Specifications Model LA series
Pass Band: 0.4fc – 1.0fc
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+150°C
Connectors: N (m-f) type
Connector Finish: Silverplate
per QQ-S-365
Housing Finish: Iridite per
MIL-C-5541
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
Typical Performance
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 ha
s 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)
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
Model Selection (N connectors)
Part No. Cut-Off
MHz* VSWR
max. Loss
max dB Length
in.(mm) Weight
Oz (g)
LA-04N 400 1.30 0.2 14.6 (409) 7 (178)
LA-07N 700 1.30 0.2 9.9 (277) 6 (152)
LA-10N 1000 1.30 0.2 7.4 (207) 5 (127)
LA-15N 1500 1.30 0.2 5.8 (162) 4 (102
LA-20N 2000 1.30 0.2 4.7 (132) 4 (102)
LA-30N 3000 1.30 0.2 4.8 (134) 3 (76)
LA-40N 4000 1.40 0.2 4.0 (112) 3 (76)
LA-50N 5000 1.40 0.2 3.6 (101) 3 (76)
LA-60N 6000 1.40 0.2 3.2 (90) 3 (76)
LA-70N 7000 1.40 0.2 3.0 (84) 3 (76)
LA-80N 8000 1.50 0.3 3.2 (90) 3 (76)
LA-90N 9000 1.50 0.3 3.0 (84) 3 (76)
LA-100N 10000 1.50 0.4 2.8 (78) 3 (76)
LA-110N 11000 1.50 0.4 2.8 (78) 3 (76)
LA-120N 12000 1.50 0.4 2.7 (76) 3 (76)
LA-150F 15000 1.50 0.4 1.6 (45) 0.5 (12.7)
LA-180F 18000 1.50 0.4 1.9 (53) 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 Typical Part
No. Max. Frequency Weight
Difference
N N LA-04N 12 GHz None
BNC B LA-04B 4 GHz -2 (-54)
TNC T LA-04T 7 GHz -2 (-54)
SMA F LA-04F 18 GHz None
