Hybrid Coupler Combiners
Hybrid coupler combining for the most part is considered as an alternative to cavity combining when the close frequency relationship between the coupled transmitters prohibit cavity combining. The size benefit compared to cavities is also considered a major advantage in using this type of combining technique. Where frequency agility is required, hybrid coupler combining is ideal where the additional combining losses can be tolerated. RFI are able to build hybrid coupler combiners in any number of port combinations into 19" rack trays or boxes using a single or, where necessary, dual isolator at the input port.
If you require multicoupling not shown here, please contact your local RFI sales office.
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VHF Mid Band (66-88MHz)
Apart from the limitation that cavity combining has on close frequency spacing between channels, hybrid coupler combining in the lower VHF frequency bands is always a major consideration as an alternative when space is limited for cavity combining. RFI provides a number of hybrid coupler combining port combinations with either single or dual isolators. It is recommended that in addition to the hybrid coupler combiner, a band pass filter (either as a post Tx combining filter or duplexer) is inserted after the hybrid coupler combiner prior to connection to any antenna or radiating cable.
VHF High Band (132-300MHz)
Where limitations apply on cavity combining due to close frequency spacing between channels, hybrid coupler combining is a viable alternative if higher insertion losses can be tolerated. Where space is a limiting factor for the installation of VHF cavities, hybrid couplers are a practical alternative. RFI provides a number of hybrid coupler combiner port combinations and RF power capabilities using either single or dual isolators. It is recommended that in addition to the hybrid coupler combiner, a band pass filter (either as a post Tx combining filter or duplexer) is inserted after the hybrid coupler combiner prior to connection to any antenna or radiating cable.
UHF Band (300-550MHz)
Where limitation apply on cavity combining due to close frequency spacing between channels, hybrid coupler combining is a viable alternative if higher insertion losses can be tolerated. Where space is a limiting factor for the installation of UHF cavities, hybrid couplers are a practical alternative. RFI provides a number of hybrid coupler combiner port combinations and RF power capabilities using either single or dual isolators. It is recommended that in addition to the hybrid coupler combiner, a band pass filter (either as a post Tx combining filter or duplexer) is inserted after the hybrid coupler combiner prior to connection to any antenna or radiating cable.
700/800/900MHz Bands (746-960MHz)
Popular in high frequency applications where frequency agility is a pre-requisite, hybrid coupler combining has the additional advantage of being relatively compact and easy to install. RFI provides a number of hybrid coupler combiner port combinations and RF power capabilities using either single or dual isolators. It is recommended that in addition to the hybrid coupler combiner, a band pass filter (either as a post Tx combining filter or duplexer) is inserted after the hybrid coupler combiner prior to connection to any antenna or radiating cable.
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