Confidential Antenna Design Guide AF 816M157502 Ver. 1.1 Confidential 1.5GHz: AF 816M157502 PCB (GND) Keep out area (No GND Area) Recommended Size Keep Out Area 5 x 13 mm (65m㎡) or more （No GND Area) (Larger area provides the better performance.) Antenna Layout Corner of PCB Radiation Pattern Normal (Omni) 1.5GHz Helical Monopole Antenna AF 816M157502 ■Shapes L= W= T= Actual data ■Feature 8.0 ± 0.2 mm 1.6 ± 0.2 mm 1.6 ± 0.2 mm Confidential ( for GPS ) Efficiency : -1.8dB ( 65%) Peak Gain : 2.8dBi * Small * High Performance * Linear Polarization @1575MHz -0.2dBic (circular polarization) Average Gain : -0.6dBi (ZX plane-Vertical polarization) -3.4dBic (ZX plane-RHCP) ■VSWR ■Electrical Characteristics 11 ( 65%) *on Taiyo Yuden’s Evaluation Board Peak gain ( 76.5 x 10 mm ) Average XY-plane *Element-GND Distance : 5.5 mm gain YZ-plane ZX-plane (-Y) unit: dBi (+X) 2.8 [dBi] -3.6 -10.3 -2.6 -34.2 -11.9 -0.6 LC RC LC RC LC RC -0.2 [dBic] -5.7 -5.8 -5.5 -5.6 -3.2 -3.4 LC=Left-handed circular polarization RC=Right-handed circular polarization 8 7 6 5 4 3 2 1 1325 1575 Frequency [MHz] XY-plane YZ-plane ZX-plane +Z +Z +Z linear polarization (TX-H,TX-V) 5 (-X) -5 -15 -25 -35 -45 TX-H TX-V TX-H TX-V TX-H TX-V TX-H=Horizontal polarization TX-V=Vertical polarization ■Radiation Pattern Bandwidth: 180MHz (VSWR<2) linear polarization circular polarization 10 -1.8 9 @1575MHz Efficiency [dB] circular polarization linear polarization (LC,RC) (TX-H,TX-V) circular polarization linear polarization (LC,RC) (TX-H,TX-V) +Y +X 5 -5 -15 -25 -35 -45 (+Y) (-Y) unit: dBic unit: dBi 5 (+Z) -5 -15 -25 -35 -45 (-Z) 5 -5 -15 -25 -35 -45 (+Y) (+X) unit: dBic unit: dBi 5 (+Z) -5 -15 -25 -35 -45 (-Z) @1575MHz circular polarization (LC,RC) +Y +X 1825 +Y +X 5 -5 -15 -25 -35 -45 (-X) unit: dBic AF 816M157502 Confidential (for GPS) 2. Recommended Land Pattern 8 1. External Dimensions Unit : mm Confidential Recommended Design 3. Recommended 3-1. Recommended Pattern Pattern Layout Layout Design Design 0.5mm or more. 3mm or more. 0.5mm 0.5mm ANT GND 5mm or more. Feed Line 0.5mm width No Ground Area There should be no ground whatsoever within the antenna mounting area (within the red dotted line) including inner layer. ◎Our recommendation is mounting position had better on the corner of PCB. 50ΩInput Matching circuit (1005 chip : (HK1005 , EVK105) Confidential Recommended Design 3-2. Precautions Ⅰ. Surface GND layer around the antenna area should be connected with inner GND layer via through hole. Ⅱ. Matching circuit line should be designed as 50Ω. Ⅲ. Thickness of PCB can be flexible. Ⅳ. Matching circuit should be placed as close as possible to the antenna. Ⅴ. Use of Taiyo Yuden HK1005 and EVK105 series as matching components are highly recommended for the optimized result. Ⅵ. Matching values may be required to get readjusted contingent upon the condition such as proximity to the metal and/or chassis, board size, etc. Recommended land pattern Example of through hole Land for input terminal Land for NC terminal ※1 Do not arrange the surface and inside of layer pattern near the antenna mounting area. （Refer to our company evaluation circuit board） ※2 A solder area is set at solder resist. Unit : mm Land for matching circuit （1005 chip） 50Ω Input GND Confidential Metal approach 3-3. Metal avoidance area Please do not set close to a metal housing, paint including the metal, board GND, the metal chassis,etc. Front or Back Side