Often etched into the metal bezel of modern smartphones to save internal space.
Contemporary mobile units utilize several standardized internal antenna architectures: Antennas for portable devices
Designing antennas for modern handsets involves navigating strict physical and regulatory constraints: Inbuilt Multiband Microstrip Antenna for Portable Devices Often etched into the metal bezel of modern
Used for multi-band performance in compact metal-frame devices. Antennas for portable devices
Common for compact devices due to their low profile and ease of matching.