Pub Date : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021582
Xin Yang, X. Lin, Bao Wang
in this paper, we propose a low-profile differential-fed patch antenna with improved radiation pattern used for circularly polarized phased array The periodic antenna element is mainly composed of a radiation square patch, four L-shaped differential-fed probes which guarantee the symmetry of radiation pattern of antenna array, and a 3-dB branch-line coupler to obtain both right hand circular polarization (RHCP) and left hand circular polarization (LHCP). The periodic antenna element achieves a impedance bandwidth (10-dB return-loss) and circular polarization bandwidth (3-dB axial ratio) both more than 18% while scanning up to 45° by periodic boundary simulation. Moreover, the 3-dB axial-ratio beam-width (ARBW) is over 250° at boresight direction. The total thickness of the circularly polarized array is only 0.07 wavelength at the low operating frequency. A 4 × 4 antenna array is presented and the results are in a good agreement with the periodic element simulation.
{"title":"A Differential-fed Patch Antenna with Symmetric Radiation Pattern Used for Circularly Polarized Phased Array","authors":"Xin Yang, X. Lin, Bao Wang","doi":"10.1109/PIERS-Fall48861.2019.9021582","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021582","url":null,"abstract":"in this paper, we propose a low-profile differential-fed patch antenna with improved radiation pattern used for circularly polarized phased array The periodic antenna element is mainly composed of a radiation square patch, four L-shaped differential-fed probes which guarantee the symmetry of radiation pattern of antenna array, and a 3-dB branch-line coupler to obtain both right hand circular polarization (RHCP) and left hand circular polarization (LHCP). The periodic antenna element achieves a impedance bandwidth (10-dB return-loss) and circular polarization bandwidth (3-dB axial ratio) both more than 18% while scanning up to 45° by periodic boundary simulation. Moreover, the 3-dB axial-ratio beam-width (ARBW) is over 250° at boresight direction. The total thickness of the circularly polarized array is only 0.07 wavelength at the low operating frequency. A 4 × 4 antenna array is presented and the results are in a good agreement with the periodic element simulation.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124125861","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021679
Donghua Yang, Yang Wang, Tao Hu, Jie Liu, Wenjun Jie, Chun Jin
Electromagnetic orbital angular momentum (OAM) as the promise of enhancing spectral efficiency in informational transmission has attracted widespread attention in the fields of radio frequency and optical communications. Hitherto, two main methods have been put forward to generate beams carrying OAM in the field of communication at lower frequencies, which include spiral phase plates (SPP) and uniform circular array (UCA). However, modern multiple-input-multiple-output (MIMO) systems mainly consist of 2D linear array, which is inconvenient to combine with OAM generated by UCA. Furthermore, OAM radio suffers significant loss of due to the divergence of OAM waves, especially in high eigenmodes. In this contribution we will present the results of original work carried out into 2D linear array and sparse 2D linear array which bring benefits of orthogonal OAM modes without change the antenna systems. Work on 2D linear array will report on: i) Numerical derivation for the radiation pattern of a 2D linear array antenna is presented to generate beams carrying OAM is available; ii) An innovative simple and feasible method that utilizes genetic algorithm (GA) to reduce sideband levels by thinning array. The approach also reaches the effect of converging the power to propagating direction. First, OAM beam have been successively generated using 2D arrays. Second, optimizing the performance over different sparse rates, we aim to maintain the main lobe width substantially similar, while reducing side lobe levels to converge the energy in main direction. An example of a 64-element 2D linear sparse array are proposed and peak side lobe lever (SLL) reduces to −19.76 dB with respect to −11.56 dB for similar size ordinary 2D array. Finally, using genetic algorithm, a sparse array of less elements (some antennas are off) are proposed to generate beam which has a regular helical phase-front similar to that generated by a single ring which will help to save energy and increase efficiency. This work will help the application of orbit angular momentum in existing massive MIMO or 2D arrays and also other technology based on radio wave OAM, e.g., secure communication, quantum encryption.
{"title":"Optimizing OAM Side-lobe Levels Using Sparse 2D Array","authors":"Donghua Yang, Yang Wang, Tao Hu, Jie Liu, Wenjun Jie, Chun Jin","doi":"10.1109/PIERS-Fall48861.2019.9021679","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021679","url":null,"abstract":"Electromagnetic orbital angular momentum (OAM) as the promise of enhancing spectral efficiency in informational transmission has attracted widespread attention in the fields of radio frequency and optical communications. Hitherto, two main methods have been put forward to generate beams carrying OAM in the field of communication at lower frequencies, which include spiral phase plates (SPP) and uniform circular array (UCA). However, modern multiple-input-multiple-output (MIMO) systems mainly consist of 2D linear array, which is inconvenient to combine with OAM generated by UCA. Furthermore, OAM radio suffers significant loss of due to the divergence of OAM waves, especially in high eigenmodes. In this contribution we will present the results of original work carried out into 2D linear array and sparse 2D linear array which bring benefits of orthogonal OAM modes without change the antenna systems. Work on 2D linear array will report on: i) Numerical derivation for the radiation pattern of a 2D linear array antenna is presented to generate beams carrying OAM is available; ii) An innovative simple and feasible method that utilizes genetic algorithm (GA) to reduce sideband levels by thinning array. The approach also reaches the effect of converging the power to propagating direction. First, OAM beam have been successively generated using 2D arrays. Second, optimizing the performance over different sparse rates, we aim to maintain the main lobe width substantially similar, while reducing side lobe levels to converge the energy in main direction. An example of a 64-element 2D linear sparse array are proposed and peak side lobe lever (SLL) reduces to −19.76 dB with respect to −11.56 dB for similar size ordinary 2D array. Finally, using genetic algorithm, a sparse array of less elements (some antennas are off) are proposed to generate beam which has a regular helical phase-front similar to that generated by a single ring which will help to save energy and increase efficiency. This work will help the application of orbit angular momentum in existing massive MIMO or 2D arrays and also other technology based on radio wave OAM, e.g., secure communication, quantum encryption.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125446007","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021757
Zhiyuan Sun, Wen Hao Kang, G. Wan, Mei Song Tong
With the rapid development of rail transit, a large number of electrical devices have been used in trains, resulting in a sharp increase in electromagnetic (EM) energy in train space and an increasingly complex EM environment. Therefore, higher requirements have been put forward for the performance of the braking system and controller of heavy trains. By analyzing the control characteristic of braking system of a truck, the fuzzy PID control and neural network control are combined. Using the fuzzy reasoning of neural network, the operating state parameters of the system are modified and adjusted online. The controller not only has the ability of self-learning, self-adaptation, parallel processing, and pattern recognition, but also can learn and adapt to the dynamic characteristics of uncertain system, which can greatly improve the effect of fuzzy control and practical control ability. The fuzzy controller can effectively overcome the drawbacks of traditional braking system and provide a stronger support for fault simulation and diagnosis analysis.
{"title":"A Fuzzy PID Controller with Neural Network Algorithm for Freight Trains’ Braking System","authors":"Zhiyuan Sun, Wen Hao Kang, G. Wan, Mei Song Tong","doi":"10.1109/PIERS-Fall48861.2019.9021757","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021757","url":null,"abstract":"With the rapid development of rail transit, a large number of electrical devices have been used in trains, resulting in a sharp increase in electromagnetic (EM) energy in train space and an increasingly complex EM environment. Therefore, higher requirements have been put forward for the performance of the braking system and controller of heavy trains. By analyzing the control characteristic of braking system of a truck, the fuzzy PID control and neural network control are combined. Using the fuzzy reasoning of neural network, the operating state parameters of the system are modified and adjusted online. The controller not only has the ability of self-learning, self-adaptation, parallel processing, and pattern recognition, but also can learn and adapt to the dynamic characteristics of uncertain system, which can greatly improve the effect of fuzzy control and practical control ability. The fuzzy controller can effectively overcome the drawbacks of traditional braking system and provide a stronger support for fault simulation and diagnosis analysis.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121733744","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021413
D. Gu, M. Feng, Zhijie Xie, F. Wei, Yajun Wu
This paper presents a fast algorithm for radar image generation. In this approach, the three-dimensional (3-D) complex scattering function of a complex man-made target is first predicted by a high-frequency EM technique, and then projected onto the two dimensional (2-D) image projection plane (IPP). A fast point-spread operation using 2-D window function is finally made in the frequency domain to obtain a radar image. The developed algorithm is applicable to the online prediction of templates as well as to establish a plentiful training data base for machine learning based automatic target recognition. As an example, a ship recognition approach based on 2-D hot scattering point image is presented by using the proposed algorithm. Experimental results for simulated and TerraSAR-X images demonstrate the usefulness and practicability of the proposed algorithms.
{"title":"A Fast Generation Algorithm of Radar Images for Ship Recognition","authors":"D. Gu, M. Feng, Zhijie Xie, F. Wei, Yajun Wu","doi":"10.1109/PIERS-Fall48861.2019.9021413","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021413","url":null,"abstract":"This paper presents a fast algorithm for radar image generation. In this approach, the three-dimensional (3-D) complex scattering function of a complex man-made target is first predicted by a high-frequency EM technique, and then projected onto the two dimensional (2-D) image projection plane (IPP). A fast point-spread operation using 2-D window function is finally made in the frequency domain to obtain a radar image. The developed algorithm is applicable to the online prediction of templates as well as to establish a plentiful training data base for machine learning based automatic target recognition. As an example, a ship recognition approach based on 2-D hot scattering point image is presented by using the proposed algorithm. Experimental results for simulated and TerraSAR-X images demonstrate the usefulness and practicability of the proposed algorithms.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121754337","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021829
Kainan Qi, Luchao Wang, Shulan Kong, Yan Wang
A novel broadband metamaterial absorber (MMA) is presented in this paper. The absorber is a single layer structure based on the topology of a high impedance surface (HIS), but in which the conventional top layer is replaced by an active frequency selective surface (AFSS) loading with resistors and varactor diodes. The absorbing resonant frequency of the MMA changes by adjusting the capacitance of varactor. Simulated results show that the absorption of the absorber covers a broadband of 2.35 GHz-11.45 GHz above 98% when the capacitance increases from 0.1 pF to 5 pF. At the same time, the total thickness of this absorber, 2 mm, is only λ/64 of the lower limit frequency.
{"title":"Design of an Ultra-thin Tunable Metamaterial Absorber for Broadband Frequency Applications","authors":"Kainan Qi, Luchao Wang, Shulan Kong, Yan Wang","doi":"10.1109/PIERS-Fall48861.2019.9021829","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021829","url":null,"abstract":"A novel broadband metamaterial absorber (MMA) is presented in this paper. The absorber is a single layer structure based on the topology of a high impedance surface (HIS), but in which the conventional top layer is replaced by an active frequency selective surface (AFSS) loading with resistors and varactor diodes. The absorbing resonant frequency of the MMA changes by adjusting the capacitance of varactor. Simulated results show that the absorption of the absorber covers a broadband of 2.35 GHz-11.45 GHz above 98% when the capacitance increases from 0.1 pF to 5 pF. At the same time, the total thickness of this absorber, 2 mm, is only λ/64 of the lower limit frequency.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115804726","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021398
D. Tian, Amin Kianinejad, Anexue Zhang
A tunable 360 degree phase shifter based on active spoof surface plasmon polaritons (SSPP) waveguide is proposed for the first time. The device consists of a passive SSPP waveguide and 7 varactor diodes are applied on it. The working principle of the tunable phase shifter is that the dispersion curve is tunable with different applied capacitance, which means different transmission phase of one unit cell is achieved with different capacitances. Both the full wave and Eigenmode simulation show a variation of 180-360 degrees tunable phase within 6.6-7.2 GHz. This design further extend the application of SSPPS.
{"title":"Tunable 360 Degrees Phase Shifter Based on Spoof Surface Plasmon Polaritons Waveguide","authors":"D. Tian, Amin Kianinejad, Anexue Zhang","doi":"10.1109/PIERS-Fall48861.2019.9021398","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021398","url":null,"abstract":"A tunable 360 degree phase shifter based on active spoof surface plasmon polaritons (SSPP) waveguide is proposed for the first time. The device consists of a passive SSPP waveguide and 7 varactor diodes are applied on it. The working principle of the tunable phase shifter is that the dispersion curve is tunable with different applied capacitance, which means different transmission phase of one unit cell is achieved with different capacitances. Both the full wave and Eigenmode simulation show a variation of 180-360 degrees tunable phase within 6.6-7.2 GHz. This design further extend the application of SSPPS.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131945995","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021289
Hamid Dhanyal, Wei-dong Hu, Ali Ahmed, H. Nawaz, M. Waseem
Design of a high power, high efficiency GaN HEMT based Class F power amplifier with harmonic termination network, operational at 2.1 GHz, has been presented in this paper. Optimum source and load impedances for fundamental tone, 2nd and 3rd harmonics were extracted using load and source pull analysis. Effect of with and without harmonic termination on the performance of class F power amplifier is investigated in term of output power, power added efficiency and drain bias variation. Proposed class F power amplifier is fabricated using RT/Duroid 5870 of 20 mil thickness. Designed structure possess power added efficiency of 72% with high output power of 36.3 dBm. In order to further enhance efficiency of power amplifier, it was operated at lower drain bias current resulting in efficiency enhancement of 6% with no significant change in output power performance.
{"title":"High Efficiency GaN HEMT Class F Power Amplifier for S-band Telemetry Application","authors":"Hamid Dhanyal, Wei-dong Hu, Ali Ahmed, H. Nawaz, M. Waseem","doi":"10.1109/PIERS-Fall48861.2019.9021289","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021289","url":null,"abstract":"Design of a high power, high efficiency GaN HEMT based Class F power amplifier with harmonic termination network, operational at 2.1 GHz, has been presented in this paper. Optimum source and load impedances for fundamental tone, 2nd and 3rd harmonics were extracted using load and source pull analysis. Effect of with and without harmonic termination on the performance of class F power amplifier is investigated in term of output power, power added efficiency and drain bias variation. Proposed class F power amplifier is fabricated using RT/Duroid 5870 of 20 mil thickness. Designed structure possess power added efficiency of 72% with high output power of 36.3 dBm. In order to further enhance efficiency of power amplifier, it was operated at lower drain bias current resulting in efficiency enhancement of 6% with no significant change in output power performance.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132241951","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021381
Binglian Xiao, F. Lan, Ziqiang Yang, P. Mazumder, Zongjun Shi, Yihui Xu, Hongxin Zeng, Jing Yin
Due to the inefficiency of effective wave modulation components and dynamical metamaterial in terahertz (THz) range, an alternative approach of frequency sweeping for beam scanning based on a metasurface structure is proposed here. Aiming at broadband and high-efficiency circular-polarized terahertz frequency-scanning, we start with combining Pancharatnam-Berry scheme and generalized Snell’s law to initiate the fundamental schematic design. The hybrid structural unit is composed of an I-shaped dipole and two rectangular dipoles for multi-resonance leading to broadband width. In order to realize directional deflection, the metasurface is arranged through eight rotated units with a fixed π/4 phase differences between adjacent units to reach 2π consecutive phase shift. A 45° phase difference among eight units adjacent in x axis keep in excellent linear maintenance with a bandwidth from 1 THz to 2.1 THz. The simulation result verifies the reflection efficiency of the unit reaches 90% in the operating frequency range. Under right-handed circular polarized normal incident wave, the frequency bandwidth is 1.1 THz (from 1 to 2.1 THz) with a scanning angle range from 17° to 38°. The simulation result is in good agreement with the theoretical analysis. In addition, the reflection efficiency of the scanning beam is more than 50% in the operating frequency range, and the maximum reflection efficiency of the scanning beam achieves 88% at 1.6 THz, which indicates the remarkable inhibition of the unwanted diffraction. The metasurface presented here features the advantages of a wide operating bandwidth and high efficiency, which has potential applications in fast THz imaging, moving target detection and wireless communication.
{"title":"Broadband and High-efficiency Circular-polarized Terahertz Frequency Scanning Metasurface","authors":"Binglian Xiao, F. Lan, Ziqiang Yang, P. Mazumder, Zongjun Shi, Yihui Xu, Hongxin Zeng, Jing Yin","doi":"10.1109/PIERS-Fall48861.2019.9021381","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021381","url":null,"abstract":"Due to the inefficiency of effective wave modulation components and dynamical metamaterial in terahertz (THz) range, an alternative approach of frequency sweeping for beam scanning based on a metasurface structure is proposed here. Aiming at broadband and high-efficiency circular-polarized terahertz frequency-scanning, we start with combining Pancharatnam-Berry scheme and generalized Snell’s law to initiate the fundamental schematic design. The hybrid structural unit is composed of an I-shaped dipole and two rectangular dipoles for multi-resonance leading to broadband width. In order to realize directional deflection, the metasurface is arranged through eight rotated units with a fixed π/4 phase differences between adjacent units to reach 2π consecutive phase shift. A 45° phase difference among eight units adjacent in x axis keep in excellent linear maintenance with a bandwidth from 1 THz to 2.1 THz. The simulation result verifies the reflection efficiency of the unit reaches 90% in the operating frequency range. Under right-handed circular polarized normal incident wave, the frequency bandwidth is 1.1 THz (from 1 to 2.1 THz) with a scanning angle range from 17° to 38°. The simulation result is in good agreement with the theoretical analysis. In addition, the reflection efficiency of the scanning beam is more than 50% in the operating frequency range, and the maximum reflection efficiency of the scanning beam achieves 88% at 1.6 THz, which indicates the remarkable inhibition of the unwanted diffraction. The metasurface presented here features the advantages of a wide operating bandwidth and high efficiency, which has potential applications in fast THz imaging, moving target detection and wireless communication.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132388080","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 : 2019-12-01DOI: 10.1109/PIERS-Fall48861.2019.9021645
Xinlin Xia, Yingjiang Guo, Xu Cheng, Xianhu Luo
This letter presents an improved UWB bandpass filter with sharp selectivity and a notch-band. Its fundamental structure is mainly based on a half-wavelength resonator using asymmetric parallel-coupled line. A center-tapped short-stub is connected at the symmetrical plane of the filter. As a result, two transmission zeros at the lower and upper passband / stopband edges are obtained. Moreover, one open parallel-coupled line is introduced to achieve a notch-band. Measured results indicate that the proposed filter has achieved a bandwidth of 110.6% from 3.05 to 10.6 GHz with a notch-band at 8.5 GHz. In addition, this filter can offer some other advantages such as sharp roll-off and compact size (0.63λg × 0.33λg), which make it attractive for the practical applications in UWB systems.
{"title":"An Improved UWB Bandpass Filter with a Notch-band Based on Asymmetric Parallel-coupled Line with Compact Size","authors":"Xinlin Xia, Yingjiang Guo, Xu Cheng, Xianhu Luo","doi":"10.1109/PIERS-Fall48861.2019.9021645","DOIUrl":"https://doi.org/10.1109/PIERS-Fall48861.2019.9021645","url":null,"abstract":"This letter presents an improved UWB bandpass filter with sharp selectivity and a notch-band. Its fundamental structure is mainly based on a half-wavelength resonator using asymmetric parallel-coupled line. A center-tapped short-stub is connected at the symmetrical plane of the filter. As a result, two transmission zeros at the lower and upper passband / stopband edges are obtained. Moreover, one open parallel-coupled line is introduced to achieve a notch-band. Measured results indicate that the proposed filter has achieved a bandwidth of 110.6% from 3.05 to 10.6 GHz with a notch-band at 8.5 GHz. In addition, this filter can offer some other advantages such as sharp roll-off and compact size (0.63λg × 0.33λg), which make it attractive for the practical applications in UWB systems.","PeriodicalId":197451,"journal":{"name":"2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132516976","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：