HandsetantennasHandset antennasa’aa’’aAntenna onlyExternal antennaInternal antennaAntenna not in free space:?Finite ground plane?Effect of handset components (battery…)?User’s presencepInfluenceonantennaperformance!!!Influence on antenna performance!!!33mmv, IEEE AP-S DLP2011 ? IMST GmbH -All rights reservedConceptsforinternalantennasConcepts for internal antennasBasis: Planar Inverted-F-Antenna (PIFA)Result: handset antennaL+H≈λ04ZinResonancefrequencyResonance frequencyInput Impedance?Folded radiator (miniaturisation)?Shape adapted to cover?SlSlots and cuts to induce didmultimode=f(S)BW=f*(H,W)Bandwidth?individual design for each mobile device!!34mmv, IEEE AP-S DLP2011 ? IMST GmbH -All rights reservedEffectofthefinite groundfinitegroundMonopole over infinite ground Handset with integrated PIFAλ/4λ/4Infinitegroundplane~λ/4Handset lengthλ/4λ/4ASSYMETRICALPROBLEM!35mmv, IEEE AP-S DLP2011 ? IMST GmbH -All rights reservedEffectofthePCBEffect of the PCB
?Current distribution on the patch induces
currents on PCB (frequency related!)?PCB contributes to radiation?Equivalent circuit model
GSM
36
DCSPCSUMTS
mmv, IEEE AP-S DLP2011 ? IMST GmbH -All rights reserved
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