3smc4ni Renaissance Electronics Corporation, 3smc4ni Datasheet

3smc4ni

Manufacturer Part Number

3smc4ni

Description

High Power Surface-mount Circulators And Isolators

Manufacturer

Renaissance Electronics Corporation

Datasheet

1.3SMC4NI.pdf (3 pages)

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152

reverse signals. Ferrite devices for various ap-

plications are currently available for the entire

microwave frequency band. However, the ex-

panding utilization of RF and microwaves in

wireless cellular and satellite communication

systems revived the efforts to develop new

products that meet current market require-

ments. Recognizing growing demands, a new

series of surface-mount (SM) circulators and

isolators has been developed for high power

applications. This article outlines the general

features and basic performance characteristics

of these devices.

MECHANICAL DESIGN

AND THERMAL CONSIDERATIONS

to the electronic components having coplanar

ports, so that the unit could be directly mount-

ed on the user’s PCB. Another important fea-

ture of a truly surface-mountable device is the

ability to sustain an aqua wash after the unit is

assembled on a board. The product photograph

above shows the basic design of a high power

coplanar surface-mount circulator. Coplanarity

of ± 0.004" in this new series of ferrite devices

was achieved by using a 0.031" thick PCB as a

PRODUCT FEATURE

The term surface-mountable usually refers

on-reciprocal ferrite devices are wide-

ly used in RF engineering as efficient

means for rerouting and suppressing

AND

URFACE

IRCULATORS

IGH

SOLATORS

circulator base and by docking all output ports

along with the ground on the bottom face of

the PCB. The circulator housing is mounted on

top of the PCB. The 50 Ω lines and half-moon

plated-through holes at the PCB’s periphery

provide the required transition of contact ports

from the top to the bottom face of the PCB.

The configuration of all three ports is consis-

tent with standard footprint patterns estab-

lished in the microwave industry for this class

of ferrite devices. The 18 plated-through holes

located in the central area carry electrical

ground to the housing of the circulator. These

via holes become filled with solder when the

housing is assembled on a PCB. The completed

vias, having a total thermal impedance of 1° to

2°C/W,

the ground. With a typical room temperature

insertion loss maintained below 0.25 dB, and

less than 0.35 dB over the specified tempera-

ture range, the units are rated to 100 W CW

forward power. Under forced cooling condi-

tions, the SM devices are capable of handling

up to 175 W of CW power. A rigid cap protects

Harvard, MA

OWER

ENAISSANCE

(REC)

MOUNT

MICROWAVE JOURNAL

provide an additional thermal path to

LECTRONICS

[Continued on page 154]

■

FEBRUARY

ORP

2003

Related parts for 3smc4ni

3smc4ni Summary of contents

Page 1

PRODUCT FEATURE N on-reciprocal ferrite devices are wide- ly used in RF engineering as efficient means for rerouting and suppressing reverse signals. Ferrite devices for various ap- plications are currently available for the entire microwave frequency band. However, the ex- ...

Page 2

... Click LEADnet at mwjournal.com or Circle XXX on Reader Service Card the circulator/isolator housing ...

Page 3

This model does not have a cap implying that the unit should not undergo an aqua wash treatment. The new line of SM isolators in- cludes high power devices that ...

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