- 标题
- 摘要
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- 实验方案
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Design and characterization of the double-layered defected ground structure transmission line with less radiation loss
摘要： A double-layered DGS transmission line is proposed with a smaller DGS size and less radiation loss. Changing the air boundary to a dielectric boundary reduces the effective electric length at the DGS aperture area. An equivalent circuit model is introduced to analyze the DGS transmission line and the resonator circuit designs. Due to the increase in the effective dielectric constant, the proposed structure can be realized with less sensitivity to metallic environments. From the experimental results, the proposed double-layered DGS can achieve a reduction of 90.1% in size and insensitivity at up to 5 mm of separation from the DGS aperture to the metallic plate.
关键词： equivalent circuit models,effective dielectric constants,radiation loss,size reduction,defected ground structures
更新于2025-09-23 15:23:52
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Co-designed defected ground structure filter with UWB slot antenna
摘要： In this study, one kind of novel co-designed defected ground structure (DGS) filter with slot antenna is proposed to realize bandpass reflection coefficient and gain performance. This antenna consists of two parts: 1) a 50 Ω feeding line and 2) a modified stepped slot with additional narrow slot and defected ground structure. The extra narrow slot, which can effectively prolong the current path of low frequency and generate reflection zero, is introduced to improve the lower band-edge selectivity. DGS is used to improve the upper band-edge selectivity, which can produce transmission zeros in certain frequencies and provides excellent stopband characteristics. In addition, the modified stepped slot with DGS can produce additional resonance frequency, which is helpful to improve the in-band impedance characteristics and radiation efficiency of the antenna. Measured results show that not only the band-edge selectivity of the antenna is improved, but also the in-band impedance matching and radiation efficiency are improved. The experimental results show that the proposed design could be a good candidate for UWB applications.
关键词： UWB antenna,defected ground structures (DGS),band-edge selectivity
更新于2025-09-23 15:23:52
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A PENTA-BAND REJECT INSIDE CUT KOCH FRACTAL HEXAGONAL MONOPOLE UWB MIMO ANTENNA FOR PORTABLE DEVICES
摘要： In this paper, a novel compact hexagonal shaped ultra-wideband multiple-input multiple-output (UWB-MIMO) Koch fractal antenna is designed with penta-band rejection characteristics for portable devices. The antenna rejects the C-band downlink frequency from 3.7–4 GHz, the C-band uplink frequency from 5.75–6.05 GHz and the satellite bands from 7.45 to 8.4 GHz. The band 7.45–7.55 GHz is used by the meteorological satellite service for the geostationary satellite services. The band 7.75–7.9 GHz is used by the meteorological satellite service for non-geostationary satellite services. The band 8.025–8.4 GHz is used by the Earth exploration satellites for geostationary satellite services. The C-band and satellite bands interfere with the UWB and have been rejected using a band reject ?lter. A spiral shaped slot is introduced inside the fractal hexagonal monopole to introduce band reject characteristics. The band suppression and widening of the impedance bandwidth are achieved by using defected ground structures. The antenna has wideband impedance matching with S11 < ?10 dB in the UWB frequency range from 3.1 to 13.6 GHz and has a low mutual coupling with S21 < ?19 dB. The antenna has very low envelope correlation coe?cient of less than 0.17 and low capacity loss of 0.254, which proves that the MIMO antenna shows good diversity performance.
关键词： Koch fractal,defected ground structures,UWB-MIMO,spiral slot,penta-band rejection
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE 21st International Multi-Topic Conference (INMIC) - Karachi, Pakistan (2018.11.1-2018.11.2)] 2018 IEEE 21st International Multi-Topic Conference (INMIC) - A Compact Hairpin Filter with Stepped Hairpin Defected Ground Structure
摘要： A compact hairpin line bandpass filter is presented with two different defected ground structures (DGS). The DGS are used to reduce the distributive response of the microstrip filter. The harmonic at 2f0 is suppressed to below ?20 dB. The filter has an insertion loss (IL) greater than ?3 dB and return loss (RL) of 26 dB at the center frequency, 2.4 GHz. The designed filter has a sharp roll-off and a wide band of operation. The filter is fabricated using RO4350 substrate and measured results are compared with the simulations.
关键词： Defected Ground Structures,Bandpass Filter,Hairpin Filter,Insertion Loss
更新于2025-09-19 17:15:36
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[IEEE 2019 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) - Nanjing, China (2019.8.28-2019.8.30)] 2019 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) - Wideband Bandpass Filters Using Half-Mode Corrugated Substrate Integrated Waveguide
摘要： A wideband bandpass filter is proposed in this paper, the filter combine half-mode corrugated substrate integrated waveguide (HMCSIW) with improved dumbbell defected ground structures (DGSs). The HMCSIW technique can operate similarly with the traditional half-mode substrate integrated waveguide (HMSIW). Differently, it provides a completely floating conductor without metallic via holes. Combining two technologies together, a design of HMCSIW wideband bandpass filter (BPF) is proposed in the paper. The presented BPFs can operate in a wide band without a short circuit between different metal layers and will be widely used in integration with other RF circuits.
关键词： DGS,HMCSIW,defected ground structures,wideband bandpass filter,half-mode corrugated substrate integrated waveguide
更新于2025-09-16 10:30:52
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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) - Triple-Band Near-Field Wireless Power Transfer System Using Coupled Defected Ground Structure Band Stop Filters
摘要： For the first time, a triple-band near-field wireless power transfer (WPT) system is presented using coupled triple-band defected ground structure (DGS) bandstop filters (BSF). A triple-band DGS-BSF is possible through creating a frequency dependent effective lower inductance at higher frequencies. When we couple two triple-band DGS-BSFs in a back-to-back configuration, a triple-band DGS-WPT system is created. We verify the proposed DGS-WPT system through good agreements between electromagnetic simulations and measurements. The measured WPT efficiencies are 68%, 60%, and 65% at 100.8 MHz, 140.7 MHz, and 182.2 MHz, respectively at a WPT separation distance of 30 mm. Each of the WPT transmitter and receiver has a size of 50 × 50 mm2.
关键词： defected ground structures,wireless power transmission,mutual coupling,multi-band
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) - Bochum, Germany (2019.7.16-2019.7.18)] 2019 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP) - Double-layer Sixteenth-mode Substrate Integrated Waveguide Filter based on Defected Ground Structure
摘要： A double-layer filter is proposed, designed, and implemented through a sixteen mode substrate integrated waveguide (SMSIW) with two defected ground structures (DGS) inside the middle metal layer. The proposed filter provides four transmission zeros on both sides of the pass-band. Through the appropriate design of the sixteenth mode and filter form, the transmission zeros can be controlled with the DGS position. The proposed filters also show a compact physical size as compared to conventional SIW filters. In order to validate the simulated results, the proposed concept is designed, manufactured and measured as an experimental example. The proposed SMSIW filter is a promising component for the design of high-performance telecommunication systems.
关键词： filters,Substrate Integrated Waveguide,Double-layer,Defected Ground Structures,Sixteenth Mode
更新于2025-09-11 14:15:04