ETS-Lindgren 3148, 93148 User Manual

Model 3148 & 93148

Log-Periodic Dipole

Array Antenna

MANUAL

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 REV C – PN 399239

MODEL 3148 LOG-PERIODIC DIPOLE ARRAY ANTENNA

EMC Test Systems, L.P. reserves the right to make changes to any products herein to improve functioning,
design, or for any other reason. Nothing contained herein shall constitute EMC Test Systems, L.P.
assuming any liability whatsoever arising out of the application or use of any product or circuit described
herein. EMC Test Systems, L.P. does not convey any license under its patent rights or the rights of others.

© Copyright 2002 by EMC Test Systems, L.P. All Rights Reserved.

No part of this document may be copied by any means

without written permission from EMC Test Systems, L.P.

E-MAIL & INTERNET

[e-mail]
http://www.ets-lindgren.com

USA

1301 Arrow Point Dr., Cedar Park, TX 78613
P.O. Box 80589, Austin, TX 78708-0589
Tel [phone] Fax [phone]

FINLAND

Euroshield OY
Mekaanikontie 1
27510, Eura, Finland
Tel [phone]
Fax [phone]

SINGAPORE

Lindgren RF Enclosures Asia-Pacific
87 Beach Road
#06-02 Chye Sing Building
Singapore 189695
Tel [phone] Fax [phone]

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002
REV C – PN 399239

MODEL 3148 LOG-PERIODIC DIPOLE ARRAY ANTENNA

Table of Contents

INTRODUCTION.................................................................................................................................. 1

STANDARD CONFIGURATION......................................................................................................... 2

OPTIONS............................................................................................................................................... 2

MOUNTING INSTRUCTIONS............................................................................................................. 3

ANTENNA SUPPORTS .............................................................................................................................3

EMISSIONS AND IMMUNITY............................................................................................................ 4

APPLICATION...................................................................................................................................... 5

TYPICAL DATA....................................................................................................................................7

SPECIFICATIONS.............................................................................................................................. 10

ELECTRICAL ....................................................................................................................................... 10

PHYSICAL ........................................................................................................................................... 10

MAINTENANCE................................................................................................................................. 10

WARRANTY........................................................................................................................................ 11

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002
REV C – PN 399239

MODEL 3148 LOG-PERIODIC DIPOLE ARRAY ANTENNA

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002
REV C – PN 399239

MODEL 3148 LOG-PERIODIC DIPOLE ARRAY ANTENNA Introduction

INTRODUCTION

The ETS-Lindgren Model 3148 Log Periodic Dipole Array is a
linearly polarized, broadband antenna designed to operate over the
frequency range of 200 MHz to 2 GHz. The choice of scaling
factors, the various diameters of each element, and the center-to
center spacing of the booms are such that excellent VSWR
characteristics are obtained throughout the operating frequency
range (See Model 3148 VSWR data in the “Typical Data” section
of this manual). The precise design of the feed and positioning of
the elements on the boom yield optimum phase relationship. This
causes the active region, at any given frequency, to propagate RF
energy towards the smaller elements leaving the elements behind it
electrically dead.

The Model 3148 antenna fully satisfies CISPR-16 cross­polarization rejection requirement, and has better than 20 dB cross­polarization rejection below 1000 MHz. The constant gain of the
antenna yields an antenna factor which varies linearly with
frequency as shown in the “Typical Data” section of this manual.
The variation is smooth; therefore, accurate interpolation of
performance between specified frequency points is simple.

The Model 3148 Log-Periodic antenna is constructed of
lightweight, corrosion-resistant aluminum, providing years of
trouble-free indoor and outdoor service.

The antenna is provided with an integral mount and the necessary
attachments to mount the antenna to either a tripod (with a ¼-20
threaded mount) or an ETS-Lindgren antenna mast. Individual
antenna calibration data is included with each antenna.

The Model 93148 is a non-characterized version of the Model

3148. Should calibration/characterization be desired please contact
our calibration department.

© EMC TEST SYSTEMS, L.P. – SEPTEMBER 2002 1
REV C – PN 399239