A back-to-back dual-beam active microstrip leaky-wave antenna array with mode-switching capability

An X-band two-element back-to-back coupled-oscillator-driven spatial power- combining microstrip leaky-wave antenna array is developed, which has a dua l-beam radiation pattern and mode-switching capability. Two Gunn diode CPW oscillators are placed on the back side of the substrate, each driving two back-to-back microstrip leaky-wave antenna pairs in opposite directions for dual-beam operation. This active antenna array is able to produce sum and difference patterns between the in-phase and 180 degrees out-of-phase mode by controlling the bias voltages of the Gunn diodes. (C) 2000 John Wiley & Sons, Inc.