application note nodocs.mirifica.eu/globaltop_technology/mediatek_mt3333/...application note no.019...

Application Note no.019 Chip Antenna Series

GPS & Glonass Chip Antenna

ACM4-5036-A1-CC-S

Prepared Checked Approved

Kidd Leeting Yuehbe

We connect We Protect We offer suitable solutions to meet customer’s specific requirements

Innovation、Nature、

People、Advance、Quality

INPAQ Technology Co., LTD

http://www.inpaq.com.tw

TEL :+886-37-585-555

FAX : +886-37-585-511

INPAQ Taiwan TEL:+886-37-585-555 FAX: +886-37-585-511

Application Note no.019 ACM4-5036A1 Rev.A0 08/2011

Application Note no.001


Application Note

GPS & Glonass Chip Antenna – ACM4-5036-A1-CC-S

Revision History: 2011-08-08 Rev.A0

Previous Version :

Page Subjects (major changes since last revision) Version

All Make up all document A0

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ACM4-5036-A1-CC-S Application Note

Catalog

Applications ............................................................................................. 2

Features .................................................................................................. 2

Electrical Characteristic ........................................................................... 2

Antenna Dimension ................................................................................. 2

Recommended PCB Layout .................................................................... 3

Layout Description................................................................................... 4

Performance on Middle of Long Side....................................................... 5

Typical VSWR.......................................................................................... 5

Typical Free Space Efficiency and Peak Gain.......................................... 5

Typical Free Space 3D Radiation Pattern ................................................ 6

Typical Free Space 2D Radiation Pattern ................................................ 6

The Efficiency and Bandwidth for Different Position................................... 7

Peak Gain and Efficiency on Long Side ..................................................... 8

Peak Gain and Efficiency on Short Side .................................................... 8

3D Gain Pattern on Long Side ................................................................... 9

2D Gain Pattern on Long Side(1575 MHz)................................................. 10

2D Gain Pattern on Long Side(1603 MHz) ............................................... 10

3D Gain Pattern on Short Side .................................................................. 11

2D Gain Pattern on Short Side(1575 MHz) ................................................ 12

2D Gain Pattern on Short Side(1603 MHz) ................................................ 12

Mobile Phone Applications......................................................................... 13

PND Applications....................................................................................... 14

Notebook Applications ............................................................................... 16

Contact Information ................................................................................... 17

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Applications

This antenna is designed for GPS & Glonass application and it’s suitable for cellular

phones, PDA, notebook, navigator, and all devices which have GPS function.

Features

Electrical Characteristics

Electrical Specification*

ITEM GPS Glonass

Frequency Band 1570 MHz〜1580 MHz 1593 MHz〜1615MHz

VSWR < 2 <2

Polarization Linear Linear

Impedance 50Ω typ. 50Ω typ.

Central Frequency 1575 MHz 1604 MHz

*Peak Gain

(at 1575 MHz / 1603 MHz) 3.18 dBi 3.25 dBi

*Peak Efficiency

(at 1575 MHz / 1603 MHz ) 77.90% 78.85 %

* Electrical characteristic depends on INPAQ evaluation board with matching circuit.

* The dimension of evaluation board is 80 x 40mm with 15x6.3mm clearance area.

Antenna Dimension (unit:mm)

Chip Antenna L W A B L1 W1 H

ACM4-5036 5.2±0.3 3.7±0.3 0.45±0.25 0.45±0.25 1.1±0.20 0.55±0.20 0.70±0.15

‧Omni-directional radiation

‧High Efficiency

‧Low profile and compact size(5.2 x 3.7 x 0.7mm)

‧Low cost

‧Lead free soldering compatible

‧RoHS compliant

‧Tape and reel packing

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Recommended PCB layout(unit:mm)

Terminal name Terminal Dimensions

Feed 1.1 X 0.55

GND 3.7 X 0.45

GND 3.7 X 0.45

Terminal name Terminal Dimensions

Pad (Feed) 1.2 X 0.75

Pad (GND) 3.8 X 1.15

Pad (GND) 3.8 X 1.15

Ground

Feed line 50Ω

Matching Circuit

componen

Pad (GND)

Pad (Feed)

Pad (GND)

Clearance Area

(15 x 6.3 mm)

) *The slot is used for tuning frequency,

and can be eliminated in real application.

Slot

PCB pad

dimensions

Antenna pad

dimensions

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Layout Description

F. Feeding Pad

The signal from system must feed into the feeding pad.

G. Ground Pad

This pad must connect to ground plane of PCB.

C. Clearance Area

To achieve antenna performance, the clearance area is necessary and all metallization

should be removed from all PCB layers.

M. Matching Circuit

Please keep the pads for PI-matching circuit to reduce return loss and shift the band to

meet GPS application.

ACM4 5036

Matching Circuit

Customer’s Platform

GPS Chip Set

F

G

C

M

G

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Performance on Middle of Long Side

Typical VSWR

Typical Free Space Peak Gain and Efficiency

Frequency (MHz) Peak Gain (dBi) Efficiency (%)

1570 3.08 74.00

1575 3.18 77.90

1580 3.29 80.89

1593 3.30 82.35

1604 3.25 78.85

1615 3.24 75.81

Frequency

(MHz) VSWR

1570 1.29

1575 1.22

1580 1.17

1593 1.18

1604 1.35

1615 1.56

Peak Gain

Efficiency

-5.0

-3.0

-1.0

1.0

3.0

5.0

1570 1575 1580 1585 1590 1595 1600 1605 1610 1615

Frequency (MHz)

Pe

ak

Ga

in (

dB

i)

0.0

20.0

40.0

60.0

80.0

100.0

1570 1575 1580 1585 1590 1595 1600 1605 1610 1615

Frequency (MHz)

Eff

icie

ncy (%

)

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Typical Free Space Radiation Pattern

3D Radiation Pattern

Typical Free Space Radiation Pattern

2D Radiation Pattern(1575 MHz & 1604 MHz)

Location A

1575 MHz 1604 MHz

X-Y Plane

1575 MHz

X-Z Plane Y-Z Plane

Antenna

Antenna Antenna

Y

X

Z

X

Y

Z

X Y

Z

X Y

Z

-7-




The Efficiency and Bandwidth for Different Location

* All electrical characteristic depend on INPAQ 80 x 40mm evaluation board with matching circuit.

Locations Long side Short side

Test ltem A B C D E F

Frequency (MHz) 1575 1604 1575 1604 1575 1604 1575 1604 1575 1604 1575 1604

Bandwidth (MHz)

[VSWR<2] 101 30 43 28 29 25

Linear Peak 3.18 3.25 1.3 1.09 2.17 2.31 -1.16 -0.44 0.3 0.01 0.70 0.67 Gain

(dBi) Avg. -1.08 -1.03 -2.87 -2.97 -2.23 -1.95 -3.98 -3.14 -3.14 -3.39 -3.58 -3.64

Linear Efficiency

(%) 77.9 78.85 51.59 50.51 59.79 63.82 42.58 44.2 48.51 45.86 43.83 43.28

*Keep the antenna away from the PCB edge about 5mm.

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Peak Gain and Efficiency on Long Side

Peak Gain and Efficiency on Short Side

Location

-3.0

-1.0

1.0

3.0

5.0

1570 1575 1580 1585 1590 1595 1600 1605 1610 1615Frequency (MHz)

Pe

ak

Ga

in (

dB

i)

Location ALocation ALocation ALocation A Location BLocation BLocation BLocation B Location CLocation CLocation CLocation C0.0

20.0

40.0

60.0

80.0

100.0

1570 1575 1580 1585 1590 1595 1600 1605 1610 1615Frequency (MHz)

Eff

icie

nc

y (

%)

Location ALocation ALocation ALocation A Location BLocation BLocation BLocation B Location CLocation CLocation CLocation C

-5.0

-3.0

-1.0

1.0

3.0

5.0

1570 1575 1580 1585 1590 1595 1600 1605 1610 1615Frequency (MHz)

Pe

ak

Ga

in (

dB

i)

Location DLocation DLocation DLocation D Location E Location E Location E Location E Location FLocation FLocation FLocation F0.0

20.0

40.0

60.0

80.0

100.0

1570 1575 1580 1585 1590 1595 1600 1605 1610 1615

Frequency (MHz)

Eff

icie

nc

y (

%)

Location DLocation DLocation DLocation D Location E Location E Location E Location E Location FLocation FLocation FLocation F

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3D Gain Pattern on Long Side

Location A

1575 MHz 1604 MHz

Location B

1575 MHz 1604 MHz

Y

X

Z

X

Y

Z

X Y

Z

X Y

Z

X

Y

Z

X

Y

Z

X Y

Z

X Y

Z

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2D Gain Pattern on Long Side (1575 MHz)

2D Gain Pattern on Long Side (1604 MHz)

Location C

1575 MHz 1604 MHz

X-Y plane Y-Z plane

Antenna Antenna Antenna is in back

X-Y plane X-Z plane Y-Z plane

Antenna Antenna is in back

X Y

Z

X

Y

Z

X

Y

Z

X-Z plane

Antenna

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3D Gain Pattern on Short Side

Location D

1575 MHz 1604 MHz

Location E

1575 MHz 1604 MHz

X

Y

Z

X

Y

Z

X Y

Z

X Y

Z

X Y

Z

X

Y

Z

X

Y

Z

X Y

Z

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2D Gain Pattern on Short Side (1575 MHz)

2D Gain Pattern on Short Side (1604 MHz)

Location F

1575 MHz 1604 MHz


Antenna Antenna Antenna is in back


Antenna Antenna is in back Antenna

X Y

Z

X Y

Z

X

Y

Z

X

Y

Z

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Mobile Phone Applications

- For the mobile phone applications, because most of the key components are arranged

along the long side of the PCB, there is no space to place our antenna. So we move the

antenna to top edge of PCB as showed as follow picture. And the impedance of PCB in

top edge is smaller than in long side edge, we get narrower bandwidth and lower

performance than in long side of PCB. But we still get a workable performance by

arranging antenna and components in a reasonable position.

Symbol Suggested Distance Remark

S ≧5mm The distance between PCB edge and antenna edge

D ≧1mm The distance between antenna and receiver(or

shielding case)edge

G ≧1mm The edge of display must keep away 1mm from

antenna edge.

Receiver Camera Screw Screw

Display

Clearance area

15X6.3 mm

S

D

Ant.

INPAQ

G

ACM4 5036

D

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PND Applications

- For the PND or Navigator applications, GPS antenna usually place at the long side of

PCB. To make the device thinner, it usually cut a part of PCB to put the battery in it and

result in a shorter PCB than mobile phone application. In order to increase the

performance of GPS antenna, we suggest to keep some part of PCB to make it look as

L-shape as figure E. However, the distance between panel and PCB will affect the

antenna performance, we suggest keep the panel away from antenna edge at least 3mm

in distance as Figure F.

Front Side

Extending PCB

PCB Battery

Figure E. Make the extending PCB to get the better performance

Ant

GPS

PCB

Ant.

Clearance area

15X6.3 mm

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P ≧1mm The edge of display must keep away 1mm from

antenna edge.

G ≧3mm The distance between antenna and panel metal

Battery

Shielding

Case

Back Side

Panel (at front side)

P

PCB

Panel

Ant

G

Figure F. Keep the panel away from the PCB more than 3mm.

Ant.

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Notebook Applications

- For the notebook applications, the space is too small to place a larger PCB. As we know,

the smaller PCB we have, the worst antenna performance we get. But according to

characteristic of this antenna, because the radiation efficiency depends on the size of the

metal layer, so we can extend metal layer from PCB to panel by using copper foil. And if

the radiation plane can be extended to metal of panel, the PCB size becomes a minor

factor of antenna performance; it means we can use smaller PCB to get the similar

performance. By the way, the cable which connects from PCB to main board must fix

along the edge of display, and shorter cable will get the better performance due to its

cable loss.


D ≧1mm The distance between GPS Module and the edge of

panel.

Netb

GPS Module

Camera

Module

LNA Module (with shielding case coving it)

D

Display

Copper Foil

Connecting to PCB and display

Clearance Area

Ground

ACD5036

-17-




Contact Information

INPAQ Technology Co, LTD

Taiwan Chunan

ADD: No.11, Ke-Yi St., Chunan, Miaoli 35059, Taiwan (R.O.C.)

TEL : +886-37-585-555

FAX : +886-37-585-511

E-Mail : [email protected]

Web site : http://www.inpaq.com.tw

USA Office

ADD: 21 Echo Brook Road, Rochester, NH 03839, U.S.A.

TEL:+1-603-332-6222

FAX:+1-603-509-2900

Korea Office

ADD: 221 Raemian Seocho Univill, 1445-4, Secho-Dong, Secho_gu, Seoul, Korea

130-070

TEL:+82-2-584-8959

FAX:+82-2-584-8951

application note nodocs.mirifica.eu/globaltop_technology/mediatek_mt3333/...application note no.019...

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