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www.DataSheet4U.com
IA ISM-AN6
heet4U.comAntenna Selection Guide for the
SIA4420 ISM Band FSK Transceiver
ata Application Note
.D Version 1.0r - PRELIMINARY
wwwIA ISM-AN6 Rev 1.0r 1205
www.DataSheet4U.com©2005, Integration Associates, Inc.

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Integration Associates, Inc.
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Mountain View, California 94041
Tel: 650.969.4100
Fax: 650.969.4582
www.integration.com
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Application Note: Antenna Selection Guide for the IA4420 ISM Band FSK
Transceiver
Version 1.0r - Preliminary
Revision Date: December 15, 2005
The information is provided “as is” without any express or implied warranty of any kind, including warranties
of merchantability, non-infringement of intellectual property, or fitness for any particular purpose. In no
event shall Integration Associates, Inc., or its suppliers be liable for any damages whatsoever arising out of
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these materials. Integration Associates, Inc., may make changes to these materials, or to the products
described w/ithin, at any time, without notice.
© 2005 Integration Associates, Inc. All rights reserved. Integration Associates is a trademark of Integration
Associates, Inc. All trademarks belong to their respective owners.
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ABOUT THIS GUIDE
The antenna selection guide for the IA4420 ISM Band FSK Transceiver is designed to give product designers a quick time-to-market
approach for on-board antenna selection. The guide is designed to address geographic regulations covering the standard ISM FSK
band frequencies; 315MHz, 434MHz, 868MHz, and 915MHz and to address the approximate range-versus-bandwidth to given
antenna pairs.
For further information on the devices used in this publication, see the following datasheets:
IA4420 Universal ISM Band Transceiver datasheet: IA4420-DS
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TABLE OF CONTENTS
About this Guide........................................................................................................................................................................................ 2
Introduction............................................................................................................................................................................................... 5
DESCRIPTION .........................................................................................................................................................................................5
1. Antenna Pairs and Ranges................................................................................................................................................................... 6
U.S. REGULATIONS: 915MHZ, 434MHZ...............................................................................................................................................7
Table 1.1 Free space range [m] in the 915 MHz U.S. unlicensed band.....................................................................................7
Table 1.2 Free space range [m] in the 434 MHz U.S. unlicensed band......................................................................................8
EUROPEAN ETSI REGULATIONS: 868MHZ AND 434MHZ ...................................................................................................................9
Table 1.3 Free space range [m] in the 915 MHz European unlicensed band ............................................................................9
Table 1.4 Free space range [m] in the 434 MHz European unlicensed band ......................................................................... 10
BER VS. RANGE CURVES FOR THE U.S. 915MHZ BAND................................................................................................................... 11
Fig. 1.1........................................................................................................................................................................................... 11
Fig. 1.2........................................................................................................................................................................................... 11
Fig. 1.3........................................................................................................................................................................................... 12
Fig. 1.4........................................................................................................................................................................................... 13
Fig. 1.5........................................................................................................................................................................................... 13
Fig. 1.6........................................................................................................................................................................................... 14
Fig. 1.7........................................................................................................................................................................................... 15
Fig. 1.8........................................................................................................................................................................................... 15
Fig. 1.9........................................................................................................................................................................................... 16
BER VS. RANGE CURVE FOR THE U.S. 434MHZ BAND..................................................................................................................... 17
Fig. 10............................................................................................................................................................................................ 17
BER VS. RANGE CURVES FOR THE E.U. 868MHZ BAND................................................................................................................... 18
Fig. 1.11. ....................................................................................................................................................................................... 18
Fig. 1.12. ....................................................................................................................................................................................... 18
Fig. 1.13. ....................................................................................................................................................................................... 19
Fig. 1.14. ....................................................................................................................................................................................... 20
Fig. 1.15. ....................................................................................................................................................................................... 20
Fig. 1.16 ........................................................................................................................................................................................ 21
Fig. 1.17. ....................................................................................................................................................................................... 22
Fig. 1.18. ....................................................................................................................................................................................... 22
Fig. 1.19. ....................................................................................................................................................................................... 23
BER VS. RANGE CURVES FOR THE E.U. 434MHZ BAND................................................................................................................... 24
Fig. 1.20. ....................................................................................................................................................................................... 24
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2. Antenna Layouts ................................................................................................................................................................................ 25
915 MHZ BAND .................................................................................................................................................................................. 26
915/868 MHz cross tapped loops:................................................................................................................................................... 26
Fig. 2.3a. 915-868 MHz cross tapped loop antenna: the “small” type. .................................................................................... 26
Fig. 2.3b. 915-868 MHz cross tapped loop antenna, “small” type: top and bottom layer (top view) ..................................... 26
Fig. 2.3c. 915-868 MHz cross tapped loop antenna, “small” type: zoomed antenna RF feeding points on top layer
and DC feeding point on bottom layer......................................................................................................................................... 27
Fig. 2.3d. 915-868 MHz cross tapped loop antenna, “small” type: zoomed picture of printed capacitor top and
bottom (top view) layers. .............................................................................................................................................................. 27
Fig. 2.4a. 915-868 MHz cross tapped loop antenna: the “big” type. ........................................................................................ 28
Fig. 2.4b. 915-868 MHz cross tapped loop antenna, “big” type: top layer and bottom layer (top view)................................. 28
Fig. 2.4c. 915-868 MHz cross tapped loop antenna, “big” type: zoomed antenna RF feeding points on top layer
and DC feeding point on bottom layer......................................................................................................................................... 29
Fig. 2.4d. 915-868 MHz dual band cross tapped loop antenna, “big” type: zoomed picture of printed capacitor top
and bottom (top view) layers........................................................................................................................................................ 29
915MHz BIFA:..................................................................................................................................................................................... 30
Fig. 2.5a. 915 MHz BIFA antenna. Top layer . ............................................................................................................................ 30
Fig. 2.5b. 915 MHz BIFA antenna. Bottom layer (top view) and zoomed antenna RF feeding points on top layer ................ 30
Fig. 2.5c. 915 MHz BIFA antenna. Zoomed picture of antenna DC feeding on the bottom (top view) layer........................... 31
868 MHz BAND................................................................................................................................................................................... 32
915/868 MHz cross tapped loops:................................................................................................................................................... 32
868MHz BIFA:..................................................................................................................................................................................... 32
Fig. 2.6a. 868 MHz BIFA antenna. Top layer . ............................................................................................................................ 32
Fig. 2.6b. 868 MHz BIFA antenna. Bottom layer (top view) and zoomed antenna RF feeding points on top layer ................ 32
Fig. 2.6c. 868 MHz BIFA antenna. Zoomed picture of antenna DC feeding on the bottom (top view) layer........................... 33
434 MHz BAND................................................................................................................................................................................... 34
434MHz cross tapped loop: .............................................................................................................................................................. 34
Fig. 2.7a. 434 MHz cross tapped loop antenna. ........................................................................................................................ 34
Fig. 2.7b. 434 MHz cross tapped loop antenna. Top and bottom layer (top view) . ................................................................. 34
Fig. 2.7c. 434 MHz cross tapped loop antenna. Zoomed picture of antenna RF feeding points on the top layer and
DC feeding on bottom layer ......................................................................................................................................................... 35
Fig. 2.7d. 434 MHz cross tapped loop antenna. Zoomed picture of printed capacitor top and bottom (top view)
layers . ........................................................................................................................................................................................... 35
Appendix.................................................................................................................................................................................................. 36
APPENDIX A......................................................................................................................................................................................... 36
EIRP and sensitivity for IA4420 with alternate antennas........................................................................................................... 36
APPENDIX B ........................................................................................................................................................................................ 38
Fig B.1. .......................................................................................................................................................................................... 38
Fig B.2. .......................................................................................................................................................................................... 38
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