PCB antennas (Printed Circuit Board Antennas) are an increasingly popular solution for sub-GHz communication systems due to their compact size, low cost, and ease of integration into electronic devices. These antennas are designed directly on a PCB using conductive traces and are especially common in smart meters, smartphones, IoT devices, wireless routers, and mobile hotspots. The compact nature and integration with the circuit board reduce the need for external components, making them ideal for modern, miniaturized devices.