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Designing Microwave Band Pass Filters

Mar 19

WRITTEN BY: Peter Martin
Saturday, March 19, 2011

Microwave (and RF) Filter, Diplexer, and Multiplexer Design.

We have written a few papers, and programs etc showing you how to at least make a start, if you would like to have try at doing it all yourself. See links at the bottom of this page. Alternatively you can ask us to do it!

The use of the word 'filter' below also includes diplexers and multiplexers.

Simple Combline Cavity Coupled Band Pass Filter

Filter Specification (fill in as much as you can):

System/Equipment being used in:

Purpose Of Filter?

Filter Type?

Exact Passband(s)?

Insertion Loss?

VSWR (or Return Loss):

Max Power?

Impedance?

Important Stopband(s)or Reject Point(s)?

Stopband (or Reject) Attentuation Level (Min. dB):

Other Comments?

Connectors?

Size Constraints?

Indoor/Outdoor:

Temperature Range:

Quantity?

Q. What is the minimum order quantity?
A. That depends on the type of filter. Generally speaking there is a lot of work, and cost, in developing the first units. This has to be covered by NRE or spread over the cost of a large number of units.
If you can find what you want as an 'off the shelf' or catalogue item elsewhere and you only need one or two units, then almost certainly that will be your best option.
Alternatively we may be able to help with the design so that you can develop your own product.

Q. What frequency range can you offer?
A. Up to 40GHz

Q. Can you include active circuits in your filters?
A. Yes We have experience in all aspects of Microwave design. Power Amplifiers. Frequency converters. VSWR monitors etc.