  We present a relativistic constituent quark model to analyze the mass
spectrum and hadronic properties of radially excited u and d quark sector
mesons. Using a simple Gaussian function as a trial wave function for the
variational principle of a QCD motivated Hamiltonian, we obtain the mass
spectrum consistent with the experimental data. To do the same for several
observables such as decay constants and form factors, it seems necessary to
include both Dirac and Pauli form factors on the level of constituent quarks.
Taking into account the quark form factors, we thus present the generalized
formulas for the rho meson decay constant and form factors as well as the
$\pi\gamma$ transition form factor. We also predict several hadronic properties
for the radially excited states.
