HTRM800SLASHEED datasheet(13/20 Pages) PHILIPS

13 / 20 page

2001 Oct 04

Philips Semiconductors

Product speciﬁcation

HITAG long range reader module

hardware

HTRM800 family

10.4

Possible sources of errors by connecting the

HTRM800

The following error list should be checked if any error

(e.g. read or write distances that do not reach the specified

values) occurs:

• Power supply cable not mounted correctly

• Power supply voltage not in the specified range

• Serial interface not connected correctly

• Interference received by the antenna because of an

external noise source (e.g. monitor, keyboards); the

remedial measure is to remove the antenna from the

interfering area and use the command StartFFT

• Connecting cables of the antenna changed by mistake

• Antenna is mounted in metal environment; the remedial

measure is to mount a non-metal space keeper between

the antenna and the metal

• Antenna is not designed following the antenna design

instructions

• Inductance of the antenna is not in the specified range

• Quality factor of the antenna is not in the specified

range.

10.5

Building HITAG long range antennas

10.5.1

BASICS

The exact way how to design a HITAG long range antenna

is described in application note

“Antenna Design for the

HITAG Long Range System”.

The antenna is an important part of the HITAG long range

system. The antenna must provide energy and data

transmission between the reader module and transponder.

Therefore, you should be particularly careful when

implementing the antenna in order to achieve optimum

results.

The equivalent circuit of the antenna is shown in Fig.6.

The requirements of the antenna coil are:

• Quality factor: Q = 30 to 60

where

Xs = effective series reactance

Rs = effective series resistance

• Inductance: L = 400 to 1200 µH.

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handbook, full pagewidth

VOLTAGE

LIMITER

coax cable

MGU421

antenna

HTRM800

Fig.6 Basics of the long range antenna.

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