Time Averaged SAR Evaluation for Multi Transmitter Arrays
Dynamic time-averaged SAR evaluation balances multi-transmitter power budgets, cutting backoff penalties while securing compliance across global regulatory markets.
Dual-Simultaneous Transmission
Meaning
The concurrent operation of two distinct radio transmitters on different frequency bands defines a core capability of high-performance wireless hardware. When a system utilizes dual-simultaneous transmission, the primary challenge shifts to managing the cohabitation of the active signals within the same device frame. It enables simultaneous data paths for increased throughput.
Intermodulation Interference
Active transmitters can generate unwanted mixing products that fall directly into the receive bands of the adjacent radio. This cross-talk degrades receiver sensitivity and causes packet drops during operation. High-performance bandpass filters must be placed between each transmitter and its antenna to block these spurious emissions.
Thermal Dissipation
Operating two power amplifiers at the same time doubles the localized heat generated within the compact module enclosure. The thermal budget must account for this combined load during high-duty cycle modes. If the heat rises too fast, the system must throttle the throughput on one of the links.
Certification Protocol
Regulatory bodies require extensive specific absorption rate testing for devices that transmit on two bands simultaneously. This testing proves that the combined RF exposure remains below the safety limit for the human body. Lab operators use physical phantoms filled with tissue-simulating liquid to measure the total energy absorbed during concurrent transmission.
The resulting test report is a required component of the handover package for regulatory approval before the device can be sold.