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diff --git a/3.Docs/C99727_AN2051-245_2017-03-29.PDF b/3.Docs/C99727_AN2051-245_2017-03-29.PDF
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+AN2051 Multilayer Chip Antenna
+
+Application : Bluetooth, 2.4 GHz WLAN, ….
+
+Key Features
+
+y Light weight and low profile
+   5.1mm(L)×2.0mm(W)×1.2mm(H)
+
+y Omni-directional in azimuth
+y Lead (Pb) Free
+
+Return Loss                            Radiation Pattern
+
+                                                        AN2051 H‐Plane
+
+Quick Reference Data                   AN2051 E‐Plane
+                                                              Jun, 2006
+        Item           Specification
+Center Frequency         2.45 GHz
+Bandwidth (typ.)         110 MHz
+Peak Gain (typ.)           0.5 dBi
+                         2.0 (max)
+      VSWR                 Linear
+   Polarization
+                     Omni-directional
+      Pattern               50 Ω
+    Impedance
+
+RainSun Corporation  www.rainsun.com
+
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