Integration of miniaturized patch antennas with high dielectric-constant multilayer packages and soft-and-hard surfaces (SHS)

The soft-and-hard surface (SHS) is employed to suppress the surface wave generated by a patch antenna integrated with high dielectric-constant LTCC multilayer packages. Two antenna structures are investigated to demonstrate the potential capability of the SHS in surface-wave suppression. The fmt is a stacked patch antenna on a large-size substrate. It is shown that using SHS can increase the gain at broadside of the patch antenna by almost 10 dB. The second antenna structure is a circularly polarized (CP) patch antenna designed for GPS applications. It is found that the SHS can reduce the backside radiation of the CP antenna nn a small-size substrate by more than 14 dB. An observation to near-field distributions shows that the SHS can effectively block the surfacewave propagation on the substrate, therefore alleviating the electromagnetic coupling to the RF circuits

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