Design and characterization of a 120-GHz millimeter-wave antenna for integrated photonic transmitters

We developed a planar slot antenna on an Si substrate for a photonic > 100- GHz millimeter-wave (MMW) transmitter. We designed the antenna by using thr ee-dimensional electromagnetic-field simulators and characterized its perfo rmance by using an optoelectronic network analyzer. The transmitter uses a very fast photodiode with high output power. Using these photonic technique s, we succeeded in building this compact photonic transmitter that emits MM Ws with a power of >0.2 mW at a frequency of 120 GHz.