Design of a Bethe‐hole directional coupler using substrate integrated waveguide technique

Abstract

design the feeding network, the proposed array antenna can achieve a quite compact size to be easily integrated within the WLAN/RFID systems as a transmitting antenna. With the help of such miniaturized feeding network, the array is capable of broadening the operating bandwidth for practical application so that the effect due to the frequency shifting caused by the transmitter casing can be better solved. Compared to previous series-fed array designs, the proposed structure can not only possess an even more compact size but also implement an adequate half-power beamwidth with good SLL for practical application. As a result, large communication coverage suitable for WLAN/RFID operations can be obtained because of good radiation performance in our array design. For these reasons, the proposed microstrip array antenna will be a promising solution possible for integration into the WLAN/RFID systems as a transmitting antenna.ABSTRACT: This article proposes the design of a Bethe-hole (BH) directional coupler using substrate integrated waveguide (SIW) technique. The design can readily be coupled with, for instance, an antenna and is therefore suitable for millimeter-wave communication systems. Good agreements have been achieved between simulated and experimental results for a 25-dB BH SIW coupler operating in the X-band. Directivity greater than 20-dB and a coupling of 24.7 dB were obtained.ABSTRACT: This article presents a new reconfigurable DVB-H antenna for a portable TV or a tablet PC device. The antenna consists in a folded monopole loaded by a diode varactor combined with an open stub used to match the antenna. Design procedure and equivalent model are presented. A prototype is realized and measured; return loss and efficiency are presented. A minimal total efficiency of 27% is reported at the whole DVB-H band.

Design of low profile wideband high power waveguide to substrate integrated waveguide coupler

“…Simple structure, easy to installation of SIW board, wideband (48%), low deviation (±0.5 dB) and high coupling are the advantage of the proposed coupler compare with the references which are presented in literature. Comparison between the proposed waveguide to SIW coupler and state of the arts works is shown in Table 1 which clearly proves its significantly larger bandwidth rather than 6,10,11 . Moreover its coupling is 8 dB lower than 11 (as the best case).…”

“…A high power wideband coaxial to coplanar directional coupler is proposed in 3 which has a 5 dB fluctuation in the beginning of its operation frequency band. By using SIW technology some novel SIW couplers have been proposed in recent years 4–6 . Ease of fabrication, ease of integration with other circuits and low cost compare with the waveguide couplers are the main advantage of substrate integrated waveguide (SIW) couplers.…”

“…By using SIW technology some novel SIW couplers have been proposed in recent years. [4][5][6] Ease of fabrication, ease of integration with other circuits and low cost compare with the waveguide couplers are the main advantage of substrate integrated waveguide (SIW) couplers. Based on aperture coupling theory, 7,8 waveguide to microstrip coupling via an aperture has been realized for the first time.…”

X-Band Multi-Hole Directional Coupler with Folded Substrate-Integrated Waveguide

“…The beth-hole SIW coupler was designed and reported in Amine et al (2011), and since multi-hole couplers have a larger bandwidth, the theory of multi-hole waveguide couplers was been used in the SIW technology in that study to realize a broadband SIW coupler.…”

Wideband Directional Coupler for Millimeter Wave Application based on Substrate Integrated Waveguide

“…They are also noticed for 180º phase delay such as Narrow wall directional coupler [16] Half Mode Substrate Integrated Waveguide (HMSIW) for 180º phase delay [17], non-uniform width [18]. Furthermore, multi-layer SIW structures are attractive for directional coupler based on coupling from Bethe hole [19][20]. Apparently, in single layer SIW the Bethe hole made between two waveguide by the elimination of some vias.…”