Pub Date : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293396
T. Kríz
The article outlines the outcomes of the numerical modelling of planar resonator structures designed for GHz frequencies. In order to achieve a response in the GHz region of the electromagnetic field, we employ three types of dot-like structures, namely, squares, circles, and dipoles, to form the desired arrays. The results provided by these structures are subjected to comparison.
{"title":"Comparing planar periodic resonant structures at GHz frequencies","authors":"T. Kríz","doi":"10.1109/PIERS-FALL.2017.8293396","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293396","url":null,"abstract":"The article outlines the outcomes of the numerical modelling of planar resonator structures designed for GHz frequencies. In order to achieve a response in the GHz region of the electromagnetic field, we employ three types of dot-like structures, namely, squares, circles, and dipoles, to form the desired arrays. The results provided by these structures are subjected to comparison.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"80 1","pages":"1635-1639"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75533823","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293436
R. L. Timsina, R. Messner, Jean L. Kubwimana
This paper presents a 1×4 microstrip Phased Array Antenna (PAA) with a uniquely designed switch line phase shifter to obtain steerable beam pattern. The antenna is designed on a Rogers RT/Duroid 6006TM dielectric substrate with a relative permittivity of 6.15. Each element of the probe fed PAA are connected to a phase shifter on a different dielectric substrate. The phase shifter has four equal length microstrip lines placed on a circular fashion around a via that connects the antenna. The circular phase shifter network feeds the antenna through the via at the center. This design is useful if a phase shifter must be integrated with an antenna in a tight space. A diode switch is placed between the microstrip traces to change the length of the transmission line. An addition of each transmission line provides a phase shift of 90°. The Arduino controlled switches can be turned ON and OFF to steer the antenna beam pattern. The maximum steering angle obtained was ±45°. The antenna is appropriate for Wi-Fi application that requires directional beam pattern, Multiple Input Multiple Output (MIMO) communications, scanning radar, and other applications requiring steerable beam pattern.
{"title":"A compact design of switched line phase shifter for a microstrip phased array antenna","authors":"R. L. Timsina, R. Messner, Jean L. Kubwimana","doi":"10.1109/PIERS-FALL.2017.8293436","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293436","url":null,"abstract":"This paper presents a 1×4 microstrip Phased Array Antenna (PAA) with a uniquely designed switch line phase shifter to obtain steerable beam pattern. The antenna is designed on a Rogers RT/Duroid 6006TM dielectric substrate with a relative permittivity of 6.15. Each element of the probe fed PAA are connected to a phase shifter on a different dielectric substrate. The phase shifter has four equal length microstrip lines placed on a circular fashion around a via that connects the antenna. The circular phase shifter network feeds the antenna through the via at the center. This design is useful if a phase shifter must be integrated with an antenna in a tight space. A diode switch is placed between the microstrip traces to change the length of the transmission line. An addition of each transmission line provides a phase shift of 90°. The Arduino controlled switches can be turned ON and OFF to steer the antenna beam pattern. The maximum steering angle obtained was ±45°. The antenna is appropriate for Wi-Fi application that requires directional beam pattern, Multiple Input Multiple Output (MIMO) communications, scanning radar, and other applications requiring steerable beam pattern.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"71 1","pages":"1839-1844"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75888172","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293563
D. Klionskiy, D. Kaplun, V. V. Gulvanskiy, D. Bogaevskiy, S. Romanov, S. V. Kalincev
The paper is devoted to the application of specific functions called harmonic wavelets, which are aimed at processing a wide range of oscillating hydroacoustic signals including multiharmonic and transient signals. We provide basics of the harmonic wavelet transform and a two-stage algorithm for computing wavelet coefficients based on the discrete Fourier transform. We introduce a special efficiency factor of applying these wavelets to oscillating hydroacoustic signals. Application of harmonic wavelets is efficient for processing oscillating hydroacoustic signals since harmonic wavelets have similarities with these types of signals. In many cases the best basis is the basis that has high correlation with the investigated signals since signal representation in such a basis will require a small number of components. We devote special attention to a very important practical task — denoising of oscillating signals using special statistical criteria and wavelet-based thresholding.
{"title":"Application of harmonic wavelets to processing oscillating hydroacoustic signals","authors":"D. Klionskiy, D. Kaplun, V. V. Gulvanskiy, D. Bogaevskiy, S. Romanov, S. V. Kalincev","doi":"10.1109/PIERS-FALL.2017.8293563","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293563","url":null,"abstract":"The paper is devoted to the application of specific functions called harmonic wavelets, which are aimed at processing a wide range of oscillating hydroacoustic signals including multiharmonic and transient signals. We provide basics of the harmonic wavelet transform and a two-stage algorithm for computing wavelet coefficients based on the discrete Fourier transform. We introduce a special efficiency factor of applying these wavelets to oscillating hydroacoustic signals. Application of harmonic wavelets is efficient for processing oscillating hydroacoustic signals since harmonic wavelets have similarities with these types of signals. In many cases the best basis is the basis that has high correlation with the investigated signals since signal representation in such a basis will require a small number of components. We devote special attention to a very important practical task — denoising of oscillating signals using special statistical criteria and wavelet-based thresholding.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"70 1","pages":"2528-2533"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75950115","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293582
Jiang-Yu Liu, Tie-jun Huang, Pu‐Kun Liu
The tunable plasmon-induced transparency (PIT) metamaterial structures composed of periodically patterned graphene microholes and microribbons are presented and numerically investigated. The interaction between plasmonic modes that lead to the PIT effect is studied in detail by analyzing the field distributions. A coupled Lorentz oscillator model is used to explain the mechanism of the PIT effect. The transparency window of PIT structures can be dynamically tuned by varying the Fermi level of the graphene. The tunable graphene PIT device may have potential applications in designing optical switching devices, ultra-compact sensors and slow light devices in the THz region.
{"title":"Tunable plasmon-induced transparentcy in bilayer graphene metamaterials","authors":"Jiang-Yu Liu, Tie-jun Huang, Pu‐Kun Liu","doi":"10.1109/PIERS-FALL.2017.8293582","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293582","url":null,"abstract":"The tunable plasmon-induced transparency (PIT) metamaterial structures composed of periodically patterned graphene microholes and microribbons are presented and numerically investigated. The interaction between plasmonic modes that lead to the PIT effect is studied in detail by analyzing the field distributions. A coupled Lorentz oscillator model is used to explain the mechanism of the PIT effect. The transparency window of PIT structures can be dynamically tuned by varying the Fermi level of the graphene. The tunable graphene PIT device may have potential applications in designing optical switching devices, ultra-compact sensors and slow light devices in the THz region.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"176 1","pages":"2638-2640"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73222584","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293336
Ke Zhang, Maokun Li, Fan Yang, Shenheng Xu, A. Abubakar
In this work, a multiplicative regularization scheme is applied to EIT data inversion. A weighted L2-norm-based regularization with edge-preserving characteristics is used as a multiplicative constraint. In this scheme, the setting of regularization parameter in the cost functional is avoided, and the relative weights between the data misfit and the regularization can be adjusted adaptively during the inversion. In this work, Gauss-Newton method is used to minimize the cost functional iteratively. In the minimization process, the gradient of the regularization factor needs to be computed. This requires discrete representation of gradient and divergence operators on triangular or tetrahedral meshes. To this end, a method based on the theory of discrete exterior calculus (DEC) is introduced to rigorously describe these operators on meshes. The inversion algorithm is tested using both synthetic and experimental data. The results show good edge-preserving and anti-noise performance of the multiplicative regularization in the EIT inverse problem.
{"title":"Electrical impedance tomography with multiplicative regularization","authors":"Ke Zhang, Maokun Li, Fan Yang, Shenheng Xu, A. Abubakar","doi":"10.1109/PIERS-FALL.2017.8293336","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293336","url":null,"abstract":"In this work, a multiplicative regularization scheme is applied to EIT data inversion. A weighted L2-norm-based regularization with edge-preserving characteristics is used as a multiplicative constraint. In this scheme, the setting of regularization parameter in the cost functional is avoided, and the relative weights between the data misfit and the regularization can be adjusted adaptively during the inversion. In this work, Gauss-Newton method is used to minimize the cost functional iteratively. In the minimization process, the gradient of the regularization factor needs to be computed. This requires discrete representation of gradient and divergence operators on triangular or tetrahedral meshes. To this end, a method based on the theory of discrete exterior calculus (DEC) is introduced to rigorously describe these operators on meshes. The inversion algorithm is tested using both synthetic and experimental data. The results show good edge-preserving and anti-noise performance of the multiplicative regularization in the EIT inverse problem.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"36 1","pages":"1326-1333"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73366737","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}
In a conventional scheme of a Brillouin Optical Time Domain Reflector (BOTDR), an electro-optic modulator (EOM) or an acoustic optical modulator (AOM) is generally utilized to modulate the continuous light into the pulse probe light. However, the fluctuation of the working point will result in the instability of the extinction ratio when an EOM is selected, and a slow modulation speed will bring about the inability of modulating a narrow pulse when an AOM is chosen. In view of the above issue, a scheme for stably modulating the pulse probe light based on a semiconductor optical amplifier (SOA) is proposed. Meanwhile, the scheme integrates a pulse signal source with a synchronous trigger output to simplify the hardware structure of the system. Firstly, a SOA optic pulse modulator is used in the optic link to produce the pulse probe light into the sensing fiber, and coherent detection is used to obtain the beat signal of the Brillouin scattering. Moreover, the microwave frequency-sweeping method is adopted to acquire the variation curves of power with the fiber length at different frequency points. Then, the Brillouin Frequency Shift (BFS) distribution along the sensing fiber can be figured out by processing the acquired original data. Specially, in order to speed the data process, a software kernel of underlying Levenberg-Marquardt algorithm is developed based on C language, and the MFC message response mechanism and multi-thread characteristics are used to build a man-machine interface. Finally, the strain distribution along the fiber can be calculated based on the proportionality coefficient of BFS change versus strain change. The experiment results show that the BFS measurement accuracy of ±3.74 MHz is achieved over a 10.7-kilometer sensing fiber with the spatial resolution of 1.2 m, meanwhile the data processing time is reduced by about 45 times compared to that when using the LabVIEW, which indicates the stable and fast BFS measurement is realized.
{"title":"A stable and fast approach for measuring brillouin frequency shift","authors":"Qing Bai, Yu Zhang, Yu Wang, Dong Wang, Bao-quan Jin, Yuncai Wang","doi":"10.1109/PIERS-FALL.2017.8293415","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293415","url":null,"abstract":"In a conventional scheme of a Brillouin Optical Time Domain Reflector (BOTDR), an electro-optic modulator (EOM) or an acoustic optical modulator (AOM) is generally utilized to modulate the continuous light into the pulse probe light. However, the fluctuation of the working point will result in the instability of the extinction ratio when an EOM is selected, and a slow modulation speed will bring about the inability of modulating a narrow pulse when an AOM is chosen. In view of the above issue, a scheme for stably modulating the pulse probe light based on a semiconductor optical amplifier (SOA) is proposed. Meanwhile, the scheme integrates a pulse signal source with a synchronous trigger output to simplify the hardware structure of the system. Firstly, a SOA optic pulse modulator is used in the optic link to produce the pulse probe light into the sensing fiber, and coherent detection is used to obtain the beat signal of the Brillouin scattering. Moreover, the microwave frequency-sweeping method is adopted to acquire the variation curves of power with the fiber length at different frequency points. Then, the Brillouin Frequency Shift (BFS) distribution along the sensing fiber can be figured out by processing the acquired original data. Specially, in order to speed the data process, a software kernel of underlying Levenberg-Marquardt algorithm is developed based on C language, and the MFC message response mechanism and multi-thread characteristics are used to build a man-machine interface. Finally, the strain distribution along the fiber can be calculated based on the proportionality coefficient of BFS change versus strain change. The experiment results show that the BFS measurement accuracy of ±3.74 MHz is achieved over a 10.7-kilometer sensing fiber with the spatial resolution of 1.2 m, meanwhile the data processing time is reduced by about 45 times compared to that when using the LabVIEW, which indicates the stable and fast BFS measurement is realized.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"1 1","pages":"1729-1734"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73687357","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293236
Betsy George, N. Bhuvana, S. Menon
Recent developments in wireless communication challenges microwave filters with more demanding requirements such as small size, light weight, high performance and low cost. Microstrip resonator have the higher performance than the conventional filtering technique for microwave devices. A triangular open loop resonator energized using electromagnetic (EM) and edge coupling is presented in this paper. Microstrip line is modified as a triangular open-loop resonator that introduces additional capacitance and inductance by re-orientation of electromagnetic field, there by selecting the operating frequencies. Depending on the type of coupling and position of the feed used the operating frequency of the filter changed for the same dimensions. EM and edge coupling is given to the resonator, when its gives band pass filters at 2.45 GHz and the effect of each coupling techniques are studied in detail. Better size reduction is observed for EM coupling than the edge coupling. The filters characteristics are analyzed in substrate FR4 epoxy by using ANSYS High Frequency Structure Simulator (HFSS) software. The design equations for the resonator predicts the frequency with less than 2% error with the simulated frequency. The optimized triangular open loop resonators are fabricated and validated using Keysight ENA 5080A Vector network Analyser. The simulated and measured of the resonator filter are comparable for center frequency, bandwidth, return loss and attenuation.
{"title":"Compact band pass filter using triangular open loop resonator","authors":"Betsy George, N. Bhuvana, S. Menon","doi":"10.1109/PIERS-FALL.2017.8293236","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293236","url":null,"abstract":"Recent developments in wireless communication challenges microwave filters with more demanding requirements such as small size, light weight, high performance and low cost. Microstrip resonator have the higher performance than the conventional filtering technique for microwave devices. A triangular open loop resonator energized using electromagnetic (EM) and edge coupling is presented in this paper. Microstrip line is modified as a triangular open-loop resonator that introduces additional capacitance and inductance by re-orientation of electromagnetic field, there by selecting the operating frequencies. Depending on the type of coupling and position of the feed used the operating frequency of the filter changed for the same dimensions. EM and edge coupling is given to the resonator, when its gives band pass filters at 2.45 GHz and the effect of each coupling techniques are studied in detail. Better size reduction is observed for EM coupling than the edge coupling. The filters characteristics are analyzed in substrate FR4 epoxy by using ANSYS High Frequency Structure Simulator (HFSS) software. The design equations for the resonator predicts the frequency with less than 2% error with the simulated frequency. The optimized triangular open loop resonators are fabricated and validated using Keysight ENA 5080A Vector network Analyser. The simulated and measured of the resonator filter are comparable for center frequency, bandwidth, return loss and attenuation.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"6 1","pages":"757-760"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79276138","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293225
Lu Xu, Hong Zhang, Chao Wang, Qiaoyan Fu
Last year, China has launched a new radar satellite on August 10th: the Chinese high spatial resolution satellite Gaofen-3 (GF-3). It is the first Chinese polarimetric imaging radar, and the only radar satellite in the Chinese High Resolution Earth Observation System. This paper introduces two fully-polarimetric (FP) modes of GF-3, and exhibits their calibrated backscattering coefficients and land classification results. The histograms of GF-3 calibrated backscattering coefficients are in good accordance with those of Radatsat-2 Fine Quad data. Besides, both unsupervised and supervised classification schemes portrait different ground objects in a rational way, and achieve satisfactory accuracies. Through the comparison to Radarsat-2 data, both backscattering information and polarimetric abilities of GF-3 are examined, which demonstrate good product quality and utilization value of GF-3.
去年，中国于8月10日发射了一颗新的雷达卫星:中国高空间分辨率卫星高分三号(GF-3)。它是中国首个极化成像雷达，也是中国高分辨率对地观测系统中唯一的雷达卫星。本文介绍了GF-3的两种全偏振模式，并展示了它们的校正后向散射系数和土地分类结果。GF-3校正后向散射系数直方图与Radatsat-2 Fine Quad数据具有较好的一致性。此外，无监督和有监督分类方案都能合理地刻画不同的地物，并取得了令人满意的精度。通过与Radarsat-2卫星数据的对比，验证了GF-3卫星的后向散射信息和极化能力，表明GF-3卫星具有良好的产品质量和利用价值。
{"title":"Classification of Chinese GaoFen-3 fully-polarimetric SAR images: Initial results","authors":"Lu Xu, Hong Zhang, Chao Wang, Qiaoyan Fu","doi":"10.1109/PIERS-FALL.2017.8293225","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293225","url":null,"abstract":"Last year, China has launched a new radar satellite on August 10th: the Chinese high spatial resolution satellite Gaofen-3 (GF-3). It is the first Chinese polarimetric imaging radar, and the only radar satellite in the Chinese High Resolution Earth Observation System. This paper introduces two fully-polarimetric (FP) modes of GF-3, and exhibits their calibrated backscattering coefficients and land classification results. The histograms of GF-3 calibrated backscattering coefficients are in good accordance with those of Radatsat-2 Fine Quad data. Besides, both unsupervised and supervised classification schemes portrait different ground objects in a rational way, and achieve satisfactory accuracies. Through the comparison to Radarsat-2 data, both backscattering information and polarimetric abilities of GF-3 are examined, which demonstrate good product quality and utilization value of GF-3.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"24 1","pages":"700-705"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79339935","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293188
Changzi Xie, Kaixue Ma, Shouxian Mou, F. Meng
This paper presents a compact 50–62 GHz monolithic passive subharmonic pumped resistive mixer (SHPRM) using a 0.15-μm GaAs pHEMT foundry process. The proposed mixer requires only a half of the LO frequency compared to a fundamentally pumped and is designed in a resistive structure advantages for no drain bias and low DC currents. The mixer includes an IF filter and a scale-down marchand balun with capacitance load. To reduce conversion loss, a quarter-wavelength shorted stub at LO frequency is in parallel with LO input line, it appearing as an open circuit to the LO frequency and also provide the return paths for the RF signals. This mixer achieve a down-conversion loss of 6.55 ± 1 dB when fix LO frequency at 25 GHz and RF frequencies range 50–58 GHz, a down-conversion loss of 4.6 ± 0.6 dB when fix LO frequency at 28 GHz and RF frequencies range 56–62 GHz. In addition, the proposed mixer exhibits more than 18 dB and 30 dB of isolation for the second harmonic of the LO signal at the radio frequency (RF) ports and at the intermediate frequency (IF) ports, respectively. The chip size is 0.85 × 1.41 mm2 only. The total dc power consumption is ∼ 0mW.
{"title":"A 50–62 GHz compact subharmonic passive mixer MMIC with low conversion loss","authors":"Changzi Xie, Kaixue Ma, Shouxian Mou, F. Meng","doi":"10.1109/PIERS-FALL.2017.8293188","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293188","url":null,"abstract":"This paper presents a compact 50–62 GHz monolithic passive subharmonic pumped resistive mixer (SHPRM) using a 0.15-μm GaAs pHEMT foundry process. The proposed mixer requires only a half of the LO frequency compared to a fundamentally pumped and is designed in a resistive structure advantages for no drain bias and low DC currents. The mixer includes an IF filter and a scale-down marchand balun with capacitance load. To reduce conversion loss, a quarter-wavelength shorted stub at LO frequency is in parallel with LO input line, it appearing as an open circuit to the LO frequency and also provide the return paths for the RF signals. This mixer achieve a down-conversion loss of 6.55 ± 1 dB when fix LO frequency at 25 GHz and RF frequencies range 50–58 GHz, a down-conversion loss of 4.6 ± 0.6 dB when fix LO frequency at 28 GHz and RF frequencies range 56–62 GHz. In addition, the proposed mixer exhibits more than 18 dB and 30 dB of isolation for the second harmonic of the LO signal at the radio frequency (RF) ports and at the intermediate frequency (IF) ports, respectively. The chip size is 0.85 × 1.41 mm2 only. The total dc power consumption is ∼ 0mW.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"89 1","pages":"490-495"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84211044","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293524
B. You, Hu Xu, Jianhua Zhou, Y. Shang, W. Li, T. Xue, Haike Xu
A dual-frequency satellite antenna is designed for the applications of global navigation satellite systems (GNSSs). The proposed antenna consists of a square radiation patch with a double-arrow array loaded, which is formed by introducing anchor-like arrows as resonators at four corners respectively. The double-arrow array, with the adjustable lengths of its internal and external branches, is loaded on the patch to control the radiation properties flexibly. The simulation results show that the operation frequencies covering B3 and L1 bands, i.e., at 1.268 GHz and 1.575 GHz, can be acquired. In addition, in order to explain the relationship between the resonances and structure dimensions, the parametric studies based on the gap size of the anchor-like arrows and the length of the resonator are also discussed. It is clear that the demand of GNSS applications could be satisfied, according to the surface currents and antenna gains at different frequencies demonstrated and analyzed in detail.
{"title":"A dual-frequency satellite antenna loaded with a double-arrow array","authors":"B. You, Hu Xu, Jianhua Zhou, Y. Shang, W. Li, T. Xue, Haike Xu","doi":"10.1109/PIERS-FALL.2017.8293524","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293524","url":null,"abstract":"A dual-frequency satellite antenna is designed for the applications of global navigation satellite systems (GNSSs). The proposed antenna consists of a square radiation patch with a double-arrow array loaded, which is formed by introducing anchor-like arrows as resonators at four corners respectively. The double-arrow array, with the adjustable lengths of its internal and external branches, is loaded on the patch to control the radiation properties flexibly. The simulation results show that the operation frequencies covering B3 and L1 bands, i.e., at 1.268 GHz and 1.575 GHz, can be acquired. In addition, in order to explain the relationship between the resonances and structure dimensions, the parametric studies based on the gap size of the anchor-like arrows and the length of the resonator are also discussed. It is clear that the demand of GNSS applications could be satisfied, according to the surface currents and antenna gains at different frequencies demonstrated and analyzed in detail.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"13 1","pages":"2323-2328"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82154534","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：