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| 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(R) 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(R) 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 TYPICAL PERFORMANCE CSD-25BH-0.9G Coupling -20 -22 Insertion Loss (dB) -24 Coupling (dB) -26 -28 -30 -32 -34 -36 -38 -40 400 500 600 700 Frequency (MHz) 800 900 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 400 500 600 700 Frequency (MHz) 800 900 Insertion Loss VSWR 1.3 0 1.25 Directivity (dB) 1.2 VSWR 1.15 1.1 1.05 1 400 Port 1 Directivity -10 -20 -30 -40 500 600 Port 2 700 Port 3 800 Port 4 900 -50 400 500 600 700 Frequency (MHz) 800 900 Frequency (MHz) MOUNTING CONFIGURATION Ground plane of unit should be soldered to ground plane of circuit board for optimum performance TRUTH TABLE 1 1 2 3 4 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: MMFM@merrimacind.com / www.merrimacind.com |
Price & Availability of CSD-25BH-09G
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