When specifying a filter, diplexers, or multiplexers please keep the following information in mind, as it will help for us to better realize your requirement, and it may save you money. If you need higher VSWR performance, ALL of our components can be specified to your needs. Increased VSWR will cost additional money, depending on the unit that is being modified, and the new maximum limit. Machining is typically the greatest fixed cost driver with cavity filters and diplexers, so as the size increases, so does the cost. If your requirement frequency range is greater than 2 GHz, you quickly run into the cavity filter launching into waveguide mode if the loss is specified too low.
Waveguide filters are the lowest for loss, but more expensive.
If you give numerous rejection points, testing time is increased. The greater the attenuation specified, the greater number of the sections in the filter. Adding sections increases size, cost, and more importantly insertion loss in your passband. Absolute time delay is a function of the filter's number of sections, return loss, bandwidth, and temperature. Delay variation with frequency is a result of temperature change and can increase rapidly at the band edges, especially with a narrow passband.