Electronic Components Datasheet Search |
|
MTX2-458-10 Datasheet(PDF) 8 Page - Radiometrix Ltd |
|
MTX2-458-10 Datasheet(HTML) 8 Page - Radiometrix Ltd |
8 / 10 page Radiometrix Ltd MTX2 Data Sheet page 8 Antenna requirements Three types of integral antenna are recommended and approved for use with the module: A) Whip This is a wire, rod ,PCB track or combination connected directly to RF pin of the module. Optimum total length is 16.4cm (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 B) Helical Wire coil, connected directly to RF pin, 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. C) Loop A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from RF pin at a point 20% from the ground end. Loops have high immunity to proximity de- tuning. Feature A B C whip helical loop Ultimate performance *** ** * Easy of design set-up *** ** * Size * *** ** Immunity proximity effects * ** *** Range open ground to similar antenna 500m 200 100 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. 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 Figure 7: Antenna types |
Similar Part No. - MTX2-458-10 |
|
Similar Description - MTX2-458-10 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |