Wideband In-Line Waveguide-to-Microstrip Transition With Antisymmetric Rectangular Probes
IEEE Microwave and Wireless Technology Letters(2024)
Abstract
In this letter, a simple and clear in-line waveguide-to-microstrip (MS) transition using a pair of antisymmetric rectangular probes is presented for monolithic millimeter-wave integrated circuit (MMIC) packaging. The two rectangular probes are arranged on both sides of a substrate within the
$E$
-plane waveguide. The probe tips are close to two sides of the waveguide and their roots overlap, which help them gradually rotate the coupled
$E$
-field from the waveguide into the microstrip. The probe tip is one-quarter wavelength away from the back-short for the maximum
$E$
-field coupling. Moreover, quarter-wavelength lines are used to match the probe to the 50-
$\Omega$
line in a wideband. To verify the package effect, the MMIC was replaced by a 50-
$\Omega$
microstrip, and a passive back-to-back prototype was demonstrated. In the entire
$W$
-band (75–110 GHz), the back-to-back package achieves a return loss of higher than 13 dB with an average insertion loss of 1.29 dB.
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Key words
In-line waveguide transition,millimeter wave,monolithic millimeter-wave integrated circuit (MMIC) package,rectangular probes,wideband
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