Filter Request for Information Form
This form was developed as a template to make it easy for our customers to enter
the information DLI needs for an initial assessment of filter performance, size and cost.
After submitting this form DLI Applications Engineering will contact you. From these discussions
DLI will provide you with further information about possible topologies and predicted filter performance.
Then you can decide if a filter on a high-k dielectric is the right option for you.
Please note: This is not an order form. There is no obligation until you are confident
in our capabilities and actually decide to place an order.
DLI Filter Typical Specification*
- Up to 20 Watts RF power
- 2-67 GHz
- Up to 40% fractional bandwidth and 16 pole performance
- Free of any out-gassing/Radiation Hardened Technology/No aging effects
- High-k technology provides improved field confinement, high Q and better isolation
- Industry’s best temperature stability and low CTE mismatch
* Typical Performance Specifications are for reference only. Please consult DLI Applications Engineering with your unique requirements.
To facilitate further discussion or information please provide your contact information below.
Due to U.S. Bureau of Industry and Security Standards, if your company is located
outside of the United States or if request is for military application please
complete the following fields.
Filter Response Type
Selecting the surface mount option might seem attractive
at first but keep in mind that surface mount filters will typically have less rejection than filters that are wire-bonded into the circuit. If you opt for a SMT filter,
60 dB or more rejection might be difficult to achieve in volume production.
Mechanical Size Limitations and Cover or Shield Height
If possible, please limit filter length to a multiple of 100 mil (=2.54 mm).
This will speed up manufacturing and minimize test. If you don’t know exact dimensions
or would like DLI to provide a size estimate leave these fields blank for now.
DLI Filters Require Covers
Please enter the desired filter Center Frequency (geometric or arithmetic mean of the
upper and lower cutoff frequencies). If you have special requirements such as a 1dB cutoff
instead of 3dB points or you have a maximum pass band ripple spec you can paste that information
into the attenuation section. DLI filters usually offer very attractive benefits in the 2 GHz to
67 *1 GHz range. Below that range we tend to be less competitive unless your application needs
extreme temperature stability.
*1 Please note that 67 GHz is an artificially imposed end point and is in place because of DLI test equipment limitation.
*2 A good way to lower the insertion loss of a filter is to make the bandwidth as high as possible.
In general it is very hard to make something that has less than a 1% fractional bandwidth so try to
keep the band-width in your system in the range 2-40% or you will risk a higher loss figure. To get
the fractional bandwidth from the 3dB bandwidth, divide the 3dB bandwidth by the filter center
frequency and convert this ratio to percent.
DLI strives to design the filter to the lowest possible insertion loss for a given specification.
For our initial assessment it is important to know if your application has a hard limit for insertion loss
DLI will design a filter to have a low and even return loss in the pass band but we need to know if your
system requirements dictate a minimum value of the S11. Common values are -10 dB, -12 dB or -15 dB etc.
If you prefer VSWR figures (example 2:1) you can enter them as well.
Copy and paste your attenuation specification here (system requirements, mirror frequencies to suppress,
out of band signals of interest etc.) We want to know all about it so we can select the most appropriate
filter topology. If your circuit is sensitive to second or third order responses, please indicate the amount
of suppression needed.
Do you need a test fixture with the filter and if so what connectors do you plan to use?
Are there any special test requirements or application specific requirements such as; temperature range,
test documentation or mounting information, space qualification etc?
NRE Fee Information
If this requirement results in the need to create a new design DLI may charge for photo masks,
tool setup and engineering time, commonly referred to as NRE. If this is a problem DLI can amortized
the NRE Fee over the initial prototype quantities or we may be able to make other arrangements based
upon special considerations such as the life of the program. To prepare a budgetary quote it is
important to know if you want to have the NRE paid as a lump sum or divided up.
If you have an idea about how many filters your project is going to need over the next year
or two (or more) we would like to know about it to give you the best possible price estimation.
DLI has no issue with low volume projects with high performance requirements. If you will go to
high volumes it is also not an issue but we need to know for a proper quotation.
Your best estimate is fine.
DLI understands that price is an important factor to take into account at the beginning of the design cycle.
DLI may not always yield the lowest cost solution but often achieves the best performance,
smallest size and best temperature stability compared to competing technologies in the marketplace.
This is especially true at higher frequencies. DLI will use the target price and volume projections
when reviewing potential solutions. We will advise if we are unable to meet your price target.
What type of response would best describe what you are looking for?
Please select the alternative that most appropriately describes what you expect us to provide to you.
DLI appreciates your time and effort; a DLI Application Engineer will contact you to discuss your filter requirement.
You can also print and fax this form to our fax at +1 315 655 0445