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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.

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