In mobile phone applications, for example, an antenna may be coupled to a power amplifier (PA) to drive the antenna circuit. To drive the antenna circuit effectively, the output of the PA should be impedance matched to the antenna circuit. One method involves the use of inductors for impedance matching of the output. However, a PA output match inductor forms a strong magnetic field that couples to adjacent devices, such as surface mount device (SMD) parts and duplexers. This magnetic coupling contaminates receive (RX) and transmit (TX) signals from antennas driven by the PA, which worsens the sensitivity of the PA/antenna combination and noise figure for the amplifier/antenna circuit. If a conformal shield is used to shield the entire device—PA, antenna, SMDs, substrate, etc. (module level conformal shield)—the coupling becomes worse since the magnetic waves will bounce around inside the module and the shield itself will work as an antenna.
Accordingly, there is a need for systems, apparatus, and methods that overcome the deficiencies of conventional approaches including the methods, system and apparatus provided hereby.