  In this work some aspects of models with universal extra dimensions are
studied. In particular, in the case of models with one universal extra
dimension their phenomenology is investigated and used to extract bounds on the
size of the extra dimension. In addition, the phenomenology of their latticized
counterparts is also investigated. The running of the gauge coupling constants
in models with an arbitrary number of universal extra dimensions is revisited.
The possible reliable determination of the power corrections that appear is
studied. Finally, a model with one non-universal extra dimension is presented
to compare the results in these kind of scenarios with the universal ones.
