Leeting David Tsai David Tsai Guide.pdf · GPS Chip Antenna – ACD-5036-A3-CC-S Revision History: 2009-07-02 Rev.A1 Previous Version : Page Subjects (major changes since last revision)

Application Note no.003 Chip Antenna Series

GPS Chip Antenna

ACD-5036-A3-CC-S

Prepared Checked Approved

Leeting David Tsai David Tsai

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.003ACD5036A3 Rev.A1 07/2009

INPAQ Technology Co., LTD

Application Note

GPS Chip Antenna – ACD-5036-A3-CC-S Revision History: 2009-07-02 Rev.A1 Previous Version : Page Subjects (major changes since last revision) Version

All Make up all document A0 2 Revise recommended PCB layout A1

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ACD-5036-A3-CC-S Application Note

Catalog

Applications............................................................................................... 1

Features.................................................................................................... 1

Electrical Characteristic ............................................................................ 1

Antenna Dimension................................................................................... 1

Recommended PCB Layout ..................................................................... 2

Layout Description .................................................................................... 3

Performance on Middle of Long Side........................................................ 4

Typical VSWR ........................................................................................... 4

Free Space Efficiency and Peak Gain....................................................... 4

Typical Free Space 3D Radiation Pattern ................................................. 5

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

3D Gain Pattern on Short Side ................................................................... 10

2D Gain Pattern on Long Side .................................................................... 11

2D Gain Pattern on Short Side ................................................................... 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 application and it’s suitable for cellular phones, PDA, notebook, navigator, and all devices which have GPS function.

Features

Electrical Characteristics

Electrical Specification* Center Frequency 1575.42MHz Frequency Range 1550MHz~1600MHz (S11≦ -10dB)*

Polarization Linear Pattern Omni-Directional

Ref. Impedance 50 ohm Peak Gain 3.40 dBi (typ.)@1575.42MHz

Efficiency [%]/[dB] 83.1% / 0.13 dBi (typ.)@1575.42MHz Size 5.2mm x 3.7mm x 0.7mm

* 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

ACD5036A3 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

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 Antenna pad

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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.

ACD5036

MatchingCircuit

Customer’s Platform GPS Chip Set

F

G

C

M

G

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Performance on Middle of Long Side

Typical S11

Typical Free Space Peak Gain and Efficiency

Frequency Peak Gain Efficiency 1570 MHz 3.57 dBi 86.56 1575 MHz 3.40 dBi 83.10 1580 MHz 3.19 dBi 81.49

Frequency S11 1575 MHz -24.77 1518 MHz -10.00 1623 MHz -10.00

Peak Gain

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

4.0

1500 1520 1540 1560 1571 1573 1575 1576 1578 1580 1600 1620 1640

Frequency [MHz]

Pea

k G

ain

[dB

i]

Radiation Efficiency

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

1500 1520 1540 1560 1571 1573 1575 1576 1578 1580 1600 1620 1640

Frequency [MHz]

Eff

icie

ncy

[%

]

Efficiency

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Typical Free Space Radiation Pattern 3D Radiation Pattern

1570 MHz 1575 MHz

1580 MHz

X Y

Z

X Y

Z

X Y

Z

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Typical Free Space Radiation Pattern 2D Radiation Pattern(1575 MHz)

X-Y Plane X-Z Plane

Y-Z Plane

Antenna

Antenna

Antenna is in back

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The Efficiency and Bandwidth for Different Location * All electrical characteristic depend on INPAQ 80 x 40mm evaluation board with matching circuit.

Long side Short side Locations Test Item A B C D E F

Bandwidth [MHz] S11<-10 104 33 42 23 22 20

Peak 3.40 1.35 2.32 0.08 0.35 -0.46 Gain Linear

[dBi] Avg. 0.13 -2.08 -1.31 -2.57 -2.75 -2.74

Efficiency Linear [%] 83.1 55.8763.31 55.9953.75 53.94

*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

Antenna Peak Gain

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

4.0

1500 1520 1540 1560 1571 1573 1575 1576 1578 1580 1600 1620 1640

Frequency [MHz]

Pea

k G

ain [

dBi]

Location A Location B Location C


0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

1500 1520 1540 1560 1571 1573 1575 1576 1578 1580 1600 1620 1640

Frequency [MHz]

Eff

icie

ncy

[%

]

Location A Location B Location C

Antenna Peak Gain

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

4.0

1500 1520 1540 1560 1571 1573 1575 1576 1578 1580 1600 1620 1640

Frequency [MHz]

Pea

k G

ain [

dBi]

Location D Location E Location F


0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

1500 1520 1540 1560 1571 1573 1575 1576 1578 1580 1600 1620 1640

Frequency [MHz]

Eff

icie

ncy

[%

]

Location D Location E Location F

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3D Gain Pattern on Long Side(1575 MHz)

Location A Location B

Location C

X Y

Z

X Y

Z

X Y

Z

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3D Gain Pattern on Short Side

Location D Location E

Location F

X Y

Z

X Y

Z

X Y

Z

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2D Gain Pattern on Long Side(1575 MHz)

X-Y plane X-Z plane

Y-Z plane

Antenna

Antenna

Antenna is in back

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2D Gain Pattern on Short Side(1575 MHz)

X-Y plane X-Z plane

Y-Z plane

Antenna

Antenna

Antenna is in back

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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

ACD5036

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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Symbol Suggested Distance Remark

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.

Symbol Suggested Distance Remark

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

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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

Documents

Leeting David Tsai David Tsai Guide.pdf · GPS Chip Antenna – ACD-5036-A3-CC-S Revision History: 2009-07-02 Rev.A1 Previous Version : Page Subjects (major changes since last revision)