MICROLAB/FXR Low Pass Filters LA series Reliable Rod and Bead Design Medium Power, Very Low Loss 400 -18,000 MHz Cut-Off 50 Watt Average Power Rating Minimal RF Insertion Loss Exceptionally High Reliability Low Cost Design N, BNC, TNC and SMA Connectors Microlab/FXR Model LA series low pass filters are designed to suppress harmonics and out of band noise and interference, to improve signal quality in medium power system applications and bench testing. The rod and bead filter is constructed of alternate lengths of high and low impedance transmission lines tuned to provide the proper frequency response. Careful design of the matching end sections ensures a low loss pass band response down to at least 40% of the cut-off frequency. In the stop band rejection of at least 55 dB occurs at 150% of cut-off and extends typically for several octaves. When compared to lumped element construction, the single piece rod and bead filter has far fewer solder joints, is better supported, and operates cooler with a better VSWR. Options for special cut-off frequencies, special low pass responses, different polarity or alternate connectors are available on request. Note that not all connectors can be used to 18 GHz. (1/01) Specifications Model LA series Pass Band: 0.4f c - 1.0f c Stop Band Rejection: At 1.2 fc: 25 dB min. At 1.5 fc 55 dB min. Power Rating: < 7 GHz 50W avg, 4kW pk > 7 GHz 25W avg, 1 kW pk Temperature: -55 to+150C Connectors: N (m-f) type Connector Finish: Silverplate per QQ-S-365 Housing Finish: Iridite per MIL-C-5541 Typical Performance Model Selection (N connectors) Part No. LA-04N LA-07N LA-10N LA-15N LA-20N LA-30N LA-40N LA-50N LA-60N LA-70N LA-80N LA-90N LA-100N LA-110N LA-120N LA-150F LA-180F Cut-Off MHz* 400 700 1000 1500 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 15000 18000 VSWR max. 1.30 1.30 1.30 1.30 1.30 1.30 1.40 1.40 1.40 1.40 1.50 1.50 1.50 1.50 1.50 1.50 1.50 Loss max dB 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.3 0.3 0.4 0.4 0.4 0.4 0.4 Length in.(mm) 14.6 (409) 9.9 (277) 7.4 (207) 5.8 (162) 4.7 (132) 4.8 (134) 4.0 (112) 3.6 (101) 3.2 (90) 3.0 (84) 3.2 (90) 3.0 (84) 2.8 (78) 2.8 (78) 2.7 (76) 1.6 (45) 1.9 (53) Weight Oz (g) 7 (178) 6 (152) 5 (127) 4 (102 4 (102) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) 3 (76) 0.5 (12.7) 0.5 (12.7) *below 700 MHz +4,-0%, 700 MHz and above +2,-0% Weights and lengths all nominal. Alternate Connector Specifications Connector Suffix N BNC TNC SMA N B T F Typical Part No. LA-04N LA-04B LA-04T LA-04F Max. Frequency 12 GHz 4 GHz 7 GHz 18 GHz Weight Difference None -2 (-54) -2 (-54) None Microlab/FXR, Ten Microlab Road, Livingston, New Jersey 07039-1682 USA * Tel: (973) 992-7700 E-mail: sales@microlab.fxr.com * Website: www.microlab.fxr.com * Fax: (973) 992-0513