CN207038706U

CN207038706U - A kind of Broadband circularly polarized antenna based on V-type gap

Info

Publication number: CN207038706U
Application number: CN201720680845.9U
Authority: CN
Inventors: 黄惠芬; 王彬
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2017-06-13
Filing date: 2017-06-13
Publication date: 2018-02-23
Anticipated expiration: 2027-06-13

Abstract

The utility model discloses a kind of Broadband circularly polarized antenna based on V-type gap, including medium substrate, the medium substrate back up Z-type microstrip feed line, the Z-type microstrip feed line connects stub, the medium substrate front sets radiation patch, aperture slots and closed gap are etched in the radiation patch, the aperture slots and closed gap are V-type right angle gap and symmetrical on the vertical center line of radiation patch, Broadband circularly polarized antenna of the present utility model, have the characteristics that simple in construction, size is small, it is easy regulation, circular polarisation band it is wide.

Description

A kind of Broadband circularly polarized antenna based on V-type gap

Technical field

It the utility model is related to a kind of Broadband circularly polarized antenna, and in particular to a kind of based on the broadband circle polarized of V-type gap Antenna.

Background technology

Due to circular polarized antenna unique advantage in mobile communications, it is set to receive great attention.Circular polarized antenna Due to insensitive to rotation direction, the problem of traditional linear polarized antenna can be avoided to produce signal attenuation in polarization mismatch.Line pole Changing ripple, easily generation polarization rotation causes to decay in transmission environment, and circularly polarised wave runs into barrier meeting reversely, because direct projection Ripple and back wave have polarization isolation, so circularly polarised wave has very strong antijamming capability and anti-misty rain ability, and in the people It is widely used with military domain.Due to the unique anti-interference and anti-fading characteristic of circular polarized antenna, GPS is widely used in In the communication system such as (global positioning system), RFID (radio frequency identification), WLAN (wireless MAN).

The difficult point of design Broadband circularly polarized antenna is impedance and axle ratio while reaches broadband character and keep antenna Small size performance.Common circular polarisation technology has following several：To radiation patch corner cut, perturbation list is introduced in square gap Member, cross dipole antenna, using feeding network of 90 ° of phase differences etc..But these methods have the size big and narrow bandwidth Shortcoming.Traditional slot antenna size is often half-wavelength, and aperture slots antenna size is usually quarter-wave.Therefore Small size can be kept while broadband is reached using aperture slots design circular polarized antenna.

Utility model content

In order to overcome shortcoming and deficiency existing for prior art, the utility model provides a kind of broadband based on V-type gap Circular polarized antenna, the circular polarized antenna have the advantages that simple in construction, making is easy, broadband, small size.

The utility model adopts the following technical scheme that：

A kind of Broadband circularly polarized antenna based on V-type gap, including medium substrate, the medium substrate back up Z-type Microstrip feed line, the Z-type microstrip feed line connect stub, and the medium substrate front sets radiation patch, the radiation patch Upper etching aperture slots and closed gap, the aperture slots and closed gap are V-type right angle gap and on radiation patch Vertical center line it is symmetrical.

The Z-type microstrip feed line is made up of three microstrip lines, respectively the first microstrip line, the second microstrip line and the 3rd micro-strip Line, first microstrip line and the 3rd microstrip line are respectively perpendicular to the both ends of the second microstrip line, the stub and the second micro-strip Line vertical connection.

The length of the aperture slots is about the half wavelength of operating frequency of antenna.

The Z-type microstrip feed line corresponds to the corresponding position in the medium substrate back side by the aperture slots close to summit side Put, couple feed is carried out to aperture slots.

The width of aperture slots is more than the width of closed gap.

The size of the radiation patch is identical with the size of medium substrate.

The beneficial effects of the utility model：

The utility model employs the structure of aperture slots, effectively reduces the size of antenna；

Stub is added on the utility model Z-type microstrip feed line, multifrequency resonance is formed, is effectively increased the resistance of antenna Anti- bandwidth；

The utility model introduces V-type closed gap on paster, so that orthogonal electric field reaches 90 ° of phases on broadband Potential difference, form the circular polarisation in broadband.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

Fig. 2 is physical dimension figure of the present utility model, and unit is millimeter；

Fig. 3 is the return loss plot that embodiment emulates in Fig. 1；

Fig. 4 is the axle of the utility model embodiment emulation than figure.

Embodiment

With reference to embodiment and accompanying drawing, the utility model is described in further detail, but reality of the present utility model Apply mode not limited to this.

Embodiment

As Figure 1-Figure 2, a kind of Broadband circularly polarized antenna based on V-type gap, including medium substrate, the medium base Back prints Z-type microstrip feed line, and the Z-type microstrip feed line is made up of three microstrip lines, respectively the first microstrip line 1a, second Microstrip line 1b and the 3rd microstrip line 1c, described first and the 3rd microstrip line respectively with the second microstrip line vertical connection, the cutting back Line 2 is connected with the second microstrip line, and first microstrip line is connected with medium substrate left hand edge, one side of the 3rd microstrip line and medium Substrate top edge connects.

The medium substrate front printing radiation patch 6, the size of the radiation patch is identical with the size of medium substrate, The radiation patch is etched with aperture slots 4 and closed gap 5, and described two gaps are V-type right angle gap, the present embodiment In, the length and width of V-type aperture slots are more than the length and width of V-type closed gap, aperture slots and closed gap opening Direction is identical, equal upward opening, and symmetrical on radiation patch vertical center line, the V-type aperture slots and V-type closed gap Two side is parallel to each other, and closed gap is located at the lower section of aperture slots in embodiment, and its summit is on same straight line, open seam The length of gap is about the half wavelength of operating frequency of antenna.

Position on the left of the aperture slots summit is the specific feed placement of aperture slots, its corresponding medium substrate back of the body Z-type microstrip feed line is printed in face position, carries out couple feed to aperture slots, can preliminarily encourage low-frequency resonant and entelechy Change.

It is to realize low-frequency resonant first, and obtains preliminary circular polarisation.Aperture slots 4 are etched in radiation patch 6, The back side of medium substrate carries out couple feed by ad-hoc location 3 of the Z-type microstrip feed line Jing Guo V-type aperture slots to gap.Can be with Low-frequency resonant and circular polarisation are preliminarily encouraged.

The Z-type microstrip feed line is made up of three microstrip lines, respectively the first microstrip line, the second microstrip line and the 3rd micro-strip Line, first microstrip line and the 3rd microstrip line are respectively perpendicular to the both ends of the second microstrip line, the stub and the second micro-strip Line vertical connection, as shown in figure 1, the second microstrip line is located at medium substrate back position corresponding to aperture slots, the stub Perpendicular to the second microstrip line.

Secondly introduce multifrequency resonance and widen impedance bandwidth, stub 2 is accessed on Z-type microstrip feed line, it is more so as to introduce Frequency resonance, is effectively increased impedance bandwidth.

Finally realize the circular polarization characteristics of whole frequency band.V-type closed gap is etched in radiation patch 6, is made on paster mutually Mutually orthogonal electric field reaches 90 ° of phase differences, so as to be less than 3dB in whole frequency band axle ratio, that is, reaches circular polarisation.

In order to verify the validity of this programme, instantiation is given below and illustrates.

In this example, it is 4.4 from relative dielectric constant, loss angle tangent 0.02, the FR4 that thickness is 0.8mm is situated between Matter substrate, the planar dimension of medium substrate is 44 × 42mm.Stub lengths are 5.6mm, the wide 7.2mm of V-type aperture slots, are closed Slit width 3mm, long 16.5mm, remainder size as shown in table 1 are directly presented in actually implementing with 50 ohm of coaxial lines Electricity, the inner wire of coaxial line are connected with microstrip feed line, and outer conductor is connected with radiation patch, and specific size is as shown in table 1, single Position mm：

Table 1

L	W	H	L1	L2	L3	L4	L5
								42	44	0.8	12.6	7.4	16.5	14	5.5
L6	L7	L8	L9	L10	W1	W2	W3
								23.2	6.3	5.6	11.8	19	22	7.2	3
W4	W5	W6	W7	W8
								2.9	4.2	2.3	2	3.6

The return loss and axle ratio result that the circular polarized antenna made with above-mentioned Fig. 2 illustrated dimensions emulates respectively such as Fig. 3 and Fig. 4.As seen from the figure, for the circular polarized antenna in 2.19-4.6GHz, return loss is less than -10dB, and axle ratio is less than 3dB, opposite band A width of 71%, Broadband circularly polarized antenna of the present utility model has that simple in construction, size is small, easy regulation, circular polarisation band are wide etc. Feature, it is suitable for the high-speed data communication scenes such as RFID, WLAN, WIMAX.

Above-described embodiment is the preferable embodiment of the utility model, but embodiment of the present utility model is not by described The limitation of embodiment, it is other it is any without departing from Spirit Essence of the present utility model with made under principle change, modify, replace Generation, combination, simplify, should be equivalent substitute mode, be included within the scope of protection of the utility model.

Claims

A kind of 1. Broadband circularly polarized antenna based on V-type gap, it is characterised in that including medium substrate, the medium substrate back of the body Z-type microstrip feed line is printed in face, and the Z-type microstrip feed line connects stub, and the medium substrate front sets radiation patch, described Etch aperture slots and closed gap in radiation patch, the aperture slots and closed gap be V-type right angle gap and on The vertical center line of radiation patch is symmetrical.
2. Broadband circularly polarized antenna according to claim 1, it is characterised in that the Z-type microstrip feed line is by three micro-strips Line is formed, respectively the first microstrip line, the second microstrip line and the 3rd microstrip line, the first microstrip line and the 3rd the microstrip line difference Perpendicular to the both ends of the second microstrip line, the stub and the second microstrip line vertical connection.
3. Broadband circularly polarized antenna according to claim 1, it is characterised in that the length of the aperture slots is antenna work The half wavelength of working frequency.
4. Broadband circularly polarized antenna according to claim 1, it is characterised in that opened described in the Z-type microstrip feed line process Mouth gap corresponds to medium substrate back side opposite position close to summit side.
5. Broadband circularly polarized antenna according to claim 1, it is characterised in that the width of aperture slots is more than closed gap Width.
6. Broadband circularly polarized antenna according to claim 1, it is characterised in that the size of the radiation patch and medium base The size of plate is identical.