Meaning
Conductive pattern etched directly onto a printed circuit board substrate to transmit and receive wireless signals. A printed trace antenna eliminates the need for a separate physical antenna component, reducing the bill of materials and the assembly height of the device. This integration requires careful board layout and substrate selection to achieve the desired radiation pattern and impedance matching.
Physical Layout
Geometry of the metal pattern dictates the operating frequency and the bandwidth of the radio interface. The placement of a printed trace antenna must keep a designated keep-out area clear of other components, copper planes, and housing screws. Any change in the thickness of the circuit board material or the dielectric constant will alter the tuning of the antenna.
Cost Efficiency
High-volume manufacturing of smart sensors and wireless modules benefits from the zero-unit-cost nature of this antenna design. Since the printed trace antenna is fabricated during the standard circuit board etching process, it incurs no additional component procurement costs. This cost advantage is balanced against the larger board area required compared to chip antennas.
Production engineers monitor substrate consistency to avoid tuning shifts across different production batches.
Certification Challenge
Variations in the manufacturing tolerances of the board substrate can affect the radiated power and lead to compliance failures during wireless certification. The system designer must verify that the printed trace antenna design meets the spurious emissions and gain limits of regulatory bodies.
