Antennas come in many shapes and sizes, although printed-circuit-board (PCB) antennas provide the capability of packing a great deal of performance into miniature footprints. Of course, many antennas—including those based on PCBs—must be designed and fabricated for minimum passive intermodulation (PIM) levels for maximum effectiveness in today’s crowded signal environments. For PCB antennas, low PIM is a function of the antenna design but also of the choice of RF/microwave
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