Search Words: Base Station System, Consultancy, Filter, Electronic design, Electromechanics, Envelope Tracking, isolation, Layout, Power amplifier, Power supply, Research services, Telecommunication, Circuit board, Development in China, Simulation, Power Amplifier, EM, EMC, EMI, ET, LTE, FDD, TDD, PA, RF, PCB, PSU, PWB, VCO, Wireless, TD-SCDMA, WCDMA China / Shanghai: We are located in Shanghai, China. Line of business is electronics product development (schematic, circuit board and mechanical design) including testing. We are specialized in wireless technologies. . Room 832, 4/F Mayfair Tower, 83 Fumin Road, Jing'an District, Shanghai 200040 China . tel. +86 158 0078 1757 Company Information: Esju Oy is a private high-tech enterprise, founded in 1991. Main business area is telecom product development & research services. We are specialized for RF, EMC. Addition we serve for digital HW, embedded SW, DSP and Electromechanics areas.