Pub Date : 2020-02-01DOI: 10.1109/AMS48904.2020.9059426
M. Farasat, Yang Yang
Electromagnetic windows, called as Radome, are used to shield the antenna system. Antenna being a part of every microwave system needs more protection, particularly for applications where environmental effects are worse. Radome acts as a supporting structure for critical terrestrial antenna systems, airborne radar systems, and submarine antenna systems. This work discusses the design considerations, and particularly, tilted angles of the radome and their impact on antenna performance. Antenna performance is simulated with radome at different angles. Radome power transmission characteristics are simulated over antenna scan angle range.
{"title":"Investigation of Radome Enclosed Antenna with Tilted Angles of 10° and 20° for Airborne Applications","authors":"M. Farasat, Yang Yang","doi":"10.1109/AMS48904.2020.9059426","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059426","url":null,"abstract":"Electromagnetic windows, called as Radome, are used to shield the antenna system. Antenna being a part of every microwave system needs more protection, particularly for applications where environmental effects are worse. Radome acts as a supporting structure for critical terrestrial antenna systems, airborne radar systems, and submarine antenna systems. This work discusses the design considerations, and particularly, tilted angles of the radome and their impact on antenna performance. Antenna performance is simulated with radome at different angles. Radome power transmission characteristics are simulated over antenna scan angle range.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130353668","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059517
Jakov Mihaljevic, S. Chakraborty, Leigh E. Milner, S. Mahon, M. Heimlich
This paper presents the design and simulation of two single-stage power amplifiers (PAs) to determine the performance capabilities of WIN Semiconductors 0.15 μm Gallium Nitride (GaN)-on-SiC process. Subsequently a 28 GHz two-stage PA is presented for potential integration into 5G transceiver applications. A 2×100 gate-width device was used to develop a driving stage PA (MMIC1) which produced a simulated 12.8 dB small signal gain at the desired 28 GHz. A 4×100 gate-width device was used to characterize an output stage PA (MMIC2) producing 33 dBm power out, PAE of 41%, and a power gain of 11.2 dB. The subsequently designed two-stage PA, MMIC3, combines MMIC1 and MMIC2 and provides a peak small signal gain of 22.5 dB, peak power output of 33 dBm, peak PAE of 31% and peak power gain of 22.4 dB.
{"title":"Design of a 28 GHz Power Amplifier in 0.15 μm GaN Technology","authors":"Jakov Mihaljevic, S. Chakraborty, Leigh E. Milner, S. Mahon, M. Heimlich","doi":"10.1109/AMS48904.2020.9059517","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059517","url":null,"abstract":"This paper presents the design and simulation of two single-stage power amplifiers (PAs) to determine the performance capabilities of WIN Semiconductors 0.15 μm Gallium Nitride (GaN)-on-SiC process. Subsequently a 28 GHz two-stage PA is presented for potential integration into 5G transceiver applications. A 2×100 gate-width device was used to develop a driving stage PA (MMIC1) which produced a simulated 12.8 dB small signal gain at the desired 28 GHz. A 4×100 gate-width device was used to characterize an output stage PA (MMIC2) producing 33 dBm power out, PAE of 41%, and a power gain of 11.2 dB. The subsequently designed two-stage PA, MMIC3, combines MMIC1 and MMIC2 and provides a peak small signal gain of 22.5 dB, peak power output of 33 dBm, peak PAE of 31% and peak power gain of 22.4 dB.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130508137","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059424
J. Marimuthu, G. Gardner
In this studies a prototype low cost portable handheld microwave system (MiS) designed and tested for back fat depth measurements using non-invasive techniques on lamb carcase in commercial abattoirs. For this application, two different type antennas was designed and tested. These results demonstrate the capacity of this prototype MiS system together with proposed antennas to estimate fat depth at the C site in lamb carcasses non-invasively in commercial abattoir at rate 100 carcase in 30 minutes.
{"title":"Using Microwave Non-Invasive Techniques to Measure Fat Depth on Lamb Carcase in Commercial Abattoirs","authors":"J. Marimuthu, G. Gardner","doi":"10.1109/AMS48904.2020.9059424","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059424","url":null,"abstract":"In this studies a prototype low cost portable handheld microwave system (MiS) designed and tested for back fat depth measurements using non-invasive techniques on lamb carcase in commercial abattoirs. For this application, two different type antennas was designed and tested. These results demonstrate the capacity of this prototype MiS system together with proposed antennas to estimate fat depth at the C site in lamb carcasses non-invasively in commercial abattoir at rate 100 carcase in 30 minutes.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"16 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131180898","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059522
N. Nguyen-Trong, S. Ta
Two design strategies to construct wideband tripolarized antennas are summarized and presented in this paper. First is a design method for a low-profile structure, which can achieve up to 24% fractional bandwidth with a profile of only 0:09λmin, (λmin is the free-space wavelength at the minimum operating frequency). When the antenna height can be compromised, i.e. increasing to about 0:17λmin, we will demonstrate how a substantially large fractional bandwidth of 80% can be achieved in an integrated structure.
{"title":"Design Strategies for Tripolarized Antennas with Wideband Characteristic","authors":"N. Nguyen-Trong, S. Ta","doi":"10.1109/AMS48904.2020.9059522","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059522","url":null,"abstract":"Two design strategies to construct wideband tripolarized antennas are summarized and presented in this paper. First is a design method for a low-profile structure, which can achieve up to 24% fractional bandwidth with a profile of only 0:09λmin, (λmin is the free-space wavelength at the minimum operating frequency). When the antenna height can be compromised, i.e. increasing to about 0:17λmin, we will demonstrate how a substantially large fractional bandwidth of 80% can be achieved in an integrated structure.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130869820","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059362
M. Shahpari, C. Fumeaux, D. Thiel
A new method to measure the surface conductivity $sigma_{s}$ of thin conductors has been recently proposed, that requires placement of a narrow strip inside a rectangular waveguide. Infinite series appear in the calculations required to extract $sigma_{s}$ from the measured scattering parameters. In this paper, we explore the convergence of the different series that are associated with two choices of basis functions (uniform & cosh). We also show the impact of the series truncation on the final computed values of the complex surface conductivity of 10-$j$ 10mS=Sq at 10GHz.
{"title":"Convergence Properties of Surface Conductivity Characterization Method for Thin Conductive Strips","authors":"M. Shahpari, C. Fumeaux, D. Thiel","doi":"10.1109/AMS48904.2020.9059362","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059362","url":null,"abstract":"A new method to measure the surface conductivity $sigma_{s}$ of thin conductors has been recently proposed, that requires placement of a narrow strip inside a rectangular waveguide. Infinite series appear in the calculations required to extract $sigma_{s}$ from the measured scattering parameters. In this paper, we explore the convergence of the different series that are associated with two choices of basis functions (uniform & cosh). We also show the impact of the series truncation on the final computed values of the complex surface conductivity of 10-$j$ 10mS=Sq at 10GHz.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125781884","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059480
Tianyu Yang, C. Ding, R. Ziolkowski, Y. Guo
A method to achieve a photonic crystal fiber (PCF) with high birefringence for polarization maintenance in short range THz communication systems is introduced in this paper. Rectangular air slots are etched in the core region of the fiber; they make the X-polarized (XP) and Y-polarized (YP) propagation modes have different propagation constants, thus leading to the higher birefringence. In contrast to the widely-used fully-slotted (FS) configuration in which the fiber core is almost fully occupied by air slots, the proposed PCF has a partially-slotted (PS) core. The air slot in the core center is absent; only the dielectric background is present. Comparisons are made between the fully-slotted and partially-slotted PCFs to illustrate that the PS PCF overperforms the FS PCF. After optimization, the PS PCF attains a high birefringence value of 0.069 and a total loss of 0.071 cm-1 at 1.0 THz. Over a broad 0.4 THz working band, from 0.53 to 0.93 THz, the dispersion is within 0.06 ps/THz/cm.
{"title":"Achieving a Terahertz Photonic Crystal Fiber with Enhanced Birefrigence","authors":"Tianyu Yang, C. Ding, R. Ziolkowski, Y. Guo","doi":"10.1109/AMS48904.2020.9059480","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059480","url":null,"abstract":"A method to achieve a photonic crystal fiber (PCF) with high birefringence for polarization maintenance in short range THz communication systems is introduced in this paper. Rectangular air slots are etched in the core region of the fiber; they make the X-polarized (XP) and Y-polarized (YP) propagation modes have different propagation constants, thus leading to the higher birefringence. In contrast to the widely-used fully-slotted (FS) configuration in which the fiber core is almost fully occupied by air slots, the proposed PCF has a partially-slotted (PS) core. The air slot in the core center is absent; only the dielectric background is present. Comparisons are made between the fully-slotted and partially-slotted PCFs to illustrate that the PS PCF overperforms the FS PCF. After optimization, the PS PCF attains a high birefringence value of 0.069 and a total loss of 0.071 cm-1 at 1.0 THz. Over a broad 0.4 THz working band, from 0.53 to 0.93 THz, the dispersion is within 0.06 ps/THz/cm.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121700590","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059455
Kim Tuyen Trinh, Chia-Han Lin, H. Kao, H. Chiu, N. Karmakar
A two-gain-level GaAs pHEMT amplifier adopting Cascode and common source topologies, operating at 37 GHz for radiometer active phase shifters was designed. The EM simulated results show that the developed amplifier achieves a maximum gain of 19.4 dB and gain difference of 7.6 dB. The typical noise figures of 6 dB and 7.2 dB in high and low gain states respectively within 1 GHz bandwidth. DC power consumption is about 217 mW. Within the bandwidth of interest, the gain flatness is about ± 0.5 dB; the input and output return losses are larger 9 dB at 37 GHz for both gain stages. Gain levels are obtained by changing the gate voltage in the Cascode stage. The MMIC chip is fabricated by using 0.15 μm GaAs pHEMT Process. The total core area of the chip with all the pads is 1.5 mm × 1 mm.
{"title":"Design of Two-Gain-Level Amplifier for $Ka$-Band Phase Shifters Using 0.15 μm GaAs pHEMT Process","authors":"Kim Tuyen Trinh, Chia-Han Lin, H. Kao, H. Chiu, N. Karmakar","doi":"10.1109/AMS48904.2020.9059455","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059455","url":null,"abstract":"A two-gain-level GaAs pHEMT amplifier adopting Cascode and common source topologies, operating at 37 GHz for radiometer active phase shifters was designed. The EM simulated results show that the developed amplifier achieves a maximum gain of 19.4 dB and gain difference of 7.6 dB. The typical noise figures of 6 dB and 7.2 dB in high and low gain states respectively within 1 GHz bandwidth. DC power consumption is about 217 mW. Within the bandwidth of interest, the gain flatness is about ± 0.5 dB; the input and output return losses are larger 9 dB at 37 GHz for both gain stages. Gain levels are obtained by changing the gate voltage in the Cascode stage. The MMIC chip is fabricated by using 0.15 μm GaAs pHEMT Process. The total core area of the chip with all the pads is 1.5 mm × 1 mm.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115595372","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059545
M. Rudd, T. Baum, K. Ghorbani
This paper discusses different approaches to modeling Carbon Fiber Reinforced Polymers (CFRP). Modeling CFRP at fiber level has been studied, and the feasibility of homogeneous volume and thin layer approximation has been investigated. Finally, the simulation result for a WR90 waveguide with the proposed approximation is presented along with measurements.
{"title":"Different Levels of Approximation in High-Frequecy Modeling of Carbon Fiber Reinforced Polymers","authors":"M. Rudd, T. Baum, K. Ghorbani","doi":"10.1109/AMS48904.2020.9059545","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059545","url":null,"abstract":"This paper discusses different approaches to modeling Carbon Fiber Reinforced Polymers (CFRP). Modeling CFRP at fiber level has been studied, and the feasibility of homogeneous volume and thin layer approximation has been investigated. Finally, the simulation result for a WR90 waveguide with the proposed approximation is presented along with measurements.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125345801","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059481
N. Y. Koli, M. Afzal, K. Esselle, R. Hashmi, Md. Zahidul Islam, S. Shrestha
In this paper, we have designed and investigated a double layer circularly polarised radial line slot array (RLSA) antenna for satellite communication. The antenna is composed of twofold radial waveguide with slots acting as radiating elements on its surface. The radiating slots are arranged in a spiral pattern on the antenna aperture. Every slot has a particular length and position. The slots are oriented in a way to intercept the radial currents on the upper waveguide. The slot lengths were varied to achieve a uniform aperture distribution. The electromagnetic power is fed from center of the lower waveguide. Numerical results show that the antenna is well matched within the operating frequency range. The far-field results indicate a peak directivity of 27 dBi at 20 GHz with a good pattern quality and lower side lobe level of −27.2 dB.
{"title":"A Double Layer Circularly Polarised Radial Line Slot Array Antenna with Uniform Aperture Illumination","authors":"N. Y. Koli, M. Afzal, K. Esselle, R. Hashmi, Md. Zahidul Islam, S. Shrestha","doi":"10.1109/AMS48904.2020.9059481","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059481","url":null,"abstract":"In this paper, we have designed and investigated a double layer circularly polarised radial line slot array (RLSA) antenna for satellite communication. The antenna is composed of twofold radial waveguide with slots acting as radiating elements on its surface. The radiating slots are arranged in a spiral pattern on the antenna aperture. Every slot has a particular length and position. The slots are oriented in a way to intercept the radial currents on the upper waveguide. The slot lengths were varied to achieve a uniform aperture distribution. The electromagnetic power is fed from center of the lower waveguide. Numerical results show that the antenna is well matched within the operating frequency range. The far-field results indicate a peak directivity of 27 dBi at 20 GHz with a good pattern quality and lower side lobe level of −27.2 dB.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123686483","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 : 2020-02-01DOI: 10.1109/AMS48904.2020.9059548
C. Granet, J. Kot
A receive-only simultaneous X/Ka feed system for offset parabolic reflectors with F/D ratios of 0.8 has been designed. This includes electromagnetic and full mechanical design.
设计了一种F/D比为0.8的偏置抛物面反射器同步X/Ka馈电系统。这包括电磁和全机械设计。
{"title":"Design of a Receive-Only Simultaneous X/Ka Feed System for F/D=0.8 Offset Parabolic Reflectors","authors":"C. Granet, J. Kot","doi":"10.1109/AMS48904.2020.9059548","DOIUrl":"https://doi.org/10.1109/AMS48904.2020.9059548","url":null,"abstract":"A receive-only simultaneous X/Ka feed system for offset parabolic reflectors with F/D ratios of 0.8 has been designed. This includes electromagnetic and full mechanical design.","PeriodicalId":257699,"journal":{"name":"2020 4th Australian Microwave Symposium (AMS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114872145","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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