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Número de pieza IA4420
Descripción ISM Band FSK Transceiver
Fabricantes Interation 
Logotipo Interation Logotipo
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IA4420 datasheet

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IA4420 pdf
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
4

5 Page

IA4420 arduino
EUROPEAN ETSI REGULATIONS: 868MHZ AND 434MHZ
The typical free space ranges for the 868 MHz and 434 MHz European unlicensed bands are given in Tables 1.3 & 1.4, respectively.
The cross tapped loop antenna for 868 MHz is identical to that of the 915 MHz bands as the automatic tuning circuitry allows multi-
band operation.
The allowed transmitter ERP is between 7-27 dBm (corresponding to 9.14-29.14 dBm EIRP) at 868 MHz depending on the sub-
channel frequency. The allowed ERP is 10 dBm at 434 MHz (corresponding to 12.14 dBm EIRP).
At 434 MHz the given back IFA TX antenna cannot approach the allowed 10 dB limit. Higher TX ERP and thus range can be achieved
by applying IFA antennas with bigger dimensions or/and higher output current generated by an external booster stage.
The range can also be increased at 868 MHz by booster stages.
868 MHz E.U.
band
TX Xtapped Loop “small”
(see Figs. 2.3)
TX Xtapped Loop “big”
(see Figs. 2.4)
TX Back IFA (see Figs. 2.5)
RX Xtapped loop
“small”
(see Figs. 2.3)
9600 bps
57470 bps
57
9600 bps
114
9600 bps
36 57470 bps 72
57470 bps
RX Xtapped loop
“big”
(see Figs. 2.4)
9600 bps
57470 bps
143 9600 bps 285
85
57470 bps
170
9600 bps
57470 bps
390
246
979
583
RX Back IFA
(see Figs. 2.5)
9600 bps
639
9600 bps
1276
9600 bps
4372
57470 bps
381 57470 bps 760
57470 bps
2604
Table 1.3 Free space range [m] in the 915 MHz European unlicensed band (10-2 BER). The real indoor or outdoor ranges
can be calculated from this data using the calculation method of Appendix E of the IA-ISM-AN1 document.
9

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