3 Summary

Antenna design for mmWave radar is a balancing act between competing physical limits. At 60GHz and 77GHz, wavelengths are only a few millimeters, so every trace, via, copper surface and dielectric property becomes a significant fraction of a wavelength. These details directly shape how efficiently energy leaves the radar IC and where it goes. Gain, field of view, bandwidth and isolation cannot all be maximized at once. Higher gain narrows coverage, a smaller board limits aperture, and lower-cost materials add loss. The antenna is therefore not an isolated component but part of a system that includes the device, the PCB stack-up, the feed network, the virtual array geometry and the enclosure. Its success is judged by how well it serves the end application, not by any single parameter.

The way to solve this is to start from the application and work toward the hardware in a disciplined, iterative manner. First, define and prioritize what the application truly needs. Then fix the form factor and stack-up, and translate the requirements into measurable antenna targets through a link budget. Design and optimize a single element against these targets, then build it into an array that delivers the required virtual geometry and isolation. Finally, verify everything in the full board layout through EM simulation, with fabrication tolerances included. Each step feeds back to the previous ones when a target is missed, so trade-offs are resolved early, when they cost the least. Validation on fabricated hardware, through chamber measurements and real-world testing, closes the loop and confirms that the design is ready for production.