Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066910
Ahmed Mohammed Refaey, I. Eshrah, Mohamed A. Moharram Hassan
A wideband septum-based orthomode transducer (OMT) is designed to characterize and measure dual circularly polarized 5G communication systems. The OMT is designed for the n260 (37–40 GHz) and n259 (39.5-43.5 GHz) bands. The fabricated OMT has 20% fractional bandwidth (36–44 GHz) with a measured return loss and isolation better than 18 dB. The OMT achieves a simulated cross polarization discrimination (XPD) and axial ratio (AR) of 42.5 dB and 0.45 dB respectively. Good agreement between simulations and measurements is obtained.
{"title":"Design of a Wideband Circularly Polarized Orthomode Transducer for 5G Applications","authors":"Ahmed Mohammed Refaey, I. Eshrah, Mohamed A. Moharram Hassan","doi":"10.1109/IMAS55807.2023.10066910","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066910","url":null,"abstract":"A wideband septum-based orthomode transducer (OMT) is designed to characterize and measure dual circularly polarized 5G communication systems. The OMT is designed for the n260 (37–40 GHz) and n259 (39.5-43.5 GHz) bands. The fabricated OMT has 20% fractional bandwidth (36–44 GHz) with a measured return loss and isolation better than 18 dB. The OMT achieves a simulated cross polarization discrimination (XPD) and axial ratio (AR) of 42.5 dB and 0.45 dB respectively. Good agreement between simulations and measurements is obtained.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133720172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066882
A. M. E. Abounemra
In this paper a 150 nm GaN on Si technology design-based Ka-band monolithic microwave integrated circuit (MMIC) low noise amplifier (LNA) for 5G front-end wireless systems is presented. The LNA is created using a multi-stage noise matching approach realized with a topology of series inductive degeneration common source. Using this method, active devices may retain high flat gain while achieving a low noise figure (NF) throughout a larger frequency spectrum. The LNA has a typical small-signal gain of over 12 dB, according to the post-layout simulation, while a noise figure performance of less than 2.9 dB was achieved over a bandwidth from 22 to 30 GHz. The proposed LNA linearity characterization indicates that the third-order intercept point (OIP3) of 28 dBm was obtained, respectively. The Ka-band MMIC LNA die has a full size of $900times 900mumathrm{m}^{2}$ including the pads.
本文提出了一种基于150 nm GaN on Si技术设计的用于5G前端无线系统的ka波段单片微波集成电路(MMIC)低噪声放大器(LNA)。该滤波器采用串联感应退化共源拓扑结构实现多级噪声匹配。使用这种方法，有源器件可以保持高平坦增益，同时在更大的频谱范围内实现低噪声系数(NF)。根据布局后仿真，LNA具有超过12 dB的典型小信号增益，而在22至30 GHz的带宽范围内，噪声系数性能低于2.9 dB。所提出的LNA线性度表征表明，得到的三阶截距点(OIP3)分别为28 dBm。ka波段MMIC LNA芯片的全尺寸为$900 × 900mu mathm {m}^{2}$(包括焊盘)。
{"title":"Design of a Ka-Band LNA Based on 150 nm GaN-on-Si Technology","authors":"A. M. E. Abounemra","doi":"10.1109/IMAS55807.2023.10066882","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066882","url":null,"abstract":"In this paper a 150 nm GaN on Si technology design-based Ka-band monolithic microwave integrated circuit (MMIC) low noise amplifier (LNA) for 5G front-end wireless systems is presented. The LNA is created using a multi-stage noise matching approach realized with a topology of series inductive degeneration common source. Using this method, active devices may retain high flat gain while achieving a low noise figure (NF) throughout a larger frequency spectrum. The LNA has a typical small-signal gain of over 12 dB, according to the post-layout simulation, while a noise figure performance of less than 2.9 dB was achieved over a bandwidth from 22 to 30 GHz. The proposed LNA linearity characterization indicates that the third-order intercept point (OIP3) of 28 dBm was obtained, respectively. The Ka-band MMIC LNA die has a full size of $900times 900mumathrm{m}^{2}$ including the pads.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132262171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066936
Ahmed Alieldin, Alla M. Eid, A. Salama, A. El-Akhdar
This paper proposes a novel methodology to synthesize a reconfigurable cosecant-squared /pencil beam antenna array for radar systems. The reconfigurability is achieved based on pseudo inverse synthesis. The antenna array can transform its radiation pattern from cosecant-squared to pencil beam and vice versa by changing solely the phases of only half of the array antenna elements. To validate the methodology, a 14-element antenna array is designed to form either a cosecant-squared or pencil beam radiation pattern utilizing the same feeding network. By changing the feeding phases of only 7 antenna elements, full reconfigurability is achieved. This efficient and simple remodelling technique makes the proposed methodology a good candidate to build a reconfigurable antenna array for radar systems.
{"title":"A Reconfigurable Cosecant-Squared/ Pencil Beam Antenna Array for Radar Systems","authors":"Ahmed Alieldin, Alla M. Eid, A. Salama, A. El-Akhdar","doi":"10.1109/IMAS55807.2023.10066936","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066936","url":null,"abstract":"This paper proposes a novel methodology to synthesize a reconfigurable cosecant-squared /pencil beam antenna array for radar systems. The reconfigurability is achieved based on pseudo inverse synthesis. The antenna array can transform its radiation pattern from cosecant-squared to pencil beam and vice versa by changing solely the phases of only half of the array antenna elements. To validate the methodology, a 14-element antenna array is designed to form either a cosecant-squared or pencil beam radiation pattern utilizing the same feeding network. By changing the feeding phases of only 7 antenna elements, full reconfigurability is achieved. This efficient and simple remodelling technique makes the proposed methodology a good candidate to build a reconfigurable antenna array for radar systems.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130763592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066947
Ibrahim N. Alquaydheb, Saleh Alfawaz, Sara Ghayouraneh, Amirreza Ghadimi Avval, S. El-Ghazaly
This paper discusses a simple choke antenna composed mainly of a circular waveguide surrounded by a choke. An analytical model that plots field patterns and currents of the choke is presented. Also, this model can obtain the total amplitude and phase of antenna far-field radiation characteristics to get the desired gain, half-power beamwidth, or radiation maxima direction for applications such radar systems and satellite communications. A comparison in CPU time between this model and the finite element method is introduced. At a selected operating frequency of 2.45 GHz, finite element method solver Ansys HFSS is utilized to validate the resulting radiation patterns of the proposed analytical model and to export the choke currents.
{"title":"Optimization of Choke Antenna Aperture Radiation Pattern","authors":"Ibrahim N. Alquaydheb, Saleh Alfawaz, Sara Ghayouraneh, Amirreza Ghadimi Avval, S. El-Ghazaly","doi":"10.1109/IMAS55807.2023.10066947","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066947","url":null,"abstract":"This paper discusses a simple choke antenna composed mainly of a circular waveguide surrounded by a choke. An analytical model that plots field patterns and currents of the choke is presented. Also, this model can obtain the total amplitude and phase of antenna far-field radiation characteristics to get the desired gain, half-power beamwidth, or radiation maxima direction for applications such radar systems and satellite communications. A comparison in CPU time between this model and the finite element method is introduced. At a selected operating frequency of 2.45 GHz, finite element method solver Ansys HFSS is utilized to validate the resulting radiation patterns of the proposed analytical model and to export the choke currents.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121704442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066908
Nasser Ojaroudi, Ahmed S. I. Amar, Mohammad Alibakhshikenari, H. El-Hennawy, M. Darwish
A co-planar waveguide (CPW)-fed MIMO antenna design with compact resonators and suitable features is introduced for smartphone applications. Two rows of antennas are mounted on two different sides of the mainboard to arrange an 8×8 MIMO configuration. The antenna elements of the introduced MIMO design have been etched onto the same layer as the ground plane. The antenna element contains a T-ring CPW-fed resonator operating at the frequency range of 3.2-4.2 GHz of sub 6 GHz 5G cellular communications. The designed array occupies a relatively small area of the board. Its critical properties are studied in detail. Due to the arrangement of the CPW-fed resonators, the proposed design is able to operate as two sets of beam-steerable arrays with high-gain radiation. It has been determined that the optimal S-parameters, patterns, efficiency, and gain are all achievable with the planned MIMO array design and meet the needs of future 5G handheld smartphones.
{"title":"A CPW-Fed Antenna Array with MIMO and Phased Array Operations for Sub-6-GHz 5G Smartphones","authors":"Nasser Ojaroudi, Ahmed S. I. Amar, Mohammad Alibakhshikenari, H. El-Hennawy, M. Darwish","doi":"10.1109/IMAS55807.2023.10066908","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066908","url":null,"abstract":"A co-planar waveguide (CPW)-fed MIMO antenna design with compact resonators and suitable features is introduced for smartphone applications. Two rows of antennas are mounted on two different sides of the mainboard to arrange an 8×8 MIMO configuration. The antenna elements of the introduced MIMO design have been etched onto the same layer as the ground plane. The antenna element contains a T-ring CPW-fed resonator operating at the frequency range of 3.2-4.2 GHz of sub 6 GHz 5G cellular communications. The designed array occupies a relatively small area of the board. Its critical properties are studied in detail. Due to the arrangement of the CPW-fed resonators, the proposed design is able to operate as two sets of beam-steerable arrays with high-gain radiation. It has been determined that the optimal S-parameters, patterns, efficiency, and gain are all achievable with the planned MIMO array design and meet the needs of future 5G handheld smartphones.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124079402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066927
Fahd Al-Seba'ey, Randa Elkhosht, H. Hammad
In this paper, a compact horizontally polarized microstrip based directional dipole element is proposed for LoRa applications. The presented dipole element is designed for compactness and efficiency by minimizing the side lobe level (SLL) in the radiation pattern. The dipole element is then used in an omnidirectional ring array antenna unit that is in turn used to construct a five-unit directional linear antenna array system for LoRaWAN base-station applications. The five-unit antenna array system demonstrates high directivity with a simulated gain of 9.5 dBi. Moreover, the omnidirectional unit shows satisfactory matching properties with a return loss value below −14 dB for both single-element and multi-element mode operation. A small antenna footprint was also achieved with the dimensions of the omnidirectional unit being smaller than the operating wavelength of 0.868 GHz.
{"title":"Linearly Polarized Dipole Antenna and Antenna Array for LoRa Base-Station Applications","authors":"Fahd Al-Seba'ey, Randa Elkhosht, H. Hammad","doi":"10.1109/IMAS55807.2023.10066927","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066927","url":null,"abstract":"In this paper, a compact horizontally polarized microstrip based directional dipole element is proposed for LoRa applications. The presented dipole element is designed for compactness and efficiency by minimizing the side lobe level (SLL) in the radiation pattern. The dipole element is then used in an omnidirectional ring array antenna unit that is in turn used to construct a five-unit directional linear antenna array system for LoRaWAN base-station applications. The five-unit antenna array system demonstrates high directivity with a simulated gain of 9.5 dBi. Moreover, the omnidirectional unit shows satisfactory matching properties with a return loss value below −14 dB for both single-element and multi-element mode operation. A small antenna footprint was also achieved with the dimensions of the omnidirectional unit being smaller than the operating wavelength of 0.868 GHz.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115414490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066892
Ismail Dilman, M. N. Akıncı, Cemanur Aydinalp, Sulayman Joof, T. Yilmaz, M. Cayoren
We present an alternative version of the Rational Functional Method (RFM) which can explicitly retrieve the Debye parameters of the material under test (MUT) without any data fitting. A simulation of the open-ended coaxial probe with the MUT is performed to obtain the reflection coefficient from 0.5 to 6 GHz. A newton-based inversion method is used to reconstruct the Debye parameters of the MUT, and the complex dielectric property (CDP) variation on the measurement spectrum is calculated via these model parameters. The error rate for the reference materials formamide, methanol, and chlorobenzene is 2.7-8.6 %. The numerical results show that retrieving Debye parameters with the proposed inversion method is possible.
{"title":"Enforcing Spectral Continuity of Complex Dielectric Permittivity Values For RFM","authors":"Ismail Dilman, M. N. Akıncı, Cemanur Aydinalp, Sulayman Joof, T. Yilmaz, M. Cayoren","doi":"10.1109/IMAS55807.2023.10066892","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066892","url":null,"abstract":"We present an alternative version of the Rational Functional Method (RFM) which can explicitly retrieve the Debye parameters of the material under test (MUT) without any data fitting. A simulation of the open-ended coaxial probe with the MUT is performed to obtain the reflection coefficient from 0.5 to 6 GHz. A newton-based inversion method is used to reconstruct the Debye parameters of the MUT, and the complex dielectric property (CDP) variation on the measurement spectrum is calculated via these model parameters. The error rate for the reference materials formamide, methanol, and chlorobenzene is 2.7-8.6 %. The numerical results show that retrieving Debye parameters with the proposed inversion method is possible.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"184 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116425400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066930
S. El-Khamy, H. F. El-Sayed, A. Eltrass
This paper introduces a new design of wideband planar antenna arrays based on space-filling curves with low Side-Lobe Level (SLL). The unique geometrical features of such arrays are exploited to provide wideband operation and to avoid grating lobes in the radiation pattern even when the minimum spacing between elements is increased to one-wavelength. Three antenna array configurations based on space-filling curve, namely heighway dragon, twindragon and $Z_{2}$ heighway dragon arrays, are investigated and compared for various set of parameter regimes. Results reveal that the introduced array designs offer several highly desirable radiation pattern advantages over their conventional periodic planar array counterparts, including wideband operation, SLL reduction, and grating lobe elimination. This demonstrates the importance of the introduced array configuration as a promising design in modern wireless systems.
{"title":"New Wideband Antenna Arrays with Low Sidelobe Based on Space Filling Curves","authors":"S. El-Khamy, H. F. El-Sayed, A. Eltrass","doi":"10.1109/IMAS55807.2023.10066930","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066930","url":null,"abstract":"This paper introduces a new design of wideband planar antenna arrays based on space-filling curves with low Side-Lobe Level (SLL). The unique geometrical features of such arrays are exploited to provide wideband operation and to avoid grating lobes in the radiation pattern even when the minimum spacing between elements is increased to one-wavelength. Three antenna array configurations based on space-filling curve, namely heighway dragon, twindragon and $Z_{2}$ heighway dragon arrays, are investigated and compared for various set of parameter regimes. Results reveal that the introduced array designs offer several highly desirable radiation pattern advantages over their conventional periodic planar array counterparts, including wideband operation, SLL reduction, and grating lobe elimination. This demonstrates the importance of the introduced array configuration as a promising design in modern wireless systems.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122880435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066923
M. Al Salameh, B. Musa
In this paper, COMSOL Multiphysics software is used to simulate lightning impulse applied to nose, wings, and fuselage of unmanned aerial vehicles (UAVs). Based on that, the electric field levels at different points inside the UAV are computed. Real-world 3D model of UAV is created using SOLIDWORKS software. Since the impulse has no single frequency, the model is used in the time domain to simulate the lightning strike. Furthermore, hardening the UAV to reduce electromagnetic interference (EMI) by shielding against lightning strikes is examined. The results confirm that an overlay of good electric conductor can essentially prevent lightning strikes from entering the UAV, even when necessary narrow seams and holes are not shielded. To show the validity and usefulness of the model, the computed results are compared with measured data where acceptable agreement is observed.
{"title":"COMSOL solutions to EMI hardening of UAVs against lightning strikes","authors":"M. Al Salameh, B. Musa","doi":"10.1109/IMAS55807.2023.10066923","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066923","url":null,"abstract":"In this paper, COMSOL Multiphysics software is used to simulate lightning impulse applied to nose, wings, and fuselage of unmanned aerial vehicles (UAVs). Based on that, the electric field levels at different points inside the UAV are computed. Real-world 3D model of UAV is created using SOLIDWORKS software. Since the impulse has no single frequency, the model is used in the time domain to simulate the lightning strike. Furthermore, hardening the UAV to reduce electromagnetic interference (EMI) by shielding against lightning strikes is examined. The results confirm that an overlay of good electric conductor can essentially prevent lightning strikes from entering the UAV, even when necessary narrow seams and holes are not shielded. To show the validity and usefulness of the model, the computed results are compared with measured data where acceptable agreement is observed.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114808963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-07DOI: 10.1109/IMAS55807.2023.10066894
S. A. Soliman, Eman M. Eldesouki, A. Attiya, A. Freundorfer, Y. Antar
This paper presents the analysis and design of an integrated low-profile circularly-polarized folded reflectarray antenna (FRA) for wireless communication applications in the ku band. The proposed FRA consists of a main reflectarray (MR), a tilted linearly polarized (LP) planar dipole antenna and a transmitarray. The main reflectarray consists of 713 pentagonal patch elements on a grounded dielectric substrate. The reflecting elements are adjusted to produce a 90° phase shift between the reflection coefficients in the two principal planes. On the other hand, the transmitarray consists of conducting circular patches printed on a dielectric slab. The combination of the reflectarray and transmitarray are designed to convert the linearly polarized radiation of the feeding planar dipole antenna to circular polarization. In this work a small focal to diameter ratio (F/ D) is chosen to be 0. 4 to reduce the overall antenna size. This design operates in the band from 11.5 to 12.5 GHz and the results show that the maximum antenna gain 22 dBi and the AR is 1.17 dB at 12 GHz.
{"title":"Circularly Polarized Folded Reflectarray Antenna","authors":"S. A. Soliman, Eman M. Eldesouki, A. Attiya, A. Freundorfer, Y. Antar","doi":"10.1109/IMAS55807.2023.10066894","DOIUrl":"https://doi.org/10.1109/IMAS55807.2023.10066894","url":null,"abstract":"This paper presents the analysis and design of an integrated low-profile circularly-polarized folded reflectarray antenna (FRA) for wireless communication applications in the ku band. The proposed FRA consists of a main reflectarray (MR), a tilted linearly polarized (LP) planar dipole antenna and a transmitarray. The main reflectarray consists of 713 pentagonal patch elements on a grounded dielectric substrate. The reflecting elements are adjusted to produce a 90° phase shift between the reflection coefficients in the two principal planes. On the other hand, the transmitarray consists of conducting circular patches printed on a dielectric slab. The combination of the reflectarray and transmitarray are designed to convert the linearly polarized radiation of the feeding planar dipole antenna to circular polarization. In this work a small focal to diameter ratio (F/ D) is chosen to be 0. 4 to reduce the overall antenna size. This design operates in the band from 11.5 to 12.5 GHz and the results show that the maximum antenna gain 22 dBi and the AR is 1.17 dB at 12 GHz.","PeriodicalId":246624,"journal":{"name":"2023 International Microwave and Antenna Symposium (IMAS)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124431223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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