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