Under the harsh Martian environment, maintaining reliable communication during Martian exploration missions is challenging. Limited power availability and mass constraints necessitate innovative solutions for communication systems. This study presents the design and simulation of a medium-gain Ka-band microstrip patch antenna optimized for rover-to-orbiter communication links. Two configurations, a single patch and 1 × 2 series array, were developed, analyzed, and optimized using the CST Studio Suite antenna software. The single-element antenna achieved a bandwidth of 1.8 GHz (25.38–27.18 GHz) with a return loss of –16.95 dB at 26.5 GHz. The 1 × 2 array achieved a wider bandwidth of 3.8 GHz (24.7–28.5 GHz) with a return loss of – 23.24 dB, centered at 26.5 GHz, implemented on the Rogers RT/Duroid 5880 lossy material, whose dielectric constant εr is 2.2. The proposed antenna design was optimized for lightweight implementation while achieving reliable medium-gain performance for rover-to-orbiter links, satisfying the Ka-band requirement and providing a wide field of view. The proposed design leverages microstrip patch antenna technology to improve the signal directionality and adaptability for planetary research while maintaining lightweight structures. A preliminary simulation analysis indicated promising performance characteristics, demonstrating the feasibility of this antenna for deep-space communication. Future extensions include expanding the array size to meet the Earth-return communication requirements.