công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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KTX2 bảng dữ liệu(PDF) 6 Page - Radiometrix Ltd |
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KTX2 bảng dữ liệu(HTML) 6 Page - Radiometrix Ltd |
6 / 8 page Radiometrix Ltd, KTX2 Data Sheet page 6 Antenna requirements Three types of integral antenna are recommended and approved for use with the module: 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 Fig.5: Antenna configuration Feature A B C helical loop whip Ultimate performance ** * *** Easy of design set-up ** * *** Size *** ** * Immunity proximity effects ** *** * Range open ground to similar antenna (for KTX2-433 & RX2A-433-10) 200m 100m 300m Antenna selection chart 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 The antenna choice and position directly controls the system range. Keep it clear of other metal in the system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an internal antenna must be used try to keep it away from other metal components, particularly large ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the antenna itself. |
Số phần tương tự - KTX2_12 |
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Mô tả tương tự - KTX2_12 |
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