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| 型號(hào)： | RFEVAL1-SYS |
| 英文描述： | EVALUATION BOARD RF |
| 中文描述： | 評(píng)價(jià)委員會(huì)射頻 |
| 文件頁(yè)數(shù)： | 4/19頁(yè) |
| 文件大?。?/td> | 614K |
| 代理商： | RFEVAL1-SYS |
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DS000023 Ver 1.1 JAN 00
1999 Reg. No. 227 4001, ENGLAND
Page 4
R
ADIO
E
VALUATION
K
IT
RFEVAL1
The following type approved antennas may also be used with the transmitter and the receiver. Note that if an
alternative antenna is to be fitted then remember to remove the connection to the PCB track antenna by
removing the feed capacitor!
ANTENNA 1 – HELICAL COIL (PART NO PU-4BA-433, PU-BNC-433)
Wire coil, connected directly to RF in/out, open circuit at the other end. This antenna has a high Q Factor, for
trimming, the length may be adjusted. This is a popular antenna as it consumes little space. The helical de-
tunes badly with proximity to other conductive objects.
ANTENNA 2 –TUNED LOOP (incorporated on PCB)
A PCB track tuned by the capacitor to ground at the ‘HOT’ end. Fed from ANT pin at a point 20% from the
ground end. Loops have a high immunity to proximity de-tuning. e.g. a human hand used to operate the
transmitter coming into relative close proximity to the loop.
Antenna 3 – Whip (PART NO FLEXI-4BA-433, FLEXI-BNC-433)
Can be either PCB track, wire rod or a combination of the two. One end connected to ANT pin, the other
open. Optimum total length is 17.3cm ( wave @ 433MHz). The optimum position is to locate the antenna so
that it protrudes directly upwards. 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 wave earthed
radial(s) if the product is small and plastic cased.
RF
17.3cm @ 433MHz
RF GND
RF
Loop Antenna Area
4 To 10cm
2
Track Width
1mm
Capacitor 1.5 - 5pF
Fixed or Variable
RF
34 Turns of enamelled copper wire diameter 0.5mm
close wound on 2.5mm diameter former
Helical Coil Antenna
Loop Antenna
Whip Antenna
Figure 1: Antenna Configurations
Advantages / Disadvantages of Each Antenna
Feature
Performance
Ease of design
Size
Immunity to hand de-tuning and or
components in close proximity
Helical
Loop
Whip
Note
: The range achieved from the system is dependent on the choice and position of the antenna. The
space around the antenna is as important as the antenna itself. Try to keep the antenna away from other
metal in the system such as transformers, batteries and PCB tracks, especially ground planes. In particular,
the ‘HOT’ end of the antenna should be kept as far away as possible from these.
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