Datasheet > RDL2_12

RDL2_12

更新时间： 2022-03-19 14:14:38

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RADIOMETRIX		/
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描述
UHF Multi Channel Wide Band FM Transceiver

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RDL2_12 数据手册

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 16cm (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

C) Loop

Feature

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.

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.

whip

***

helical

***

loop

***

Ultimate performance

Easy of design set-up

Size

Immunity proximity effects

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.

0.5 mm enameled copper wire

close wound on 3.2 mm diameter former

433 MHz = 24 turns

A. Helical antenna

Feed point 15% to 25% of total loop length

track width = 1mm

RF-GND

4 to 10 cm inside area

B. Loop antenna

16.4cm

wire, rod, PCB-track or a combination

of these three

433 MHz = 16.4 cm total from RF pin.

C. Whip antenna

Figure 4: Antenna types

Radiometrix Ltd

RDL2 Data Sheet

page 6

1...3 4 567

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