Custom Diplexers
High Performance Custom Diplexers ...
- Consists of a lowpass and highpass joined to a common port, and built to specified requirements
- Standard LH7 (see Table: LH7) can be customized - guard band (10% frequency separation) required
- More complex Diplexer networks can be built to your requirements, e.g, "Brickwall" Lowpass and Highpass with common port (1.5 MHz guard band)
- Custom Diplexers are available on quotation basis
- To specify filter, basic info to include are shown in fig.1 and listed below ...
Basic Specifications list:
| Lowpass Specs: | Highpass Specs: | ||
| Fc1 : | 3 dB cutoff frequency (in MHz) | Fc2: | 3 dB cutoff frequency (in MHz) |
| Passband: | Fb to Fc1 (in MHz) | Passband: | Fc2 to Fs (in MHz) |
| Loss: | <1dB (or 4.5 dB with combiner *) | Loss: | <1.5dB (or < 5dB with combiner *) |
| Ripple:: | .as low as .25 dB | Ripple: | as low as .5 dB |
| Return loss: | from 14 to 20 dB | Return loss: | 12 to 18 dB |
| Isolation: | from 20 to 70 dB | Isolation: | from 20 dB to 70 dB |
| Transition (Guard band): |
1.5 MHz | Minimum transition |
1.5 MHz |
| Power pass | AC/DC (DC block available) | Power pass | Non (AC/DC pass -inquire) |
General Specs:
| Model number: | As per Quote |
| Operating bandwidth: | from Fb to Fs (in MHz |
| Guard band: | specify Fc1 & Fc2 (frequency
separation 1.5 MHz min*) |
| Impedance: | 75 ohms standard (50 ohms - option |
| Operation: | Indoor standard (outdoor - option) |
| Physical dimensions: | depends on RF characteristics of diplexer |
| Connectors: | Type F (BNC, SMA or N types - option) |
* Broadband signal combiner is required to combine low and high bands when Fc1 and Fc2 are frequency separated by less < 5 % (additional 3.5 dB insertion loss).