CN209709179U

CN209709179U - Close coupling gap broadband antenna

Info

Publication number: CN209709179U
Application number: CN201920696249.9U
Authority: CN
Inventors: 王友保; 张明月; 郑大鹏
Original assignee: Nanjing University of Information Science and Technology
Current assignee: Nanjing University of Information Science and Technology
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2019-11-29
Anticipated expiration: 2029-05-16

Abstract

The utility model discloses a kind of close coupling gap broadband antennas, including metal floor and the substrate being overlying on floor, wherein the floor offers several rectangular apertures that can be intercoupled, and the substrate is equipped with microstrip feed line.The utility model antenna has further widened the band bandwidth of SF single feed microstrip slot antenna, may be directly applied to C/X wave band, avoids influence of its all band to communication, and for the frequency range of work in 4-11.25GHZ, return loss is less than -10dB, and impedance bandwidth is up to 95%；In working frequency range, radiation characteristic is good, meets the properties of Antenna Operation, has practical application value；The antenna structure is novel simple, smaller (16mm × 27mm × 0.8mm), and processing aspect is easily integrated, has broad application prospects.

Description

Close coupling gap broadband antenna

Technical field

The utility model belongs to wireless communication technique field, and in particular to a kind of novel close coupling gap broadband antenna.

Background technique

In recent years, with the Development of Wireless Communications of modern society, microstrip slot antenna has structure simple, cost compared with Low, the advantages that being easily integrated, plays not replaceable effect in more and more communications fields.Microstrip slot antenna has been at present The fields such as communication, radar are widely applied to, the status in the military affairs in China, electronic communication, mobile communication is more and more important.

Slot antenna is radiated using the gap of metal covering, does not need to introduce other radiating elements.Microstrip feed line One section of input electromagnetic wave, open end and floor joint direct-coupling, electromagnetic wave enter gap by way of coupling, and gap exists Electromagnetism wave direction space is radiated by the mode of resonance.There are two types of types for common slot antenna, and one is be opened in metal Gap-plate gap on copper sheet.Another is the gap-Waveguide slot antenna being opened on wave guide wall.Slot antenna is in reality It is had broad application prospects in the application of border, however micro-strip narrow slit antenna frequency band is relatively narrow (usual relative bandwidth only has 3% or so) Again limit its practical application.In order to improve its practical application and meanwhile avoid mutiple antennas generate signal between coupling and Interference, antenna must possess broadband technology adaptable therewith.People carry out the broadband properties of microstrip slot antenna thus Extensive and in-depth research.

Existing research scholar proposes cracks on micro-strip aperture slots structure (L-type and inverted T shaped) and circular patch, on ground Opened on plate rectangle, circle, hexagon gap broad-band antenna, these structures may be implemented broadband character to a certain extent and subtract The size of miniature antenna.Document: reaching the clouds, the Yellow River small sized wide-band aperture slots Antenna Design [J] electronic component application, and 2010, 12 (06): 22-23. utilize on floor single radial cut rectangular aperture realize broadband properties, working frequency range 2.89-6.74GHz, Impedance bandwidth 80%.Document: a kind of hexagon gap broadband microwave antenna design [J] of Tan Feifei, Huang Heping, Liu Changjun is too Hertz science and electronic information journal, 2016,14 (02): 245-248 opens hexagon gap on floor, is carried out using unit feeder Feed, impedance bandwidth is up to 51.3%.And in this document involved in traditional square gap bandwidth 30.7%.

Utility model content

Goal of the invention: the utility model provides a kind of close coupling gap broadband antenna, which has widened unit feeder seam The bandwidth of gap antenna solves the problems, such as that existing antenna frequency band is relatively narrow, practical application is not strong.

Technical solution: the close coupling gap broadband antenna of the utility model including metal floor and is overlying on floor Substrate, wherein the floor offers several rectangular apertures that can be intercoupled, and the substrate is presented equipped with micro-strip Line.

The antenna of the utility model directly opens multiple rectangular aperture direct-couplings using slot-coupled on floor, is suitable for C X-band, can apply in detection guidance, space research, the fields such as satellite communication.

Wherein, the metal floor is made of copper.The substrate is made of 4.4 FR4 material by dielectric constant, and size is long 27mm, width 16mm, thickness 0.8mm.The long 23mm of the microstrip feed line, width 1.5mm, 50 Ω of port Impedance.

Several rectangular aperture asymmetric distributions can improve bandwidth using meander coupling technique.

Gap asymmetric distribution on floor, is fed using single microstrip line, and structure is simple, compact dimensions.It utilizes Hfss is emulated, and the parameters of antenna are obtained.

The utility model has the advantages that 1, the utility model antenna has further widened the band bandwidth of SF single feed microstrip slot antenna, it can C/X wave band is directly applied to, avoids influence of its all band to communication, for the frequency range of work in 4-11.25GHZ, return loss is small In -10dB, impedance bandwidth is up to 95%；2, in working frequency range, radiation characteristic is good, meets the properties of Antenna Operation, tool There is practical application value；3, the bandwidth of antenna covering is wider, improves the bandwidth of gap microstrip antenna, and integrated antenna performance is excellent It is good, it works in 7GHZ, total radiation effect can be reached, and reached 13db in entire wave band maximum peak gain；4, should Antenna structure is novel simple, smaller (16mm × 27mm × 0.8mm), and processing aspect is easily integrated, has wide application Prospect.

Detailed description of the invention

Fig. 1 is looking up (a), overlooking (b) structural schematic diagram and dimensional drawing (c) for the utility model；

Fig. 2 is the return loss plot of the utility model；

Fig. 3 is the voltage standing wave ratio figure of the utility model；

Fig. 4 is the peak gain figure of the utility model；

Fig. 5 is the directional diagram that the utility model normalizes Different Plane in 7GHZ.

Fig. 6 is antenna structure view (a) and return loss plot (b) in the prior art.

Specific embodiment

Referring to Fig. 1 to Fig. 5, close coupling gap broadband antenna described in an embodiment of the present invention, mainly by three portions Divide and constitute, is microstrip feed line 1, substrate 2, the metal floor for covering copper respectively.

Substrate 2 selects with a thickness of 0.8mm, and dielectric constant is 4.4 FR4_epoxy material.

The front of antenna is the microstrip feed line 1 of 50 Ω of a root long 23mm, wide 1.5mm, on the back-side ground plate of antenna Multiple rectangular apertures 3 are opened, are intercoupled between gap, bandwidth is improved.

Fig. 2 is the return loss plot of the utility model antenna, and the centre frequency of antenna works in 7GHZ, frequency range 4- 11.25GHZ, it is more wider than band coverage existing in Fig. 6.

Fig. 3 is the voltage standing wave ratio of the utility model antenna, within the scope of entire working band, most work VSWR < 1.5 have good matching properties.

Fig. 4 is that the peak gain a little, obtained is taken every 0.1GHZ in 4-11.25GHZ working frequency range.In 4GHZ, peak Value gain reaches maximum, and peak gain is good in entire scope.

Fig. 5 is center frequency point in 7GHZ, the normalization antenna pattern in the obtained face E/H.It can be seen that this antenna It is omnidirectional antenna, there is good radiation characteristic in all directions.

The design principle of the utility model are as follows:

The first step, the antenna be fabricated on a thickness of 0.8mm, dielectric constant be 4.4 FR4 substrate 2 on, ruler on substrate 2 Very little is 16mm × 27mm.

Second step opens multiple rectangular apertures 3 on the floor of Antenna Design, improves bandwidth using meander coupling technique.

Claims

1. a kind of close coupling gap broadband antenna, it is characterised in that: including metal floor and the substrate being overlying on floor, In, the floor offers several rectangular apertures that can be intercoupled, and the substrate is equipped with microstrip feed line, Ruo Gansuo State rectangular aperture asymmetric distribution.

2. close coupling gap broadband antenna according to claim 1, it is characterised in that: the long 23mm of the microstrip feed line, width Spend 1.5mm, 50 Ω of port Impedance.

3. close coupling gap broadband antenna according to claim 1, it is characterised in that: the long 27mm of the substrate size, width 16mm, thickness 0.8mm.

4. close coupling gap broadband antenna according to claim 1, it is characterised in that: the substrate is by dielectric constant 4.4 FR4 material is made.

5. close coupling gap broadband antenna according to claim 1, it is characterised in that: the metal floor is made of copper.