Lorch Discrete Filters

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Discrete Component Lowpass Filters

	0.1- 6000MHz
	Microminiature Size
	Computer-Aided Design
	10 Stock Series

Calculating Number of Sections
The curves shown indicate the stopband frequencies normalized to the 3 dB cutoff for filters of 2 to 12 sections. A ratio of stopband frequency to 3 dB bandwidth is used.

The curve shown indicates the frequency response resulting from the circuit used.

Example:
A LP-Series filter has a cutoff frequency of 1000 MHz. A stopband attenuation of 30 dB is required at 1250 MHz.

Calculate the number of sections as follows:

Number of 3 dB bandwidths from cutoff frequency = The curve indicates that a minimum of 5 sections is required.

Insertion Loss Calculation
Knowing the number of sections, and cutoff frequency of the filter, insertion loss may be calculated from the following formula:

Loss = N x 0.2

Example: 7LP7 - 1275 - S
1. Number of sections = 7
2. IL = 7 x 0.2 = 1.4 dB

Note: For Lowpass filters, insertion loss is calculated at 0.9 times the cutoff frequency

Discrete Component Lowpass Filters
P/N	Freq. Range (MHz)	VSWR (Nominal)	Number of Sections	Avg. Power (Watts)	Operating Temp. (Deg. C)	Relative Humidity
LP2	1 - 100	1.5:1	2 - 10	10	-55 to +85	95%
LP3	2.5 - 150	1.5:1	2 - 10	10	-55 to +85	95%
LP4	10 - 200	1.5:1	2 - 10	10	-55 to +85	95%
LP5	0.1 - 10	1.5:1	2 - 10	10	-55 to +85	95%
LP6	10 - 6000	1.5:1	2 - 10	1	-55 to +85	95%
LP7	10 - 6000	1.5:1	2 - 10	1	-55 to +85	95%
LP8	10 - 6000	1.5:1	2 - 10	1	-55 to +85	95%
LP9	10 - 6000	1.5:1	2 - 8	1	-55 to +85	95%
T8L	70 - 1000	1.5:1	2 - 4	1	-55 to +85	95%

Shock 10G
Vibration 20G

See Charts page for outlines and dimensions.
Contact factory for specific requirements not listed above.