Abstract: Concentric ring array antenna has simple mechanical structure, rotational symmetry beam, low sidelobe levels and many other characteristics, but the array has a large number of elements and the cost of the system implementation is high. In this paper, a method of asymmetrical thinned concentric ring array is proposed. The advantages of array sparse design based on difference sets include analytical characteristic, low computational load and well-behaved sidelobes. First, the cyclic difference sets (CDS) is used to construct the initiating optimal thinned array. Then, make the solution sets produced by difference sets as the initial value of genetic algorithm and combine difference sets and genetic algorithm together, the array structure can be optimized further. The simulation results show that this method can obtain ideal sidelobe levels while maintaining high thinning rate.better match of input waveguide with diodes, which has been successfully applied to this doubler. Commercial GaAs Schottky diodes MA4E2038 are employed. The doubler circuit is fabricated on 0.05mm thick quartz. Simulated results show that the highest conversions efficiency of 10.3% is obtained at 146.8 GHz. Practical highest conversion efficiency of 2.3% is measured at 148GHz when circuit is selfbiased and maximum measured output power of 1.1mW at 154GHz when biased at 0.7V. The output power is high enough for most application, and the novel doubler could provide reference for communication system at 140GHz.