MERRIMAC CSD-20M-3G

CSD-20M-3G
DIRECTIONAL COUPLER
REV: 003, 05/05/05
TECHNICAL DESCRIPTION
FEATURES
• 2.0 - 4.0 GHz
• LOW LOSS
• HIGH DIRECTIVITY
• EXCELLENT COUPLING ACCURACY
• SURFACE MOUNT
APPLICATIONS
• WCDMA BASE STATION
RF SUBSYSTEMS
• SATCOM
The Multi-Mix® CSD series provides a 20 dB coupling with low insertion loss, low VSWR, and high
directivity. Accurate coupling factors make this series ideal for use in power amplifiers and RF signal distribution and processing.
CSD - 20 directional couplers are fusion bonded multilayer stripline devices. The fusion bonding process
yields a homogeneous monolithic dielectric structure with reliability, ruggedness, and electrical performance that is superior to conventional adhesive bonding techniques.
GENERAL SPECIFICATIONS
FREQUENCY RANGE
MHz
INSERTION LOSS
(dB MAX)
MEAN COUPLING
(dB)
VSWR
(MAX, ALL PORTS)
2000 - 4000
0.35
20 ± 1
1.35:1
FREQUENCY SENSITIVITY
(dB MAX)
DIRECTIVITY
( dB MIN)
POWER
(AVG. CW WATTS)
OPERATING
TEMPERATURE
± 1.0
12
100
-55° TO +85° C
PACKAGE OUTLINE / TAPE AND REEL ORIENTATION
DIRECTION OF FEED
.450
[11.43]
.024
[0.61] TYP.
PORT 2
P
0
P
1
K
0
PORT 1
"A"
.065
[1.65]
.350
[8.89]
PAD 1
"A"
W
B0
CSD-20M-3G
MARKED SIDE UP
PORT 3
A
0
PORT 4
.050
[1.27] TYP.
SECTION "A"-"A"
B
TOP VIEW
K0
A0
P0
P1
W
0
ENGLISH (in) 0.9449 0.4724 0.1575 0.3701 0.4685 0.0795
9.40 11.90 2.02
METRIC (mm) 24.00 12.00 4.00
THE MULTI-MIX MICROTECHNOLOGY® GROUP IS ISO 9001:2000 REGISTERED
U.S. Patent 6,099,677 and other Patents Pending.
Merrimac Industries / 41 Fairfield Place, West Caldwell, NJ 07006
Tel: 1.888.434.MMFM / Fax: 973.882.5990 / Email: [email protected] / www.merrimacind.com
CSD-20M-3G
TYPICAL PERFORMANCE
Insertion Loss
Coupling
-19.00
0.00
-0.10
Coupling (dB)
-20.00
-20.50
-0.20
-0.30
-0.40
-0.50
-21.00
2
2.25
2.5
2.75
3
3.25
3.5
3.75
2
4
2.25
2.5
2.75
VSWR
Port 1
Port 2
Port 3
3
3.25
3.5
3.75
4
Frequency (GHz)
Frequency (GHz)
Directivity
0.00
Port 4
2.00
-5.00
1.90
1.80
-10.00
1.70
1.60
dB
dB
-19.50
1.50
1.40
-15.00
-20.00
1.30
1.20
-25.00
1.10
1.00
-30.00
2
2.25
2.5
2.75
3
3.25
3.5
3.75
4
2
2.25
2.5
Frequency (GHz)
2.75
3
3.25
3.5
3.75
Frequency (GHz)
MOUNTING CONFIGURATION
50 OHM LINE
.032 DIELECTRIC THICKNESS
ER= 3.38
0.337
[8.56]
0.034 TYP. [0.86]
0.350
[8.89]
0.250
[6.35]
GROUND VIAS
PLATED THRU
0.050
[1.27]
0.063
[1.60]
0.068
[1.73]
GROUND PLANE
Ground plane of unit should
be soldered to ground plane
of circuit board for optimum
performance
TRUTH TABLE
1
2
3
4
1
Input
Output
Isolated
Coupled
2
Output
Input
Coupled
Isolated
3
Isolated
Coupled
Input
Output
4
Coupled
Isolated
Output
Input
Merrimac Industries / 41 Fairfield Place, West Caldwell, NJ 07006
Tel: 1.888.434.MMFM / Fax: 973.882.5990 / Email: [email protected] / www.merrimacind.com
4