CST – Computer Simulation Technology

Optenni Lab

Estimation of obtainable bandwidth

In the analysis of isolation between two antennas, it is well known that the matching of both antennas affects the isolation. To remove the effect of antenna matching, Optenni Lab can calculate the so-called “electromagnetic isolation”. This means that at each frequency, two antenna ports are simultaneously conjugate matched while the others are terminated with given impedances.

Optenni Lab offers tools for estimating the obtainable bandwidth of an antenna from its impedance curves. There are two approaches available in Optenni Lab: the optimized bandwidth potential approach and the Q-factor approach.

Optimized bandwidth potential

In the optimized bandwidth potential calculation, Optenni Lab constructs an optimized two-component matching circuit for each frequency, and calculates the obtained maximal impedance bandwidth. It repeats the analysis for all frequencies and produces a curve that shows what bandwidth can be obtained at different frequencies.

Optimized bandwidth potential calculation allows...

Optimized bandwidth potential calculation allows...

  • ...differently matched antennas to be compared, in order to show which one offers best obtainable bandwidth
  • ...verification of whether the bandwidth is large enough for the desired application, even if the antenna was not originally resonant
  • ...analysis of which frequencies the antenna gives maximal bandwidth

The optimized bandwidth potential calculation speeds up the antenna design process. The obtainable antenna bandwidth can be estimated quickly from a measured or simulated prototype without explicitly tuning the antenna to resonance at the desired frequency range. If the bandwidth is not sufficient, the design can be modified until the specifications have been met. Then the antenna can then be tuned to resonance by changing the antenna geometry or by generating a matching circuit with Optenni Lab.

Q-factor estimation

In addition, Optenni Lab can estimate the antenna Q-factor based directly on the impedance data. This method is less accurate than the bandwidth potential calculation especially if the impedance data is noisy or if multiple resonances are present.

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