  Heavy resonances decaying into a pair of fundamental particles such as $jj$,
$\ell^+\ell^-$, $\gamma\gamma$, and $\ell\nu$, are among the most common
features to search for phenomena beyond the standard model (SM). Electroweak
boson pair production, such as $WW$ or $ZZ$ with subsequent decays to
$\ell\nu\ell'\nu'$ and $\ell\ell jj$ respectively, is a powerful test of the
spontaneously broken gauge symmetry of the SM and can be also used to search
for phenomena beyond the SM. There is a wide spectrum of theoretical models
predicting these kinds of resonant signatures. This note covers several
searches for these new phenomena conducted within ATLAS in 2011 and 2012 for
the LHC 7 and 8 TeV center of mass energies respectively. No significant
deviations from the SM have been observed and therefore, limits are set on the
characteristic parameters of several new physics models. These benchmark models
include new heavy $Z'/W'$ gauge bosons, chiral excitation of the SM weak gauge
bosons, $Z^*/W^*$ Randal-Sundrum and ADD gravitons, Composite models for
quarks, e.g. $q^*$ with substructure scale $\Lambda$, Quantum black holes,
TeV$^{-1}$ Kaluza-Klein excitation of $\gamma/Z$ and more.
