Compact double‐layer substrate integrated waveguide magic Tee for X‐band applications

Abstract

A substrate integrated waveguide Magic Tee with very compact size and operating over a wide band is proposed. The circuit is made of two stacked substrates connected by cutting a small aperture between them. This solution presents slightly higher complexity compared to a single substrate magic Tee but it avoids the radiation losses because the circuit is completely closed. A simple and effective procedure is used to design the circuit. A prototype is built and experimental results show a good agreement with simulations. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:932–936, 2016

Review of Substrate Integrated Waveguide Circuits for Beam-Forming Networks Working in X-Band

“…In the literature there were three different approaches to solve this problem. The first one made use of two different substrates [44][45][46], the second approach consisted of connecting the sum and difference circuits by means of a slotline, and the third approach made use of a phase shifter to adjust the phase of one output [47,48]. In the first case, the device had to be built by attaching together two substrates, using screws for example.…”

“…In [46], a double-layer magic tee was designed starting from the H-plane T junction ( Figure 10a). This junction matched well and contained a small slot that was used to connect the difference port fabricated in another board (Figure 10b).…”

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“…Substrate integrated waveguide (SIW) technology allows to obtain an efficient and low-cost three-dimensional bounding of electromagnetic power via the planar printed board circuits (PCB) technology [22][23][24][25][26][27][28]. The metallic cavity improves the radiation performance of the patch antenna, increases the bandwidth and reduces the losses due to surface waves reduction [29].…”