A loop sniffer probe antenna for HF/UHF is being developed and we'd like to apply a known, constant across frequency AC B-Field source to the region within the substrate where the probe exists (in the simple case, an Air box, sized large enough for the source frequency).
Other source options that we have considered:
- Solenoid with a diameter large enough to contain the sniffer probe
- Simple loop transmitter with the sniffer probe offset specific distance
However, each of these solutions would involve resonant peaks, thereby getting away from the constant across frequency requirement for the design.
Thanks for the time and consideration.
Boyuan Ma , Thank you for the suggestion. I'll look into this.
My work tends to straddle the low to high frequency border (13.56MHz up to 2.4GHz), so rather than replicate efforts, I simulate predominantly in HFSS.
I am not sure what kind of "AC B-Field" source is wanted. The magnetic Hertzian dipole is similar to the loop mentioned in the question.
To generate quasi-frequency-independent AC B-Field bias, one way could be using the TEM mode of a rectangular waveguide with PMC and PEC boundaries. The waveguide has one pair of PMC boundaries and one pair of PEC boundaries. It is excited by a wave port and terminated by PML or another wave port. The fundamental mode supported by this waveguide is of TEM type. The H field is orthogonal to the E field. It points from one PMC boundary to another one. The two PMC boundaries work like a magnetic "capacitor" to generate the magnetic bias.
Another way is to use the plane-wave excitation in HFSS. The H field is orthogonal to the assigned E field.
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