First-time-right Design of Matching Circuts for Complex Antenna and RF Applications

Presentation by Jussi Rahola, CEO of Optenni.

The modern mobile phones and other wireless devices, matching circuits are commonly used to tune the antenna to operate at the desired frequencies and to broaden the operation frequency range of the antenna.

The goal of matching circuit design is actually not to get the best possible impedance match (which can be achieved with adding resistive losses), but to maximize the transfer of energy between the amplifier and the antenna. In multiantenna systems also the coupling between the antennas needs to be considered as it will reduce the efficiency of the antenna systems. For the accurate design of matching circuits realistic component models of inductors and capacitors need to be used. Also, the effect of the circuit layout, i.e. the connecting lines and nearby metallization of the PCB near the matching components needs to be considered carefully.

The layout can be modelled using short segments of microstrip transmission lines or using a multiport electromagnetic simulation model of the layout part of the PCB. Thus, armed with the proper tools, such as the Altair Feko electromagnetic simulator and the Optenni Lab RF Design Automation Platform, antenna designers can obtain first-time-right designs for matching circuits, giving a good agreement between simulated and measured results.
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