CSD-25BH-0.9G
DIRECTIONAL COUPLER
REV: 006, 05/04/05
TECHNICAL DESCRIPTION
FEATURES
• 410 - 894 MHz
• LOW LOSS
• HIGH DIRECTIVITY
• EXCELLENT COUPLING ACCURACY
• SURFACE MOUNT
APPLICATIONS
• GSM 800 BASE STATION
RF SUBSYSTEMS
• LAND MOBILE RADIO (LMR) SYSTEMS
• RADAR COMMUNICATIONS
• CDMA 450 BASE STATION RF SUBSYSTEMS
• TV TRANSMITTERS
The Multi-Mix
®
CSD series provides 25 dB and 30 dB coupling at 850 MHz and 450 MHz respectively.
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)
410 - 480
450 - 470
869 - 894
FREQUENCY SENSITIVITY
(dB MAX)
± 0.75
± 0.30
± 0.30
INSERTION LOSS
(dB MAX)
MEAN COUPLING
(dB)
30 ± 2.0
30 ± 2.0
25 ± 2.0
AVERAGE POWER
(WATTS, MAX.)
RF
INTERFACE
VSWR
(MAX, ALL PORTS)
0.10
1.12:1
DIRECTIVITY
( dB MIN)
OPERATING
TEMPERATURE
20
450
Leadless Surface Mount
-55° TO +85° C
PACKAGE OUTLINE
CSD-25BH-0.9G
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: MMFM@merrimacind.com / www.merrimacind.com
MERRIMAC [ MERRIMAC INDUSTRIES, INC. ]
