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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
Overview
Bandpass
Lowpass
Highpass
Charts


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 Highpass Attenuation Chart

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%

Shock 10G
Vibration 20G
See Charts page for outlines and dimensions.
Contact factory for specific requirements not listed above.

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