Abstract : This research work proposes a novel approach and topology of a compact two-pixel heterodyne integrated receiver front-end working at room temperature dedicated to planetary and atmospheric sciences. Large arrays of millimeter and submillimeter wave heterodyne Schottky diode-based receivers can offer higher mapping speed and mapping consistency while avoiding the use of cryogenic receivers in planetary and atmospheric sciences. Only highly integrated components make building large array heterodyne receivers possible. One solution consists in integrating in the same mechanical block a frequency multiplier and one or several mixers to create a compact sub-array. We studied a configuration featuring one single solid state LO source pumps two mixers simultaneously by using an in phase waveguide power divider. The mixers and the frequency multiplier are integrated in a same waveguide block to reduce the extra LO losses. This compact topology could be applied for higher frequency and extended linearly for larger array heterodyne receiver.