CN110165395B - Miniaturized compact three-frequency-band antenna - Google Patents
Miniaturized compact three-frequency-band antenna Download PDFInfo
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- CN110165395B CN110165395B CN201910383094.8A CN201910383094A CN110165395B CN 110165395 B CN110165395 B CN 110165395B CN 201910383094 A CN201910383094 A CN 201910383094A CN 110165395 B CN110165395 B CN 110165395B
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- dielectric substrate
- monopole
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- microstrip
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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
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/206—Microstrip transmission line antennas
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- 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
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- 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 miniaturized compact three-band antenna, and belongs to the technical field of antennas. The antenna comprises a rectangular dielectric substrate, three rectangular radiators and three microstrip lines which are arranged on the front surface of the dielectric substrate, an annular radiator and three open-circuit lines which are arranged on the back surface of the dielectric substrate. The antenna is excited by the microstrip line, three monopoles with the same shape and electromagnetic property and an improved annular structure are adopted for radiation, an open-circuit line and the microstrip line are loaded on the upper surface and the lower surface of a dielectric substrate, and good impedance matching can be realized by adjusting the lengths of the open-circuit line and the microstrip line. The invention can effectively solve the problem of narrow bandwidth of the existing electrically small antenna, and has the advantages of compact structure, high bandwidth and the like.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a miniaturized compact type tri-band patch antenna with an electrical small characteristic.
Background
Wireless communication technology is one of the fastest growing fields in the present generation, and the technologies have been applied to systems such as bluetooth headsets, portable computers, Beidou positioning and safety sensors. With the development of economy, the demand for these wireless communication devices has increased. Because of the advantages of easy carrying, simple installation, small size and the like, the miniaturized equipment is favored by people in the fields of daily office, household and the like. Antennas are an essential part of wireless systems and are receiving attention from designers of miniaturized systems. Meanwhile, modern office and household equipment are more and more in variety and more widely used, so that the requirement on a wireless system is higher and higher. Engineers divide the frequency spectrum into multiple segments for meeting the requirements of different functions of the wireless system. With the emergence of integrated intelligent household and office equipment, the demand of multifunctional wireless communication technology is increasing. Therefore, it is desirable to design a small and compact multifunctional antenna to meet the requirement of a multifunctional and small wireless communication system.
Yaohui Yang published an article of Compact Multimode Monopole Antenna for Metal-weighted Mobile Phones in IEEE TRANSACTIONS ANTENNAS AND PROPATION, and the article adopts Monopole loaded ON the frame mode of the Antenna to realize a dual-band Antenna, and the Antenna has an excellent-6 dB impedance bandwidth, but the-10 dB impedance bandwidth of the Antenna is narrow, and the return loss of the Antenna is large.
Ahmad A. Salih published an article by IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS, "A Dual-Band high minimum Patch Antenna," which implements a Dual-Band Antenna with a defected ground structure, which has a low-frequency resonance point of 2.43GHz and only has an impedance bandwidth of-6 dB of 40 MHz.
Disclosure of Invention
The invention provides a miniaturized compact three-band antenna with electrically small characteristics, which is excited by a microstrip line, adopts three monopoles with the same shape and electromagnetic characteristics and an improved annular structure for radiation, loads the microstrip line and an open circuit line on the upper and lower surfaces of a dielectric substrate, and can realize better impedance matching by adjusting the lengths of the microstrip line and the open circuit line. The invention can effectively solve the problem of narrow bandwidth of the existing electrically small antenna, and has the advantages of compact structure, high bandwidth and the like.
The invention is realized by the following technical scheme:
a miniaturized compact three-band antenna comprises a rectangular dielectric substrate (11), three rectangular radiators (4, 5 and 6) and three microstrip lines (1, 2 and 3) which are arranged on the front surface of the dielectric substrate, an annular radiator (7) and three open lines (8, 9 and 10) which are arranged on the back surface of the dielectric substrate.
The three rectangular radiators are a first monopole, a second monopole and a third monopole which are the same in size, the first monopole and the second monopole are arranged on the lower half portion of the dielectric substrate in parallel, the third monopole is arranged on the upper left portion of the dielectric substrate, and the three monopoles are the same in side distance with the dielectric substrate.
The microstrip lines comprise a first microstrip line (1), a second microstrip line (2) and a third microstrip line (3), one ends of the three microstrip lines are all positioned at the edge of the dielectric substrate, and the other ends of the three microstrip lines are respectively connected with the rectangular radiator; the first microstrip line is used as a microstrip feeder line to feed the antenna.
The annular radiator is a rectangular metal ring, and the outer side of the annular radiator is superposed with the edge of the dielectric substrate.
Furthermore, the back of the dielectric substrate is also provided with three rectangular open lines connected with the annular radiator, wherein the first open line is arranged between the projections of the first monopole and the second monopole, the second open line is arranged between the projections of the second monopole and the third monopole, and the third open line is arranged on one side of the third monopole.
Further, the dielectric substrate is a square dielectric substrate, and the rectangular radiator is a square radiator.
The antenna of the invention firstly selects a loop antenna as a low-frequency radiation unit; secondly, the three square high-frequency radiating units are placed specially to reduce the low-frequency working frequency, so that the miniaturization of the antenna is realized; and finally, exciting a high-order mode of the loop antenna by using a microstrip line loading method to realize intermediate-frequency radiation.
Compared with the prior art, the invention has the following advantages:
1. compared with the existing patch antenna, the invention can simultaneously realize the advantages of miniaturization, compact structure, multiband and the like. The invention belongs to the traditional patch antenna, and has an electrically small size, so that the patch antenna is suitable for low-cost large-scale production and is very suitable for small-sized mobile equipment.
2. Compared with the traditional miniaturized multiband antenna, the compact miniaturized antenna designed by the invention not only ensures that the antenna does not need to be externally connected with a larger metal floor, but also has obvious advantages in the aspects of the number of covered frequency bands, the width of each frequency band and low cost.
3. In the invention, under the condition that the annular radiator is fixed, the monopole structure is added, so that the working frequency range of low frequency is reduced, and the miniaturization is further realized.
4. According to the invention, the microstrip line is loaded on the upper surface of the antenna, so that the electrical characteristics of the annular radiator are changed, and the high-order mode of the annular radiator is excited. The microstrip line is loaded on the upper surface of the antenna, so that new resonance points can be generated, and the working range of the antenna is enlarged.
5. The compact three-band antenna of the invention has a small size, and the obtained working frequency of the antenna covers the frequency bands required by WLAN and WiMAX communication.
Drawings
Fig. 1 is a schematic diagram of an antenna structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a front structure of an antenna according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a backside structure of an antenna according to an embodiment of the present invention;
fig. 4 is a simulation curve of return loss of the antenna of the embodiment.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
As shown in fig. 1, the miniaturized and compact triple-band antenna proposed herein includes a square dielectric substrate (11), three square radiators (4, 5, 6) and three microstrip lines (1, 2, 3) disposed on the front surface of the dielectric substrate, an annular radiator (7) disposed on the back surface of the dielectric substrate, and three open lines (8, 9, 10). The square dielectric substrate (11) is made of FR4 material with the side length of 26.4mm, the dielectric constant of 4.6 and the thickness of 1 mm.
As shown in fig. 2, the three square radiators are a first monopole, a second monopole and a third monopole with the same size, and the side length is H2The size of the side of the antenna is 10.9mm, which determines the position of the high-frequency band resonance point of the antenna and the offset of the low-frequency resonance point.
The microstrip lines comprise a first microstrip line (1), a second microstrip line (2) and a third microstrip line (3), and the length of the microstrip lines is H11.8mm, width S11.92 mm. The first microstrip line (1) is used as a feeder line to feed the antenna, and the second microstrip line (2) and the third microstrip line (3) are related to the intermediate frequency of the antenna. As shown in FIG. 3, the annular radiator is a rectangular metal ring (7) with four sides W4＝1.8mm、W5＝1.8mm、L4＝1.8mm、L51.8mm, the size of which is related to the low frequency resonance point of the antenna.
The inside three rectangle open routes that still are connected with of annular irradiator, wherein first open route (8) set up between first, second monopole projection, and second open route (9) set up between second, third monopole projection, and third open route (10) set up in third monopole one side, and the size is respectively: l is1＝1mm，W1＝2.65mm；L2＝8mm，W2＝1mm；L3＝1mm，W3The length of which is 10mm, serves to adjust the position of the three frequency bands.
In practical application, as shown in fig. 1, a signal of the antenna is fed from the Port1 to obtain S where the second microstrip line, the third microstrip line, the first open path, the second open path, and the third open path are not loaded on the antenna11The curve is shown in figure 4, the return loss S of the antenna is in two frequency bands of 2.5-2.7GHz and 5.15-5.25GHz11Are all less than-10 dB.
S for loading second microstrip line, third microstrip line, first open route, second open route and third open route on antenna11As shown in FIG. 4, the return loss of the antenna is less than-10 dB in three frequency bands of 2.4-2.4835GHz, 3.5-3.7GHz and 5.725-5.825 GHz. By comparing the two curves in fig. 4, it can be found that the return loss S of the antenna loaded with the microstrip line and the open route at the resonance point11The antenna has smaller size and more frequency bands, which shows that the impedance matching of the antenna and the frequency band number are obviously improved by loading the microstrip line and the open circuit.
Claims (2)
1. A miniaturized compact three-band antenna comprises a rectangular dielectric substrate, three rectangular radiators and three microstrip lines which are arranged on the front surface of the dielectric substrate, an annular radiator and three open-circuit lines which are arranged on the back surface of the dielectric substrate;
the three rectangular radiators are a first monopole, a second monopole and a third monopole which are the same in size, the first monopole and the second monopole are arranged on the lower half part of the dielectric substrate in parallel, the third monopole is arranged on the upper left part of the dielectric substrate, and the three monopoles are the same in side distance with the dielectric substrate;
the microstrip lines comprise a first microstrip line, a second microstrip line and a third microstrip line, one ends of the three microstrip lines are all positioned at the edge of the dielectric substrate, and the other ends of the three microstrip lines are respectively connected with a rectangular radiator; the first microstrip line is used as a microstrip feeder line to feed the antenna;
the annular radiator is a rectangular metal ring, and the outer side of the annular radiator is superposed with the edge of the dielectric substrate;
the three open lines are rectangular open lines connected with the annular radiator, wherein the first open line is arranged between the projections of the first monopole and the second monopole, the second open line is arranged between the projections of the second monopole and the third monopole, and the third open line is arranged on one side of the third monopole.
2. A miniaturized, compact tri-band antenna, as claimed in claim 1, characterized in that: the dielectric substrate is a square dielectric substrate, and the rectangular radiator is a square radiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910383094.8A CN110165395B (en) | 2019-05-07 | 2019-05-07 | Miniaturized compact three-frequency-band antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910383094.8A CN110165395B (en) | 2019-05-07 | 2019-05-07 | Miniaturized compact three-frequency-band antenna |
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| CN110165395A CN110165395A (en) | 2019-08-23 |
| CN110165395B true CN110165395B (en) | 2020-12-29 |
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| CN113078462B (en) * | 2021-03-15 | 2022-10-11 | 电子科技大学 | Broadband electrically-adjustable parasitic unit antenna covering WLAN frequency band |
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| CN202444053U (en) * | 2012-01-17 | 2012-09-19 | 上海大亚科技有限公司 | Double-frequency paster antenna unit and radio frequency antenna system applied in wireless local area network |
| CN104466399B (en) * | 2013-09-22 | 2019-03-05 | 中兴通讯股份有限公司 | Method, the mobile terminal of a kind of microstrip antenna and its filtering interference signals |
| CN104269617B (en) * | 2014-09-19 | 2016-10-05 | 电子科技大学 | A kind of dual polarization UWB-MIMO antenna of plane |
| CN106329093A (en) * | 2015-06-17 | 2017-01-11 | 张家港市华正进出口贸易有限公司 | Ultra wideband planar antenna |
| CN107134645B (en) * | 2017-05-23 | 2023-03-21 | 华南理工大学 | FDD antenna based on dual-mode resonator |
| CN109103595B (en) * | 2017-06-21 | 2022-03-18 | 比亚迪股份有限公司 | Bidirectional dual-polarized antenna |
| CN108717994A (en) * | 2018-04-18 | 2018-10-30 | 西安电子科技大学 | A kind of novel planar double frequency band-pass filter antenna applied to WLAN frequency ranges |
| CN108808231A (en) * | 2018-06-01 | 2018-11-13 | 电子科技大学 | A kind of dual polarization plane ultra wide band mimo antenna |
| CN109586025B (en) * | 2019-01-30 | 2024-01-19 | 福州大学 | Miniaturized low-profile broadband directional antenna and terminal applied to WiFi and WiMAX |
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