CN109037924B - H-shaped feed source terminal double-frequency planar slot antenna loaded with slot ring - Google Patents
H-shaped feed source terminal double-frequency planar slot antenna loaded with slot ring Download PDFInfo
- Publication number
- CN109037924B CN109037924B CN201810704012.0A CN201810704012A CN109037924B CN 109037924 B CN109037924 B CN 109037924B CN 201810704012 A CN201810704012 A CN 201810704012A CN 109037924 B CN109037924 B CN 109037924B
- Authority
- CN
- China
- Prior art keywords
- rectangular
- source terminal
- antenna
- width
- shaped feed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000004044 response Effects 0.000 claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 238000002955 isolation Methods 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 abstract description 13
- 230000005855 radiation Effects 0.000 abstract description 11
- 238000012545 processing Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The invention discloses a slot ring-loaded H-shaped feed source terminal dual-frequency planar slot antenna which consists of a medium substrate, a slot ring-loaded H-shaped feed source terminal printed on the medium substrate, a rectangular coplanar waveguide feeder, a rectangular wide slot floor and an external coaxial connector. Adjusting the size of the H-shaped feed terminal can improve the frequency response of the high frequency band of the antenna. The loading gap ring is introduced around the H-shaped feed source terminal, so that a certain resonance size can be obtained in a limited range, the size of the antenna is further reduced, the energy of the H-shaped feed source terminal can be coupled, and the frequency response of a low frequency range can be regulated. By adding rectangular protrusions above the rectangular wide slot floor, the antenna surface current path can be changed to increase the resonance point and provide good isolation between the frequency bands. The invention has the characteristics of double frequency bands, simple antenna structure, convenient processing and good radiation characteristic and gain characteristic of each frequency band, and is suitable for WiMAX and WLAN frequency band small-sized multi-band wireless communication systems.
Description
Technical Field
The invention relates to the technical field of wireless communication antennas, in particular to an H-shaped feed source terminal dual-frequency planar slot antenna loaded with a slot ring, which is suitable for WiMAX and WLAN frequency band small-sized multiband wireless communication systems.
Background
With the development of modern wireless communication systems toward miniaturization and system integration, limited spectrum resources have become a major contradiction limiting the development, and the problem of interference between various communication systems has become more and more prominent, so that an antenna needs to be designed to cover multiple frequency bands, thereby increasing the compatibility of the system, and multi-frequency antennas are generated in this context. The antenna can integrate the functions of a plurality of antennas and provide services for communication systems with different frequency bands, so that the size and the number of the antennas are reduced, the miniaturization and the integrated design of the wireless communication system are facilitated, and therefore, the multiband antenna has a very wide application prospect. The antenna section of the antenna feeding terminal and the antenna section of the different surface of the floor are relatively large, and the antenna feeding terminal and the antenna section of the coplanar surface of the floor are not suitable for miniaturized design of communication equipment, so that the antenna feeding terminal and the antenna section of the coplanar surface of the floor are focused on. The slot antenna is easy to realize multi-frequency characteristic and has good isolation, a wider slot is formed on the floor, a slot structure generally adopts an approximately rectangular or circular slot, radiation and feed structure are similar to a monopole antenna, the wide slot is combined with coplanar waveguide feed, a combination body adopting a special geometric structure can obtain wider impedance bandwidth, and multi-frequency or notch characteristics can be realized by loading resonance branches or introducing the special structure. The reasonable design of the feed unit can obtain wider impedance bandwidth, the slotting on the feed terminal can change the current distribution of the antenna surface, the resonance point in the frequency band range is increased, the additional patch with one quarter of the working wavelength is added around the feed terminal to generate reverse conditional resonance relation, and the bending type feed terminal can expand the antenna bandwidth and reduce the antenna volume. The introduction of a resonant structure on a feed terminal or a floor is the most direct method for realizing multi-frequency characteristics, and non-patent document 1 discloses a three-band dual-polarized planar monopole antenna with asymmetric ground and loading piles, wherein two inverted-L-shaped grooves are formed on the feed terminal, so that three different resonant branches are formed on the feed terminal, and multi-band characteristics are realized. Non-patent document 2 discloses a double rectangular loop planar printed antenna with an open terminal, which is formed by combining branches symmetrical on the left and right sides, wherein a single branch can excite an electric field with a specific frequency, the length of the resonant branch is reasonably adjusted, and the size of the open terminal position is controlled to generate specific frequency response, so that multiband characteristics are generated. The antennas have smart designs and novel structures, but the antennas are large in size or relatively narrow in bandwidth in each frequency band. In summary, the coplanar waveguide slot antenna has the advantages of small size, low profile, simple processing, easy conformal with the carrier, easy realization of multi-frequency characteristics, and the like, and has great application prospect and wide social requirements based on the development requirements of light weight and integration of the wireless communication system. The current integrated multi-function of communication devices has highlighted the need for multi-band antennas, which have become the most important part of the communication devices, and the design of miniaturized, low-cost multi-band antennas has become the trend and hot spot of current research.
List of citations
Non-patent document 1: tan Mingtao, broadband and multiband planar antenna research, university of electronic science and technology doctor's paper, 2016:76-85.
Non-patent document 2: li Bo, multiband/ultra wideband planar printed antennas and continuous tangential section antenna array studies, doctor's university of electronic technology, western An, university paper, 2013:31-35.
The invention aims to provide the H-shaped feed source terminal dual-frequency planar slot antenna loaded with the slot ring, which has the characteristics of dual frequency bands, good radiation characteristic, wide frequency band, small size, stable gain, convenient integration or conformal with a carrier, and can simultaneously meet the requirements of 3.5GHzWiMAX and 5GHz WLAN frequency bands on the working bandwidth.
The technical scheme of the invention is as follows: the utility model provides a loading gap ring's H shape feed terminal dual-frenquency planar slot antenna, comprises medium base plate (1), loading gap ring (2) printed on medium base plate (1), H shape feed terminal (3), rectangle coplanar waveguide feeder (4), rectangle wide gap floor (5) and external coaxial joint (6), its characterized in that:
a. The loading gap ring (2) is positioned around the H-shaped feed source terminal (3), a certain distance is kept between the loading gap ring and the outer edge of the H-shaped feed source terminal (3), the loading gap ring (2) is bent along the periphery of the H-shaped feed source terminal (3), energy is coupled through the H-shaped feed source terminal (3), the frequency response of a low frequency band can be adjusted, the loading gap ring (2) is introduced to obtain a certain resonance size in a limited range, the size of the antenna is further reduced, and the position and the size of the loading gap ring (2) are reasonably adjusted to generate specific frequency response, so that the multiband characteristic of the antenna is realized;
b. The H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the lower end of the middle rectangle is connected with the rectangular coplanar waveguide feeder line (4), the two sides of the middle rectangle are respectively connected with the left rectangle and the right rectangle, and the frequency response of the high frequency band of the antenna can be adjusted by adjusting the size of the H-shaped feed source terminal (3);
c. The rectangular coplanar waveguide feeder (4) is a section of rectangular conduction band with characteristic impedance of 50 omega, the upper end of the rectangular coplanar waveguide feeder (4) is connected with the central lower end of the H-shaped feed source terminal (3), the lower end of the rectangular coplanar waveguide feeder (4) is externally connected with the coaxial connector (6), the impedance matching of the antenna can be further adjusted by adjusting the width of the rectangular coplanar waveguide feeder (4), and the impedance bandwidth of the antenna is widened;
d. The rectangular wide gap floor (5) consists of a rectangular floor, left and right extension conduction bands, an upper side closed conduction band and an upper side rectangular bulge, wherein the rectangular floor, the left and right extension conduction bands and the upper side closed conduction band are combined to form a rectangular wide gap, the size of the rectangular floor can be adjusted to adjust the impedance matching of low frequency bands of the antenna, the rectangular bulge is added at the middle position above the rectangular wide gap floor (5), the current path of the surface of the antenna can be changed to increase resonance points, and good isolation is achieved between frequency bands;
e. The coaxial connector (6) is positioned on the central shaft at the lower end of the dielectric substrate (1), and the coaxial connector (6) is respectively connected with the two lower edges of the rectangular coplanar waveguide feeder line (4) and the rectangular wide gap floor (5).
The loading gap ring (2) is positioned around the H-shaped feed source terminal (3), the width a of a gap between the upper side of the loading gap ring (2) and the H-shaped feed source terminal (3) is 1 mm-2 mm, the width b of a gap between the rest of the loading gap ring (2) and the H-shaped feed source terminal (3) is 0.5 mm-0.7 mm, the length L 5 of the gap ring branch 7 is 3.4 mm-3.8 mm, the width W 5 of the gap ring branch 7 is 0.8 mm-1.2 mm, the length L 4 of the gap ring branch 8 is 0.8 mm-1.2 mm, the width W 4 of the gap ring branch 8 is 4.9 mm-5.5 mm, the length L 8 of the slit ring branch 9 is 9.5 mm-10.1 mm, the width W 6 of the slit ring branch 9 is 0.4 mm-0.8 mm, the length L 11 of the slit ring branch 10 is 0.8 mm-1.2 mm, the width W 10 of the slit ring branch 10 is 2.9 mm-3.3 mm, the length L 10 of the slit ring branch 11 is 2.8 mm-3.2 mm, the width W 11 of the slit ring branch 11 is 7.0 mm-7.4 mm, the distance L 2 between the lower end of the loading slit ring (2) and the lower end of the medium substrate is 11.5 mm-11.9 mm, and the distance W 3 between the inner side of the loading slit ring (2) and the edge of the rectangular coplanar waveguide feeder (4) is 1 mm-1.4 mm.
The H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the length L 7 of the left rectangle is 7.4-7.8 mm, the width W 9 of the left rectangle is 1.8-2.2 mm, the length L 6 of the middle rectangle is 1.8-2.2 mm, the width W 8×2+W2 of the middle rectangle is 8-8.4 mm, and the size of the right rectangle is the same as that of the left rectangle.
The length L 1 of a rectangular conduction band with characteristic impedance of 50 omega in the rectangular coplanar waveguide feeder line (4) is 15.8-16.4 mm, and the width W 2 is 2.4-2.8 mm.
The rectangular wide gap floor (5) consists of a rectangular floor, a left and right extending conduction band, an upper side closed conduction band and an upper side rectangular bulge, wherein the length L 3 of the rectangular floor is 8.9-9.5 mm, the width W 1 of the rectangular floor is 12.7-13.1 mm, the length L 9 of the left and right extending conduction band is 17.2-17.6 mm, the width W 7 of the left and right extending conduction band is 2.3-2.7 mm, the length L 12 of the upper side rectangular bulge is 2.8-3.2 mm, and the width W 12 of the upper side rectangular bulge is 13.5-14.5 mm.
The invention has the following effects: the invention designs the H-shaped feed source terminal with novel structure, and the frequency response of the high frequency band of the antenna can be improved by adjusting the size of the H-shaped feed source terminal. The loading slit ring is introduced around the H-shaped feed source terminal, so that the loading slit ring can be used in a limited range
The antenna has the advantages that a certain resonance size is obtained in a range, the size of the antenna is further reduced, the energy of the H-shaped feed source terminal can be coupled, the frequency response of a low frequency band is regulated, the position and the size of a loading gap ring are reasonably regulated, a specific frequency response can be generated, and the multiband characteristic of the antenna is realized. By adding rectangular protrusions above the rectangular wide slot floor, the antenna surface current path can be changed to increase the resonance point and provide good isolation between the frequency bands. The invention has the design size of 30mm multiplied by 30mm, has the characteristics of double frequency bands, the working frequency bands of 3.11 GHz-3.92 GHz and 4.81 GHz-6.25 GHz, has simple antenna structure and convenient processing, has good radiation characteristic and gain characteristic of each frequency band, and is suitable for WiMAX and WLAN frequency band small-sized multiband wireless communication systems.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Fig. 2 is an effect of the length L 5 of the slit loop stub 7 on the antenna reflection coefficient S 11.
Fig. 3 is an effect of the rectangular length L 7 on the left side of the H-shaped feed terminal on the antenna reflection coefficient S 11.
Fig. 4 shows the effect of the length L 12 and the width W 12 of the rectangular projection on the upper side of the rectangular wide slot floor on the antenna reflection coefficient S 11.
FIG. 5 is a graph showing the comparison of the measured reflectance S 11 curve with the simulation values according to the embodiment of the present invention.
Fig. 6 is an E-plane and H-plane radiation pattern at a frequency of 3.49GHz for an embodiment of the invention.
Fig. 7 is an E-plane and H-plane radiation pattern at a frequency of 5.55GHz for an embodiment of the invention.
Fig. 8 is a graph of peak gain at different frequency points according to an embodiment of the present invention.
Detailed Description
The specific embodiments of the invention are: as shown in fig. 1, an H-shaped feed source terminal dual-frequency planar slot antenna for loading slot loops is composed of a dielectric substrate (1), a loading slot loop (2) printed on the dielectric substrate (1), an H-shaped feed source terminal (3), a rectangular coplanar waveguide feeder (4), a rectangular wide slot floor (5) and an external coaxial connector (6), and is characterized in that: the loading gap ring (2) is positioned around the H-shaped feed source terminal (3), a certain distance is kept between the loading gap ring and the outer edge of the H-shaped feed source terminal (3), the loading gap ring (2) is bent along the periphery of the H-shaped feed source terminal (3), energy is coupled through the H-shaped feed source terminal (3), the frequency response of a low frequency band can be adjusted, a certain resonance size can be obtained in a limited range by introducing the loading gap ring (2), the size of the antenna is further reduced, and the position and the size of the loading gap ring (2) are reasonably adjusted to generate specific frequency response, so that the multiband characteristic of the antenna is realized; the H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the lower end of the middle rectangle is connected with the rectangular coplanar waveguide feeder line (4), the two sides of the middle rectangle are respectively connected with the left rectangle and the right rectangle, and the frequency response of the high frequency band of the antenna can be adjusted by adjusting the size of the H-shaped feed source terminal (3); the rectangular coplanar waveguide feeder (4) is a section of rectangular conduction band with characteristic impedance of 50 omega, the upper end of the rectangular coplanar waveguide feeder (4) is connected with the central lower end of the H-shaped feed source terminal (3), the lower end of the rectangular coplanar waveguide feeder (4) is externally connected with the coaxial connector (6), the impedance matching of the antenna can be further adjusted by adjusting the width of the rectangular coplanar waveguide feeder (4), and the impedance bandwidth of the antenna is widened; the rectangular wide gap floor (5) consists of a rectangular floor, left and right extension conduction bands, an upper side closed conduction band and an upper side rectangular bulge, wherein the rectangular floor, the left and right extension conduction bands and the upper side closed conduction band are combined to form a rectangular wide gap, the size of the rectangular floor can be adjusted to adjust the impedance matching of low frequency bands of the antenna, the rectangular bulge is added at the middle position above the rectangular wide gap floor (5), the current path of the surface of the antenna can be changed to increase resonance points, and good isolation is achieved between frequency bands; the coaxial connector (6) is positioned on the central shaft at the lower end of the dielectric substrate (1), and the coaxial connector (6) is respectively connected with the two lower edges of the rectangular coplanar waveguide feeder line (4) and the rectangular wide gap floor (5).
The loading gap ring (2) is positioned around the H-shaped feed source terminal (3), the width a of a gap between the upper side of the loading gap ring (2) and the H-shaped feed source terminal (3) is 1 mm-2 mm, the width b of a gap between the rest of the loading gap ring (2) and the H-shaped feed source terminal (3) is 0.5 mm-0.7 mm, the length L 5 of the gap ring branch 7 is 3.4 mm-3.8 mm, the width W 5 of the gap ring branch 7 is 0.8 mm-1.2 mm, the length L 4 of the gap ring branch 8 is 0.8 mm-1.2 mm, the width W 4 of the gap ring branch 8 is 4.9 mm-5.5 mm, the length L 8 of the slit ring branch 9 is 9.5 mm-10.1 mm, the width W 6 of the slit ring branch 9 is 0.4 mm-0.8 mm, the length L 11 of the slit ring branch 10 is 0.8 mm-1.2 mm, the width W 10 of the slit ring branch 10 is 2.9 mm-3.3 mm, the length L 10 of the slit ring branch 11 is 2.8 mm-3.2 mm, the width W 11 of the slit ring branch 11 is 7.0 mm-7.4 mm, the distance L 2 between the lower end of the loading slit ring (2) and the lower end of the medium substrate is 11.5 mm-11.9 mm, and the distance W 3 between the inner side of the loading slit ring (2) and the edge of the rectangular coplanar waveguide feeder (4) is 1 mm-1.4 mm.
The H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the length L 7 of the left rectangle is 7.4-7.8 mm, the width W 9 of the left rectangle is 1.8-2.2 mm, the length L 6 of the middle rectangle is 1.8-2.2 mm, the width W 8×2+W2 of the middle rectangle is 8-8.4 mm, and the size of the right rectangle is the same as that of the left rectangle.
The length L 1 of a rectangular conduction band with characteristic impedance of 50 omega in the rectangular coplanar waveguide feeder line (4) is 15.8-16.4 mm, and the width W 2 is 2.4-2.8 mm.
The rectangular wide gap floor (5) consists of a rectangular floor, a left and right extending conduction band, an upper side closed conduction band and an upper side rectangular bulge, wherein the length L 3 of the rectangular floor is 8.9-9.5 mm, the width W 1 of the rectangular floor is 12.7-13.1 mm, the length L 9 of the left and right extending conduction band is 17.2-17.6 mm, the width W 7 of the left and right extending conduction band is 2.3-2.7 mm, the length L 12 of the upper side rectangular bulge is 2.8-3.2 mm, and the width W 12 of the upper side rectangular bulge is 13.5-14.5 mm.
Examples: the specific manufacturing process is as described in the embodiment mode. An FR4 epoxy resin dielectric substrate is selected, the dielectric constant epsilon r =4.4, the thickness h=1.6 mm, the thickness of a metal layer is 0.04mm, and a standard SMA connector is adopted for the coaxial connector. The length l=30 mm and the width w=30 mm of the dielectric substrate. The loading gap ring (2) can adjust the frequency response of a low frequency band by coupling energy through the H-shaped feed source terminal (3), the loading gap ring (2) is introduced to obtain a certain resonance size in a limited range, the volume of the antenna is further reduced, the position and the size of the loading gap ring (2) are reasonably adjusted to generate specific frequency response, the multiband characteristic of the antenna is realized, the width a of a gap between the upper side of the loading gap ring (2) and the H-shaped feed source terminal (3) is 0.9mm, the width b of a gap between the rest of the loading gap ring (2) and the H-shaped feed source terminal (3) is 0.6mm, the length L 5 of the slit ring branch 7 is 3.6mm, the width W 5 of the slit ring branch 7 is 1mm, the length L 4 of the slit ring branch 8 is 1mm, the width W 4 of the slit ring branch 8 is 5.2mm, the length L 8 of the slit ring branch 9 is 9.8mm, the width W 6 of the slit ring branch 9 is 0.6mm, the length L 11 of the slit ring branch 10 is 1mm, the width W 10 of the slit ring branch 10 is 3.1mm, the length L 10 of the slit ring branch 11 is 3mm, the width W 11 of the slit ring branch 11 is 7.2mm, the distance L 2 of the lower end of the loading slit ring (2) from the lower end of the medium substrate is 11.7mm, and the distance W 3 between the inner side of the loading slit ring (2) and the edge of the rectangular coplanar waveguide feeder (4) is 1.2mm. The H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the frequency response of the high frequency band of the antenna can be adjusted by adjusting the size of the H-shaped feed source terminal (3), the length L 7 of the left rectangle is 7.6mm, the width W 9 of the left rectangle is 2mm, the length L 6 of the middle rectangle is 2mm, the width W 8×2+W2 of the middle rectangle is 8.2mm, and the size of the right rectangle is the same as that of the left rectangle. The length L 1 of the rectangular coplanar waveguide feeder (4) is 16.1mm, and the width W 2 is 2.6mm. The rectangular wide gap floor (5) consists of a rectangular floor, left and right extension conduction bands, an upper side closed conduction band and an upper side rectangular bulge, the impedance matching of the low frequency band of the antenna can be adjusted by adjusting the size of the rectangular floor, the rectangular bulge is added at the middle position above the rectangular wide gap floor (5), the current path of the antenna surface can be changed, the resonance point is increased, good isolation is achieved between frequency bands, the length L 3 of the rectangular floor is 9.2mm, the width W 1 of the rectangular floor is 12.9mm, the length L 9 of the left and right extension conduction bands is 17.4mm, the width W 7 of the left and right extension conduction bands is 2.5mm, the length L 12 of the upper side rectangular bulge is 3mm, and the width W 12 of the upper side rectangular bulge is 14mm. The gap g between the rectangular wide gap floor (5) and the rectangular coplanar waveguide feeder (4) is 0.3mm.
The antenna model is analyzed by using HFSS software, the main parameters including the length L 5 of the slot ring branch 7, the length L 7 of the rectangle on the left side of the H-shaped feed source terminal, the length L 12 and the width W 12 of the rectangle bulge on the upper side of the wide slot floor are analyzed, and the impedance bandwidth of each frequency band is adjusted by adjusting the four parameters, so that the impedance matching characteristic is improved.
As shown in fig. 2, the three conditions of L 5＝3.4mm、L5 =3.6 mm and L 5 =3.8 mm are selected respectively to analyze the antenna, and as can be seen from fig. 2, the size of L 5 is adjusted to cause the overall size of the loading slot ring to change, so that the low-frequency band generates frequency response, along with the increase of L 5, the low-frequency band resonance point can be shifted towards the low-frequency direction, the resonance degree is deepened, the influence on the high-frequency band resonance degree and the bandwidth is small, because the loading slot ring can couple the energy of the H-shaped feed source terminal, at 3.5GHz, the surface current is strongly coupled between the loading slot ring and the H-shaped feed source terminal, the upper surface current of the loading slot ring is large, and the low-frequency band generates better frequency response. When the L 5 =3.6mm, the antenna can generate good impedance characteristics at 3.5GHz, the resonance point and the working bandwidth of the antenna are optimal, and the bandwidth of the antenna in a low frequency band meets the working requirement.
As shown in fig. 3, the three conditions of L 7＝7.4mm、L7 =7.6 mm and L 7 =7.8 mm are selected to analyze the antenna, and as L 7 increases, the high-frequency resonance point shifts to the high-frequency direction, the resonance degree is reduced, the bandwidth is also reduced, and the influence on the low-frequency resonance degree and the bandwidth is smaller, because at 5.5GHz, the surface current intensity of the H-shaped feed terminal is larger, the electrical dimension length of the H-shaped feed terminal corresponding to the high-frequency band is increased, and the influence on the matching frequency band bandwidth and the resonance degree of the antenna high-frequency band is larger, so that the high-end frequency band of 5.5GHz can be excited by adjusting the size of the H-shaped feed terminal. When the L 7 = 7.6mm, can make the antenna produce good impedance characteristic at 5.5GHz, make the performance and the bandwidth of antenna in the high frequency channel satisfy the design requirement.
As shown in fig. 4, the three conditions of L 12＝2.8mm、W12＝13.5mm、L12＝3mm、W12 =14 mm and L 12＝3.2mm、W12 =14.5 mm are selected to analyze the antenna, as the L 12、W12 increases, the low-frequency resonance point is shifted to the low-frequency direction, the resonance degree is reduced, the high-frequency resonance point is shifted to the high-frequency direction, the resonance degree is increased and then reduced, and the isolation degree of two working frequency bands is increased, because after the rectangular bulge is increased on the upper side of the wide gap floor, the surface current path of the antenna is changed, the surface current of the antenna is mainly concentrated at the lower edge of the rectangular bulge and the upper edge of the loading gap ring in the low-frequency band, the transverse electric dimension corresponding to the low-frequency band is increased due to the increase of the size of the rectangular bulge, so that the impedance bandwidth and resonance frequency of the antenna in the low-frequency band are improved, the surface current of the antenna is mainly concentrated at the lower edge of the rectangular bulge and near the terminal of the H-shaped feed source in the high-frequency band, and the dimensional change of the rectangular bulge also has a certain influence on the resonance frequency of the high-frequency band. When the L 12＝3mm、W12 = 14mm is selected, the frequency response of the antenna at the low end and the high end of 3.5GHz and 5.5GHz can be balanced, and the isolation between the two frequency bands is increased, so that the working bandwidth of each frequency band meets the design requirement.
From the comparative analysis, when the length L 5 = 3.6mm of the slit loop branch 7, the length L 7 = 7.6mm of the left rectangle of the H-shaped feed terminal, the length L 12 = 3mm of the rectangle bulge on the upper side of the floor, and the width W 12 = 14mm, the antenna has good reflection coefficient frequency bands.
A vector network analyzer is used for testing the reflection coefficient of an antenna, as shown in a graph of a change curve and simulation results of the reflection coefficient S11 along with frequency, for example, as shown in FIG. 5, an impedance bandwidth simulation result of which the reflection coefficient S 11 is smaller than-10 dB is 3.11 GHz-3.91 GHz in a low frequency band, 4.79 GHz-6.22 GHz in a high frequency band, 3.11 GHz-3.92 GHz in a low frequency band is obtained as a practical measurement result, the impedance bandwidth covers a WiMAX (3.3 GHz-3.7 GHz) frequency band, 4.81 GHz-6.25 GHz in a high frequency band, the impedance bandwidth covers a WLAN (5.15 GHz-5.825 GHz) frequency band, dual-band characteristics are generated, simulated resonance points are respectively located at 3.50GHz and 5.51GHz, corresponding resonance peak intensities are respectively-40.8 dB and-44.2 dB, practical measurement resonance points are respectively located at 3.49GHz and 5.55GHz, and corresponding resonance peak intensities are respectively-43.2 dB and-47.5 dB, and the working requirements of the antenna can be met. The consistency of the actual measurement result and the simulation result is good, the actual measurement and the simulation curve are basically consistent at a low frequency, a certain offset exists at a high frequency, and the main reasons for the offset are errors introduced by manually welding the coaxial joint and certain influence of the test environment on the measurement result.
The radiation patterns of the E face and the H face of the antenna at two frequency points of 3.49GHz and 5.55GHz are tested, the radiation characteristics of the antenna are tested, and the actual measured patterns are shown in fig. 6 and 7. As can be seen from the figure, the antenna radiation pattern is approximately 8-shaped on the E plane, is approximately omnidirectional on the H plane, and has slight deviation on the high-frequency range direction pattern, mainly because of the increase of frequency and the existence of a loading slot ring, the impedance of the rectangular coplanar waveguide feeder line is incompletely matched with the impedance of the antenna, and the radiation pattern is slightly deviated. The antenna has better omnidirectionality in two frequency bands, has stable radiation characteristic, and can simultaneously meet the requirements of WiMAX and WLAN frequency bands on a small-sized multi-band wireless communication system.
As shown in FIG. 8, several frequency points are randomly selected in the frequency band range of the test antenna, the peak gain variation range of the antenna is 3.3 dBi-4.2 dBi in the frequency band range of 3.11 GHz-3.92 GHz, the peak gain variation range is 4.5 dBi-5.3 dBi in the frequency band range of 4.81 GHz-6.25 GHz, the gain of the antenna is stable in the working frequency band, the peak gain is in an ascending trend along with the increase of the frequency, and the main reason is that the electric size corresponding to the antenna is also increased along with the increase of the frequency, so that the gain of the antenna is also increased, and the gain performance of the antenna in two frequency bands is good.
Claims (4)
1. The utility model provides a loading gap ring's H shape feed terminal dual-frenquency planar slot antenna, comprises medium base plate (1), loading gap ring (2) printed on medium base plate (1), H shape feed terminal (3), rectangle coplanar waveguide feeder (4), rectangle wide gap floor (5) and external coaxial joint (6), its characterized in that:
The loading gap ring (2) is positioned around the H-shaped feed source terminal (3), a certain distance is kept between the loading gap ring and the outer edge of the H-shaped feed source terminal (3), the loading gap ring (2) is bent along the periphery of the H-shaped feed source terminal (3), energy is coupled through the H-shaped feed source terminal (3), the frequency response of a low frequency band can be adjusted, a certain resonance size can be obtained in a limited range by introducing the loading gap ring (2), the size of the antenna is further reduced, and specific frequency response can be generated by reasonably adjusting the position and the size of the loading gap ring (2), so that the multiband characteristic of the antenna is realized;
The H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the lower end of the middle rectangle is connected with a rectangular coplanar waveguide feeder line (4), the two sides of the middle rectangle are respectively connected with the left rectangle and the right rectangle, and the frequency response of the high frequency band of the antenna can be adjusted by adjusting the size of the H-shaped feed source terminal (3);
the rectangular coplanar waveguide feeder (4) is a section of rectangular conduction band with characteristic impedance of 50 omega, the upper end of the rectangular coplanar waveguide feeder (4) is connected with the central lower end of the H-shaped feed source terminal (3), the lower end of the rectangular coplanar waveguide feeder (4) is externally connected with a coaxial connector (6), the impedance matching of the antenna can be further adjusted by adjusting the width of the rectangular coplanar waveguide feeder (4), and the impedance bandwidth of the antenna is widened;
The rectangular wide gap floor (5) consists of rectangular floors at two sides of a rectangular coplanar waveguide feeder (4), left and right extending conduction bands, an upper side closed conduction band and an upper side rectangular bulge, wherein the rectangular floors are respectively connected with the left and right extending conduction bands, the other ends of the left and right extending conduction bands are respectively connected with the upper side closed conduction band, and the middle position of the upper side closed conduction band is connected with the upper side rectangular bulge; the rectangular floor, the left-right extending conduction band and the upper closed conduction band are combined to form a rectangular wide gap, the size of the rectangular floor can be adjusted to adjust the impedance matching of the low frequency band of the antenna, a rectangular bulge is added at the middle position above the rectangular wide gap floor (5), the current path of the surface of the antenna can be changed to increase the resonance point, and the frequency bands have good isolation;
The coaxial connector (6) is positioned on the central shaft at the lower end of the dielectric substrate (1), and the coaxial connector (6) is respectively connected with the two lower edges of the rectangular coplanar waveguide feeder line (4) and the rectangular wide gap floor (5);
The loading gap ring (2) is positioned around the H-shaped feed source terminal (3), the width a of a gap between the upper side of the loading gap ring (2) and the H-shaped feed source terminal (3) is 1-2 mm, the width b of a gap between the rest of the loading gap ring (2) and the H-shaped feed source terminal (3) is 0.5-0.7 mm, the loading gap ring (2) is formed by sequentially connecting nine gap ring branches, the first gap ring branch is positioned between the rectangular and rectangular coplanar waveguide feeder (4) on the left side of the H-shaped feed source terminal (3), and the ninth gap ring branch is positioned between the rectangular and rectangular coplanar waveguide feeder (4) on the right side of the H-shaped feed source terminal (3); the length L 5 of the first gap ring branch (7) is 3.4 mm-3.8 mm, the width W 5 of the first gap ring branch (7) is 0.8 mm-1.2 mm, the length L 4 of the second gap ring branch (8) is 0.8 mm-1.2 mm, the width W 4 of the second gap ring branch (8) is 4.9 mm-5.5 mm, the length L 8 of the third gap ring branch (9) is 9.5 mm-10.1 mm, the width W 6 of the third gap ring branch (9) is 0.4 mm-0.8 mm, the width W 11 of the fourth gap ring branch (10) is 0.8 mm-1.2 mm, the width W 10 of the fourth gap ring branch (10) is 2.9 mm-3.3 mm, the length L 10 of the fifth gap ring branch (11) is 2.8 mm-3.2 mm, the width W 11 of the fifth gap ring branch (11) is 7.0 mm-7.4 mm, the width W 10 of the sixth slit ring branch is 2.9 mm-3.3 mm, the length L 11 of the sixth slit ring branch is 0.8 mm-1.2 mm, the length L 8 of the seventh slit ring branch is 9.5 mm-10.1 mm, the width W 6 of the seventh slit ring branch is 0.4 mm-0.8 mm, the length L 4 of the eighth slit ring branch is 0.8 mm-1.2 mm, the width W 4 of the eighth slit ring branch is 4.9 mm-5.5 mm, the length L 5 of the ninth slit ring branch is 3.4 mm-3.8 mm, the width W 5 of the ninth slit ring branch is 0.8 mm-1.2 mm, the distance L 2 of the lower end of the loading slit ring (2) from the lower end of the medium substrate is 11.5 mm-11.9 mm, and the distance W 3 between the inner side of the loading slit ring (2) and the edge of the rectangular coplanar waveguide feeder (4) is 1 mm-1.4 mm.
2. The dual-frequency planar slot antenna of the H-shaped feed source terminal loading the slot ring according to claim 1, wherein the H-shaped feed source terminal (3) is formed by combining three rectangular patches of a left rectangle, a middle rectangle and a right rectangle, the length L 7 of the left rectangle is 7.4 mm-7.8 mm, the width W 9 of the left rectangle is 1.8 mm-2.2 mm, the length L 6 of the middle rectangle is 1.8 mm-2.2 mm, the width of the middle rectangle is 8 mm-8.4 mm, and the size of the right rectangle is the same as that of the left rectangle.
3. The dual-frequency planar slot antenna of the H-shaped feed source terminal loaded with the slot ring according to claim 1, wherein the rectangular conduction band length L 1 with characteristic impedance of 50 omega in the rectangular coplanar waveguide feeder line (4) is 15.8 mm-16.4 mm, and the width W 2 is 2.4 mm-2.8 mm.
4. The dual-band planar slot antenna of an H-shaped feed source terminal loaded with a slot ring according to claim 1, wherein the length L 3 of the rectangular floor is 8.9 mm-9.5 mm, the width W 1 of the rectangular floor is 12.7 mm-13.1 mm, the length L 9 of the left and right extension conduction bands is 17.2 mm-17.6 mm, the width W 7 of the left and right extension conduction bands is 2.3 mm-2.7 mm, the length L 12 of the upper rectangular protrusion is 2.8 mm-3.2 mm, and the width W 12 of the upper rectangular protrusion is 13.5 mm-14.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810704012.0A CN109037924B (en) | 2018-07-01 | 2018-07-01 | H-shaped feed source terminal double-frequency planar slot antenna loaded with slot ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810704012.0A CN109037924B (en) | 2018-07-01 | 2018-07-01 | H-shaped feed source terminal double-frequency planar slot antenna loaded with slot ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109037924A CN109037924A (en) | 2018-12-18 |
| CN109037924B true CN109037924B (en) | 2024-04-26 |
Family
ID=65520996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810704012.0A Active CN109037924B (en) | 2018-07-01 | 2018-07-01 | H-shaped feed source terminal double-frequency planar slot antenna loaded with slot ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109037924B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768371A (en) * | 2019-03-12 | 2019-05-17 | 吉林医药学院 | The double frequency implanted antenna based on graphene for rehabilitation nursing device |
| CN114122679B (en) * | 2020-08-31 | 2023-01-24 | 西安电子科技大学 | Meander-loaded airborne knife-type antenna |
| CN113782973B (en) * | 2021-08-26 | 2022-08-23 | 西南交通大学 | Miniaturized dual-frequency antenna applied to UHF frequency band and loaded with ferrite medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986456A (en) * | 2010-11-05 | 2011-03-16 | 华南理工大学 | Ultra wide band filter with trap characteristics |
| CN102723601A (en) * | 2012-06-19 | 2012-10-10 | 北京航空航天大学 | Ultra-wide-band dual-notch paster antenna adopting wide-attenuation-band electromagnetic band gap structure |
| CN203434282U (en) * | 2013-09-04 | 2014-02-12 | 中国计量学院 | Rectangular ring H shape microstrip antenna |
| CN203434274U (en) * | 2013-09-04 | 2014-02-12 | 中国计量学院 | Synclastic-opening rectangular-ambulatory-plane three frequency microstrip antenna |
| CN104868237A (en) * | 2015-04-16 | 2015-08-26 | 厦门大学 | H-shaped symmetrical double dipole regulation slot coupled resonator multi-band antenna |
| CN106329145A (en) * | 2016-09-08 | 2017-01-11 | 哈尔滨工程大学 | OCSRR slot antenna based on microstrip line feed |
| CN208460974U (en) * | 2018-07-01 | 2019-02-01 | 吉林医药学院 | A kind of H-shaped feed terminal double frequency plane slot antenna loading gap ring |
-
2018
- 2018-07-01 CN CN201810704012.0A patent/CN109037924B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986456A (en) * | 2010-11-05 | 2011-03-16 | 华南理工大学 | Ultra wide band filter with trap characteristics |
| CN102723601A (en) * | 2012-06-19 | 2012-10-10 | 北京航空航天大学 | Ultra-wide-band dual-notch paster antenna adopting wide-attenuation-band electromagnetic band gap structure |
| CN203434282U (en) * | 2013-09-04 | 2014-02-12 | 中国计量学院 | Rectangular ring H shape microstrip antenna |
| CN203434274U (en) * | 2013-09-04 | 2014-02-12 | 中国计量学院 | Synclastic-opening rectangular-ambulatory-plane three frequency microstrip antenna |
| CN104868237A (en) * | 2015-04-16 | 2015-08-26 | 厦门大学 | H-shaped symmetrical double dipole regulation slot coupled resonator multi-band antenna |
| CN106329145A (en) * | 2016-09-08 | 2017-01-11 | 哈尔滨工程大学 | OCSRR slot antenna based on microstrip line feed |
| CN208460974U (en) * | 2018-07-01 | 2019-02-01 | 吉林医药学院 | A kind of H-shaped feed terminal double frequency plane slot antenna loading gap ring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109037924A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pan et al. | Wideband omnidirectional circularly polarized dielectric resonator antenna with parasitic strips | |
| Chu et al. | Design of compact dual-wideband antenna with assembled monopoles | |
| CN109216912B (en) | Flower-shaped feed source terminal multi-frequency microstrip antenna loaded with hexagonal ring parasitic branches | |
| Liu | Wideband dual-frequency double inverted-L CPW-fed monopole antenna for WLAN application | |
| Feng et al. | Wideband dual-frequency antenna with large frequency ratio | |
| CN108400439B (en) | W-shaped terminal dual-band dual-polarized planar slot antenna | |
| Xie et al. | Design of integrated duplexing and multi-band filtering slot antennas | |
| Kaur et al. | Novel dual-band multistrip monopole antenna with defected ground structure for WLAN/IMT/BLUETOOTH/WIMAX applications | |
| Yang et al. | Size reduction of omnidirectional cylindrical dielectric resonator antenna using a magnetic aperture source | |
| CN108832287B (en) | Three-frequency-band WiFi antenna | |
| CN109037924B (en) | H-shaped feed source terminal double-frequency planar slot antenna loaded with slot ring | |
| CN208460974U (en) | A kind of H-shaped feed terminal double frequency plane slot antenna loading gap ring | |
| CN109088164B (en) | Gear ring gap double-frequency circularly polarized antenna | |
| Tze-Meng et al. | A dual-band omni-directional microstrip antenna | |
| CN109193136B (en) | High-gain patch antenna with broadband and filtering characteristics | |
| Liu et al. | Compact CPW-fed multiband antenna for TD-LTE/WLAN/WiMAX applications | |
| CN108390152B (en) | Elliptical ring combined three-broadband planar slot antenna | |
| CN108110427B (en) | Dual-broadband planar slot antenna for butterfly terminal | |
| CN207834578U (en) | A kind of double band planar slot antennas of butterfly terminal | |
| Yahya et al. | A crescent-shaped monopole MIMO antennas with improved isolation for dual-band WLAN applications | |
| Wang et al. | Small-size CPW-fed Quasi-Yagi antenna with round-ended bow-tie CPW-to-slotline transition | |
| Baghel et al. | Design of a Substrate Integrated Coaxial Line Based $2\text {x} 4$ Slot Antenna Array for Millimeter Wave Application | |
| Yeo et al. | Broadband series-fed dipole pair antenna with parasitic strip pair director | |
| Li et al. | Design of tri-band quasi-self-complementary antenna for WLAN and WIMAX applications | |
| Saha et al. | A CPW-fed trapezoidal shape wideband antenna with partial ground for WLAN and WiMAX applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ou Renxia Inventor after: Zhang Hualei Inventor after: Bao Jie Inventor after: Chen Hongbin Inventor after: Zhang Guanglei Inventor after: Zhu Ying Inventor before: Zhu Ying Inventor before: Ou Renxia Inventor before: Zhang Hualei Inventor before: Bao Jie Inventor before: Chen Hongbin Inventor before: Zhang Guanglei |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |