- 标题
- 摘要
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- 实验方案
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A broadband circularly polarized monopole antenna
摘要： A compact modified C-shaped monopole antenna with broadband circular polarization is proposed, fabricated and measured. The antenna structure is simple and only consists of combined modified C-shaped radiation patch and an improved ground plane with the overall size of 25 × 25 × 1 mm3. By cutting the corner on the modified C-shaped patch and adding triangular stubs on the ground plane, the wide impedance bandwidth and axial ratio bandwidth are achieved. The design process of the antenna is given, and the circular polarization mechanism of the circularly polarized antenna is analyzed from the surface current distributions. The measured impedance bandwidth is 95.2% (4.4-12.4 GHz) with return loss better than 10 dB, and the measured 3 dB axial ratio bandwidth is 96.8% (4.42-12.72 GHz). The peak gain is above 3.0 dBi within the working band, which indicates that it is suitable for application of ultra-wideband (UWB) wireless communication systems and satellite communication systems.
关键词： axial ratio,ultra-wideband (UWB),monopole antenna,circular polarization
更新于2025-09-23 15:23:52
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Planar UWB Monopole Antenna with Tri-Band Rejection Characteristics at 3.5/5.5/8 GHz
摘要： A triple band-notched ultrawide band (UWB) antenna is presented to avoid the interference of services working in the UWB band, such as WLAN, WiMAX and X-band satellite systems. The arc H-shaped slot on the radiating patch creates a low frequency notched band, while the other two band-notched bands are formed by cutting narrow slots on the ground plane. The presented antenna can operate on the ultrawide band efficiently and inhibit interference from three different kinds of narrow band communication systems. The simulation and measurement results show that the antenna has excellent band-notched function on the rejectband and almost omnidirectional radiation pattern on the passband.
关键词： planar monopole antenna,slots,triple band-notched,ultrawide band (UWB) antenna
更新于2025-09-23 15:23:52
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[IEEE 2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM) - Waterloo, ON (2018.8.19-2018.8.22)] 2018 18th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM) - A Log-Periodic Monopole Array with Uniform Spacing
摘要： This paper presents a log-periodic monopole array antenna with end-fire radiation and vertical polarization. It consists of 13 monopole elements and a meandering microstrip line on the bottom as the feeding line. The adjacent monopoles are of uniform spacing instead of conventional logarithmic spacing. A prototype is fabricated and tested. Measured results show that an impedance bandwidth from 2 to 6 GHz (3:1) for VSWR < 2 and a realized gain better than 7.6 dBi over the same operating frequency band are obtained.
关键词： log-periodic antenna,End-fire radiation,monopole array,uniform spacing
更新于2025-09-23 15:23:52
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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 Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Broadband Circularly Polarized Monopole Antenna with an Open loop
摘要： A broadband circularly polarized (CP) monopole antenna with an annular open-loop is presented. By introducing a gap on the loop, the presented antenna features broadband and produces a bidirectional CP radiation. The simulated results show that the proposed antenna has the advantage of broadband CP characteristics in terms of an impedance bandwidth with S11< -10 dB of 96.1% from 2.7 to 7.7 GHz and a 3-dB axial ratio (AR) bandwidth of 81.3% in the frequency range of 2.7 to 6.4 GHz.
关键词： circular polarization,Loop antenna,broadband,monopole antenna
更新于2025-09-23 15:22:29
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Optically reconfigurable planar monopole antenna for cognitive radio application
摘要： Frequency reconfigurable antenna is one of the important elements needed for cognitive radio application. Such antenna can be designed using highly resistive (HR) silicon (Si) operating as an optical switch. This letter presents a novel frequency reconfigurable planar monopole antenna suitable for cognitive radio application. The antenna is designed using HR Si working as an optical switch. The main idea behind the design of antenna is the redistribution of surface current on the antenna while changing the state of Si switches optically from high resistance to low resistance. The antenna is highly compact and uses only two switches for multiband reconfiguration. It is switchable on 1.9 GHz, 2.75 GHz, 3.7 GHz, 4.1 GHz, 4.6 GHz, 4.8 GHz, and 7.6 to 11 GHz frequency bands. Simulated and measured results are presented for the antenna. To the best of authors knowledge, this is the first multiband optically reconfigurable planar monopole antenna.
关键词： high-resistive (HR) silicon,optical excitation,low-resistive (LR) silicon,planar monopole antenna,cognitive radio,reconfigurable,multiband
更新于2025-09-23 15:22:29
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Multi-fidelity EM simulations and constrained surrogate modelling for low-cost multi-objective design optimisation of antennas
摘要： In this study, a technique for low-cost multi-objective design optimisation of antenna structures has been proposed. The proposed approach is an enhancement of a recently reported surrogate-assisted technique exploiting variable-fidelity electromagnetic (EM) simulations and auxiliary kriging interpolation surrogate, the latter utilised to produce the initial approximation of the Pareto set. A bottleneck of the procedure for higher-dimensional design spaces is a large number of training data samples necessary to construct the surrogate. Here, the authors propose a procedure that allows us to confine the model domain to the subset spanned by the reference points, including the extreme Pareto-optimal designs obtained by optimising the individual objectives as well as an additional design that determines the Pareto front curvature. Setting up the surrogate in the constrained domain leads to a dramatic reduction of the required number of data samples, which results in lowering the overall cost of the optimisation process. Furthermore, the model domain confinement is generic, i.e. applicable for any number of design goals considered. The proposed technique is demonstrated using an ultra-wideband monopole antenna optimised with respect to three objectives. Significant reduction of the design cost is obtained as compared to the reference surrogate-assisted algorithm.
关键词： Pareto set,antenna structures,variable-fidelity EM simulations,kriging interpolation surrogate,multi-objective design optimisation,ultra-wideband monopole antenna
更新于2025-09-23 15:21:21
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[IEEE 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Odessa, Ukraine (2018.9.4-2018.9.7)] 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Radiation Resistance of Resonant Impedance Monopole Placed on Metal Square Screen
摘要： The asymptotical solution of the 3-D vector problem of diffraction of the field of the monopole with the uniform distributed surface impedance, placed on the ideally conducting rectangular screen with the sides sizes L and W is obtained. Within the frame of the uniform geometrical theory of diffraction the radiation field in a far zone is represented as the sum of the geometric optics field from an impedance monopole placed on infinite screen, and the diffracted fields from the rectangular screen edges. The radiation resistances are calculated by the Poynting vector method as the functions of the monopole’s surface impedance and the sizes of monopole and screen. The input impedances of the same monopoles on the square screens have calculated using commercial software too. It is shown that at all surface impedances and monopole’s lengths the radiation and input resistances reach maximum at L=W=0.9 of wavelength.
关键词： impedance monopole,surface impedance,square screen,radiation resistance,input impedance,amplitude
更新于2025-09-23 15:21:21
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[IEEE 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - Odessa, Ukraine (2018.9.4-2018.9.7)] 2018 9th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS) - The Quasi-Fractal Microstrip Antenna
摘要： The results of study of integral characteristics of quasi-fractal circular-patch monopole antennas are presented. They are obtained by using the Finite Element Method (FEM). The spectral characteristics, matching characteristics with external circuits, the pattern characteristics are presented. The results obtained show that quasi-fractal monopole microstrip resonators can be successfully used to provide the necessary integral parameters and to form the required parameters of radiated fields.
关键词： fractal,disk monopole,pattern characteristic,microstrip,spectrum
更新于2025-09-23 15:21:21
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Printed dual-frequency quasi-Yagi antenna with a monopole driver
摘要： The printed dual-frequency quasi-Yagi antenna with a monopole driver and one-side implementation is proposed for central frequencies f01 = 1.765 GHz and f02 = 1.9 GHz. The antenna contains 2 directors and one reflector which are used as low- and high-frequency passive elements simultaneously.
关键词： printed implementation,dual-frequency antenna,quasi-Yagi antenna,monopole driver
更新于2025-09-23 15:21:01