Balanced Combiners can be connected together to realize Chain-Combiners, also mixing different Cavity Sizes and Number of Poles, in order to optimize the Combiner chain.
A chain of n Balanced Combiners has n Narrowband inputs and one Wideband input port, which can be used to further extend the combiner combination capability, adding new or exiting combiners, also with other techniques (Starpoint, Manifold):
|Wideband Port Use
|Not used, Terminated with Load
||0 channels added (can be added at a later stage).
|Filter, Starpoint or Manifold Combiner, existing Combiner
||1, 2 or more extra channels added. Cheapest Solution.
Balanced Combiners also allow to be extended at a later stage. The new channels can be added inserting a new combiner in two possible different positions into the Combiner chain:
||Requirements, Advantages and Disadvantages
|On the Output (antenna) side
||The new Combiner must be Balanced. The integration requires major mechanical work, and the new Combiner is generally bigger. The new Balanced combiner can be optimized to accept the existing channels.
|In the Wideband Input
||Requires the existing combiner to have its Wideband port unused (terminated with a load), able to accept the new frequencies and withstand the increased power. The new Combiner can be Starpoint, Manifold, Balanced (or a single Filter). The integration requires minor mechanical work, and the new Combiner is generally smaller.