Lorch Microwave - Discrete Filters

Specifying Highpass Filters

Highpass Filter Part Number Description

Cavity Filter Part Number Description

1. Number of Sections

2. Series and Package Size

3. Center Frequency, MHZ

4. Bandwidth and Designator (3dB BW Standard)

5. Input Connector

6. Output Connector (if different from Input)

(1) 6" RG 188 Standard
(2) Requires SMA Removable Connectors at High Frequencies

Bandwidth	Designator
3 dB	/(blank)
1 dB	/A
equi-ripple	/R
special	/X
Connectors
Connector Type	Designator
Blind Mate	BP
Cable (1)	C
RF Pin (2)	P
SMA Female	S
SMA Male	SM
SMC Female	SC
SMC Female	SR
Surface Mount	M
Surface Mount-Pins	MP
Special	X

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.

Example:
A HP-Series filter has a cutoff frequency of 300 MHz.

A stopband attenuation of 60 dB is required at 200 MHz. Calculate the number of sections by:

Number of 3 dB bandwidths from cutoff frequency =

The curve indicates that a minimum of 5 sections are 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: 5HP2-98-S
1. Number of sections = 5
2. IL = 5 x 0.2 = 1.0 dB

Note: For Highpass filters, insertion loss is calculated at 1.1 times the cutoff frequency.

Discrete Component Highpass Filters
P/N	Freq. Range Fc (MHz)	Number of Sections	Upper Passband Limit*	VSWR (Nominal)	Avg. Power (Watts)	Operating Temp. (Deg. C)	Relative Humidity
HP2	0.1 - 200	2 - 6	5 x Fc	1.5:1	10	-55 to +85	95%
HP3	3 - 500	2 - 6	5 x Fc	1.5:1	10	-55 to +85	95%
HP4	50 - 1000	2 - 6	5 x Fc	1.5:1	10	-55 to +85	95%
HP5	0.1 - 200	2 - 6	5 x Fc	1.5:1	10	-55 to +85	95%
HPD	550 - 4000	2 - 6	5 x Fc	1.5:1	1	-55 to +85	95%
HP6	300 - 1000	2 - 6	5 x Fc	1.5:1	1	-55 to +85	95%
HP7	500 - 1000	2 - 6	5 x Fc	1.5:1	1	-55 to +85	95%
HP8	10 - 500	2 - 6	5 x Fc	1.5:1	1	-55 to +85	95%
HP9	100 - 1000	2 - 6	5 x Fc	1.5:1	1	-55 to +85	95%