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Substrate integrated waveguide cavity backed frequency reconfigurable antenna for cognitive radio applies to internet of things applications
摘要： In this article, a new multiband frequency reconfigurable substrate integrated waveguide cavity slot antenna was designed using Computer Simulation Technology software tool for addressing the specific design challenges posed by the internet of things (IoT) based cognitive radio networks. Reconfiguration of frequency bands is achieved using PIN diodes. The antenna resonated at 2.624, 2.664, 2.720, 2.752, 4.304, 4.532, 4.556, 5.236, 5.304, 5.368, 5.332, and 5.392 GHz. The resonant frequency capability and radiation performance are demonstrated by both simulations and measurements. The simulated and measured results were in agreement. The higher efficiency, gain and average bandwidth obtained are 90%, 8.2 dBi and 65 MHz, respectively. The compactness, integrity, reliability, and performance at various operating frequencies make the proposed antenna a good candidate for IoT applications.
关键词： cognitive radio,frequency reconfigurable,PIN diodes,multiband,SIW,internet of things
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - Miniaturized Reconfigurable Dual-Band Bandstop Filter with Independent Stopband Control using Folded Ridged Quarter-Mode Substrate Integrated Waveguide
摘要： This paper presents a reconfigurable dual-band bandstop filter utilizing miniaturized folded ridged quarter-mode substrate integrated cavity. By loading a quarter-mode substrate integrated cavity with a capacitive ridge structure and folding the dominant field around said structure, significant miniaturization is achieved. Folded ridged quarter-mode substrate integrated cavity is shown to reduce the area of standard quarter-mode substrate integrated cavity by 92%, while also increasing the fundamental mode. A spurious-free reconfigurable dual-band bandstop filter using miniaturized folded ridged quarter-mode technology is designed, fabricated, and measured. In order to generate independent tuning of each stopband, two resonators are each loaded with a tunable the same capacitance, and nonresonating node, producing a frequency agile filtering section. Two filtering sections are then coupled together through an impedance inverter to produce a dual-band, two-pole bandstop filter. To the best of the authors’ knowledge, this paper presents the first dual-band bandstop filter using quarter-mode substrate integrated cavity technology in the present literature.
关键词： reconfigurable filter,folded,ridged,multiband filter,quarter-mode,substrate integrated waveguide (SIW),bandstop filter
更新于2025-09-12 10:27:22
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A quad‐band Sierpenski based fractal antenna fed by co‐planar waveguide
摘要： In this article, A Sierpenski based octagonal carpet fractal antenna is introduced for quad-band applications. The proposed antenna developed with FR-4 substrate material with relative permittivity of 4.4, thickness chosen is 1.6 mm and co-planar waveguide feed is used in this design. The antenna is designed, simulated with computer simulation technology studio suite, printed and tested. The measurement results of proposed antenna resonates at 2.4, 4.45, 9.1, 10.24, 12.46 GHz and are well suited for C-band(2.4 GHz), L-band (4.45 GHz), X-band (9.1 GHz, 10.24 GHz), Ku-band (12.46 GHz) applications. Good agreement between the results of simulation and measurement is observed with applications.
关键词： Sierpenski fractal antenna,multiband applications,quad-band,co-planar waveguide
更新于2025-09-11 14:15:04
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Mode Composite Coplanar Waveguide
摘要： In this paper, a mode composite coplanar waveguide (MCCPW) is proposed and studied. The MCCPW can be regarded as a combination of a quasi-coplanar waveguide and a substrate integrated waveguide (SIW). In this composite structure, the center conductor of the quasi-coplanar waveguide serves as the SIW supporting TE10 mode, while the TEM mode operates in the quasi-coplanar waveguide part. The characteristics and design method of the MCCPW are analyzed and illustrated in this work. The MCCPW is fabricated together with two transition structures to demonstrate its integration capability further with other planar circuits. The MCCPW is a single layer structure, and it has the advantages of joint structure and mode composition, which make it a possible solution for multifunction and multiband application systems. The measured and the simulated results agree well with each other, and good transition performances are achieved.
关键词： structure sharing,TEM mode,quasi-coplanar waveguide (QCPW),multiband,TE10 mode,substrate integrated waveguide (SIW),Mode composite coplanar waveguide (MCCPW)
更新于2025-09-11 14:15:04
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Multiband Circularly Polarized Synthetic Aperture Radar (CP-SAR) Onboard Microsatellite Constellation
摘要： Center for Environmental Remote Sensing, Chiba University develops multiband (L, C, and X bands) circularly polarized synthetic aperture radar (CP-SAR) for microsatellite SAR constellation (150 kg class). This paper explains the project, specification, antenna deployment, RF system, and ground-flight test of SAR system at Indonesia. In the future, this microsatellite SAR constellation will be employed to monitor global land deformation and environment.
关键词： Synthetic Aperture Radar,CP-SAR,Microsatellite constellation,Multiband,flight test
更新于2025-09-10 09:29:36
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[IEEE IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Valencia, Spain (2018.7.22-2018.7.27)] IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium - Enhancing the Classification of Remote Sensing Data Using Multiband Compact Texture Unit Descriptor and Deep Convolutional Neural Network
摘要： This abstract proposes a method to enhance the classification of high spatial remotely sensed imagery by using Multiband Compact Texture Unit (MBCTU) descriptor and pre-trained convolutional neural networks (CNN) feature extractor. MBCTU was used in order to take into account intra- and interband spatial interactions by characterizing texture using relative pixel values in a multispectral neighborhood instead of a monoband neighborhood. The derived new encoded images are fed to a deep feature extractor (fine-tuned CNN). Finally, the obtained deep features are classified using k nearest neighbor’s (KNN) algorithm to produce the classification map. The proposed approach is applied to the classification of hyperspectral and multispectral datasets. Results indicate that the proposed approach can achieve accurate classification results compared to other approaches using the full spectral dataset.
关键词： hyperspectral,deep learning,k nearest neighbor’s classifier,Multiband compact texture unit,Convolutional neural network
更新于2025-09-10 09:29:36
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COMPLIMENTARY SPLIT RING RESONATOR INSPIRED MEANDERED CPW-FED MONOPOLE ANTENNA FOR MULTIBAND OPERATION
摘要： A novel design of Meandered Coplanar waveguide (CPW) fed CSRR loaded multiband antenna is presented in this paper. A compact triple-band antenna is designed by etching CSRR slots on the radiating element. The proposed antenna shows good performance at all resonant frequencies. The simulation results are discussed and compared with the measured ones. The e?ects of CSRR loading on the radiating element are explained. Parametric studies are carried out and explained in detail. The proposed antenna is fabricated and measured, and the results are compared with the simulated ones. CSRR permittivity characteristics are explained to validate the results. The proposed antenna can be used for C-band, Wireless Local Area Network (WLAN) and International Telecommunications Union (ITU) applications.
关键词： WLAN,Meandered Coplanar waveguide (CPW),CSRR,multiband antenna,C-band,ITU
更新于2025-09-10 09:29:36
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[IEEE 2018 7th International Conference on Computer and Communication Engineering (ICCCE) - Kuala Lumpur, Malaysia (2018.9.19-2018.9.20)] 2018 7th International Conference on Computer and Communication Engineering (ICCCE) - Dual Band Antenna Design Using Stacked Series Array For Ka-Band Application
摘要： In this paper, a dual band stack series array antenna is designed for the future 28 GHz Ka-band application. Dual-layer substrate Technology is used to achieve multiple resonant frequencies with higher bandwidths. Antenna is designed based on stack array of double layer with patches and resonators in different layers. Designed dual-band antennas can resonate at single band of (28 GHz) and dual band (28 and 30 GHz). All results of the simulation are fabricated and tested. The test result shows that the antennas have high gain, wide bandwidth and higher efficiencies. Both the proposed antenna configurations have shown a good candidate for 5G millimetre wave (mmWave) application.
关键词： dual-layer substrate and multiband antenna,stack series array
更新于2025-09-10 09:29:36
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PEC-GRAPPA reconstruction of simultaneous multislice EPI with slice-dependent 2D Nyquist ghost correction
摘要： Purpose: To provide simultaneous multislice (SMS) EPI reconstruction with k‐space implementation and robust Nyquist ghost correction. Methods: 2D phase error correction SENSE (PEC‐SENSE) was recently developed for Nyquist ghost correction in SMS EPI reconstruction for which virtual coil simultaneous autocalibration and k-space estimation (VC-SAKE) was used to remove slice‐dependent Nyquist ghosts and intershot 2D phase variations in multi‐shot EPI reference scan. However, masking coil sensitivity maps to exclude background region in PEC‐SENSE and manually selecting slice‐wise target ranks in VC-SAKE are cumbersome procedures in practice. To avoid masking, the concept of PEC‐SENSE is extended to k‐space implementation and termed as PEC‐GRAPPA. Furthermore, a singular value shrinkage scheme is incorporated in VC-SAKE to circumvent the empirical slice‐wise target rank selection. PEC‐GRAPPA was evaluated and compared to PEC‐SENSE with/without masking and 1D linear phase correction GRAPPA. Results: PEC‐GRAPPA robustly reconstructed SMS EPI images from 7T phantom and human brain data, effectively removing the phase error‐induced artifacts. The resulting residual artifact level and temporal SNR were comparable to those by PEC‐SENSE with careful tuning. PEC‐GRAPPA outperformed PEC‐SENSE without masking and 1D linear phase correction GRAPPA. Conclusion: Our proposed PEC‐GRAPPA approach effectively removes the artifacts caused by Nyquist ghosts in SMS EPI without cumbersome tuning. This approach provides a robust and practical implementation of SMS EPI reconstruction in k‐space with slice‐dependent 2D Nyquist ghost correction.
关键词： EPI,parallel imaging,GRAPPA,SMS,multiband,Nyquist ghost
更新于2025-09-09 09:28:46
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Application of Multiband Acoustooptical Filtering of Radiation to Solution of the Object Remote Identification Problems by the Method of Programmed Linear Separation of Multispectral Optical Signals in the Case of Reflection of a Wideband Light from Objects with A Priori Known Reflection Coefficients
摘要： A new approach to solution of the problem of remote determination of spectrally complex optical signals and identification on this base of two objects out of a set of possible spatially inseparable objects located in one small ground pixel is considered. Computer simulation is performed; it is shown that the results of measurements of the mean powers of filtered signals at the outputs of two (or more) selected reference multiband acoustooptical filters (MAOFs) can ensure subsequent programmed (digital) separation of spectrally complex optical signals and identification of the objects corresponding to these signals. By the example of an arbitrarily chosen group of ten types of objects and three types of the background, computer verification of the new method is carried out with the use of realizable parameters of modern MAOFs. It has been found that, in conditions of the actual accuracy of setting and/or measuring of the energy of the main components of the problem (~1%), this method can provide unambiguous correct decision about the type of the object located on part of a pixel with a probability of ~99.9%.
关键词： programmed linear separation,multiband acoustooptical filtering,remote identification,multispectral optical signals
更新于2025-09-09 09:28:46