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® 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) INSERTION LOSS (dB MAX) MEAN COUPLING (dB) VSWR (MAX, ALL PORTS) 380 - 520 0.25 20 ± 1.0 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 PORT 2 .650 .402 PORT 1 2 3 .061 CSD-20N-0.45G .192 .480 1 PORT 3 PORT 4 ® 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 Coupling Insertion Loss -18 1 -18.5 0.75 0.5 Insertion Loss(dB) Coupling (dB) -19 -19.5 -20 -20.5 -21 0.25 0 -0.25 -0.5 -0.75 -21.5 -22 380 400 420 440 460 480 500 -1 380 520 400 420 440 VSWR Port 1 Port 2 460 480 500 520 Frequency (MHz) Frequency (MHz) Directivity Port 3 Port 4 0 1.5 -5 Directivity (dB) 1.4 1.3 1.2 1.1 1 380 -10 -15 -20 -25 400 420 440 460 Frequency (MHz) 480 500 -30 380 520 400 420 440 460 Frequency (MHz) 480 500 MOUNTING CONFIGURATION GROUND PLANE OF UNIT SHOULD BE SOLDERED TO GROUND PLANE OF CIRCUIT BOARD FOR OPTIMUM PERFORMANCE. 0.537 [13.64] 0.050 [1.27] 0.068 [1.73] 50 OHM LINE .032 DIELECTRIC THICKNESS ER = 3.38 0.034 TYP. [0.86] GROUND PLANE S VIA H UND OUG GROD THR TE PLA 0.063 [1.60] 0.380 [9.65] VSWR CSD-20N-0.45G TYPICAL 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 520