diff --git a/doc/app_notes/openwifi-iq-loopback.jpg b/doc/app_notes/openwifi-iq-loopback.jpg new file mode 100644 index 0000000..365910a Binary files /dev/null and b/doc/app_notes/openwifi-iq-loopback.jpg differ diff --git a/doc/app_notes/openwifi-loopback-principle.jpg b/doc/app_notes/openwifi-loopback-principle.jpg new file mode 100644 index 0000000..6388963 Binary files /dev/null and b/doc/app_notes/openwifi-loopback-principle.jpg differ