In‐line stepped ridge coaxial‐to‐rectangular waveguide transition with capacitive coupling

Abstract

An original in‐line coaxial‐to‐rectangular waveguide transition including stepped ridged sections is presented. This device differs from the state of the art because of the coaxial inner conductor not being in electrical contact with the ridge, leading to considerable mechanical advantages. In addition to this, capacitive coupling can extend the bandwidth even with a few matching sections when compared with the traditional counterpart presenting DC contact with the first ridge. An ultra‐compact transition is designed, manufactured, and tested in back‐to‐back configuration. From measured data, a return loss better than 20 dB on a bandwidth of 1.27 GHz (12.2%) is observed in this configuration. An average insertion loss of 0.11 dB can be derived for the standalone transition.

Computational Design of an In-Line Coaxial-to-Circular Waveguide Adapter with More Than an Octave Bandwidth

“…For the conversion between the coaxial TEM mode and the rectangular TE 10 mode, a stepped-ridge transformer is employed. Existing structures for TEM-TE 10 mode conversion include an L probe [22], a stepped L probe [23], a continuously tapered ridge transformer [24] and a stepped-ridge transformer [25][26][27][28][29][30][31][32][33][34]. A survey of the literature reveals that the stepped-ridge transformer is a preferred geometry for broadband transitions, which has also been adopted in this work.…”

Wideband Rectangular Waveguide to Substrate Integrated Waveguide (SIW) E-Plane T-Junction

“…Screws are used to guarantee good electrical contact between the two parts. The adopted manufacturing process, detailed in [13], minimizes cost and prototyping time, while ensuring good performance, as already verified in [14][15][16]. The SIW is manufactured with standard PCB technology and joint to a mechanical supporting structure integrating the RWG section by means of six mounting screws.…”

Broadband Right-Angle Rectangular Waveguide to Substrate Integrated Waveguide Transition with Distributed Impedance Matching Network

“…Further details on this SLA additive manufacturing and metallization are discussed in [26]. This process was adopted in order to minimize time and costs and has exhibited good results for other proof-of-concept prototypes [27,28]. The SIW circuit was manufactured with standard PCB technology and then connected to the RWG, the latter being integrated in a mechanical support structure with mounting screws tightened in six holes drilled in the PCB.…”