LCS "LC" BANDPASS FILTERS

Details

Standard Characteristics

  • Bandpass 10 Mhz to 2000 Mhz
  • Rugged, High Q Construction
  • 3dB Bandwidths - 3% to 80%
  • SMA Connectors Standard (Others Available)
  • 50 Ohm , 70 Ohm,  93 Ohm
  • Lumped Element Spurious Free Design
  • 1.5 VSWR
  • 3 Pole to 10 Pole
  • Both Sides of Stopband are Steep
 LC1.jpg


LCS Filters are constructed using large cross-section inductors and very stable capacitors. This technique minimizes insertion loss and maximizes ruggedness. Internal parts are firmly soldered, but are spot-potted for improved reliability and stability. All joints are microscopically inspected. These filters use a circuit which provides essentially symmetrical stopband slopes, even for broadband models.

LCS Filters are available with center frequencies from 10 Mhz to 2000 Mhz, with bandwidths ranging from 3% to 80% and with up to 10 sections. Both stopband skirts will fall within 10% (in dB) of a .01 dB Chebychev finite Q design. For example, if a lossless design exhibited 70 dB attenuation, a finite loss approximation might display 67 dB and the LCS unit at least 60 dB attenuation. A typical inductor-submitted circuit is shown below:

Chart

Specifications

Series LCS-1 Series LCS-2
Frequency Range (Mhz) 10-1000 10-2000
3 dB BW Percent of Center Frequency 3%-80% 3%-80%
VSWR 1.5:1 or less 1.5:1 or less
Number of Sections 3-10 3-10
Impedance (Ohms) 50*, 70, 93 50*, 70, 93
Power Average (Watts) 10 20
Shock 30 G’s 30 G’s
Vibration 10 G’s 10 G’s
Humidity 95% 95%
Temperature -55 to +85 C -55 to +85 C

*50 Ohms Standard

Insertion Loss Loss vs. Frequency for LCS Filters

To determine the maximum insertion loss in the passband, the following formula is used.

Insertion Loss = (Loss Constant) x (No. of Sections + 1/2) + 0.4 Percent 3dB BW

For Bandpass Filter Series Loss Constant
LCS-1 5.5
LCS-2 6 

      


Last Updated on Wednesday, 08 February 2012 10:40