A 430 GHz tripler circuit in the terahertz range, which consists of all parts of a tripler, has been designed and fabricated on a 12 μm thick GaAs film substrate. A pair of two matched anti-parallel Schottky diodes without application of direct current bias is used to realize series balanced tripler structure. One distinct advantage of the balanced configuration is that it generates only odd harmonics, which simplifies the tripler analysis and optimization. Harmonic nonlinear simulations and three-dimensional electromagnetic simulations are combined to simulate radio-frequency performance of the entire tripler circuit accurately. The monolithically integrated 430 GHz tripler circuit is mounted in a split waveguide block for test. It has produced a peak output power of 215.7 μW with 4.3% efficiency at 430 GHz.