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- Title
Fundamental‐mode EMSIW for miniaturized differential antenna with high CM rejection.
- Authors
Fu, Xuedong; Sun, Mingyu; Chen, Aixin
- Abstract
This letter proposes a novel miniaturization approach for differential antennas using fractional‐mode substrate integrated waveguide (SIW) fundamental‐mode. Symmetrically arranging dual miniaturized cavities, in‐phase DM magnetic currents are constructed to superimpose differential‐mode (DM) E‐fields for enhanced radiation while simultaneously constructing reverse common‐mode (CM) magnetic currents to cancel the CM E‐fields and suppress the CM signal. Three kinds of eighth‐mode SIW differential antennas with boundary symmetry are designed to verify the approach. Analysis of the equivalent circuit models reveals that the DM resonant frequency is lower than the CM resonant frequency, effectively suppressing CM signal within the DM passband through impedance mismatch reflection and radiation E‐fields cancellation. The measured and simulated results show good agreement. The size of the miniaturized antenna is 0.46×0.42×$\times 0.42\times$0.012 λ03$\lambda _0^3$, with a high CM rejection of 31.4 dB achieved.
- Subjects
ANTENNAS (Electronics); SUBSTRATE integrated waveguides
- Publication
Electronics Letters (Wiley-Blackwell), 2023, Vol 59, Issue 14, p1
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/ell2.12892