Pub Date : 2022-06-05DOI: 10.1109/WAMS54719.2022.9847755
Raghavendra K, S. V, Kranti Kumar R, Madhukar H
RF seeker is used in terminal guidance of interceptor missiles. Seeker test data in HWILS (Hardware in loop simulation) runs and flight test data has shown a misalignment between (a) RF seeker mechanical axis and electrical axis (b) Between IMU and RF seeker. These misalignments if not compensated will result in higher miss distances during end game. Hence they are required to be measured & compensated to achieve ‘hit to kill’ situation. This paper describes the procedures adapted to measure misalignments using laser tracker and validation of guidance algorithm after compensation of misalignments in HWILS facility.
{"title":"Characterization of RF Seeker for Misalignments","authors":"Raghavendra K, S. V, Kranti Kumar R, Madhukar H","doi":"10.1109/WAMS54719.2022.9847755","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9847755","url":null,"abstract":"RF seeker is used in terminal guidance of interceptor missiles. Seeker test data in HWILS (Hardware in loop simulation) runs and flight test data has shown a misalignment between (a) RF seeker mechanical axis and electrical axis (b) Between IMU and RF seeker. These misalignments if not compensated will result in higher miss distances during end game. Hence they are required to be measured & compensated to achieve ‘hit to kill’ situation. This paper describes the procedures adapted to measure misalignments using laser tracker and validation of guidance algorithm after compensation of misalignments in HWILS facility.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123487249","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9847876
M. A., Ashish K Adiga, Abhishek K Manjunath, Yashwanth Giddegowda, Rohini G. Bhatkoorse
In this work, a comparative study between multilayered shells and multilayered metamaterial lens for gain enhancement of a $4times 4$ array is carried out. A $4times 4$ rectangular patch antenna array operating at 24GHz is designed. The patch has perturbations at the corners to achieve circular polarization (CP). The array has been designed on RT Duroid 5880 substrate of thickness 0.508mm. The antenna array is edge fed with unequally truncated corners on both diagonals. Initial design is analytically calculated using predefined equations, followed by several iterations to further refine i t. The $4times 4$ a rray a chieved a gain of 17.3dB and an axial ratio of 0.55dB. The ARB (Axial Ratio Bandwidth) for the same design is 2.54% and IB(Impedance Bandwidth) is 6.532%. The narrower ARB is a compromise for obtaining the higher gain. Further to enhance the gain of $4times 4$ array antenna, two case studies are considered. In the first case, four layered dielectric hemispherical shells is used and in the second case, a 4 layered metamaterial Lens is employed. A gain enhancement of 5.1dB and 4dB is observed in 4-layered dielectric shells and 4-layered metamaterial lens respectively. All the above results have been obtained by simulating with EM flow solver Ansys HFSS. As the dielectric shells developed has a wide band behaviour compared to the metamaterial lenses, the developed design can be extensively used for MIMO antennas for millimeter wave applications and 5G applications in FR2 band for gain enhancement.
{"title":"Gain Enhancement of $4times 4$ mm-Wave Patch Array with Dielectric Shells and Metamaterial Lens: A Comparative Study","authors":"M. A., Ashish K Adiga, Abhishek K Manjunath, Yashwanth Giddegowda, Rohini G. Bhatkoorse","doi":"10.1109/WAMS54719.2022.9847876","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9847876","url":null,"abstract":"In this work, a comparative study between multilayered shells and multilayered metamaterial lens for gain enhancement of a $4times 4$ array is carried out. A $4times 4$ rectangular patch antenna array operating at 24GHz is designed. The patch has perturbations at the corners to achieve circular polarization (CP). The array has been designed on RT Duroid 5880 substrate of thickness 0.508mm. The antenna array is edge fed with unequally truncated corners on both diagonals. Initial design is analytically calculated using predefined equations, followed by several iterations to further refine i t. The $4times 4$ a rray a chieved a gain of 17.3dB and an axial ratio of 0.55dB. The ARB (Axial Ratio Bandwidth) for the same design is 2.54% and IB(Impedance Bandwidth) is 6.532%. The narrower ARB is a compromise for obtaining the higher gain. Further to enhance the gain of $4times 4$ array antenna, two case studies are considered. In the first case, four layered dielectric hemispherical shells is used and in the second case, a 4 layered metamaterial Lens is employed. A gain enhancement of 5.1dB and 4dB is observed in 4-layered dielectric shells and 4-layered metamaterial lens respectively. All the above results have been obtained by simulating with EM flow solver Ansys HFSS. As the dielectric shells developed has a wide band behaviour compared to the metamaterial lenses, the developed design can be extensively used for MIMO antennas for millimeter wave applications and 5G applications in FR2 band for gain enhancement.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124476525","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9847870
Shushrutha K S, M. A., Ashish K Adiga
The flat lens antennas are compact and are easily integrated with the primary radiator. Its applications are in the domain of microwave, optics, and propagation applications. These antennas have flat boundaries and equal phases for any outgoing radiation beam. To analyze a flat lens antenna a simple hybrid method to compute fields is proposed and a systematic procedure to compute these fields is presented in this paper. To validate this hybrid method, a $1times 2$ rectangular patch array antenna along with a 5 layered flat lens is designed and simulated using EM Flow Solver Ansys HFSS. The $1times 2$ array and 5 layered lenses are fabricated and radiation characteristics are measured. The gain obtained for the 1×2 array is 10.2dB. When the 5 layered flat lens is excited with a 1×2 array, the gain of 15.2dB is observed. The flat lens antenna provides a gain improvement of 5dB. The proposed hybrid method results match closely with the simulation and measurement.
{"title":"Hybrid Method to Compute EM-Fields of Multi Gradient Flat Lens-Array Antenna","authors":"Shushrutha K S, M. A., Ashish K Adiga","doi":"10.1109/WAMS54719.2022.9847870","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9847870","url":null,"abstract":"The flat lens antennas are compact and are easily integrated with the primary radiator. Its applications are in the domain of microwave, optics, and propagation applications. These antennas have flat boundaries and equal phases for any outgoing radiation beam. To analyze a flat lens antenna a simple hybrid method to compute fields is proposed and a systematic procedure to compute these fields is presented in this paper. To validate this hybrid method, a $1times 2$ rectangular patch array antenna along with a 5 layered flat lens is designed and simulated using EM Flow Solver Ansys HFSS. The $1times 2$ array and 5 layered lenses are fabricated and radiation characteristics are measured. The gain obtained for the 1×2 array is 10.2dB. When the 5 layered flat lens is excited with a 1×2 array, the gain of 15.2dB is observed. The flat lens antenna provides a gain improvement of 5dB. The proposed hybrid method results match closely with the simulation and measurement.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124488705","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9848024
P. Raiguru, M. Sahani, S. K. Rout, D. C. Panda, R. Mishra
Sparse array has attracted a lot of attentions because of its higher DOF $O(N^{2})$ with only few physical elements ($N$). It has this property by imposing the difference co-array, which is defined as the difference between elements locations. However, empirically, the co-array of sparse arrays structure is vulnerable to impaired elements and reliability of sparse arrays is an open topic for investigation. In this context the present work examines fractal based sub-array DOA estimator. Broadly speaking, robustness is analyzed by exploiting element essentiality, fragility and normalized DCA size. Furthermore, the paper compares the robustness and size of difference co-array configurations of fractal based sub array with different existing sparse arrays. From the numerical examples, it is investigated that for the fixed $N$ elements, increase of difference co-array size typically cause in less robustness to element failure.
{"title":"Impaired Fractal Based Sub-Array Diagnosis","authors":"P. Raiguru, M. Sahani, S. K. Rout, D. C. Panda, R. Mishra","doi":"10.1109/WAMS54719.2022.9848024","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9848024","url":null,"abstract":"Sparse array has attracted a lot of attentions because of its higher DOF $O(N^{2})$ with only few physical elements ($N$). It has this property by imposing the difference co-array, which is defined as the difference between elements locations. However, empirically, the co-array of sparse arrays structure is vulnerable to impaired elements and reliability of sparse arrays is an open topic for investigation. In this context the present work examines fractal based sub-array DOA estimator. Broadly speaking, robustness is analyzed by exploiting element essentiality, fragility and normalized DCA size. Furthermore, the paper compares the robustness and size of difference co-array configurations of fractal based sub array with different existing sparse arrays. From the numerical examples, it is investigated that for the fixed $N$ elements, increase of difference co-array size typically cause in less robustness to element failure.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128560213","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9848333
Krishna Mazumder, Anumoy Ghosh
A small-scale circular polarized (CP) wide beam reader antenna is being presented in this article. Single feed, rectangular-slotted patch antenna is designed with a size of $0.24lambda_{0}times 0.24lambda_{0}$ at UHF (840–960) MHz for RFID applications. Free-space wavelength corresponding to the resonant frequency is $lambda_{0}$. Wide rectangular slotted patch on the front side and inverted L shaped feed line on the back side have been implanted to help this antenna for size reduction. The circular polarize radiation is been carry through in two steps, one is by switching the feedline and another is by placing an antithetical L-parasite strip into the rectangular slot. This two L-parasite strips on the both side have been connected through metal via. Therefore, the combined effect of horizontal and vertical polarization assures to sustain wide beamwidth. The antenna results carry out of 70MHz, 10 dB impedance bandwidth and 29MHz, 3dB axial ratio bandwidth (ARBW) within the operating band. Half-power beamwidth in X-Z radiation plane is achieved to reach 110°. With maintaining the 3.32dB overall gain, this antenna established itself as a competent CP antenna for RFID application.
{"title":"A Small Scale Circular Polarized Reader Antenna with Wide Beamwidth for RFID Applications","authors":"Krishna Mazumder, Anumoy Ghosh","doi":"10.1109/WAMS54719.2022.9848333","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9848333","url":null,"abstract":"A small-scale circular polarized (CP) wide beam reader antenna is being presented in this article. Single feed, rectangular-slotted patch antenna is designed with a size of $0.24lambda_{0}times 0.24lambda_{0}$ at UHF (840–960) MHz for RFID applications. Free-space wavelength corresponding to the resonant frequency is $lambda_{0}$. Wide rectangular slotted patch on the front side and inverted L shaped feed line on the back side have been implanted to help this antenna for size reduction. The circular polarize radiation is been carry through in two steps, one is by switching the feedline and another is by placing an antithetical L-parasite strip into the rectangular slot. This two L-parasite strips on the both side have been connected through metal via. Therefore, the combined effect of horizontal and vertical polarization assures to sustain wide beamwidth. The antenna results carry out of 70MHz, 10 dB impedance bandwidth and 29MHz, 3dB axial ratio bandwidth (ARBW) within the operating band. Half-power beamwidth in X-Z radiation plane is achieved to reach 110°. With maintaining the 3.32dB overall gain, this antenna established itself as a competent CP antenna for RFID application.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129595120","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9847707
N. K. Sahu, S. Mishra
This paper presents a novel approach for achieving circular-polarization (CP) in the 2.4 GHz ISM-band for OFF-body communication. The behaviour is modelled by the incident of $x$-and $y$-polarized waves generated from a 45°-tilted monopole structure to an anisotropic metasurface. The reflected waves from the metasurface are then combined with the direct wave in the far-field, resulting in an equalization of the orthogonal component's amplitude with a 90° phase difference. The monopole structure is designed first at 2.45 GHz, and then the metasurface is designed according to the axial ratio (AR) characteristics. The metasurface is made up of $3times 3$ ring-type unit cells. The proposed metasurface not only generates CP but also aids in the reduction of backward radiation and provides miniaturization compared to the conventional rectangular unit-cell. The design is accomplished using CST Microwave Studio. The proposed metasurface-based antenna produced an impedance bandwidth of 330 MHz, an AR bandwidth of 74 MHz, a peak gain of 6.6 dBi, and a radiation efficiency of 69 % in free space (FS). On the body, its performance remains the same as in free space and provides a SAR value of 0.09 and 0.04 W/Kg under the 1 g and 10 g standards, respectively.
{"title":"Anisotropic Metasurface Inspired Circularly-polarized Monopole Antenna for OFF Body Communications","authors":"N. K. Sahu, S. Mishra","doi":"10.1109/WAMS54719.2022.9847707","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9847707","url":null,"abstract":"This paper presents a novel approach for achieving circular-polarization (CP) in the 2.4 GHz ISM-band for OFF-body communication. The behaviour is modelled by the incident of $x$-and $y$-polarized waves generated from a 45°-tilted monopole structure to an anisotropic metasurface. The reflected waves from the metasurface are then combined with the direct wave in the far-field, resulting in an equalization of the orthogonal component's amplitude with a 90° phase difference. The monopole structure is designed first at 2.45 GHz, and then the metasurface is designed according to the axial ratio (AR) characteristics. The metasurface is made up of $3times 3$ ring-type unit cells. The proposed metasurface not only generates CP but also aids in the reduction of backward radiation and provides miniaturization compared to the conventional rectangular unit-cell. The design is accomplished using CST Microwave Studio. The proposed metasurface-based antenna produced an impedance bandwidth of 330 MHz, an AR bandwidth of 74 MHz, a peak gain of 6.6 dBi, and a radiation efficiency of 69 % in free space (FS). On the body, its performance remains the same as in free space and provides a SAR value of 0.09 and 0.04 W/Kg under the 1 g and 10 g standards, respectively.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132449955","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9847979
A. N. Madhuri, A. Bharathi, M. Swetha
A miniaturized 90° hybrid coupler for X band using distributed capacitors in the inner area is designed. It is composed of high impedance transmission lines with reduced length and distributed capacitors. It is designed to increase the operating bandwidth and reduce the size as small as possible. To further increase the bandwidth a two section hybrid coupler is implemented. The miniaturized hybrid has amplitude imbalance of ± 0.5 dB, return loss and isolation of 15dB in the frequency range of 9.48GHz to 9.87GHz. The miniaturized broadband hybrid coupler has amplitude imbalance of ± 0.5 dB, return loss and isolation of 15dB in the frequency range of 9.46GHz to 12GHz. Both the design has broader bandwidth and minimum phase imbalance. The designs were simulated using Ansys HFSS.
{"title":"X Band Miniaturized 90° Hybrid Coupler","authors":"A. N. Madhuri, A. Bharathi, M. Swetha","doi":"10.1109/WAMS54719.2022.9847979","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9847979","url":null,"abstract":"A miniaturized 90° hybrid coupler for X band using distributed capacitors in the inner area is designed. It is composed of high impedance transmission lines with reduced length and distributed capacitors. It is designed to increase the operating bandwidth and reduce the size as small as possible. To further increase the bandwidth a two section hybrid coupler is implemented. The miniaturized hybrid has amplitude imbalance of ± 0.5 dB, return loss and isolation of 15dB in the frequency range of 9.48GHz to 9.87GHz. The miniaturized broadband hybrid coupler has amplitude imbalance of ± 0.5 dB, return loss and isolation of 15dB in the frequency range of 9.46GHz to 12GHz. Both the design has broader bandwidth and minimum phase imbalance. The designs were simulated using Ansys HFSS.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132179468","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9848123
R. Sivasamy, Abdulla Khan L, Nahul S, N. K, Mohd Shahrukh
A thin broadband dual-layer absorber based on periodic Frequency Selective Surfaces (FSS) is proposed in this paper. The proposed absorber functions in the frequency range of 4.8 to 10.2 GHz at a reflection level of −10 dB. The operational characteristics of absorber using FSS is observed for TE and TM polarization and also its frequency response is observed for different angles of incidence. A prototype of the FSS based absorber is fabricated and the results are validated using measurements.
{"title":"Design and Fabrication of a Miniaturized Microwave Absorber With Wide Band Absorption Characteristics","authors":"R. Sivasamy, Abdulla Khan L, Nahul S, N. K, Mohd Shahrukh","doi":"10.1109/WAMS54719.2022.9848123","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9848123","url":null,"abstract":"A thin broadband dual-layer absorber based on periodic Frequency Selective Surfaces (FSS) is proposed in this paper. The proposed absorber functions in the frequency range of 4.8 to 10.2 GHz at a reflection level of −10 dB. The operational characteristics of absorber using FSS is observed for TE and TM polarization and also its frequency response is observed for different angles of incidence. A prototype of the FSS based absorber is fabricated and the results are validated using measurements.","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127845557","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9847798
Praneeth P Jain, Saptarshi Ghosh
A reconfigurable multiple input multiple output (MIMO) antenna has been presented in this paper for sub-6 GHz applications. The antenna geometry is developed on a single dielectric substrate with a defected ground plane and a p-i-n diode is used in the top metallic layer to switch between ultra-wideband (UWB) and narrow-band (NB) states of operation. During UWB mode, the proposed MIMO antenna exhibits an operating bandwidth from 2.4 GHz to 6.0 GHz, and it resonates between 5.8 GHz to 6.3 GHz during the NB state. Furthermore, minimum isolation of 20 dB, an envelope correlation coefficient value of less than 0.5, and a channel capacity loss of less than 0.5 is attained by the antenna, displaying satisfactory MIMO characteristics. Low profile, compact size, and easy switching technique offer the proposed antenna as a good choice for wireless communication under sub-6 GHz spectrum in various WLAN, WiFi devices, and internet service providers (ISP's).
{"title":"A Reconfigurable Four-Port MIMO Antenna for Sub-6 GHz Applications","authors":"Praneeth P Jain, Saptarshi Ghosh","doi":"10.1109/WAMS54719.2022.9847798","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9847798","url":null,"abstract":"A reconfigurable multiple input multiple output (MIMO) antenna has been presented in this paper for sub-6 GHz applications. The antenna geometry is developed on a single dielectric substrate with a defected ground plane and a p-i-n diode is used in the top metallic layer to switch between ultra-wideband (UWB) and narrow-band (NB) states of operation. During UWB mode, the proposed MIMO antenna exhibits an operating bandwidth from 2.4 GHz to 6.0 GHz, and it resonates between 5.8 GHz to 6.3 GHz during the NB state. Furthermore, minimum isolation of 20 dB, an envelope correlation coefficient value of less than 0.5, and a channel capacity loss of less than 0.5 is attained by the antenna, displaying satisfactory MIMO characteristics. Low profile, compact size, and easy switching technique offer the proposed antenna as a good choice for wireless communication under sub-6 GHz spectrum in various WLAN, WiFi devices, and internet service providers (ISP's).","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126482861","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 : 2022-06-05DOI: 10.1109/WAMS54719.2022.9848102
Soumik Dey, Kailas S Vel, Sukomal Dey
This paper presents two new reflection type linear cross converters at the terahertz (THz) waveband. The proposed converter possesses the advantages of compact and simple unit cell geometry, which can be optimized easily for single wideband and dual broadband polarization conversion. The unit cell of the converter comprises anisotropic geometry of double E-shaped resonators. The designed structure converts a linear polarized incident wave into cross-polarization over the frequency range of 0.67 to 1.65 THz (84.5 %) with above 90 % polarization conversion ratio (PCR). At three frequencies of 0.73, 1.11, and 1.55 THz near 100 % polarization conversion is achieved. The converter exhibits stable polarization conversion characteristics for incidence angle > 35°. A pair of parallel slits are placed along the length of the E-shaped resonators to obtain a notch in the converter's response. The modified metasurface exhibits dual-band cross-polarization conversion between the frequency ranges of 0.67-1.06 THz (45.1 %) and 1.37-1.74 THz (23.8 %).
{"title":"Compact Single and Dual Broadband Reflective Type Linear Cross Converters at Terahertz Regime","authors":"Soumik Dey, Kailas S Vel, Sukomal Dey","doi":"10.1109/WAMS54719.2022.9848102","DOIUrl":"https://doi.org/10.1109/WAMS54719.2022.9848102","url":null,"abstract":"This paper presents two new reflection type linear cross converters at the terahertz (THz) waveband. The proposed converter possesses the advantages of compact and simple unit cell geometry, which can be optimized easily for single wideband and dual broadband polarization conversion. The unit cell of the converter comprises anisotropic geometry of double E-shaped resonators. The designed structure converts a linear polarized incident wave into cross-polarization over the frequency range of 0.67 to 1.65 THz (84.5 %) with above 90 % polarization conversion ratio (PCR). At three frequencies of 0.73, 1.11, and 1.55 THz near 100 % polarization conversion is achieved. The converter exhibits stable polarization conversion characteristics for incidence angle > 35°. A pair of parallel slits are placed along the length of the E-shaped resonators to obtain a notch in the converter's response. The modified metasurface exhibits dual-band cross-polarization conversion between the frequency ranges of 0.67-1.06 THz (45.1 %) and 1.37-1.74 THz (23.8 %).","PeriodicalId":410781,"journal":{"name":"2022 IEEE Wireless Antenna and Microwave Symposium (WAMS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122185236","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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