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Reconfigurable 3/6 dB Novel Branch Line Coupler

Open Journal of Antennas and Propagation 2017年第1期5卷 7-22页

作者： tamer gaber abouelnaga Ashraf Shawky Mohra Microstrip Circuits Department Electronics Research Institute Giza Egypt Faculty of Engineering Benha University Qalyubia Egypt

In this paper, a new idea of reconfigurable 3/6 dB branch line coupler is proposed. The proposed coupler is tuned through a simple open and short circuit at the coupler’s branches’ edges. At the short edges case, a 3 dB branch line coupler is obtained. In this case, the coupler’s branches are considered as microstrip transmission lines with 0.3 mm slot width which is etched in each coupler’s branch. At the open edges case, the coupler’s branches are considered as asymmetric coupled microstrip lines. In this case, a 6 dB branch line coupler is obtained. Both CST and IE3D simulators are used to optimize the reconfigurable 3/6 dB branch line coupler dimensions. As a prototypes, two BLCs are designed, analyzed and tested at the “on” and “off” states at 2.5 GHz. The measured S-parameters confirm the proposed concept of the reconfigurable 3/6 dB branch line coupler.

关键词： Branch Line Coupler Microstrip Lines Asymmetric Coupled Microstrip Lines 3/6 dB Coupler

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High Gain UWB Four Elements Antenna Array for C-Band and X-Band Application

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Open Journal of Antennas and Propagation 2020年第2期8卷 19-29页

作者： tamer gaber abouelnaga Mazhar Basyouni Tayel Asmaa Fereg Desouky Microstrip Circuits Department Electronic Research Institute ERI El Nozha El Gadida Cairo Egypt Electrical Department Faculty of Engineering Alexandria University Alexandria Egypt Communication Department Higher Institute of Engineering and Technology HIET Kafr Elsheikh Egypt

The C-band is allocated for commercial telecommunications via satellites. Amateur satellite operations in the frequency range 5.830 to 5.850 GHz for down-links and 5.650 to 5.670 GHz for up-links are allowed by International Telecommunication Union. The X-band is used for terrestrial broadband communication, radar applications, and portions of the X-band are assigned for deep space telecommunications. In this paper, a design of 4 × 1 Ultra Wide Band (UWB) antenna array for C-band and X-band applications is introduced. Metamaterial sixteen-unit cells are incorporated into each antenna element for radiation characteristics enhancement purposes. Permeability and permittivity of metamaterial unit cells are obtained all over the operating bandwidth. UWB unequal power divider is used to feed the proposed four elements antenna array based on Chebyshev excitation method. The proposed antenna has a suitable 3 dB beam width and gains all over the operating bandwidth which extends from 5.6 GHz to 10.9 GHz. The proposed antenna covers 60% and 72.5% of the C-band and X-band, respectively. The proposed antenna is fabricated, measured, and good agreement is obtained between simulated and measured results. The obtained performance ensures the suitability of the proposed antenna array for C-band and X-band applications.

关键词： C-Band X-Band Metamaterial Antenna Array UWB

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