CN104183915A - PIFA with I-shaped fractal EBG structure as floor - Google Patents

PIFA with I-shaped fractal EBG structure as floor Download PDF

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Publication number
CN104183915A
CN104183915A CN201410409826.3A CN201410409826A CN104183915A CN 104183915 A CN104183915 A CN 104183915A CN 201410409826 A CN201410409826 A CN 201410409826A CN 104183915 A CN104183915 A CN 104183915A
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CN
China
Prior art keywords
floor
radiation fin
left end
rectangular indentation
fractal
Prior art date
Application number
CN201410409826.3A
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Chinese (zh)
Inventor
李红梅
邢立鲲
王金悦
孙士明
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哈尔滨工业大学
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Application filed by 哈尔滨工业大学 filed Critical 哈尔滨工业大学
Priority to CN201410409826.3A priority Critical patent/CN104183915A/en
Publication of CN104183915A publication Critical patent/CN104183915A/en

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Abstract

The invention relates to a PIFA, in particular to a PIFA with an I-shaped fractal EBG structure as a floor. The PIFA solves the problems that an existing PIFA is low in radiation efficiency and large in overall size. The PIFA comprises a radiation sheet, a short-circuit board, a floor, a coaxial inner conductor and a coaxial outer conductor. The radiation sheet and the floor are sequentially arranged side by side in parallel from top to bottom, the left end of the radiation sheet is connected with the left end of the floor through the short-circuit board, and the coaxial outer conductor is vertically arranged below the left end of the floor. The PIFA is applied to the field of wireless communication.

Description

A kind ofly take the PIFA antenna that the fractal EBG structure of work shape is floor

Technical field

The present invention relates to a kind of PIFA antenna, be specifically related to a kind of PIFA antenna that the fractal EBG structure of work shape is floor of take, belong to wireless communication field.

Background technology

Radio-frequency (RF) identification based on cell phone platform is that RFID reader is combined with the mobile phone as mobile communication terminal, take RFID technology as means, by the new technology of mobile communications network platform quick obtaining information.PIFA antenna, since producing, because its size is less, can make full use of pcb board as ground plane, and by resonance length lock pin, be quarter-wave by ground strip, is the principal mode of built-in aerial always.The peculiar frequency band gap characteristic of EGB (electro-magnetic bandgap) structure, make it as a kind of novel manual electromagnetic structure, in the frequency range of microwave and millimeter wave, have a very wide range of applications, wherein as the reflecting plate of antenna, aspect raising antenna radiation efficiency, significantly applied.But, due to the intrinsic periodic feature of EBG structure self, while causing it to want to reach the electrical characteristics of target, often there is very large size again, increase system bulk that can be to a great extent, thus with integrated circuit (IC) system comprehensive in be subject to very large restriction.

Summary of the invention

The present invention is lower for solving existing PIFA antenna radiation efficiency, the problem that antenna overall volume is larger, and then a kind of PIFA antenna that the fractal EBG structure of work shape is floor of take is proposed.

The present invention addresses the above problem the technical scheme of taking to be: the present invention includes radiation fin, short board, floor, coaxial inner conductor and coaxial outer conductor, radiation fin, floor from top to bottom be arranged in parallel successively side by side, the end of radiation fin left end is connected with the end of floor left end by short board, coaxial outer conductor is vertically arranged on the below of floor left end, and the upper end of coaxial outer conductor is connected with the lower surface of floor left end, coaxial inner conductor is vertically arranged between radiation fin and floor, and the upper end of coaxial inner conductor is connected with the lower surface of radiation fin left end, the lower end of coaxial inner conductor is inserted in coaxial outer conductor through the upper surface of floor left end, radiation fin and floor are rectangle plate body, the middle part on a long limit of radiation fin has the first rectangular indentation, radiation fin has two the second rectangular indentation on another long limit, and two the second rectangular indentation are positioned at the both sides of the first rectangular indentation, the upper surface on floor two ranked first I-shaped groove along its length, the both sides of each the first I-shaped groove are respectively provided with respectively a second I-shaped groove, and the translot of each the second I-shaped groove is all communicated with the vertical slot of the first I-shaped groove, between adjacent two the first I-shaped grooves, be provided with gap, and each gap center line is along its length all parallel with the center line of floor broad ways.

Technique effect of the present invention is: the present invention uses EBG structure as the reflecting plate of PFIA antenna, to improve radiation efficiency, EBG structure adopts work shape fractal structure to realize the miniaturization of EBG structure simultaneously, to the processing of slotting of conventional P FIA antenna, the multiband radiation that realizes FPIA antenna reaches operating frequency needs.

Resonance of the present invention is at 0.82G~1.04GHz, frequency bandwidth 0.22GHz, and centre frequency is 0.93GHz.0.81G~1.05GHz with simulation result compares, and that coincide is fine, frequency bandwidth 0.24GHz, and centre frequency is also 0.93GHz.Actual measurement gain is 3.26dB, than the 2.57dB of traditional planar inverted-F antenna, has improved 0.69dB, so, to floor effectively suppressing antenna surface wave and the backward radiation really of antenna loading EBG structure, improve the gain of antenna.The backward radiation that the present invention has loaded the planar inverted-F antenna of spiral type EBG structure obviously reduces, and it is large that main lobe becomes, and main radiation direction is clearer and more definite, so loaded the antenna of EBG structure, has represented better directivity.

Accompanying drawing explanation

Fig. 1 is front view of the present invention, and Fig. 2 is the vertical view of radiation fin, and Fig. 3 is the vertical view on floor, and Fig. 4 is the fractal EBG-PIFA of work type | S 11| result schematic diagram, Fig. 5 is the fractal EBG-PIFA of work type and traditional PI FA directional diagram.

Embodiment

Embodiment one: present embodiment is described in conjunction with Fig. 1 to Fig. 5, a kind ofly described in present embodiment take the PIFA antenna that the fractal EBG structure of work shape is floor and comprise radiation fin 1, short board 2, floor 3, coaxial inner conductor 4 and coaxial outer conductor 5, radiation fin 1, floor 3 from top to bottom be arranged in parallel successively side by side, the end of radiation fin 1 left end is connected with the end of floor 3 left ends by short board 2, coaxial outer conductor 5 is vertically arranged on the below of floor 3 left ends, and the upper end of coaxial outer conductor 5 is connected with the lower surface of floor 3 left ends, coaxial inner conductor 4 is vertically arranged between radiation fin 1 and floor 3, and the upper end of coaxial inner conductor 4 is connected with the lower surface of radiation fin 1 left end, the lower end of coaxial inner conductor 4 is inserted in coaxial outer conductor 5 through the upper surface of floor 3 left ends, radiation fin 1 and floor 3 are rectangle plate body, the middle part on 1 one long limits of radiation fin has the first rectangular indentation 1-1, radiation fin has two the second rectangular indentation 1-2 on 1 another long limit, and two the second rectangular indentation 1-2 are positioned at the both sides of the first rectangular indentation 1-1, the upper surface on floor 3 two ranked first I-shaped groove 3-1 along its length, the both sides of each the first I-shaped groove 3-1 are respectively provided with respectively a second I-shaped groove 3-2, and the translot of each the second I-shaped groove 3-2 is all communicated with the vertical slot of the first I-shaped groove 3-1, between adjacent two the first I-shaped groove 3-1, be provided with gap 3-3, and each gap 3-3 center line is along its length all parallel with the center line of floor 3 broad wayss.

Embodiment two: present embodiment is described in conjunction with Fig. 1 to Fig. 3, described in present embodiment, a kind of length of radiation fin 1 of take the PIFA antenna that the fractal EBG structure of work shape is floor is 40mm, the width of radiation fin 1 is 20mm, distance L 1 between the first rectangular indentation 1-1 and radiation fin 1 left end is 20mm, between the second rectangular indentation 1-2 of contiguous radiation fin 1 left end and radiation fin 1 left end, distance L 2 is 10mm, away from the second rectangular indentation 1-2 of radiation fin 1 left end and the distance L 3 between radiation fin 1 left end, be 30mm, the width of the first rectangular indentation 1-1 is 9mm, the degree of depth of the first rectangular indentation 1-1 is 16mm, the width of each the second rectangular indentation 1-2 is 9mm, the degree of depth of each the second rectangular indentation 1-2 is 16mm.

The technique effect of present embodiment is: so arrange, increased the electric current path of flowing through, increase electrical length, guaranteed that antenna resonance is at required frequency, notch depth is darker, and is conducive to radiation, makes beamwidth of antenna broadening, has met the mechanical strength of antenna simultaneously.Other composition and annexation are identical with embodiment one.

Embodiment three: in conjunction with Fig. 1 to Fig. 3, present embodiment is described, a kind of width of short board 2 of take the PIFA antenna that the fractal EBG structure of work shape is floor is 2mm described in present embodiment, and the length of short board 2 is 10mm.

The technique effect of present embodiment is: so arrange, make antenna resonance at required frequency, and notch depth is darker.Other composition and annexation are identical with embodiment one.

Embodiment four: present embodiment is described in conjunction with Fig. 1 to Fig. 3, described in present embodiment, a kind of width of floor 3 of take the PIFA antenna that the fractal EBG structure of work shape is floor is 20mm, the length on floor 3 is 40mm, and the distance between radiation fin 1 lower surface and floor 3 upper surfaces is 10mm.

The technique effect of present embodiment is: so arrange, be conducive to increase the radiation efficiency of antenna.Other composition and annexation are identical with embodiment one.

Embodiment five: in conjunction with Fig. 1 to Fig. 3, present embodiment is described, a kind of axis of coaxial inner conductor 4 of take the PIFA antenna that the fractal EBG structure of work shape is floor and the distance L 4 between 3 left ends of floor are 3mm described in present embodiment.

The technique effect of present embodiment is: so arrange, the impedance matching of antenna is met, notch depth is increased.Other composition and annexation are identical with embodiment one.

Embodiment six: present embodiment is described in conjunction with Fig. 1 to Fig. 3, described in present embodiment, the length D1 of the translot of a kind of each the first I-shaped groove 3-1 of take the PIFA antenna that the fractal EBG structure of work shape is floor is 5mm, the width W 1 of the translot of each the first I-shaped groove 3-1 is 1mm, the length D2 of the translot of each the second I-shaped groove 3-2 is 1mm, and the width W 2 of the translot of each the second I-shaped groove 3-2 is 0.2mm.

The technique effect of present embodiment is: so arrange, increased the equivalent capacity of structure, so, make resonance frequency continue to reduce, expanded bandwidth, reached 0.78~1.27GHz, perfection has covered target frequency bands.Other composition and annexation are identical with embodiment one.

Embodiment seven: in conjunction with Fig. 1 to Fig. 3, present embodiment is described, the width of a kind of each gap 3-3 of take the PIFA antenna that the fractal EBG structure of work shape is floor is 0.2mm described in present embodiment.

The technique effect of present embodiment is: so arrange, make this EBG floor resonance frequency reach required frequency range.Other composition and annexation are identical with embodiment one.

Operation principle

In order to reduce the resonance frequency of EBG structure, by resonant frequency equation known, need to increase electric capacity or the inductance of structure, to structure fluting, can increase electric capacity, introducing helical structure can increase inductance.The present invention's select to go into operation mode of shape groove increases electric capacity, and has carried out once fractally, makes EBG structure further reach miniaturization.

Claims (7)

1. take the PIFA antenna that the fractal EBG structure of work shape is floor for one kind, it is characterized in that: describedly a kind ofly take the PIFA antenna that the fractal EBG structure of work shape is floor and comprise radiation fin (1), short board (2), floor (3), coaxial inner conductor (4) and coaxial outer conductor (5), radiation fin (1), floor (3) from top to bottom be arranged in parallel successively side by side, the end of radiation fin (1) left end is connected with the end of floor (3) left end by short board (2), coaxial outer conductor (5) is vertically arranged on the below of floor (3) left end, and the upper end of coaxial outer conductor (5) is connected with the lower surface of floor (3) left end, coaxial inner conductor (4) is vertically arranged between radiation fin (1) and floor (3), and the upper end of coaxial inner conductor (4) is connected with the lower surface of radiation fin (1) left end, the lower end of coaxial inner conductor (4) is inserted in coaxial outer conductor (5) through the upper surface of floor (3) left end, radiation fin (1) and floor (3) are rectangle plate body, the middle part on (1) long limit of radiation fin has the first rectangular indentation (1-1), radiation fin (1) has two the second rectangular indentation (1-2) on another long limit, and two the second rectangular indentation (1-2) are positioned at the both sides of the first rectangular indentation (1-1), the upper surface on floor (3) is provided with along its length two and ranked first I-shaped groove (3-1), the both sides of each the first I-shaped groove (3-1) are respectively provided with respectively a second I-shaped groove (3-2), and the translot of each the second I-shaped groove (3-2) is all communicated with the vertical slot of the first I-shaped groove (3-1), between adjacent two the first I-shaped grooves (3-1), be provided with gap (3-3), and each gap (3-3) center line is along its length all parallel with the center line of floor (3) broad ways.
2. a kind ofly according to claim 1 take the PIFA antenna that the fractal EBG structure of work shape is floor, it is characterized in that: the length of radiation fin (1) is 40mm, the width of radiation fin (1) is 20mm, distance (L1) between the first rectangular indentation (1-1) and radiation fin (1) left end is 20mm, between second rectangular indentation (1-2) of contiguous radiation fin (1) left end and radiation fin (1) left end, distance (L2) is 10mm, away from second rectangular indentation (1-2) of radiation fin (1) left end and the distance (L3) between radiation fin (1) left end, be 30mm, the width of the first rectangular indentation (1-1) is 9mm, the degree of depth of the first rectangular indentation (1-1) is 16mm, the width of each the second rectangular indentation (1-2) is 9mm, the degree of depth of each the second rectangular indentation (1-2) is 16mm.
3. a kind ofly according to claim 1 take the PIFA antenna that the fractal EBG structure of work shape is floor, it is characterized in that: the width of short board (2) is 2mm, the length of short board (2) is 10mm.
4. a kind ofly according to claim 1 take the PIFA antenna that the fractal EBG structure of work shape is floor, it is characterized in that: the width of floor (3) is 20mm, the length on floor (3) is 40mm, and the distance between radiation fin (1) lower surface and floor (3) upper surface is 10mm.
5. a kind ofly according to claim 1 take the PIFA antenna that the fractal EBG structure of work shape is floor, it is characterized in that: the distance (L4) between the axis of coaxial inner conductor (4) and floor (3) left end is 3mm.
6. a kind ofly according to claim 1 take the PIFA antenna that the fractal EBG structure of work shape is floor, it is characterized in that: the length (D1) of the translot of each the first I-shaped groove (3-1) is 5mm, the width (W1) of the translot of each the first I-shaped groove (3-1) is 1mm, the length (D2) of the translot of each the second I-shaped groove (3-2) is 1mm, and the width (W2) of the translot of each the second I-shaped groove (3-2) is 0.2mm.
7. a kind ofly according to claim 1 take the PIFA antenna that the fractal EBG structure of work shape is floor, it is characterized in that: the width of each gap (3-3) is 0.2mm.
CN201410409826.3A 2014-08-19 2014-08-19 PIFA with I-shaped fractal EBG structure as floor CN104183915A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010028182A (en) * 2008-07-15 2010-02-04 Harada Ind Co Ltd Antenna apparatus capable of suppressing inter-coupling among antenna elements
CN102510658A (en) * 2011-09-26 2012-06-20 北京邮电大学 Implementation method of H-type groove fractal UC-EBG (Uniplanar Compact Electromagnetic Band Gap) structure oriented to multifrequency antenna substrate
CN102834974A (en) * 2010-04-28 2012-12-19 古河电气工业株式会社 Plane-structured ebg
US8595924B2 (en) * 2005-10-21 2013-12-03 William E. McKinzie, III Method of electromagnetic noise suppression devices using hybrid electromagnetic bandgap structures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8595924B2 (en) * 2005-10-21 2013-12-03 William E. McKinzie, III Method of electromagnetic noise suppression devices using hybrid electromagnetic bandgap structures
JP2010028182A (en) * 2008-07-15 2010-02-04 Harada Ind Co Ltd Antenna apparatus capable of suppressing inter-coupling among antenna elements
CN102834974A (en) * 2010-04-28 2012-12-19 古河电气工业株式会社 Plane-structured ebg
CN102510658A (en) * 2011-09-26 2012-06-20 北京邮电大学 Implementation method of H-type groove fractal UC-EBG (Uniplanar Compact Electromagnetic Band Gap) structure oriented to multifrequency antenna substrate

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Application publication date: 20141203

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