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:
| SPECIFICATIONS | Series LCS-1 | Series LCS-1 |
| 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
To determine the maximum insertion loss in the passband, the following formula is used.
Insertion Loss = (Loss Constant) (No. of Sections + 1/2) +0.4
Percent 3dB BW
For Bandpass Filter Series Loss Constant
