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BIM2G-434-15-5V Datasheet(PDF) 8 Page - Radiometrix Ltd |
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BIM2G-434-15-5V Datasheet(HTML) 8 Page - Radiometrix Ltd |
8 / 11 page Radiometrix Ltd, BIM2/3G Data Sheet page 8 Three types of integral antenna are recommended: A) Helical Wire coil, connected directly to pin 2, open circuit at other end. This antenna is very efficient given it's small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the wire length or expand the coil for optimum results. The helical de-tunes badly with proximity to other conductive objects. B) Loop A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from pin 2 at a point 20% from the ground end. Loops have high immunity to proximity de- tuning. C) Whip This is a wire, rod, PCB track or combination connected directly to pin 2 of the module. Optimum total length is 15.5cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end well away from metal components to prevent serious de-tuning. Whips are ground plane sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and plastic cased A. Helical antenna B. Loop antenna RF C1 C2 C4 C3 RF-GND C. Whip antenna 16.4cm RF 0.5 mm enameled copper wire close wound on 3.2 mm diameter former 433 MHz = 24 turns Feed point 15% to 25% of total loop length track width = 1mm 4 to 10 cm inside area wire, rod, PCB-track or a combination of these three 433 MHz = 16.4 cm total from RF pin. 2 RF helical loop whip Ultimate performance ** * *** Easy of design set-up ** * *** Size *** ** * Immunity proximity effects ** *** * Range open ground to similar antenna (for BiM2G-433-15) 200m 100m 300m Fig.4: Antenna configuration (BiM2G @ 433.92MHz) Antenna selection chart |
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