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Differential microstrip line to waveguide transitions for D-band based on irises
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- Journal:
- International Journal of Microwave and Wireless Technologies / Volume 17 / Issue 9 / November 2025
- Published online by Cambridge University Press:
- 12 February 2026, pp. 1725-1732
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- Article
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D-band waveguide transitions that combine a resonant patch on the printed circuit board with multiple waveguide irises are presented and shown to achieve a relative bandwidth of up to 35%. The irises implement an impedance-matching network that is described by a lumped-element circuit model. Parametric sweeps and Monte Carlo simulations quantify the influence of iris dimensions and manufacturing tolerances. The transitions’ group delay is characterized, and its influence on time-domain signals is demonstrated. As an application example, a transition design with six irises is integrated into a multichannel radar frontend with
$40\,\mathrm{GHz}$ bandwidth, and measured range profiles are presented. The derived design guidelines enable straightforward customization of iris-based transitions for various applications and frequency bands.
