Load shift keying (LSK) is used to backscatter receiver side information back to the transmitter side. A detection (tertiary) coil lying on the transmitter side receives and decodes that information with better sensitivity. The effects of different tertiary coil parameters such as compensation capacitance, quality factor, and the number of turns are studied for maximizing voltage gain and end-to-end efficiency through analytical modeling, SPICE simulation, and measurement results. The area increment due to tertiary coil structure is prevented by a novel ‘inside-tertiary coil structure.’ The performance of the two different variations of tertiary coils is discussed in detail in this paper. Voltage gain and efficiency are improved by ~197% and ~15%, respectively, at 15 mm for novel analytical guideline-based design techniques. Design strategy improves the operating distance of implant from 12 to 18 mm.