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KTX2_12 데이터시트(Datasheet) 6 Page - Radiometrix Ltd

부품명 KTX2_12
상세내용  UHF FM Code-Hopping Data Transmitter Module
PDF  8 Pages
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제조사  RADIOMETRIX [Radiometrix Ltd]
홈페이지  http://www.radiometrix.com
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 6 page
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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.




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