授課老師 : 陳文山學生 : 陳瑞傑. introduction antenna configuration -brief description...

授課老師陳文山學生陳瑞傑

Introduction

ANTENNA CONFIGURATION-Brief description of the antenna configuration -UWB Antenna Design-Describes the design method and simulation results

using Ansoft HFSS Software

Results and discussion

Conclusion

AbstractmdashA compact planar ultrawideband (UWB) antenna with band notched characteristics is presented Modification in the shape of radiation element and ground plane with two symmetrical bevel slots on the lower edge of the radiation element and on the upper edge of the ground plane makes the antenna different from the rectangular printed monopole These slots improve the input impedance bandwidth and the high frequency radiation characteristics

With this design the reflection coefficient is lower than 10 dB in the 31ndash106 GHz frequency range and radiation pattern is similar to dipole antenna With the inclusion of an additional small radiation patch a frequency-notched antenna is also designed and good out of band performance from 50ndash60 GHz can be achieved Measured results confirm that the antenna is suitable for UWB applications due to its compact size and high performance

資料來源 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION VOL 58 NO1 JANUARY 2010


L1= 30mm W =18mm l1=144mm l2 =144mm g = 12mm L = l1+l2+g w1 = 35mm h = 3mm s = 11mmlf = 156mm Wf = 14mm a=53mm b = 7mm

shows the geometry of the proposed antenna It consists of a rectangular radiation patch with symmetrical bevel slots placed on the lower side of the patch and a partially modified rectangular ground plane with symmetrical bevel slots locatedon its upper side

A small rectangular patch with dimensions and printed on the bottom side of the substrate is connected to the 50 line through via-hole to produce a notched band in the vicinity of 55 GHz and thus prevents the interference with WLAN systemsThe antenna was implemented on an inexpensive FR4 substrate with a thickness of 076 mm and relative permittivity of 44

Fig 1 Configuration of the proposed band notched UWB printed antenna

shows the simulated and measured reflection coefficient curves The measurement confirms the UWB and band-rejection characteristics of the proposed antenna as predicted in the simulation


The antenna covering the full UWB band(31ndash106GHz)is first described Then the new band notched structure which is equivalent to series LC circuit is investigated The effects of changing the geometric parameters of the proposed antenna on impedance bandwidth and radiation patternare discussed

Fig 2 Measured and simulated reflection coefficients of the proposed UWB antenna

資料來源 THOMAS AND SREENIVASAN A SIMPLE UWB PLANAR RECTANGULAR PRINTED ANTENNA

Fig 3 Simulated reflection coefficients for the proposed antenna of various bevel widths (W1) with a fixed value of bevel height (h1) = 3 mm a = b = 0mm Other parameters are the same as

given in Fig1

Fig 4 Simulated reflection coefficients for the proposed antenna of various bevel heights (h1) with a fixed value of bevel width (w1) = 35 mm a = b = 0 mm Other parameters are the same as given in Fig 1

Figs 3 and 4 show the variation of the reflection coefficients with frequency for different dimensions of the bevel slots It is seen that in the absence of bevelsw1 = 0 mm the reflection coefficient behavior at low frequencies is identical to a narrow band dipole with current mainly distributed over the radiation patch and the ground plane The placing of slots significantly Improves the higher band impedance matching as the shaping of the lower edge of the radiation patch has a substantial effect on the impedance matching of printed monopole antennas In other words by properly choosing the dimensions of slots impedance bandwidth can be enhanced From the simulated results in Figs 3 and 4 it occurs when w1 = 35 mm and h1 = 3 mm

lWrl 2

Simple Formula for Resonant Frequency


where W is the width of the rectangular disc The lower frequency f L is given by

GHzprl

fL

27

lWrh 2

By equating the area of the planar printed configuration tothat of a cylindrical wire of length h

At fundamental resonance the length of cylindrical dipole forreal input impedance is given by

rel

arear

2

reεl since h arealwrl re 2

7


From the above equations the resonant frequency is given by

Fl 480

rl

lF

2 480

2rl

zrl

fr

G2

414

where and are in centimeters If l1 and denote the length of the ground plane and radiation patch respectively and is the gap between them then can be expressed as l1 + l2 + g


Similarly if r1 and r2 represent the radius of equivalent cylindricaldipole corresponding to the ground plane and radiationpatch then 2r can be expressed as r1+r2 (In the case of cylindricaldipole r1 and r2 can be considered as the radius of thedipole arms and r1 = r2 = r)

GHzrrgll

fr2121

414

relr

1

11

2

relr

2

22

2

where A1 and A2 are the area of the ground plane and the radiation patch respectivelyl1 l2 r1 r2 and g are in centimeters

資料來源 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION VOL 58 NO 1 JANUARY 20109

Width(mm)

Simulated resonant Frequency

(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313

EFFECT OF WIDTHS OF THE GROUND PLANE AND RADIATION PATCH ON RESONANT FREQUENCY FOR THE PROPOSED ANTENNA WITH CONSTANT STEP WIDTHS (s = 11 mm) DENOTES THE WIDTH OF THE GROUND PLANE AND Wr DENOTES THE WIDTH OF THE RADIATION ELEMENT


TABLE I

10

TABLE II

SIMULATED VARIATION OF RESONANT FREQUENCY WITH CHANGE IN DIELECTRIC CONSTANT OF THE SUBSTRATE MATERIAL FOR THE PROPOSED ANTENNA WITHOUT BEVEL SLOTS

Dielectric constant(εr)

22

44

102

Resonant frequency (GHz)

calculated simulated

417 393

430 420

444 436



TABLE III

COMPARISON OF RESONANT FREQUENCIES FOR VARIOUS TYPES OF PRINTED MONOPOLE ANTENNA CONFIGURATIONS

Antenna configurationResonant Frequency

(GHz)

Calculated Measured

1) Circular monopole with rectangular ground plane

314 305

2) Elliptical monopole with rectangular ground plane

374 365

3) Microstrip- fed planar ellipticaldipole

220 227

Fig 5 Simulated reflection coefficients for the proposed antenna of various notch element length a with a fixed notch element width b = 7 mm Other parameters are the same as given in Fig 1

Fig 6 Simulated reflection coefficients for the proposed antenna of variousnotch element width b with a fixed notch element length a = 53 mm Otherparameters are the same as given in Fig 1

Figs 5 and 6 show the variation of simulated reflection coefficients with different values of and


TABLE IV

EFFECT OF WIDTH OF THE RECTANGULAR PATCH ON RESONANT FREQUENCY OF THE REJECTED BAND FOR CONSTANT PATCH LENGTH a = 53 mm 1048576

Patch width ldquobrdquo (mm)


Calculated simulated

5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V

EFFECT OF LENGTH OF THE RECTANGULAR PATCH ON RESONANT FREQUENCY OF THE REJECTED BAND FOR CONSTANT PATCH WIDTH

Patch length ldquoardquo(mm)



49 580 614

51 564 582

53 550 555

55 537 525

57 525 507


Fig 7 Simulated current distribution of the proposed antenna (a) pass-band(at 35 GHz) and (b) stop-band (at 55 GHz)


proposed antenna is indeed controlled by the length and width b of the rectangular patch

17資料來源 THOMAS AND SREENIVASAN A SIMPLE UWB PLANAR RECTANGULAR PRINTED ANTENNA

Fig8Measured radiation patterns of the proposed band notched UWB antenna in x-y plane ( Etheta and Ephi component)

MEASURED ANTENNA PERFORMANCE

Fig9Measured radiation patterns of the proposed band notched UWB antenna In x-z plane ( and component)

frequencies the patterns deviate from symmetry as can be seen at 60 and 90 GHz

18

Fig 10 Measured and simulated gain of the proposed band notched UWB antenna

Fig 11 Photograph of the fabricated antenna

UWB frequency band and a gain drop of 6ndash7 dB occurs at 55GHz A photograph of the proposed antenna when printed on FR4 substrate is displayed in Fig 11

shows the measured and simulated gains of the realized antenna from 3ndash11 GHz Close agreement betweenmeasured and simulated results can be found The measured antennagain variations are less than 2 dB throughout the desired


19

The overall antenna size is 30 mm x 18 mm x 076 mm The antenna compact and simple has minimum design parameters which have been investigated for optimal design an approximate empirical formula is presented to calculate the lowest resonant frequency for the planar printed monopoledipole antennas in general The present design can easily be extended to dual or triple band-notched antennas The operating bandwidthof the proposed antenna covers the entire frequency band from 31ndash106 GHz Both simulated and measured results suggest that the proposed antenna is suitable for UWB communication applications and at the same time dispenses the interference with WLAN systems

20

這篇是在說一個矩形平面超寬帶印刷天線該天線結構緊湊操作簡單最小的設計參數進行了研究設計經過公式的計算模擬測試出天線適合於超寬帶通信的應用

Slide 1

Introduction

ANTENNA CONFIGURATION-Brief description of the antenna configuration -UWB Antenna Design-Describes the design method and simulation results

using Ansoft HFSS Software

Results and discussion

Conclusion















given in Fig1



lWrl 2




GHzprl

fL

27

lWrh 2



rel

arear

2


7



Fl 480

rl

lF

2 480

2rl

zrl

fr

G2

414




GHzrrgll

fr2121

414

relr

1

11

2

relr

2

22

2



Width(mm)


(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313



TABLE I

10

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1















given in Fig1



lWrl 2




GHzprl

fL

27

lWrh 2



rel

arear

2


7



Fl 480

rl

lF

2 480

2rl

zrl

fr

G2

414




GHzrrgll

fr2121

414

relr

1

11

2

relr

2

22

2



Width(mm)


(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313



TABLE I

10

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1

lWrl 2




GHzprl

fL

27

lWrh 2



rel

arear

2


7



Fl 480

rl

lF

2 480

2rl

zrl

fr

G2

414




GHzrrgll

fr2121

414

relr

1

11

2

relr

2

22

2



Width(mm)


(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313



TABLE I

10

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1



Fl 480

rl

lF

2 480

2rl

zrl

fr

G2

414




GHzrrgll

fr2121

414

relr

1

11

2

relr

2

22

2



Width(mm)


(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313



TABLE I

10

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1


GHzrrgll

fr2121

414

relr

1

11

2

relr

2

22

2



Width(mm)


(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313



TABLE I

10

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1

Width(mm)


(GHz)Wg = 10 Wr = 10 367

Wg = 10 Wr = 18 356

Wg = 10 Wr = 18 350

Wg = 10 Wr = 26 336

Wg = 10 Wr = 26 313



TABLE I

10

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1

TABLE II



22

44

102



417 393

430 420

444 436



TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1


TABLE III



(GHz)

Calculated Measured


314 305


374 365


220 227





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1





TABLE IV





5 670 653

6 604 619

7 550 555

8 503 510

9 461 455


TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1

TABLE V





49 580 614

51 564 582

53 550 555

55 537 525

57 525 507










18






19


20


Slide 1









18






19


20


Slide 1

19


20


Slide 1

20


Slide 1

授課老師 : 陳文山 學生 : 陳瑞傑. introduction antenna configuration -brief description...

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授課老師 : 陳文山學生 : 陳瑞傑. introduction antenna configuration -brief description...