A novel scheme of local oscillator feeding based on the near-field coupling

In this paper, a novel feeding scheme of local oscillator feeding based on the near-field coupling is proposed. The coupling effectiveness between two single feeding elements as well as the microstrip arrays is investigated, showing that a good transportation of the power may be realized through appropriate design. In the feeding, both the amplitude and the phase of the feed-in signal are quite insensitive to the positional deviation caused by manufacturing and assembling tolerance. This good performance and its constructional simplicity make this method an attractive candidate for the local oscillator feeding scheme of large arrays.