- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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A dual-band circularly polarized microstrip patch antenna with a cross shaped slot for 0.92/2.45 GHz RFID applications
摘要： A double-band circularly polarized (CP) patch antenna is presented. It is a round patch antenna with a cross-shape slot. Furthermore, it radiates wide beam CP waves at two radio-frequency identification (RFID) bands: 920 MHz and 2.45 GHz. Slightly oblate round patch antennas generally radiate CP waves and have resonant frequencies at two or more harmonic bands. To radiate wide beam CP waves at two bands, a cross-shape slot was made on a round patch antenna in this study. As a result, the cross-shape slot has made it possible for a 920 MHz round patch antenna to simultaneously radiate wide beam CP waves at 2.45 GHz which is higher than a harmonic frequency.
关键词： circularly polarized,RFID,cross shaped slot,double-band,patch antenna
更新于2025-09-23 15:23:52
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UWB radar cross section reduction in a compact antipodal Vivaldi antenna
摘要： This paper presents the design of a compact antipodal Vivaldi antenna (AVA) with reduced radar cross section (RCS) for directional UWB communications. The impedance characteristics of a conventional AVA are improved by introducing a BALUN taper in the ground plane and circular slots of different diameters in the wings of the AVA. The slots on the wings improve the RCS performance of the antenna by rejecting the orthogonal radiations from the AVA. Furthermore, drills of suitable diameter are introduced to further enhance the monostatic RCS performance. The proposed AVA offers 74% size reduction compared to the existing AVAs reported in literature with its bandwidth extending from 3 GHz to over 12 GHz. The prototype AVA is fabricated and the simulation results are veri?ed using experimental measurements. The prototype antenna offers at least 11 dB reduction in RCS throughout the operating bandwidth with a peak reduction of 16 dB at 7 GHz and 11 GHz.
关键词： Vivaldi antenna,UWB,Tapered slot antenna,Stealth applications,Monostatic RCS
更新于2025-09-23 15:23:52
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Broadband simultaneously RHCP-LHCP radiating microstrip fed rectangular slot antenna for polarization diversity applications
摘要： In this article, for the first time, an antenna that can radiate LHCP and RHCP waves simultaneously is presented. The antenna enables simultaneous transmission of both right-handed (RH) and left-handed (LH) circular polarized (CP) waves separately over an elevation range from -45 to 45 degrees from the zenith. The simultaneous radiation of dual sense CP in the different spatial directions enables the antenna to act as polarization diversity transmitter. The mechanism of virtual sequential rotation of magnetic currents inside the different parts of the slot, excited with uniform phase fields results in dual CP generation. The uniform phase orthogonal fields are generated in the different parts of the slot essentially by exciting the full wavelength rectangular slot loaded with grounded stubs, symmetrically, with a shorted microstrip line. The final design of the slot antenna arrived with a rigorous parametric study on different dimensional parameters of slot and grounded stub. The measured impedance bandwidth of 22.5% centered around 7 GHz and axial ratio bandwidth of 19% is achieved. An overlapping bandwidth of 17% is achieved where both matching and AR are very good. The measured isolation between the RHCP and LHCP in the above-mentioned elevation ranges is maintained above 10 dB. The simulated and experimental results are matching very well.
关键词： right-handed CP,magnetic currents,Mobile satellite communications,axial ratio,rectangular slot,polarization diversity,left-handed CP,simultaneous dual CP
更新于2025-09-23 15:23:52
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Adaptation of Babinet's Principle for Complementary Antennas in a Dielectric Half-Space
摘要： Babinet’s Principle is widely known to relate the impedances of complementary structures. However, the usefulness of the principle is fundamentally limited by the requirement that the complementary structures be in homogeneous media - preventing its use for modern printed circuit board style constructed antennas with a dielectric backing. This letter shows a modification of Babinet’s Principle to describe the impedance relationship of complementary structures in a dielectric half-space - providing a deeper theoretical understanding of complementary structure behavior. This provides a first step toward an analytical solution for Babinet’s Principle applied to finite dielectric backings.
关键词： planar antennas,Babinet’s Principle,dipole,slot antenna
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Mutual Coupling Reduction Using I-Shaped Microstrip Line and X-Shaped Slot
摘要： A novel decoupling structure composed of an I-shaped microstrip line and an X-shaped slot etched from the ground plane is proposed and applied to decouple the conventional antenna array at 5.25GHz, whose typical edge-to-edge distance is 10mm (0.175λ0). Results indicate that the structure has superior decoupling capability, achieving a maximum 34.2dB reduction of mutual coupling. With wider impedance bandwidth, high isolation and improved gain, the structure is potential in the application of multi-element array and communication system.
关键词： slot,microstrip line,mutual coupling,antenna array
更新于2025-09-23 15:22:29
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[Communications in Computer and Information Science] Advances in Signal Processing and Intelligent Recognition Systems Volume 968 (4th International Symposium SIRS 2018, Bangalore, India, September 19–22, 2018, Revised Selected Papers) || Design of a Compact High Gain Wide Band Ψ Shaped Patch Antenna on Slotted Circular Ground Plane
摘要： A compact wideband high gain W shaped patch antenna on circular ground plane is proposed. The patch is designed and fabricated on FR4 substrate with a thickness of 1.6 mm and is compact in size as 122.7 mm2 including ground plane. The SMA connector with a center radius of 0.36 mm is connected at a coordinate (x = 5 mm, y = 3.3125 mm) as a feeding line to give RF signal as input. A wide impedance bandwidth is obtained due to the slots on the radiating element and by placing shorting post near zero potential ?elds makes the structure compact. An impedance bandwidth is further enhanced by placing an inverted U-slot on ground plane. The proposed structure is resonating at ?ve different frequencies 1.924 GHz, 2.88 GHz, 5.29 GHz, 8.58 GHz and 12.27 GHz yields an impedance bandwidth of 345 MHz, 92 MHz, 200 MHz and 4.77 GHz respectively. Re?ection coef?cient (S11) at 8.58 GHz & 12.27 GHz is ?36.37 dB and ?44.61 dB respectively. The proposed antenna is giving a maximum gain of 6.1 dB and has a stable radiation pattern with in the resonating band. The designed antenna is fabricated and is experimentally validated for the results. It reveals that the proposed antenna is suitable for WLAN and X band applications.
关键词： X band,Circular ground plane,WLAN band,Shorting post,Inverted U slot
更新于2025-09-23 15:22:29
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A Gain-Enhanced Tri-Band Microstrip Square Antenna with Consistent Radiation Patterns by Manipulating its Higher-Order Modes
摘要： A gain-enhanced tri-band microstrip antenna using higher-order modes was analyzed and designed in this communication. It firstly proved in theory that by manipulating the equivalent magnetic currents' (EMCS) relative magnitudes, the higher-order modes' radiation patterns could be converted from conical to broadside. Their zenithal directivities would therefore greatly increase. The relationships between the EMCS' relative magnitudes and the directivities were studied. Then, those analyses were applied to design a gain-enhanced tri-band microstrip antenna using three higher-order modes. A simpler one-port differential feeding and several shorting pins and slots were used to control the antenna's EMCS to improve its radiation patterns. They could further increase the antenna's gains, suppress its side-lobe levels (SLLs) and cross-polarizations. The proposed antenna worked at 3.9 GHz, 4.95 GHz, and 5.9 GHz with consistent broadside radiation patterns and the same polarization. Their measured gains were about 10.0 dBi, 10.4 dBi, and 10.2 dBi, respectively.
关键词： gain-enhanced,microstrip antenna,slot,equivalent magnetic currents,shorting pins,higher-order modes
更新于2025-09-23 15:22:29
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Simple Design Procedure of a Broadband Circularly Polarized Slot Monopole Antenna Assisted by Characteristic Mode Analysis
摘要： In this paper, a systematic design procedure of a compact and broadband circularly polarized (CP) antenna is proposed. The antenna is first designed with a C-shaped monopole, and then a C-shaped slotted patch is utilized to produce CP radiation in the lower frequency band. Thus, the antenna's overall CP bandwidth (BW) is significantly increased. In addition, unlike the conventional method in which the operation is verified by the simulated surface current distribution, characteristic mode analysis (CMA) is carried out to give more insight into different modes on the antenna and generation of circular polarization. The CMA also helps to realize a structural optimization and identify an efficient feed location. The optimized antenna prototype with a compact size of 0.29λo × 0.29λo × 0.01λo (λo is the minimum wavelength at the minimum operation frequency) achieves a usable 10-dB reflection coefficient and 3-dB axial ratio fractional BW of 91% (2.1–5.6 GHz). The antenna realized broadside gain varies from 1.5 to 3.2 dBic within this measured overlapped BW.
关键词： UWB antenna,slot,circularly polarized (CP),monopole,characteristic mode (CM)
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Broadband Circularly Polarized U-Slot Antenna for Wireless Application
摘要： The antenna presented in this paper is a broadband circularly polarized U slot antenna. The circularly polarized radiation is achieved in this paper by suspending two separated rectangular strips from the inner edge of ground and using inverted L-shaped central feeding stub. The L-shaped stub is oriented at 90 degree with respect to grounded strips. The impedance bandwidth of the antenna proposed here varies from (4.68 - 6.42 GHz) which is 31.3% and the axial ratio bandwidth (<3 dB) is from (5.15-6.45 GHz) which is 22.4% for WLAN (ranging from 5.15 to 5.85 GHz) and WIMAX (5.8GHz,5.5 GHz) applications. The antenna is left and right hand circularly polarized in Z>0 and Z<0 directions respectively. A wide notch is cut from the ground which enhances the ARBW by 51.35% in comparison to simple square shaped ground. All the results have been simulated successfully.
关键词： circular polarization (CP),axial ratio bandwidth (ARBW),slot antenna,coplanar waveguide (CPW),wireless LAN
更新于2025-09-23 15:22:29
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Three-Way Multiple-Mode Cavity Filtering Crossover for Narrowband and Broadband Applications
摘要： In this paper, the design of a cavity crossover with three intersecting channels is presented. The three fundamental modes of a cavity resonator, namely, TE011, TE101, and TM110 modes, are adopted to resonate at each of three channels, respectively. Due to the modal orthogonality of these fundamental modes, high isolation among three channels can be achieved. Two kinds of crossovers, for narrowband and broadband applications, are presented. For the narrowband case, the proposed crossover resonates at 2.91 GHz with the fractional bandwidth of 1.4%. For the broadband case, the proposed crossover resonates at 3 GHz with the fractional bandwidth of 24%. The isolations of both designs reach more than 50 dB. For a proof of concept, the broadband example of the cavity crossover structures is fabricated and measured. A good agreement between the simulated and the measured results verifies the accuracy of the proposed design methodology.
关键词： slot coupling,multiple mode,Broadband,three channel,cavity crossover,triple-mode rectangular cavity,resonator (TMR)
更新于2025-09-23 15:22:29