  This paper is concerned with breather solutions of a radially symmetric
curl-curl wave equation with double power nonlinearity. By considering the
solutions with a special form, we obtain a family of ordinary differential
equations (ODEs) parameterized by the radial variable. Then we characterize
periodic behaviors and analyze the joint effects of the double power nonlinear
terms on the minimal period and the maximal amplitude. Under certain
conditions, we construct a breather solution for the original curl-curl wave
equation and find such a solution which can generate a continuum of
phase-shifted breathers.
