IEC 62604-2:2022

IEC 62604-2 ®
Edition 3.0 2022-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Surface acoustic wave (SAW) and bulk acoustic wave (BAW) duplexers of
assessed quality –
Part 2: Guidelines for the use

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IEC 62604-2 ®
Edition 3.0 2022-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Surface acoustic wave (SAW) and bulk acoustic wave (BAW) duplexers of
assessed quality –
Part 2: Guidelines for the use
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.140 ISBN 978-2-8322-5653-4

– 2 – IEC 62604-2:2022 RLV © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
3.1 Response characteristics related terms . 8
3.2 SAW and BAW duplexers related terms . 8
4 Technical considerations . 8
5 Fundamentals of SAW and BAW duplexers. 9
5.1 Basic function . 9
5.1.1 General . 9
5.1.2 TX filter response (filter response from TX port to antenna port) . 10
5.1.3 RX filter response (filter response from antenna port to RX port) . 10
5.1.4 Isolation (isolation from TX port to RX port) . 10
5.2 Basic structure . 11
5.3 Principle of operation . 12
5.4 Diplexer . 17
5.5 Multiplexer . 18
6 SAW and BAW duplexer characteristics . 18
6.1 General conditions for SAW and BAW duplexers . 18
6.2 Typical characteristics of SAW and BAW duplexers . 21
6.2.1 UMTS duplexer . 21
6.2.2 US CDMA duplexer . 21
6.2.3 PCS CDMA duplexer . 22
6.2.4 LTE Band 1 + Band 3 multiplexer. 22
7 Application guidelines . 22
7.1 Power durability . 26
7.2 Harmonics and inter-modulation distortion . 27
7.3 Measurement method for the duplexer . 27
7.4 Electrostatic voltage protection . 29
Bibliography . 30

Figure 1 – Basic duplexer configuration . 9
Figure 2 – Basic TX filter response example of SAW and BAW duplexers . 11
Figure 3 – Basic RX filter response example of SAW and BAW duplexers . 11
Figure 4 – Basic isolation characteristics example of SAW and BAW duplexers . 11
Figure 5 – The block diagram of a duplexer . 13
Figure 6 – Demanded condition of TX part for duplexers . 15
Figure 7 – Phase rotation in TX part . 15
Figure 8 – Demanded condition of RX part for duplexers . 17
Figure 9 – Basic diplexer configuration . 17
Figure 10 – Basic multiplexer configuration . 18
Figure 11 – Typical wide range frequency response of TX filter . 19
Figure 12 – Typical wide range frequency response of RX filter for upper local system . 20

Figure 13 – Phase shifter by microstrip line on the surface of a ceramic package . 20
Figure 14 – Lumped element phase shifter . 21
Figure 15 – Duplexer configuration . 21
Figure 16 – Frequency characteristics of SAW duplexer for UMTS Band 1 system . 23
Figure 17 – Frequency characteristics of a SAW duplexer for US CDMA system . 25
Figure 18 – Frequency characteristics of BAW duplexer for PCS CDMA system . 26
Figure 19 – Frequency characteristics of SAW Band 1 + Band 3 multiplexer for LTE. 26
Figure 20 – Four-port-type network analyzer for duplexer measurement . 28
Figure 21 – Four-port-type network analyzer for measurement of a balanced RX port
duplexer. 29

Table 1 – Frequency allocation for typical LTE frequency division duplex (FDD) bands . 10

– 4 – IEC 62604-2:2022 RLV © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SURFACE ACOUSTIC WAVE (SAW) AND BULK
ACOUSTIC WAVE (BAW) DUPLEXERS
OF ASSESSED QUALITY –
Part 2: Guidelines for the use

FOREWORD
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 62604-2:2017. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 62604-2 has been prepared by IEC technical committee 49: Piezoelectric, dielectric and
electrostatic devices and associated materials for frequency control, selection and detection. It
is an International Standard.
This third edition cancels and replaces the second edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the term "cross-isolation" has been added to Clause 3;
b) multiplexers are described.
NOTE In this document, SAW and BAW duplexers are treated simultaneously because both duplexers are used in
the same manner, especially in mobile phone systems and have the same requirements of characteristics, test
method and so on.
The text of this International Standard is based on the following documents:
Draft Report on voting
49/1361/CDV 49/1376/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
...