acceptable additional adjacent affect already amplifier another antenna application approx array axial backside bandpass birdcage body bore build built butler capacitive caused challenging channel circumference circumferential coded coil coils color common complex compromise concepts condition conductivity conductor consequence considering constraints coupling coverage cross decouple decoupled decoupling decreases degenerate depth design determined discrete distance dramatically efficiency element elements entire entries especially even experiment feasibility feeding field front fulfilled furthermore geometry guarantee impact impedance improved increasing inductive inhomogeneities inserting inside intrinsically investigates investigations issues known least length limits load loop matrix mentioned middle missing mode mounted necessary necessity neighbor neighbors network next option outer output overcome overlap parallel patent patient performance poor power preamplifier preferably probably protecting pulse reach receive regarding related required requirement resonator ring rings running scalable schematic screen setup shielded shielding simultaneous stacked strength strong sufficient summary talk transmission transmit tray unit units usage view voltages whole wide wiring worst