CN109980353B - Multi-notch frequency band ultra-wideband planar antenna - Google Patents
Multi-notch frequency band ultra-wideband planar antenna Download PDFInfo
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- CN109980353B CN109980353B CN201910191842.2A CN201910191842A CN109980353B CN 109980353 B CN109980353 B CN 109980353B CN 201910191842 A CN201910191842 A CN 201910191842A CN 109980353 B CN109980353 B CN 109980353B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
Abstract
The invention discloses a multi-notch frequency band ultra-wideband planar antenna, which comprises an ultra-wideband monopole antenna and a parasitic resonator, wherein the ultra-wideband monopole antenna comprises a radiator, a metal ground and a feeder line connected with the radiator, the parasitic resonator is arranged on the side part of the feeder line and is coupled with the feeder line, and the parasitic resonator is provided with a first part which affects a first notch frequency band and a second part which affects a second notch frequency band and does not affect the first notch frequency band. Compared with the prior art, the invention can generate two notch frequency bands with adjustable notch frequency through one parasitic resonator, and has simple structure and easy manufacture.
Description
Technical Field
The invention relates to an antenna, in particular to a multi-notch frequency band ultra-wideband planar antenna.
Background
In a UWB communication system, communication in the frequency range of 3.1 to 10.6GHz will be considered. To date, various structures have been studied in order to realize ultra wideband antennas. However, in practical applications, the design of ultra wideband antennas still faces many challenges. One of the challenges is to avoid interfering with other existing narrowband services that already occupy the UWB band. In recent years, many ultra wideband antennas have attempted to overcome the interference problem with band reject function designs. The most popular antenna design methods with band reject function are embedded slots (C-slot, U-slot, square slot, arc slot), additional rods, U-rods, and slots in the radiator or floor plane. However, most designs only produce a single notch band.
"Design of a Dual Band-Notch UWB Slot Antenna by Means of Simple Parasitic Slits" published in Rezaul Azim, mohammad Tariqul Islam and Ahmed Toaha Mobashsher in 2013, by embedding one angular parasitic slot and two symmetrical parasitic slots, a dual notch frequency band of 3.35-3.8GHz and 5.12-5.84GHz respectively is achieved correspondingly.
In 2016 Nikitha Prem E.K and R Karthikeyan, "Triple Band Notch UWBAntenna Array with EBG Structure", a notch is introduced in satellite service frequency band [8-8.4GHz ] by etching an inverted U-shaped groove in the middle of the patch, and a complementary split ring resonator embedded in the ground structure near the feed edge suppresses the frequency of a specific frequency band [5.1-5.8GHz ], and a C-shaped groove closely placed with the inverted U-shaped groove suppresses WiMax [3.3-3.7GHz ].
In 2017 Weng YIk Sam, Z.Zakaria published "Design of A Dual-Notched Ultra-Wideband (UWB) Planar Antenna Using L-Shaped Bandstop Resonator", dual notch bands of 5.15-5.35GHz and 5.725-5.875GHz, respectively, are achieved by embedding two pairs of L-shaped resonators.
In 2018 Wasan h. Althubitat Al Amro, "Monopole Tri-Band Notched Characteristics UWB Antenna for WiMAX, C-Band, WLAN and X-Band Applications", published by Mohamed k. Abdelazeez, three slots are embedded in the antenna structure to create three notch bands, and one rectangular bar creates the first notch to reject WIMAX and the C-Band application frequency. Two other nested U-slots are etched into the patch to reject the WLAN band. Etching U slots in the feed line, the X band (aviation radio pilot frequency) is rejected.
Each of these structures in the prior art described above can only generate a notch band correspondingly. Thus, N resonators are required to implement an ultra wideband antenna with N notch bands. While the use of multiple resonators would increase the complexity of the antenna structure. This places additional constraints on the antenna design.
There is an urgent need for a new antenna that can solve the above problems.
Disclosure of Invention
The invention aims to provide a multi-notch frequency band ultra-wideband planar antenna, which can generate two notch frequency bands with adjustable notch frequencies through a parasitic resonator and simplify the antenna structure.
In order to achieve the above objects, the present invention discloses a multi-notch frequency band ultra-wideband planar antenna, comprising an ultra-wideband monopole antenna and a parasitic resonator, wherein the ultra-wideband monopole antenna comprises a radiator, a metal ground and a feeder line connected with the radiator, the parasitic resonator is arranged at the side part of the feeder line and is coupled with the feeder line, and the parasitic resonator has a first part affecting a first notch frequency band and a second part affecting a second notch frequency band and not affecting the first notch frequency band.
Compared with the prior art, the antenna structure has the advantages that the first notch frequency band can be adjusted through the first part, the second notch frequency band can be adjusted through the second part, and two notch frequency bands with adjustable notch frequencies are generated by using one parasitic resonator.
Preferably, the first notch frequency band is a high frequency band with a frequency higher than that of the second notch frequency band, the second notch frequency band is a low frequency band, the parasitic resonator comprises a first longitudinal resonant strip arranged on the side part of the feeder line and coupled with the feeder line, a public transverse resonant strip formed by bending and extending along the lower end of the first longitudinal resonant strip, and a second longitudinal resonant strip formed by bending and extending upwards from the middle position of the public transverse resonant strip, wherein the first longitudinal resonant strip forms a first part affecting the high frequency band and the low frequency band of the antenna, and the second longitudinal resonant strip forms a second part affecting the low frequency band and not affecting the high frequency band of the antenna. In the scheme, the first longitudinal resonant strip is arranged at the side part of the feeder line and is directly coupled with the feeder line, so that the first longitudinal resonant strip can directly influence the feeder line, no matter a low-frequency band or a high-frequency band, the surface current of the antenna is distributed on the first longitudinal resonant strip, so that the first longitudinal resonant strip forms all notch frequency bands influencing the ultra-wideband monopole antenna, namely the first longitudinal resonant strip forms a first part influencing the high-frequency band and the low-frequency band of the antenna; the second longitudinal resonant strip is formed by branching the middle of the public transverse resonant strip, and is far away from the feeder line relative to the first longitudinal resonant strip and is not arranged at the tail end of the second longitudinal resonant strip, in a high-frequency band part, the surface current of the antenna is little distributed on the second longitudinal resonant strip, and only in a low-frequency band part, the current is distributed on the second longitudinal resonant strip, so that the second longitudinal resonant strip mainly affects the frequency band of the low-frequency band part, the influence on the frequency band of the high-frequency band part is extremely small (the influence on the high frequency can be ignored), namely, the second longitudinal resonant strip forms a second part which affects the low-frequency band part and does not affect the high-frequency band part, and two notch frequencies can be controlled by using one parasitic resonator respectively.
More preferably, the first longitudinal resonant strip is adjacent to the feeder line in parallel at a certain interval, so that the second longitudinal resonant strip is far away from the feeder line relative to the first longitudinal resonant strip, and the influence of current on the second longitudinal resonant strip in a high-frequency band is further reduced.
More preferably, the second longitudinal resonant strip is parallel and opposite to the first longitudinal resonant strip with a certain interval.
More preferably, the second longitudinal resonant bar divides the public transverse resonant bar into a first transverse resonant bar adjacent to the first longitudinal resonant bar and a second transverse resonant bar far away from the first longitudinal resonant bar, and a third transverse resonant bar parallel and opposite to the second transverse resonant bar is outwards bent and extended at the upper end of the second longitudinal resonant bar. The third transverse resonator strip is used to adjust the wavelength of the antenna.
Specifically, the parasitic resonator further includes two third longitudinal resonant strips formed by bending and extending along the ends of the second transverse resonant strip and the third transverse resonant strip, and two fourth transverse resonant strips formed by bending and extending along the ends of the two third longitudinal resonant strips towards the second longitudinal resonant strip, wherein a gap with a first preset distance is formed between the two third longitudinal resonant strips, and the fourth transverse resonant strips and the gap form a capacitance part of the parasitic resonator. The third transverse resonance strip, the third longitudinal resonance strip and the fourth transverse resonance strip can be used for adjusting the wavelength of the antenna, and the parasitic resonator occupies a smaller volume; the capacitor part can concentrate current to the third longitudinal resonance strip relative to the low-frequency part at high frequency, so that the distribution of current to the second longitudinal resonance strip is reduced, the second longitudinal resonance strip is restrained from affecting the high-frequency part, the frequency bands of the high-frequency part and the low-frequency part can be adjusted through adjustment of the capacitor part, and the capacitor part forms the first part.
More preferably, the width of the first longitudinal resonant strip and the common transverse resonant strip is smaller than the width of the second longitudinal resonant strip.
More specifically, the length l1=7 mm of the first longitudinal resonant bar, the length l2=1.5 mm of the first transverse resonant bar, the length l3=6.2 mm of the second longitudinal resonant bar, the length l4=4 mm of the second transverse resonant bar and the third transverse resonant bar, the length l5=0.9 mm of the first preset distance, the length l6=1 mm of the fourth transverse resonant bar, the length l7=2.8 mm of the third longitudinal resonant bar, the width of the first transverse resonant bar, the width of the second longitudinal resonant bar, the width of the third longitudinal resonant bar and the width of the fourth transverse resonant bar are 5mm.
Preferably, the ultra-wideband monopole antenna further comprises a dielectric substrate, the radiator and the feeder line are arranged on the front surface of the dielectric substrate, the tail end of the feeder line extends to the bottom line of the dielectric substrate, and the metal ground is arranged on the back surface of the dielectric substrate.
Specifically, the metal ground consists of two square metal patches, and the two square metal patches are respectively opposite to the positions of two sides of the feeder line.
The radiator is circular, the radius of the radiator is 10mm, the center of the radiator is 25mm away from the bottom line of the dielectric substrate, the thickness of the dielectric substrate is 1.55mm, the dielectric constant is 4.3, the area is 40 mm multiplied by 36 mm, and the impedance of the feeder line is 50 ohms. The square metal patch has a length of 16.5 and mm and a width of 14 and mm.
The first longitudinal resonant bar is parallel to the feed line and is spaced 0.3mm from the feed line.
In order to achieve the above purpose, the invention also discloses a multi-notch frequency band ultra-wideband planar antenna, which comprises an ultra-wideband monopole antenna and a parasitic resonator, wherein the ultra-wideband monopole antenna comprises a radiator, a metal ground and a feeder line connected with the radiator, the parasitic resonator comprises a first longitudinal resonant strip arranged on the side part of the feeder line and coupled with the feeder line, a public transverse resonant strip formed by bending and extending along the lower end of the first longitudinal resonant strip, and a second longitudinal resonant strip formed by bending and extending upwards from the middle position of the public transverse resonant strip.
Compared with the prior art, the first longitudinal resonant strip is arranged on the side part of the feeder and is directly coupled with the feeder, so that the first longitudinal resonant strip can directly influence the feeder, the influence width of the first longitudinal resonant strip on the antenna frequency band is wide, a plurality of frequency bands on the antenna can be influenced, two frequency bands are called a low-frequency band and a high-frequency band, and the positions of two notches of the low-frequency band and the high-frequency band on the antenna can be influenced by adjusting the first longitudinal resonant strip. The second longitudinal resonant strip is formed by branching the middle of the public transverse resonant strip, compared with the first longitudinal resonant strip which is far away from the feeder line and is not arranged at the tail end of the second longitudinal resonant strip, the influence range of the frequency band is small, the frequency band position is low, the frequency band at the low frequency band is mainly influenced by adjusting the second longitudinal resonant strip, the influence of the frequency band at the high frequency band is extremely small (the influence of the second longitudinal resonant strip on the high frequency is negligible), so that the notch position of the low frequency band is independently adjusted through the second longitudinal resonant strip, and the notch frequencies of the two notch frequency bands can be respectively controlled by using one parasitic resonator.
Preferably, the first longitudinal resonant strip is adjacent to the feed line in parallel at a distance.
Preferably, the second longitudinal resonant strip is parallel and opposite to the first longitudinal resonant strip at a certain interval.
Preferably, the second longitudinal resonant strip divides the public transverse resonant strip into a first transverse resonant strip adjacent to the first longitudinal resonant strip and a second transverse resonant strip far away from the first longitudinal resonant strip, and a third transverse resonant strip parallel and opposite to the second transverse resonant strip is outwards bent and extended at the upper end of the second longitudinal resonant strip.
More preferably, the parasitic resonator further includes two third longitudinal resonant strips formed by bending and extending along the ends of the second transverse resonant strip and the third transverse resonant strip, and two fourth transverse resonant strips formed by bending and extending along the ends of the two third longitudinal resonant strips toward the second longitudinal resonant strip, wherein a gap with a first preset distance is formed between the two third longitudinal resonant strips, and the fourth transverse resonant strips and the gap form a capacitance part of the parasitic resonator. The third transverse resonance strip, the third longitudinal resonance strip and the fourth transverse resonance strip can be used for adjusting the wavelength of the antenna, and the parasitic resonator occupies a smaller volume; the capacitor part can concentrate current to the third longitudinal resonance strip relative to the low-frequency part at high frequency, so that the distribution of current to the second longitudinal resonance strip is reduced, the second longitudinal resonance strip is restrained from affecting the high-frequency part, and the frequency bands of the high-frequency part and the low-frequency part can be adjusted through adjustment of the capacitor part.
Preferably, the width of the first longitudinal resonant strip and the width of the common transverse resonant strip are smaller than the width of the second longitudinal resonant strip.
Preferably, the first longitudinal resonant strip is parallel to the feed line and spaced from the feed line by 0.3mm.
Drawings
Fig. 1a is a schematic diagram of the front structure of an ultra wideband planar antenna according to a first embodiment of the present invention.
Fig. 1b is a schematic diagram of the back structure of an ultra wideband planar antenna according to a first embodiment of the present invention.
Fig. 1c is a schematic structural diagram of a parasitic resonator in a first embodiment of the present invention.
Fig. 1d is another embodiment different from the first embodiment.
Fig. 2a is a schematic diagram of a front structure of an ultra wideband planar antenna according to a second embodiment of the present invention.
Fig. 2b is a schematic structural diagram of a parasitic resonator in a second embodiment of the present invention.
Fig. 3a is a schematic diagram of a front structure of an ultra wideband planar antenna according to a third embodiment of the present invention.
Fig. 3b is a schematic structural diagram of a parasitic resonator in a third embodiment of the present invention.
Fig. 4 is a schematic diagram of a front structure of an ultra wideband planar antenna according to a fourth embodiment of the present invention.
Fig. 5 is a schematic diagram of a back structure of an ultra wideband planar antenna according to a fourth embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a parasitic resonator in a fourth embodiment of the present invention.
Fig. 7 is a graph showing the change in the reflection coefficient of the antenna with frequency without loading the parasitic resonator in the fourth embodiment.
Fig. 8 is a graph showing the change in the reflection coefficient of the antenna with frequency in the case of loading the parasitic resonator in the fourth embodiment.
Fig. 9 is a graph showing the simulated reflection coefficient of the antenna as a function of frequency when the L1 length is optimized in the fourth embodiment.
Fig. 10 is a graph showing the simulated reflection coefficient of the antenna as a function of frequency when the L6 length is optimized in the fourth embodiment.
Fig. 11 is a graph showing the simulated reflection coefficient of the antenna as a function of frequency when the L3 length is optimized in the fourth embodiment.
Fig. 12 is another embodiment of the present invention different from the fourth embodiment.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present invention in detail, the following description is made in connection with the embodiments and the accompanying drawings.
Referring to fig. 1a to 1c, the present invention discloses an ultra wideband planar antenna 100a with multiple notch frequency bands, comprising an ultra wideband monopole antenna 10 and a parasitic resonator 20a, wherein the ultra wideband monopole antenna 10 comprises a radiator 11, a metal ground 12 and a feeder line 13 connected with the radiator 11, the parasitic resonator 20a is arranged at the side of the feeder line 13 and is coupled with the feeder line 13, and the parasitic resonator 20a has a first part affecting a first notch frequency band and a second part affecting a second notch frequency band and not affecting the first notch frequency band. Wherein, the first notch frequency band and the second notch frequency band are both two notch frequency bands of the ultra-wideband planar antenna 100 a. The present invention achieves the effect of adjusting both notch bands by providing a unique portion (second portion) that affects the second notch band without affecting the first notch band, and affecting the first portion of the first notch band to adjust the positions of the first notch band and the second notch band, respectively, by one parasitic resonator 20 a. The second part will be referred to as the characteristic part hereinafter.
Wherein the parts of the parasitic resonator 20a affecting different notch frequency bands are determined by the structure of the parasitic resonator 20a and the distance of the position of the resonant stripe on the parasitic resonator 20a with respect to the feed line 13, thereby designing the required first part and second part.
In this embodiment, the first notch frequency band is a high frequency band, and the second notch frequency band is a low frequency band.
With continued reference to fig. 1a to 1c, the parasitic resonator 20a includes a first longitudinal resonant bar 211 disposed at a side portion of the feeder line 13 and coupled to the feeder line 13, a common transverse resonant bar formed by bending and extending along a lower end of the first longitudinal resonant bar 211, and a second longitudinal resonant bar 221 formed by bending and extending upward from a middle position of the common transverse resonant bar. The first longitudinal resonant bar 211 is coupled with the feed line 13 and forms a first portion affecting the low frequency band and affecting the high frequency band, and the second longitudinal resonant bar 221 is a branch extending from the middle of the common transverse resonant bar and forms a characteristic portion affecting the low frequency band and not affecting the high frequency band. Since the first portion affects both the high-frequency band and the low-frequency band in the present embodiment, the first portion is referred to as a common portion.
Referring to fig. 1c, the second longitudinal resonant stripe 221 divides the common transverse resonant stripe into a first transverse resonant stripe 212 and a second transverse resonant stripe 213. In this embodiment, the second longitudinal resonant bar 221 is adjacent to the first longitudinal resonant bar 211 at a junction of the common transverse resonant bar with respect to an end of the common transverse resonant bar. Wherein the common transverse resonator strip is joined to the ends of the first longitudinal resonator strip 211 also forming a common part affecting the low frequency band and affecting the high frequency band.
Wherein the second longitudinal resonance bar 221 is parallel and opposite to the first longitudinal resonance bar 211 with a certain interval.
In this embodiment, the width of the second longitudinal resonance bar 221 is wider than the width of the first longitudinal resonance bar 211. Specifically, the width of the second longitudinal resonant stripe 221 is also wider than the width of the common transverse resonant stripe. The width of the first longitudinal resonance bar 211 and the common transverse resonance bar is 3mm, and the width of the second longitudinal resonance bar 221 is 5mm. Of course, the width of the resonant strip can be set by a skilled person according to practical needs, and is not limited to the above values.
With continued reference to fig. 1a and 1b, the ultra-wideband monopole antenna 100 further includes a dielectric substrate 30, the radiator 11, the feeder line 13, and the parasitic resonator 20a are disposed on the front surface of the dielectric substrate 30, the end of the feeder line 13 extends to the bottom line of the dielectric substrate 30, and the metal ground 12 is disposed on the back surface of the dielectric substrate 30. The radiator 11 is circular, the radius of the radiator is 10mm, the center of the radiator is 25mm away from the bottom line of the dielectric substrate 30, the thickness of the dielectric substrate 30 is 1.55mm, the dielectric constant is 4.3, and the impedance of the feeder line is 50 ohms. In this embodiment, the dielectric substrate 30 is an FR4 material plate, and the dielectric substrate 30 is rectangular with an area of 40 mm ×36 mm. The metal ground 12 is composed of two square metal patches, and the two square metal patches are respectively opposite to the two sides of the feeder line 13. The square metal patch has a length of 16.5 and mm and a width of 14 and mm. Of course, the specific size and thickness of the antenna can be set by those skilled in the art according to actual needs, and are not limited to this scheme.
In this embodiment, the parasitic resonator 20a is parallel to the feed line 13 and spaced 0.3mm from the feed line 13. Specifically, the first longitudinal resonant strip 211 is parallel to said feed line 13 and is spaced from said feed line 13 by 0.3mm. The distance can be set by those skilled in the art according to actual needs and is not limited to this value.
In this embodiment, the parasitic resonator 20a is disposed on the right side of the feeder line 13, and of course, the parasitic resonator 20a may also be disposed on the left side of the feeder line 13 (as shown in fig. 1 d). Specifically, the parasitic resonator 20a is disposed forward on the side of the feeder line 13 (the upper end of the first longitudinal resonator strip 211 is disposed upward), and of course, the parasitic resonator 20a may be disposed upside down on the side of the feeder line 13 (the upper end of the first longitudinal resonator strip 211 is disposed downward).
In this embodiment, the parasitic resonator 20a is located below the radiator 11 and does not extend beyond the edges of the left and right sides of the radiator 11.
Referring to fig. 2a and 2b, which are second embodiments of the present invention, in the first embodiment, the parasitic resonator 20b of the ultra-wideband monopole antenna 10b further includes a third transverse resonant bar 222 bent along the upper end of the second longitudinal resonant bar 221 toward a side away from the feeder line 13 and located opposite to the second transverse resonant bar 213, and the common portion further includes the third transverse resonant bar 222. The third lateral resonance bar 222 has a length of 4mm, and the third lateral resonance bar 222 is a common portion. In the present embodiment, the length of the third lateral resonance bar 222 is equal to the length of the second lateral resonance bar 213.
Referring to fig. 3a and 3b, in a third embodiment of the present invention, based on the second embodiment, the parasitic resonator 20c of the ultra-wideband monopole antenna 10c further includes two third longitudinal resonant strips 223 formed by bending and extending the ends of the second transverse resonant strip 213 and the third transverse resonant strip 222, and a gap 225 with a first preset distance is provided between the two third longitudinal resonant strips 223. The length l4=4 mm of the third transverse resonant bar 222, the width l5=0.9 mm of the gap 225, and the length l7=2.8 mm of the third longitudinal resonant bar 223. The third transverse resonant stripe 222, the gap 225 and the third longitudinal resonant stripe 223 are common parts.
Referring to fig. 4 to 6, which are a fourth embodiment of the present invention, according to a third embodiment, the parasitic resonator 20 of the ultra-wideband monopole antenna 100 further includes two fourth transverse resonant strips 224 formed by bending and extending along the ends of the two third longitudinal resonant strips 223 toward the second longitudinal resonant strip 213, respectively, wherein a gap 225 with a first preset distance is provided between the two third longitudinal resonant strips 223, and the fourth transverse resonant strips 224 and the gap 225 form a capacitance portion of the parasitic resonator 22. Specifically:
referring to fig. 4 to 6, the ultra wideband monopole antenna 100 includes a radiator 11, a metal ground 12 and a feed line 13, the parasitic resonator 20 includes a first longitudinal resonant strip 211 disposed at a side portion of the feed line 13 and coupled to the feed line 13, a common transverse resonant strip formed by bending and extending along a lower end of the first longitudinal resonant strip 211, a second longitudinal resonant strip 22 formed by bending and extending upward from a middle position of the common transverse resonant strip, a third transverse resonant strip 222 formed by bending and extending along an upper end of the second longitudinal resonant strip 221 toward a side away from the feed line 13, two third longitudinal resonant strips 223 formed by bending and extending along ends of the common transverse resonant strip and the third transverse resonant strip 222 relatively, and two fourth transverse resonant strips 224 formed by bending and extending along ends of the two third longitudinal resonant strips 223 toward the second longitudinal resonant strip 213 respectively, a gap 225 having a first predetermined distance between the two third longitudinal resonant strips 223, and a parasitic capacitor portion 22 formed by the fourth transverse resonant strip 224 and the gap 225. In this embodiment, the upper and lower ends of the second longitudinal resonant bar 221 extend outwards to form two hook-shaped bodies with a certain distance. The second longitudinal resonant bar 221 divides the common transverse resonant bar into a first transverse resonant bar 212 and a second transverse resonant bar 213, and the third transverse resonant bar 222 and the second transverse resonant bar 213 are parallel and opposite.
In this embodiment, the width of the second longitudinal resonance bar 221 is wider than the width of the first longitudinal resonance bar 211. Specifically, the width of the second longitudinal resonant stripe 221 is also wider than the width of the common transverse resonant stripe. The width of the first longitudinal resonance bar 211 and the common transverse resonance bar is 3mm, and the width of the second longitudinal resonance bar 221 is 5mm.
In this embodiment, the first longitudinal resonant stripe 211 is adjacent to the feed line 13 in parallel and is spaced from the feed line 13 by 0.3mm. In this embodiment, the parasitic resonator 20 is provided on the right side of the feeder line 13. The left side of the first longitudinal resonance bar 211 is disposed in parallel with the feed line 13 with a certain gap, and the right side is disposed in parallel with the second longitudinal resonance bar 221 with a certain gap. The right side of the second longitudinal resonance bar 221 is disposed opposite to the capacitance portion with a certain interval. Of course, the parasitic resonator 20 may be disposed on the right side of the feeder line. In the present embodiment, the parasitic resonator 20 is disposed forward on the side of the feeder line 13 (the upper end of the first longitudinal resonant bar 211 is disposed upward), but the parasitic resonator 20 may be disposed upside down on the side of the feeder line 13 (as shown in fig. 12).
Referring to fig. 4, the parasitic resonator 20 is located below the radiator 11 and does not protrude beyond the left and right edges of the radiator 11.
With continued reference to fig. 6, the length l1=7mm of the first longitudinal resonant stripe 211, the length l2=1.5 mm of the first transverse resonant stripe 212, the length l3=6.2 mm of the second longitudinal resonant stripe 221, the length l4=4 mm of the second transverse resonant stripe 213 and the third transverse resonant stripe 222, the width l5=0.9 mm of the gap 225, the length l6=1 mm of the fourth transverse resonant stripe 224, and the length l7=2.8 mm of the third longitudinal resonant stripe 223.
In the present embodiment, the second longitudinal resonance bar 221 forms a unique portion, and the first longitudinal resonance bar 211, the first lateral resonance bar 212, the second lateral resonance bar 213, the third lateral resonance bar 222, the gap 225, the fourth lateral resonance bar 224, and the third longitudinal resonance bar 223 form a common portion.
With the distance of this embodiment, the ultra-wideband monopole antenna 10 can satisfy an ultra-wideband monopole antenna of 3.1 to 10.6 GHz. Fig. 7 shows the reflection coefficient of the antenna as a function of frequency without the parasitic resonator 20 in this embodiment. Fig. 8 shows a plot of the reflection coefficient of the antenna 100 as a function of frequency for the case of loading the parasitic resonator 20 in this implementation. As can be seen from FIG. 8, the simulated return loss of the antenna 100 is higher than-10 dB in the frequency ranges of 3.68-4.22 GHz and 5.03-6.03 GHz, and satisfies the requirements of 3.7-4.2GHz of the downlink frequency of the C-band satellite and 5.15-5.825 GHz of the WLAN. Thus, with the parasitic resonator 20 loaded, the antenna 100 results in a dual notch band antenna that completely covers the C-band satellite downlink frequencies and the wireless local area network WLAN. In this embodiment, the antenna 100 is a dual notch band antenna.
When current is concentrated on the parasitic resonator 20, destructive interference of the excited state current of the proposed antenna occurs, which makes the antenna insensitive at notch frequencies. At 4GHz, a substantial portion of the current at 4GHz of the inventive antenna 100 is concentrated at the second longitudinal resonant strip 221 of the parasitic resonator 20, controlled by the characteristic portion. In this embodiment, the current is concentrated on the first longitudinal resonance bar 211, the first transverse resonance bar 212, the second longitudinal resonance bar 221, the third transverse resonance bar 222, the second transverse resonance bar 213, the third longitudinal resonance bar 223, and particularly on the third longitudinal resonance bar 223 at the upper end. The current at 5.5GHz is mainly concentrated in the common part, and the specific part has little influence on it. Wherein the current is concentrated on the first longitudinal resonance bar 211, the first transverse resonance bar 212, the third transverse resonance bar 222, the second transverse resonance bar 213, the third longitudinal resonance bar 223, in particular on the third longitudinal resonance bar 223 at the lower end. Therefore, the invention can realize the common movement of the two notch frequency bands by changing the common part, and can realize the independent movement of the notch frequency bands at the low frequency by changing the specific part.
Since the common portion of the parasitic resonator 20 has an effect on both notch bands created by the antenna, increasing the length of the common portion will shift both frequency centers of the antenna in the low frequency direction. The characteristic portion mainly affects the low frequency portion in the dual band generated by the antenna, and increasing the length of the characteristic portion causes the low frequency portion in the dual band generated by the antenna to move toward the low frequency portion, while having little effect on the frequency band of the high frequency portion.
Referring specifically to fig. 9 to 11, curves of simulated reflection coefficient of the antenna 100 as a function of frequency are shown when optimizing the length L1 of the first longitudinal resonant stripe 211, the length L6 of the fourth transverse resonant stripe 224, and the length L3 of the second longitudinal resonant stripe 221, respectively. As can be seen from fig. 9 and 10, when the length L1 of the first longitudinal resonant strip 211 and the length L6 of the fourth transverse resonant strip 224 are gradually increased, the two notch frequency bands of the antenna are simultaneously shifted toward the low frequency, and it is shown that the length L1 of the first longitudinal resonant strip 211 and the length L6 of the fourth transverse resonant strip 224 in the parasitic resonator 20 play a key role in adjusting the shift of the two notch frequency bands.
In fig. 11, when the length L3 of the second longitudinal resonance strip 221 is gradually increased, the low frequency part of the two notch frequency bands of the antenna is shifted toward the low frequency, while the notch frequency band of the high frequency part is substantially unchanged, showing that the length L3 of the second longitudinal resonance strip 221 in the parasitic resonator 20 plays a key role in adjusting the notch frequency band shift at the low frequency of the two notch frequency bands.
The above disclosed embodiments of adjusting the two notch frequency bands of the antenna using one parasitic resonator, it is of course possible to adjust the frequency bands of the antenna using a plurality of parasitic resonators, as long as one of the parasitic resonators is located at the side of the feeder line and has a common portion and a unique portion, so that both notch frequency bands can be adjusted to fall within the scope of the present invention. For example, two parasitic resonators are provided, one parasitic resonator is a parasitic resonator disclosed by the invention, two frequency bands of 3.68-4.22 GHz and 5.03-6.03 GHz can be adjusted, and the second parasitic resonator can be a common parasitic resonator and is used for adjusting the other frequency band. Of course, two parasitic resonators disclosed in the present invention may be provided to adjust four frequency bands, respectively.
In the description of the present invention, it should be understood that the terms "front", "back", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and are not to be construed as indicating that the indicated element or device is a specific orientation.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (4)
1. The utility model provides a many breach frequency bands ultra wide band planar antenna, includes ultra wide band monopole antenna, ultra wide band monopole antenna includes dielectric substrate, radiator, metal ground and the feeder that links to each other with the radiator, its characterized in that: the parasitic resonator is arranged at the side part of the feeder line and is coupled with the feeder line, and the parasitic resonator is provided with a first part which affects a first notch frequency band and a second part which affects a second notch frequency band and does not affect the first notch frequency band;
the parasitic resonator comprises a first longitudinal resonant strip, a public transverse resonant strip and a second longitudinal resonant strip, wherein the first longitudinal resonant strip is arranged on the side part of the feeder line and is coupled with the feeder line, the public transverse resonant strip is formed by bending and extending along the lower end of the first longitudinal resonant strip, the second longitudinal resonant strip is formed by bending and extending upwards from the middle position of the public transverse resonant strip, the first longitudinal resonant strip forms a first part which affects the high frequency band and the low frequency band, and the second longitudinal resonant strip forms a second part which affects the low frequency band and does not affect the high frequency band;
the first longitudinal resonant strip is adjacent to the feeder line in parallel at a certain interval;
the radiator, the feeder line and the metal belt are arranged on the dielectric substrate.
2. The multiple notch band ultra-wideband planar antenna of claim 1, wherein: the second longitudinal resonant strip is parallel and opposite to the first longitudinal resonant strip at a certain interval.
3. The multiple notch band ultra-wideband planar antenna of claim 1, wherein: the second longitudinal resonant strip divides the public transverse resonant strip into a first transverse resonant strip close to the first longitudinal resonant strip and a second transverse resonant strip far away from the first longitudinal resonant strip, the upper end of the second longitudinal resonant strip is outwards bent and extended to form a third transverse resonant strip parallel and opposite to the second transverse resonant strip, and the public transverse resonant strip and the third transverse resonant strip form the first part.
4. A multiple notch band ultra-wideband planar antenna as defined in claim 3, wherein: the parasitic resonator further comprises two third longitudinal resonant strips formed by bending and extending along the tail ends of the second transverse resonant strip and the third transverse resonant strip relatively, two fourth transverse resonant strips formed by bending and extending along the tail ends of the two third longitudinal resonant strips towards the second longitudinal resonant strip respectively, a gap with a first preset distance is formed between the two third longitudinal resonant strips, the fourth transverse resonant strips and the gap form a capacitance part of the parasitic resonator, and the fourth transverse resonant strips, the third longitudinal resonant strips and the gap form the first part.
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