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) INSERTION LOSS (dB MAX) MEAN COUPLING (dB) VSWR (MAX, ALL PORTS) 410 - 480 450 - 470 869 - 894 0.10 30 ± 2.0 30 ± 2.0 25 ± 2.0 1.12:1 FREQUENCY SENSITIVITY (dB MAX) DIRECTIVITY ( dB MIN) AVERAGE POWER (WATTS, MAX.) RF INTERFACE OPERATING TEMPERATURE ± 0.75 ± 0.30 ± 0.30 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: [email protected] / www.merrimacind.com Insertion Loss -20 0.5 -22 0.4 -24 0.3 Insertion Loss (dB) Coupling (dB) Coupling -26 -28 -30 -32 -34 0.2 0.1 0 -0.1 -0.2 -36 -0.3 -38 -0.4 -0.5 -40 400 500 600 700 Frequency (MHz) 800 400 900 500 600 700 Frequency (MHz) 800 900 800 900 Directivity VSWR 1.3 0 1.25 -10 Directivity (dB) 1.2 VSWR CSD-25BH-0.9G TYPICAL PERFORMANCE 1.15 1.1 1.05 -20 -30 -40 1 400 500 600 700 800 900 -50 400 Frequency (MHz) Port 1 Port 2 Port 3 500 Port 4 600 700 Frequency (MHz) MOUNTING CONFIGURATION 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