The number of sections and the Waveguide size are the
basic parameters that determine the overall length of IrisCoupled
Microwave Filters.
Using some basic formulas and the wave guide width from
the table you can calculate the approximate length for a given Waveguide
and number of sections.
From
EXAMPLE #1. We had a Bandpass filter
centered at 10 GHz with 1.0% BW. From the table above we see WR90 is the
best wave guide size for 10GHz. From the same table we see the width of
WR90 is 0.90 inches. Our calculations done for example #1 Indicated that
we needed 8 sections to meet the required attenuation. With the number
of sections and waveguide width we now we have all the information we
need to calculate the approximate length.
N
= number of sections.
A = width of Waveguide in inches
L = Approximate length in inches
For bandwidths 0.3 to 3.0%
L = For 4-8 sections. L= (0.75 X N + 0.667) a
L = For 9-12 sections. L= (0.8 X N + 1.0) a
So for example #1 we have L= (0.75 x 8 + 0.667) .9 = 6.0
inches
ALLEN AVIONICS INC manufactures many other types of
microwave Filters. Our engineers will help you pick the right filter to
meet all the requirements you have for performance, size and cost. Our
advanced simulation and modeling software will design and do
optimization of Circular Post Coupled filters, Metal-Insert Filters,
Iris Coupled Filters, Combline and Interdigital Filters All of our
Filters can be custom designed for
your application
and we offer fast prototypes. No need to wait five or six weeks to test
your idea or check your system.
Allen Avionics Inc. started in 1960 And has 49 years
experience in design, Production, quality and they use it on every
product they make. Check out the Allen Avionics web site for all their
products. |