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 CSD-20N-0.45G
DIRECTIONAL COUPLER
REV: 001, 05/26/05
TECHNICAL DESCRIPTION
FEATURES * 380 - 520 MHz * LOW LOSS * HIGH DIRECTIVITY * EXCELLENT COUPLING ACCURACY * SURFACE MOUNT APPLICATIONS * LAND MOBILE RADIO (LMR) SYSTEMS * RADAR COMMUNICATIONS * CDMA 450 BASE STATION RF SUBSYSTEMS * TV TRANSMITTERS
The Multi-Mix(R) CSD series provides 20 dB coupling at 450 MHz. The CSD series features accurate coupling factors, low VSWR, and high directivity. Very low insertion loss and high power handling capability make this series ideal for use in base station power amplifiers particularly in the main loop of the feedforward amplifiers. The CSD series is also ideal for use in RF sampling networks and control circuitry in high power transmitters. CSD directional couplers are based on fusion bonded multilayer stripline structures. The fusion bonding process yields homogeneous monolithic dielectric structures with reliability, ruggedness, and electrical and thermal performance that are superior to conventional adhesive bonding techniques.
GENERAL SPECIFICATIONS
FREQUENCY RANGE (MHz) 380 - 520 INSERTION LOSS (dB MAX) 0.25 MEAN COUPLING (dB) 20 1.0 VSWR (MAX, ALL PORTS) 1.15:1
FREQUENCY SENSITIVITY (dB MAX)
DIRECTIVITY ( dB MIN)
AVERAGE POWER (WATTS, MAX.)
RF INTERFACE
OPERATING TEMPERATURE
0.30
16
250
Leadless Surface Mount
-55 TO +85 C
PACKAGE OUTLINE
.650 .402
PORT 2
PORT 1 1
.480
CSD-20N-0.45G
.192
2 3 .061
PORT 3 PORT 4 (R) 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: crm@merrimacind.com / www.merrimacind.com
TYPICAL PERFORMANCE CSD-20N-0.45G
Coupling
-18 -18.5 -19 Coupling (dB) -19.5 -20 -20.5 -21 -21.5 -22 380 Insertion Loss(dB) 1 0.75 0.5 0.25 0 -0.25 -0.5 -0.75 -1 380
Insertion Loss
400
420
440
460
480
500
520
400
420
440
460
480
500
520
Frequency (MHz)
Frequency (MHz)
VSWR
Port 1
1.5 -5 1.4 Directivity (dB) -10 -15 -20 -25 -30 380 1.3 1.2 1.1 1 380
Directivity
Port 3 Port 4
0
Port 2
VSWR
400
420
440 460 Frequency (MHz)
480
500
520
400
420
440 460 Frequency (MHz)
480
500
520
MOUNTING CONFIGURATION
GROUND PLANE OF UNIT SHOULD BE SOLDERED TO GROUND PLANE OF CIRCUIT BOARD FOR OPTIMUM PERFORMANCE. 0.537 [13.64]
GROUND PLANE S VIA H UND OUG GROD THR TE PLA 0.063 [1.60]
0.380 [9.65]
0.068 [1.73] 50 OHM LINE .032 DIELECTRIC THICKNESS ER = 3.38
TRUTH TABLE
1 1 2 3 4 Input Output Isolated Coupled
2 Output Input Coupled Isolated
3 Isolated Coupled Input Output
Coupled Isolated Output Input
Merrimac Industries / 41 Fairfield Place, West Caldwell, NJ 07006 Tel: 1.888.434.MMFM / Fax: 973.882.5990 / Email: crm@merrimacind.com / www.merrimacind.com
0.034 TYP. [0.86]
0.050 [1.27]
4


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