3smc4ni Renaissance Electronics Corporation, 3smc4ni Datasheet

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3smc4ni

Manufacturer Part Number
3smc4ni
Description
High Power Surface-mount Circulators And Isolators
Manufacturer
Renaissance Electronics Corporation
Datasheet
152
N
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
H
S
C
AND
URFACE
IRCULATORS
IGH
I
SOLATORS
P
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
R
Harvard, MA
OWER
ENAISSANCE
(REC)
-
MOUNT
1
MICROWAVE JOURNAL
provide an additional thermal path to
E
LECTRONICS
[Continued on page 154]
FEBRUARY
C
ORP
.
2003

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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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