LOW-PROFILE PLANAR PATCH ANTENNA ARRAYLOW-PROFILE PLANAR PATCH ANTENNA ARRAY For 10 GHz with Gain > +30 dBi

To: “50 MHz & UP” CLUB, North California

From: MIROSLAV PAJOVIC (WA6MP)From: MIROSLAV PAJOVIC (WA6MP)Sr. Antenna Design Engineer

“MP Antennas and Arrays R&D”

About the author

Received Graduate Diploma Degree in Electrical Engineering from U i it f B l d S bi d th l ti t MSEE i USAUniversity of Belgrade, Serbia; and the evaluation to MSEE in USA, 1994.

Professionally active in Silicon Valley for 20+ years Used to work for Professionally active in Silicon Valley for 20+ years. Used to work for Sanmina and Nortel Networks Corps. as Sr. EMI/RF Engineer; for Cisco Systems as a Technical EMI Leader; and for Enegrous Corp. as Sr. Principal Antenna Engineer.

Currently Antenna Design and EMI Consulting Engineer.

Some IEEE Publications and USA Patents in R&D

IEEE Conference paper: “Dual-band metamaterial-structured antenna with coplanar waveguide and radial feed stub”, M. Pajovic with team, et al., IEEE Symposium on Antennas and Propagation, Vancouver, Canada, 2015 p g , , ,

Common-Mode Filter for 10-Gb/s Differential Microstrip Lines, M. Pajovic with team, USA patent 8,907,748 B2, 2014.

IEEE Conference paper: “The Gigahertz common-mode filter for differential signal lines”, M. Pajovic with team, et al., IEEE EMC Symposium, Denver, Colorado, 2013, and j , , y p , , , , “Improved Common-Mode Filter for 10-Gb/s Straplines”, M. Pajovic with team, USA Patent

pending. “Gigahertz-range Analysis of Impedance Profiles and Cavity Resonances in Multilayered

planar structures”, M. Pajovic with team, et al., IEEE Transactions on Electromagnetic Compatibility, 2010.

“The Closed-form Equation for Estimating Capacitance of Signal Vias in Arbitrarily Multilayered PCBs”, M. Pajovic with team, IEEE Transactions on Electromagnetic Compatibility, 2008.

HAM Radio Life

Received the first Ham Radio license in 1967, former Yugoslavia, in a high school (50 years ago!) Later, got a personal call sign YU1WK.

Used to be a long time member of Academic HAM Radio Club YU1EXYfrom Belgrade University (well known European Club on Ham-radio bands and in worldwide contests)

Currently (over a decade) the call sign is WA6MP (extra FCC class)

LOW-PROFILE PANEL PATCH ANTENNA ARRAYLOW-PROFILE PANEL PATCH ANTENNA ARRAY For 10 GHz with Gain > +30 dBi

Design concept and HFSS simulation results

16x16 Patch array (256 patches), (16x16) inch

Top view

Stackup for 16x16 patch Array

Array PCB> 1st layer; 16x16 patches, CuDielectric Ro3035 thick 60 milDielectric Ro3035, thick 60 mil

2nd layer; GND plane, CuFeed PCB> 1st layer; GND plane

Dielectric Ro3035 thick 60 milDielectric Ro3035, thick 60 mil 2nd layer; feed network, Cu

Air; thick 10mmEl t i PCB 1st l GND l CElectronic PCB> 1st layer; GND plane, Cu

Dielectrics (?)Electronic components layer

PCB panels and the array assembling

Ro3035 or Ro3003 are commercially graded materialso3035 o o3003 a e co e c a y g aded ate a s(DK=3.6 or 3.0; TD=0.0015 or 0.001)

May be used one panel for two PCBs May be used one panel for two PCBs

The Array assembling is putting together the two PCBs (face-to-face d l )ground planes)

The array element: a wideband patchThe array element: a wideband patch above GND plane with embedded slots

Patch X-Y size:Patch X-Y size: (0.26x0.33) inchGND size: (1x1) inch

Patch Stackup and dielectric materialp

1st layer: Patch1st layer: Patch

RO3035, thick 60-mil

2nd layer: solid GND

RO3035, thick 60-mil

3rd layer: Microstrip feed

S11 31 dB @10 3 GHS11=-31 dB @10.3 GHz

500

0.00Ansoft LLC HFSSDesign1XY Plot 2 ANSOFT

-5.00

Curve InfodB(S(2,2))

Setup1 : Sweep1

Name X Ym1 10.3550 -40.2306m2 10.3100 -31.1384

-25.00dB(S

(2,2

))

m2

-45.00

m1

10.00 10.10 10.20 10.30 10.40 10.50 10.60 10.70 10.80Freq [GHz]

Rad. Pattern with max. Realized Gain=+6.2 dBiRad. Pattern with max. Realized Gain 6.2 dBiin E- and H-plane

10.00Ansoft LLC HFSSDesign1XY Plot 3 ANSOFT

m1Curve Info

0.00

5.00

nTot

al)

-10.00

-5.00

dB(R

ealiz

edG

ai

Name X Ym1 0.0000 6.2155

-9000 -6500 -4000 -1500 1000 3500 6000 8500-20.00

-15.00

90.00 65.00 40.00 15.00 10.00 35.00 60.00 85.00Theta [deg]

3 D Rad Pattern of the patch; Realized G=6 2dBi3-D Rad. Pattern of the patch; Realized G=6.2dBi

Feed and Impedance Matching for 1 patch

The patch impedancetransform from 50 to 100 Ohm by ¼ lambda microstrip transformer

2x2 Patch array with a corporate (parallel) feed2x2 Patch array with a corporate (parallel) feed network and 50-to-100-Ohm transforms

2x2 Patch: S11=-22 dB @ 10.3 GHz at Array input

-5.00

-2.50Ansoft LLC HFSSDesign1XY Plot 5 ANSOFT

Curve Info

-12.50

-10.00

-7.50

3))

Name X Ym1 10.3000 -22.2623

-20.00

-17.50

-15.00dB(S

(3,

10.00 10.10 10.20 10.30 10.40 10.50 10.60 10.70 10.80Freq [GHz]

-25.00

-22.50m1

2x2 Patch; Rad. Pattern with realized G=+12.3 dBi;in E and H plane

10.00

15.00Ansoft LLC HFSSDesign1XY Plot 6 ANSOFT

m1Curve Info

0.00

5.00

ainT

otal

)

-10.00

-5.00

dB(R

ealiz

edG

a

Name X Ym1 0.0000 12.3346

-90.00 -65.00 -40.00 -15.00 10.00 35.00 60.00 85.00Theta[deg]

-20.00

-15.00

Theta [deg]

The corporate network for the 16x16 ArrayThe corporate network for the 16x16 Array

.

Gain calculation for existing and operating

a 8x8 dipole array

The example of 8x8 Dipole Array above a solid ground plane:

8fc 10.3 109

03 108

fc o=29 mm

Nx 8 Ny 8 d 0.9 0 Gel 2.14 3 dBix y 0 el

Garray Gel 10 log 2 Nx Nyd0

Garray 25.75 dBi

(The declaring max gain of an operating8x8 dipole array is 25 dBi)(The declaring max. gain of an operating 8x8 dipole array is 25 dBi)

Estimated Array Gain calculation for

the current 16x16 patch array

fc 10.3 109 0

3 108

f o=29mm c 0 fc

Nx 16 Ny 16 d 0.9 0 Gel 6.2 dBi

Garray Gel 10 log 2 Nx Nyd0

0

Garray 32.8 dBi

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