In this paper, a method is proposed to improve the strongest user's channel gain and thus enhance the system secrecy sum rate (SSR) of the Non-orthogonal multiple access (NOMA) system using a reconfigurable intelligent surface (RIS). Based on the observation that the decoding process of NOMA system utilizes the power allocation differences among multiple users and the SSR largely depends on the strongest user's channel gain, an optimal power allocation optimization problem is constructed under quality of service (QoS) and total power constraints. Then a low-complexity relaxation based algorithm is proposed to improve the channel gain of the strongest user by optimizing the RIS phase, thereby enhancing the SSR of the system. The final simulation results show that the proposed method not only maintains good performance but also reduces computational complexity by about 2 dB.
{"title":"Secrecy sum rate maximization of RIS assisted downlink NOMA system","authors":"Zhitao Liu;Yongkang Peng;Youming Li;Yongfeng Du","doi":"10.1029/2024RS008011","DOIUrl":"https://doi.org/10.1029/2024RS008011","url":null,"abstract":"In this paper, a method is proposed to improve the strongest user's channel gain and thus enhance the system secrecy sum rate (SSR) of the Non-orthogonal multiple access (NOMA) system using a reconfigurable intelligent surface (RIS). Based on the observation that the decoding process of NOMA system utilizes the power allocation differences among multiple users and the SSR largely depends on the strongest user's channel gain, an optimal power allocation optimization problem is constructed under quality of service (QoS) and total power constraints. Then a low-complexity relaxation based algorithm is proposed to improve the channel gain of the strongest user by optimizing the RIS phase, thereby enhancing the SSR of the system. The final simulation results show that the proposed method not only maintains good performance but also reduces computational complexity by about 2 dB.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Radio occultation observation has garnered significant attention owing to its low-cost, all-weather, and global coverage feature. However, traditional occultation inversion methods lead to error accumulation due to assumptions that are not entirely suitable in the real ionospheric environment, resulting in poor performance in the low ionosphere (D, E layers). In this article, we propose a new method for inverting the electron density in low ionosphere using high-precision 50 Hz occultation data. This method can eliminate the fixed constant term of 50 Hz data and obtain a sharper weighting function through epoch differencing. The inversion results have a good consistency with the results of the ionosonde, with a correlation coefficient of 0.92 and a determination coefficient of 0.85. In addition, the new method can retrieve local details of electron density profiles and capture sporadic E layer (Es), providing support for the study of Es layer morphology and structure.
{"title":"A low ionosphere occultation observation method based on differential weight separation","authors":"Jialiang Zhong;Sijia Han;Caiyun Wang;Wei Guo","doi":"10.1029/2024RS008152","DOIUrl":"https://doi.org/10.1029/2024RS008152","url":null,"abstract":"Radio occultation observation has garnered significant attention owing to its low-cost, all-weather, and global coverage feature. However, traditional occultation inversion methods lead to error accumulation due to assumptions that are not entirely suitable in the real ionospheric environment, resulting in poor performance in the low ionosphere (D, E layers). In this article, we propose a new method for inverting the electron density in low ionosphere using high-precision 50 Hz occultation data. This method can eliminate the fixed constant term of 50 Hz data and obtain a sharper weighting function through epoch differencing. The inversion results have a good consistency with the results of the ionosonde, with a correlation coefficient of 0.92 and a determination coefficient of 0.85. In addition, the new method can retrieve local details of electron density profiles and capture sporadic E layer (Es), providing support for the study of Es layer morphology and structure.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-14"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Nieckarz;M. Golkowski;J. Kubisz;M. Ostrowski;A. Michalec;J. Mlynarczyk;J. Lichtenberger;A. Maxworth
The Extremely Low Frequency band (ELF: 0.03-1,000 Hz) electromagnetic signals from thunderstorm lightning discharges can propagate around the globe in the Earth-ionosphere resonance cavity and thus be used for ionosphere monitoring. We use ELF observations of impulses detected by the World Wide Lightning Location Network (WWLLN) to investigate ELF propagation velocity and arrival azimuth under diurnal changes over 2 days in September 2023. Also, temporary effects of solar flares' ionizing fluxes are monitored, leading to increase of the ELF signal propagation speed in proportion to the X-ray flux intensity. We present a simple method for automatic and large-scale analysis, utilizing data from two registration systems (our ELF reciever and WWLLN) and enabling easy evaluation of changes in wave propagation speed. Comparative analysis of WWLLN identified impulses generated in Africa and America reveals varying effects of signal refraction, with increased azimuth changes for signals propagating across the ionospheric ionization gradients associated with the day/night terminator. The method has a potential to become a standard tool for the analysis and monitoring of the lower layers of the ionosphere.
{"title":"Monitoring global ionospheric conditions with electromagnetic lightning impulses registered in extremely low frequency measurements","authors":"Z. Nieckarz;M. Golkowski;J. Kubisz;M. Ostrowski;A. Michalec;J. Mlynarczyk;J. Lichtenberger;A. Maxworth","doi":"10.1029/2024RS008140","DOIUrl":"https://doi.org/10.1029/2024RS008140","url":null,"abstract":"The Extremely Low Frequency band (ELF: 0.03-1,000 Hz) electromagnetic signals from thunderstorm lightning discharges can propagate around the globe in the Earth-ionosphere resonance cavity and thus be used for ionosphere monitoring. We use ELF observations of impulses detected by the World Wide Lightning Location Network (WWLLN) to investigate ELF propagation velocity and arrival azimuth under diurnal changes over 2 days in September 2023. Also, temporary effects of solar flares' ionizing fluxes are monitored, leading to increase of the ELF signal propagation speed in proportion to the X-ray flux intensity. We present a simple method for automatic and large-scale analysis, utilizing data from two registration systems (our ELF reciever and WWLLN) and enabling easy evaluation of changes in wave propagation speed. Comparative analysis of WWLLN identified impulses generated in Africa and America reveals varying effects of signal refraction, with increased azimuth changes for signals propagating across the ionospheric ionization gradients associated with the day/night terminator. The method has a potential to become a standard tool for the analysis and monitoring of the lower layers of the ionosphere.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-9"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Salah;M. Madi;M. El Abbasi;M. Moussa;A. Daher;M. Hussein;K. Kabalan
This paper presents a new microstrip patch antenna inspired by the iconic Burj Khalifa, Dubai's world's tallest skyscraper. The antenna design focuses on being compact, lightweight, cost-effective, and versatile. Simulated through HFSS software, the patch antenna demonstrates a multi-frequency operation. Fabricated on a double-sided copper FR4 epoxy PCB (4 × 8 cm2, 1.6 mm thickness) using a coaxial probe feeding method, it achieves a gain exceeding 7 dB at 7 GHz. Prototypes show excellent consistency between measured and simulated reflection coefficients and gains at 4.8, 5.7, and 7 GHz. Two additional designs are presented to adjust the resonance frequency, making it suitable for biomedical sensors, WIFI, and point-to-point microwave links. One design involves adding a short slot that is close to the feed point, while the other design includes a pair of varactors. Both designs create a reconfigurable microstrip antenna with electromagnetic characteristics that can be adjusted to increase its electrical length. The antenna resonates at 4.8 GHz. The slotted short patch shifts the resonance to 3.1 GHz, and the varactor patch shifts the resonance frequency to 2.1 GHz. When the DC reverse bias voltage of the varactors varies from 0 to 6 V, the gain improves to 15.2 dB.
{"title":"Burj Khalifa-inspired reconfigurable microstrip patch antenna for wireless solutions","authors":"J. Salah;M. Madi;M. El Abbasi;M. Moussa;A. Daher;M. Hussein;K. Kabalan","doi":"10.1029/2024RS008114","DOIUrl":"https://doi.org/10.1029/2024RS008114","url":null,"abstract":"This paper presents a new microstrip patch antenna inspired by the iconic Burj Khalifa, Dubai's world's tallest skyscraper. The antenna design focuses on being compact, lightweight, cost-effective, and versatile. Simulated through HFSS software, the patch antenna demonstrates a multi-frequency operation. Fabricated on a double-sided copper FR4 epoxy PCB (4 × 8 cm<sup>2</sup>, 1.6 mm thickness) using a coaxial probe feeding method, it achieves a gain exceeding 7 dB at 7 GHz. Prototypes show excellent consistency between measured and simulated reflection coefficients and gains at 4.8, 5.7, and 7 GHz. Two additional designs are presented to adjust the resonance frequency, making it suitable for biomedical sensors, WIFI, and point-to-point microwave links. One design involves adding a short slot that is close to the feed point, while the other design includes a pair of varactors. Both designs create a reconfigurable microstrip antenna with electromagnetic characteristics that can be adjusted to increase its electrical length. The antenna resonates at 4.8 GHz. The slotted short patch shifts the resonance to 3.1 GHz, and the varactor patch shifts the resonance frequency to 2.1 GHz. When the DC reverse bias voltage of the varactors varies from 0 to 6 V, the gain improves to 15.2 dB.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-15"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A wideband full-metal cavity-backed antenna with elliptical coupling slot and elliptical aperture is proposed. The antenna consists of two elliptical structures, a coupling slot and a radiating aperture, which are placed on the feed waveguide side and the load side of a rectangular metal cavity resonator, respectively. By using an elliptical slot/aperture, the impedance bandwidth and gain of the antenna are found to be considerably improved in the same footprint and without increasing complexity compared to rectangular slot/aperture and also circular aperture. A prototype of the proposed wideband antenna is fabricated by using the additive manufacturing techniques of 3D printing with polylactic acid (PLA) material, which is covered with aluminum tape to validate the design at Ku-band for satellite communication (SatCom). The measured results show that the antenna has an impedance bandwidth of 4 GHz (10.86–14.86 GHz for |S11| < —15 dB), which gives a fractional bandwidth (FBW) of 31.1%. With low cross-polarization being less than — 25 dB at broadside, the antenna has a peak gain of 9 dBi. The proposed antenna is also compact, with a total volume of about 1.1λ03 at the center frequency.
{"title":"Compact and wideband cavity-backed antenna with elliptical coupling slot and elliptical aperture for satellite communications transceiver applications","authors":"Y. Asci;C. Turkmen;M. Secmen","doi":"10.1029/2024RS008120","DOIUrl":"https://doi.org/10.1029/2024RS008120","url":null,"abstract":"A wideband full-metal cavity-backed antenna with elliptical coupling slot and elliptical aperture is proposed. The antenna consists of two elliptical structures, a coupling slot and a radiating aperture, which are placed on the feed waveguide side and the load side of a rectangular metal cavity resonator, respectively. By using an elliptical slot/aperture, the impedance bandwidth and gain of the antenna are found to be considerably improved in the same footprint and without increasing complexity compared to rectangular slot/aperture and also circular aperture. A prototype of the proposed wideband antenna is fabricated by using the additive manufacturing techniques of 3D printing with polylactic acid (PLA) material, which is covered with aluminum tape to validate the design at Ku-band for satellite communication (SatCom). The measured results show that the antenna has an impedance bandwidth of 4 GHz (10.86–14.86 GHz for |S<inf>11</inf>| < —15 dB), which gives a fractional bandwidth (FBW) of 31.1%. With low cross-polarization being less than — 25 dB at broadside, the antenna has a peak gain of 9 dBi. The proposed antenna is also compact, with a total volume of about 1.1λ<inf>0</inf><sup>3</sup> at the center frequency.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-13"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yazan M. Allawi;Eman M. Moneer;Modar Shbat;Walid M. Dyab;Mosab J. Banisalman;Norah M. Alwadai
This paper presents the design and optimization of a low-cost, 5-m radio telescope developed at Princess Nourah University (PNU), focusing on the 1,420 MHz spectral line of neutral hydrogen (HI) for studying the structure and dynamics of the Milky Way galaxy. The design process integrates key principles of radio telescope engineering, including the optimization of the parabolic dish's geometry, reflectivity, and feed horn design and positioning. Key design outcomes include achieving a sensitivity of 19.63 m2 and an angular resolution of 2.94° providing our telescope with the ability to detect faint cosmic signals. Additionally, the focal length was optimized at 1.75 m with conical feed horn of circular aperture radius of 81.7 mm providing a directivity of 6.47 dB and an aperture efficiency of 51% achieving semi-optimal illumination for the designed reflector to minimize the signal loss. The resulting telescope gain of approximately 35 dB supports clear signal capture within the required frequency range. These performance metrics were verified through both simulations and experimental observations, confirming the high performance of our proposed radio telescope design. The advantages of this design include its affordability, replicability, and suitability for educational and research purposes, making it an accessible tool for radio astronomy studies in developing regions. The proposed radio telescope offers a cost-effective solution for institutions seeking to engage in astronomical research and develop hands-on learning experiences in antenna design and signal processing.
{"title":"Design and optimization of a low-cost 5-m radio telescope at princess Nourah university (PNU), Saudi Arabia","authors":"Yazan M. Allawi;Eman M. Moneer;Modar Shbat;Walid M. Dyab;Mosab J. Banisalman;Norah M. Alwadai","doi":"10.1029/2024RS008170","DOIUrl":"https://doi.org/10.1029/2024RS008170","url":null,"abstract":"This paper presents the design and optimization of a low-cost, 5-m radio telescope developed at Princess Nourah University (PNU), focusing on the 1,420 MHz spectral line of neutral hydrogen (HI) for studying the structure and dynamics of the Milky Way galaxy. The design process integrates key principles of radio telescope engineering, including the optimization of the parabolic dish's geometry, reflectivity, and feed horn design and positioning. Key design outcomes include achieving a sensitivity of 19.63 m<sup>2</sup> and an angular resolution of 2.94° providing our telescope with the ability to detect faint cosmic signals. Additionally, the focal length was optimized at 1.75 m with conical feed horn of circular aperture radius of 81.7 mm providing a directivity of 6.47 dB and an aperture efficiency of 51% achieving semi-optimal illumination for the designed reflector to minimize the signal loss. The resulting telescope gain of approximately 35 dB supports clear signal capture within the required frequency range. These performance metrics were verified through both simulations and experimental observations, confirming the high performance of our proposed radio telescope design. The advantages of this design include its affordability, replicability, and suitability for educational and research purposes, making it an accessible tool for radio astronomy studies in developing regions. The proposed radio telescope offers a cost-effective solution for institutions seeking to engage in astronomical research and develop hands-on learning experiences in antenna design and signal processing.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-17"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For a spaceborne synthetic aperture radar (SAR) operating on low frequencies (such as P-band), turbulence in the Earth's ionosphere may cause significant phase perturbations of the interrogating signals. These perturbations depend on both the antenna and target coordinates and may lead to substantial image distortions. In our previous work, we proposed a variational approach to correcting the distortions that we called the transionospheric SAR autofocus. It required solving a complex optimization problem but performed well in numerical tests. As the optimization problem may be considered a hurdle, in the current work we compare the performance of the transionospheric SAR autofocus against that of a non-variational approach. The latter combines partial focusing with traditional autofocus where the phase perturbations are assumed to depend only on the antenna coordinates but not the target coordinates. In most cases, the optimization-based SAR autofocus produces images with better articulated peaks (i.e., peaks that are taller and narrower) as compared to those by the alternative approach.
{"title":"Comparative analysis of performance for optimization-based transionospheric SAR autofocus","authors":"Mikhail Gilman;Semyon Tsynkov","doi":"10.1029/2024RS008168","DOIUrl":"https://doi.org/10.1029/2024RS008168","url":null,"abstract":"For a spaceborne synthetic aperture radar (SAR) operating on low frequencies (such as P-band), turbulence in the Earth's ionosphere may cause significant phase perturbations of the interrogating signals. These perturbations depend on both the antenna and target coordinates and may lead to substantial image distortions. In our previous work, we proposed a variational approach to correcting the distortions that we called the transionospheric SAR autofocus. It required solving a complex optimization problem but performed well in numerical tests. As the optimization problem may be considered a hurdle, in the current work we compare the performance of the transionospheric SAR autofocus against that of a non-variational approach. The latter combines partial focusing with traditional autofocus where the phase perturbations are assumed to depend only on the antenna coordinates but not the target coordinates. In most cases, the optimization-based SAR autofocus produces images with better articulated peaks (i.e., peaks that are taller and narrower) as compared to those by the alternative approach.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-19"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Retraction: H. U. Tahseen, L. Mescia, and L. Catarinucci, “A Survey of Five Generations of MIMO Multiband Base Station Antennas,” Radio Science 58, no. 7 (2023): e2023RS007725, https://doi.org/10.1029/2023RS007725. The above article, published online on 18 July 2023 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the journal Editor-in-Chief, Sana Salous; the American Geophysical Union; and Wiley Periodicals LLC. The first author, H. U. Tahseen, asked to retract the article due to a major unattributed overlap between the figures and tables of this article (Figures 3-15, Table 1, 2 and 4) and another article previously published elsewhere by a different group of authors (Farasat et al., 2021). Such publishing practice is against the journal's policy and Wiley's Best Practice Guidelines on Research Integrity and Publishing Ethics. The first author, H. U. Tahseen has confirmed that the co-authors, L. Mescia and L. Catarinucci, were not involved in the practice described above. The authors were informed but did not agree to the retraction wording.
{"title":"Retraction: A survey of five generations of MIMO multiband base station antennas","authors":"","doi":"10.1029/rds.21394","DOIUrl":"https://doi.org/10.1029/rds.21394","url":null,"abstract":"Retraction: H. U. Tahseen, L. Mescia, and L. Catarinucci, “A Survey of Five Generations of MIMO Multiband Base Station Antennas,” Radio Science 58, no. 7 (2023): e2023RS007725, https://doi.org/10.1029/2023RS007725. The above article, published online on 18 July 2023 in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the journal Editor-in-Chief, Sana Salous; the American Geophysical Union; and Wiley Periodicals LLC. The first author, H. U. Tahseen, asked to retract the article due to a major unattributed overlap between the figures and tables of this article (Figures 3-15, Table 1, 2 and 4) and another article previously published elsewhere by a different group of authors (Farasat et al., 2021). Such publishing practice is against the journal's policy and Wiley's Best Practice Guidelines on Research Integrity and Publishing Ethics. The first author, H. U. Tahseen has confirmed that the co-authors, L. Mescia and L. Catarinucci, were not involved in the practice described above. The authors were informed but did not agree to the retraction wording.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-1"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This work presents the characterization of the effective conductivity of additive manufacturing materials used for the fabrication of high-frequency communication devices. Factors such as material type, porosity, roughness, and oxidation reduce this conductivity, leading to increased insertion loss in the manufactured devices. For characterization, an X-band cavity resonator on a rectangular waveguide was designed, and the quality factor was measured for different implementations using various techniques and materials. Conductivity values of up to 17.70 MS/m were obtained for metalized polymeric materials and up to 6.44 MS/m for metallic alloys.
{"title":"Characterization of the effective conductivity in radio frequency of additive manufacturing materials","authors":"Carmen Bachiller;Alvaro Ferrer;Aleksandr Voronov;Murta Capella;Francisco Boscá;M. Luisa Marin;Lluc Sempere;Mirko Kunowsky;Asunción Martínez-García","doi":"10.1029/2024RS008149","DOIUrl":"https://doi.org/10.1029/2024RS008149","url":null,"abstract":"This work presents the characterization of the effective conductivity of additive manufacturing materials used for the fabrication of high-frequency communication devices. Factors such as material type, porosity, roughness, and oxidation reduce this conductivity, leading to increased insertion loss in the manufactured devices. For characterization, an X-band cavity resonator on a rectangular waveguide was designed, and the quality factor was measured for different implementations using various techniques and materials. Conductivity values of up to 17.70 MS/m were obtained for metalized polymeric materials and up to 6.44 MS/m for metallic alloys.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-8"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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