DATA SHEET

Document No. ET0361EJ1V1DS00

Date Published September 1998 M

Printed in Japan

30 GHz, 20 W CW, LIGHT WEIGHT, COMPACT, EFFICIENT

MICROWAVE POWER MODULE

FOR COMMUNICATIONS

LD79A02K

The information in this document is subject to change without notice.

©

1998

GENERAL DESCRIPTION

MPM stands for Microwave Power Module and is the solution introduced by NEC for a microwave power

source with high efficiency and the most compact size.

The MPM consists of a miniaturized traveling wave tube (TWT) and an electronic power conditioner (EPC). All

the potential interface problems are taken care of by NEC and the user simply connects the MPM to his RF

output and plugs in the DC supply.

LD79A02K is a complete integrated unit and can deliver an output power of 20 W over the range of 27.5 to

30.0 GHz with a gain of 40 dB.

The TWT of RF section in the LD79A02K has been designed and developed upon the NEC's advanced technology

and enormous experience on a number of TWTs used in satellite ground terminals and terrestrial microwave

links.

The very small and light weight EPC designed with sophisticated and experienced circuit technology ensures

higher reliability, reduced maintenance costs and improved technical performance.

The LD79A02K is most suitable for a power amplifier in LMDS and Multimedia Satellite communication

systems.

FEATURES

™ Light weight, Compact, and Efficient

The TWT built in the MPM has a dual-depressed collector and is designed to operate at high efficiency across

the power output range. The EPC features state-of-the-art techniques to optimize size and efficiency and the

combination results in a unit significantly smaller and with less power consumption than a comparable solid

state amplifier.

™ Low Distortion

NEC has developed techniques for the correction of non-linear distortion of gain and phase generated in a

TWT. As a result, the MPM has optimum performance across a broad power range and is ideally suited for

multi-carrier transmission systems.

™ Long Life

The TWT is designed to have a lifetime of 80,000 hours or more, which is comparable to that of a solid state

amplifier in actual usage.

™ Ideal for Digital Systems

A mini-arcing in the electron gun have been eliminated in the TWT.