Submit your Custom Specifications by component type: Band Pass Diplexer Diplexer-LNA Filter Amps Low Noise Amplifiers Highpass Lowpass Multiplexers Other

Delta's engineers have helped numerous customers with issues ranging from packaging to power handling to inter-modulation products. Over the years we have evolved innovative proprietary solutions to today's toughest RF problem areas including:

• VSWR mismatch between discreet devices.
• Increased noise figure between Filters and LNA's.
• Inter-modulation Products within passive devices.
• Matching of Antenna and Filter/LNA networks.
• Temperature stability of narrow passband devices over a wide range of temperatures.
• Using multiple "zeroes" to create maximum flat time delay response.

When specifying a filter, diplexer, or multiplexer, please keep the following information in mind, as it will help for us to better realize your requirements and save you money:

1. VSWR or Return Loss. Be aware of VSWR buildup within your system. 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.

2. Insertion Loss. Lower insertion loss can generally be traded for size and cost. A good rule of thumb is if you double the size of a component, you reduce the loss by 1/2 and vice versa. 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.

3. Rejection. Please only specify critical points. 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.

4. Time Delay. 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. Tight time delay parameters may significantly increase filter cost.

5. Operating Environment. Most filters are required to have some sealing. If your filter requirement is for a sealed environment, include that with your specification. Our standard units are sealed and can be in an environment of 95% humidity (but not directly in the elements) We can seal the unit to pass gross leak testing for outdoor use, or even fine leak seal units with an internal volume of air less than 4 cubic cm.