loop resonator 3 away from the microstrip feed line 7, the two second rectangular open-loop resonators 3 are respectively located in the first rectangular open-loop resonator 4 on the left and right sides, the side where the opening of the second rectangular open-loop resonator 3 is located is parallel to the length direction of the microstrip feed line 7, the second rectangular open-loop resonator 3 has the same upper and lower spacing as the first rectangular open-loop resonator 4, and the second rectangular open-loop resonator 3 has the same left and right spacing as the first rectangular open-loop resonator 4.

[0096] The antenna can achieve 5 notches while maintaining the characteristic of little change in notch frequency after bending.

[0097] Furthermore, it also includes: a third rectangular open-loop resonator 9, wherein the third rectangular open-loop resonator 9 includes two third rectangular open-loop resonators 9, which are rectangular open-loop grooves opened on the metal ground surface 6, and the two third rectangular open-loop resonators 9 are symmetrically arranged on both sides of the microstrip feed line 7, and the opening of the third rectangular open-loop resonator 9 is located on the side of the third rectangular open-loop resonator 9 away from the microstrip feed line 7, wherein one third rectangular open-loop resonator 9 is located on the left side of the first rectangular open-loop resonator 4 on the left side of the microstrip feed line 7, and the other third rectangular open-loop resonator 9 is located on the right side of the first rectangular open-loop resonator 4 on the right side of the microstrip feed line 7, and the side where the opening of the third rectangular open-loop resonator 9 is located is parallel to the length direction of the microstrip feed line 7.

[0098] The antenna can achieve 6 notches while maintaining the characteristic of little change in notch frequency after bending.

[0099] Furthermore, the length of the first rectangular open-ring resonator 4 is 22.1mm±0.1mm, the opening length of the first rectangular open-ring resonator 4 is 0.7mm±0.01mm, and the width of the first rectangular open-ring resonator 4 is 0.2mm±0.01mm; the length of the second rectangular open-ring resonator 3 is 16.5mm±0.1mm, the opening length of the second rectangular open-ring resonator 3 is 0.7mm±0.01mm, and the width of the second rectangular open-ring resonator 3 is 0.2mm±0.01mm; the length of the third rectangular open-ring resonator 9 is 13.2mm±0.1mm, the opening length of the third rectangular open-ring resonator 9 is 0.4mm±0.01mm, and the width of the second rectangular open-ring resonator 3 is 0.2mm±0.01mm.

[0100] The 6-notch antenna can achieve the notch function of 5.48 GHz, 7.32 GHz and 9.48 GHz under the condition of S11>-10 db, while the characteristic of little change of notch frequency after bending is not affected.

[0101] Furthermore, the distance between the first rectangular open-ring resonator 4 and the microstrip feed line 7 is 0.9 mm, and the distance between the third rectangular open-ring resonator 9 and the microstrip feed line 7 is 8.2 mm.

[0102] This minimizes the change in notch frequency after the 5-notch antenna is bent.

[0103] Furthermore, the distance between the first rectangular open-ring resonator 4 and the lower edge of the dielectric substrate 5 is 8.9 mm, and the distance between the third rectangular open-ring resonator 9 and the lower edge of the dielectric substrate 5 is 10.7 mm.

[0104] Make sure that all notch frequencies satisfy S11>-10db.

[0105] Furthermore, the arc-shaped open-loop resonator 2 is an elliptical open-loop slot, the short axis of the arc-shaped open-loop resonator 2 coincides with the first center line of the microstrip feed line 7, the first center line is parallel to the length direction of the microstrip feed line 7, the centers of the three arc-shaped open-loop resonators 2 coincide, the short axis ratio and the long axis ratio of the three arc-shaped open-loop resonators 2 are different, the three arc-shaped open-loop resonators 2 form a three-in-one nest, the long axes of the three arc-shaped open-loop resonators 2 coincide with the long axes, the short axes of the three arc-shaped open-loop resonators 2 coincide with the short axes, the openings of the three arc-shaped open-loop slots are located on one side of the microstrip feed line 7, and the midpoints of the openings of the three arc-shaped open-loop slots are located on the first center line.

[0106] The coupling between the three arc-shaped open-ring resonators 2 is reduced, and the change of the overall notch frequency caused by defects in any arc-shaped open-ring resonator 2 due to manufacturing accuracy and other reasons is avoided, thereby reducing the manufacturing difficulty.

[0107] Furthermore, the major axis length of the radiation patch 1 is 13.2mm±0.1mm, and the minor axis length is 12mm±0.1mm; the notch lengths of the three arc-shaped open-ring resonators 2 are 2.5mm±0.1mm, 3.0mm±0.1mm and 4.0mm±0.1mm from the center of the radiation patch 1 to the outside, respectively; the lengths of the three arc-shaped open-ring resonators 2 are 27.78mm±0.1mm, 33.53mm±0.1mm and 46.76mm±0.1mm from the center of the radiation patch 1 to the outside, respectively; and the widths of the three arc-shaped open-ring resonators 2 are 0.35mm±0.01mm, 0.4mm±0.01mm and 0.35mm±0.01mm from the center of the radiation patch 1 to the outside.

[0108] The trap frequencies of the three arc-shaped open-ring resonators 2 of the six-trap antenna are 4.52 GHz, 3.75 GHz and 2.6 GHz from the inside to the outside, and S11>-10 db is satisfied.

[0109] Return loss curve and VSWR curve Fig.28 and Fig.29 The display meets the requirements.

[0110] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna, comprising: A dielectric substrate (5); Metal ground plane (6); A radiation patch (1), wherein the radiation patch (1) is elliptical; Arc-shaped open-ring resonators (2), the arc-shaped open-ring resonators (2) comprising three arc-shaped open-ring resonators (2), and the three arc-shaped open-ring resonators (2) are opened in the radiation patch (1); A microstrip feed line (7), wherein the microstrip feed line (7) is arranged on the front side of the dielectric substrate (5), and the microstrip feed line (7) is electrically connected to the radiation patch (1); The invention is characterized in that the dielectric substrate (5) is made of F4B, the metal ground plane (6) is arranged on the front side of the dielectric substrate (5), the metal ground plane (6) is rectangular, the metal ground plane (6) comprises two pieces, and the two pieces of metal ground plane (6) are symmetrically arranged on both sides of the microstrip feed line (7); The conformal antenna further comprises: A first rectangular open-ring resonator (4), wherein the first rectangular open-ring resonator (4) comprises two first rectangular open-ring resonators (4), each of which is a rectangular open-ring slot opened on a metal ground plane (6), the two first rectangular open-ring resonators (4) being symmetrically arranged on both sides of a microstrip feed line (7), the opening of the first rectangular open-ring resonator (4) being located on a side of the first rectangular open-ring resonator (4) away from the microstrip feed line (7), and the side of the opening of the first rectangular open-ring resonator (4) being parallel to the length direction of the microstrip feed line (7); Also includes: A third rectangular open-ring resonator (9), wherein the third rectangular open-ring resonator (9) comprises two third rectangular open-ring resonators (9), each of which is a rectangular open-ring groove opened on the metal ground plane (6), and the two third rectangular open-ring resonators (9) are symmetrically arranged on both sides of the microstrip feed line (7), and the opening of the third rectangular open-ring resonator (9) is located on the side of the third rectangular open-ring resonator (9) away from the microstrip feed line (7), wherein one third rectangular open-ring resonator (9) is located on the left side of the first rectangular open-ring resonator (4) on the left side of the microstrip feed line (7), and the other third rectangular open-ring resonator (9) is located on the right side of the first rectangular open-ring resonator (4) on the right side of the microstrip feed line (7), and the side where the opening of the third rectangular open-ring resonator (9) is located is parallel to the length direction of the microstrip feed line (7); The second rectangular open-ring resonator (3) comprises two second rectangular open-ring resonators (3), each of which is a rectangular open-ring groove opened on a metal ground plane (6), the two second rectangular open-ring resonators (3) being symmetrically arranged on both sides of a microstrip feed line (7), the opening of the second rectangular open-ring resonator (3) being located on a side of the second rectangular open-ring resonator (3) away from the microstrip feed line (7), the two second rectangular open-ring resonators (3) being located in the first rectangular open-ring resonator (4) on the left and right sides respectively, the side where the opening of the second rectangular open-ring resonator (3) is located being parallel to the length direction of the microstrip feed line (7), the second rectangular open-ring resonator (3) and the first rectangular open-ring resonator (4) having the same vertical spacing, and the second rectangular open-ring resonator (3) and the first rectangular open-ring resonator (4) having the same horizontal spacing.

2. The coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna according to claim 1, characterized in that: The length of the first rectangular open-ring resonator (4) is 22.1 mm±0.1 mm, the opening length of the first rectangular open-ring resonator (4) is 0.7 mm±0.01 mm, and the width of the first rectangular open-ring resonator (4) is 0.2 mm±0.01 mm; The length of the second rectangular open-ring resonator (3) is 16.5 mm±0.1 mm, the opening length of the second rectangular open-ring resonator (3) is 0.7 mm±0.01 mm, and the width of the second rectangular open-ring resonator (3) is 0.2 mm±0.01 mm; The length of the third rectangular open-ring resonator (9) is 13.2 mm±0.1 mm, the opening length of the third rectangular open-ring resonator (9) is 0.4 mm±0.01 mm, and the width of the second rectangular open-ring resonator (3) is 0.2 mm±0.01 mm.

3. The coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna according to claim 2, characterized in that: The distance between the first rectangular open-ring resonator (4) and the microstrip feed line (7) is 0.9 mm, and the distance between the third rectangular open-ring resonator (9) and the microstrip feed line (7) is 8.2 mm.

4. The coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna according to claim 2, characterized in that: The distance between the first rectangular open-ring resonator (4) and the lower edge of the dielectric substrate (5) is 8.9 mm, and the distance between the third rectangular open-ring resonator (9) and the lower edge of the dielectric substrate (5) is 10.7 mm.

5. The coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna according to claim 1, characterized in that: The arc-shaped open-ring resonator (2) is an elliptical open-ring slot, the short axis of the arc-shaped open-ring resonator (2) coincides with the first center line of the microstrip feed line (7), the first center line is parallel to the length direction of the microstrip feed line (7), the centers of the three arc-shaped open-ring resonators (2) coincide, the short axis ratio and the long axis ratio of each of the three arc-shaped open-ring resonators (2) are different, the three arc-shaped open-ring resonators (2) form a three-layer nesting, the long axes of the three arc-shaped open-ring resonators (2) coincide with the long axes, the short axes of the three arc-shaped open-ring resonators (2) coincide with the short axes, the openings of the three arc-shaped open-ring slots are located on one side of the microstrip feed line (7), and the midpoints of the openings of the three arc-shaped open-ring slots are located on the first center line.

6. The coplanar waveguide-fed multi-notch ultra-wideband cylindrical conformal antenna according to claim 1, characterized in that: The radiation patch (1) has a major axis length of 13.2 mm ± 0.1 mm and a minor axis length of 12 mm ± 0.1 mm; The notch lengths of the three arc-shaped open-ring resonators (2) are 2.5 mm ± 0.1 mm, 3.0 mm ± 0.1 mm and 4.0 mm ± 0.1 mm, respectively, from the center of the radiation patch (1) to the outside; the lengths of the three arc-shaped open-ring resonators (2) are 27.78 mm ± 0.1 mm, 33.53 mm ± 0.1 mm and 46.76 mm ± 0.1 mm, respectively, from the center of the radiation patch (1) to the outside; and the widths of the three arc-shaped open-ring resonators (2) are 0.35 mm ± 0.01 mm, 0.4 mm ± 0.01 mm and 0.35 mm ± 0.01 mm, respectively, from the center of the radiation patch (1) to the outside.

Images