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RISS 인기검색어
- 검색키워드
- 저자 : Ali‑Reza Moznebi (검색결과 2 건)
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Ali-Reza Moznebi,Kambiz Afrooz,Mostafa Danaeian 한국전자통신연구원 2023 ETRI Journal Vol.45 No.2
A filtering power divider based on air-filled substrate-integrated waveguide (AFSIW) technology is proposed in this study. The AFSIW structure is used in the proposed filtering power divider for substantially reducing the transmission losses. This structure occupies a large area because of the use of air as a dielectric instead of typical dielectric materials. A filtering power divider provides power division and frequency selectivity simultaneously in a single device. The proposed filtering power divider comprises three AFSIW cavities. The filtering function is achieved using symmetrical inductive posts. The input and output ports of the proposed circuit are realized by directly connecting coaxial lines to the AFSIW cavities. This transition from the coaxial line to the AFSIW cavity eliminates the additional transitions, such as AFSIW-SIW and SIW-conductor-backed coplanar waveguide, applied in existing AFSIW circuits. The proposed power divider with a second-order bandpass filtering response is fabricated and measured at 5.5 GHz. The measurement results show that this circuit has a minimum insertion loss of 1 dB, 3-dB fractional bandwidth of 11.2%, and return loss exceeding 11 dB.
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Mostafa Danaeian,Esmail Zarezadeh,Mohammad Hossein Gholizadeh,Ali‑Reza Moznebi,Jafar Khalilpour 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.1
A compact and high-rejection ultra-wideband (UWB) microstrip band-pass flter is proposed by using the multi-mode resonator (MMR) technique. The proposed MMR structure is realized by three open stubs-loaded and two short stubs-loaded and a high impedance microstrip line. Five modes, including two odd modes and three even modes could be designed within the UWB band. By resizing the dimensions of the stubs, the resonant modes of the MMR structure are arranged wider bandpass which the passband selectivity with this confguration signifcantly improved. By this confguration, the even modes can be fexibly controlled, while the odd modes remain the same. The proposed flter has a passband covers 4.1–10.6 GHz and its measured 3 dB fractional bandwidth is about 89%. In order to validate the performance of the proposed technique, the designed UWB band-pass flter is fabricated and the experimental verifcation is provided. A good agreement has been found between simulation and measurement’s results. To our knowledge, the size of the proposed UWB flter is small in comparison with known similar flters.
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