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In this paper, the loading effect and far-field pattern degradation caused by a finger is studied for antennas that can be considered for future user devices operating at 60 GHz. It is found that if a finger is located closer than 2 mm to the antenna, the antenna matching is severely detuned and the antenna radiation efficiency is degraded. For patch and dipole antennas, the far-field radiation behind...
In full-duplex (FDX) multiple-input and multiple-output (MIMO) systems, the self-interference between each transmitting and receiving antenna, caused by finite isolation between antennas, limits the obtainable signal-to-interference ratio of the system and thus the total capacity. In this paper, the design of planar wavetraps for isolation improvement between multiple antennas is introduced, with...
This paper discusses the feasibility of two multi-probe over-the-air antenna test methods at frequencies higher than 6 GHz. The two methods considered in this paper are prefaded signals synthesis (PFS) and plane wave synthesis (PWS) methods. Both methods suffer from huge challenges of the large number of dual-polarized probes required in emulating realistic standing waves in the antenna test zone,...
A compact T-shaped network for decreasing the port-to-port coupling between two strongly coupled antennas is investigated. The proposed circuit comprises of a pair of transmission lines followed by the T-shaped lumped element network connected between the two feeds of the antenna. Finally, a simple L-section matching circuit is added to each port to retune the input impedance matching. The proposed...
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