Wideband 220 – 330 GHz Turnstile OMT Enabled by Silicon Micromachining

Abstract

Abstract-This paper is the first publication on the first turnstile-junction orthogonal mode transducer (OMT) above 110 GHz, which is enabled by silicon micromachining. In contrast to other OMT concepts, turnstile OMTs are wideband and allow for co-planar ports, but require accurate and complex fabrication and have therefore, to the best of our knowledge, not been implemented above 110 GHz in any technology. As shown in this paper, the fabrication and assembly accuracy of silicon micromachining enables the realization of such complex OMT designs at 220 -330 GHz with excellent performance. The measured insertion loss is better than 0.7 dB for the whole waveguide band, with mean values of 0.34 dB and 0.48 dB for the vertical and horizontal polarizations, respectively. The measured return loss for both polarizations, even with an openended common port, is better than 14 dB for the whole waveguide band, and an average level of 18 dB. An estimation of the worst-case cross-polarization level, derived from measurements, results in at least 20 dB for the whole waveguide band, with an average of 25 dB for the upper half of the band.

Compact Silicon-Micromachined Wideband 220–330-GHz Turnstile Orthomode Transducer

“…The turnstile OMT presented in this paper is designed for full-band operation in the WM864 band, 220 -330 GHz, and is, to the best of our knowledge, the first broadband OMT implemented by micromachining, and only the second attempt (besides [12]) to implement a turnstile OMT at frequencies above 110 GHz. Preliminary return loss measurement results with open-ended and shorted common-port configurations, for validating the fabrication approach, were shown in [15]. In the present paper, full characterization results including insertion loss, return loss for both polarizations, and the crosspolarization levels are presented for the first time.…”

Millimeter-Wave 3-D-Printed Antenna Array Based on Gap-Waveguide Technology and Split E-Plane Waveguide

“…In order to verify the existence of leakage in the upper frequency range of the antenna array two kind of measurements are carried out. First one consists of measuring the reflection coefficient of the antenna array when the antennas are short-circuited [28]. This measurement contains twice the insertion losses provided by the fabricated antenna array.…”

Computer‐aided development and experimental investigation of a double‐ridged orthomode transducer for modern satellite and space communication systems

“…In order to demonstrate advantages in performance of proposed antenna system based on developed doubleridged OMT let us compare it with several existent counterparts based on other types of waveguide polarization duplexers. [104][105][106][107] Achieved characteristics of bandwidth, matching and isolation are summarized in Table 1.…”