- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Improved design of CELC meta-resonators for bandwidth improvement and miniaturization of patch antenna
摘要： For metamaterial resonators, the essential figure of merit is its effective medium ratio (EMR), which is defined as the ratio of the resonant wavelength and lattice constant. In this paper, an altered topology of the electric-inductive–capacitive (ELC) metamaterial with an improved EMR is proposed. The proposed structure shrinks the electrical footprint of the conventional ELC resonator by accommodating additional inductance by meandering the arms of the resonator and fitting interdigital capacitors in the capacitive gap. The metamaterial properties of the proposed structure are investigated by parameter extraction, and analytical formulations are carried out for finding its resonant frequency. The proposed metamaterial structure is employed for performance enhancement and miniaturization of a standard patch antenna. A 3 × 4 array of the modified complementary resonators is etched in the ground plane of a patch antenna. A significant 293% improvement in bandwidth, with a miniaturization factor (unloaded frequency/loaded frequency) of 1.33 is achieved. The entire antenna resides in a small area of 37.5 mm × 37.5 mm. The design is substantiated both by simulation and experimental results, which complement each other. The presented design can be used for Mobile WiMAX (2.5–2.69 GHz) applications.
关键词： ELC resonator,bandwidth improvement,patch antenna,metamaterial resonators,miniaturization
更新于2025-09-10 09:29:36
-
[IEEE 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - Chengdu, China (2018.3.26-2018.3.28)] 2018 IEEE International Conference on Computational Electromagnetics (ICCEM) - A Miniaturized Cavity-Backed Sector Antenna with Bandwidth Enhancement for UAV Applications
摘要： A novel miniaturized cavity-backed sector antenna for VHF (Very High Frequency) applications is proposed in this paper. The proposed antenna is composed of two symmetrical meandering lines, a planar double-sector patch and a U-shaped backed-cavity. Two symmetrical meandering lines are used to achieve size reduction by connecting four ends of the double-sector patch. Moreover, a U-shaped backed-cavity is employed to improve directivity and achieve better gain. The proposed has a very compact size of 36cm×40cm×25cm (0.13λ0×0.15λ0×0.09λ0), which could bring considerable benefits for the design of UAV system. Simulated results show that the antenna achieves a return loss better than 10dB over 31% impedance bandwidth. The gain of this antenna is more than 2dBi. With features such as small size, wide bandwidth and good directivity, the proposed antenna can meet the demanding requirements to the application of UAV airborne system.
关键词： bandwidth enhancement,sector antenna,miniaturization,VHF antenna,broadband antenna
更新于2025-09-10 09:29:36
-
GENERATION, APPLICATION AND ANALYSIS OF A NOVEL FAMILY OF M-SEGMENT QUADRATIC FRACTAL CURVES TO ANTENNAS
摘要： A novel family of fractal curves is proposed which provides the designer a systematic way of miniaturizing the microwave components with the freedom of choosing among form factor, design complexity and achieved miniaturization. The proposed fractal curve is characterized by two integer values m and n. The m value determines the form factor of the fractal while n value governs the iteration number. The equations governing the geometry of fractals are also presented. The proposed fractal is characterized for miniaturization by designing a printed monopole antenna for various values of m and n. The results from the full wave simulations and experiments are analysed and explained. The effect of fractal on reducing the resonant frequency is quantified by an equation based on its physical interpretation. Based on this analysis, saturation point for miniaturization is established. The curves being symmetric around a straight line, distortionless radiation patterns are seen.
关键词： fractal curves,microwave components,resonant frequency,monopole antenna,miniaturization
更新于2025-09-09 09:28:46
-
A MINIATURIZED BANDPASS FREQUENCY SELECTIVE SURFACE WITH HIGH SELECTIVITY BASE ON SLOT COUPLING
摘要： A Ku-band bandpass frequency selective surface (FSS) with high selectivity and miniaturization is proposed in this paper. We use two metallic strips and one slot to design the frequency selective surface structure which contains both electrical and magnetic couplings. A metallic via is introduced in the FSS element for miniaturization. With the via inserted at the end of the metallic strip, the FSS unit size is reduced to half compared to that without via inserted. To investigate the operating principle of the slot-coupled FSS, an equivalent-circuit model is given and analysed using the odd- and even-mode method. The constructed out-of-phase signal path causes two transmission zeros (TZs) near the skirts of the narrow pass band, thereby enhancing the selectivity. A prototype of the proposed FSS operating at 16 GHz is fabricated and measured. The measured results agree well with the full-wave and circuit simulation results, thus verifying the FSS design.
关键词： slot coupling,Ku-band,bandpass frequency selective surface,metallic via,high selectivity,equivalent-circuit model,transmission zeros,miniaturization
更新于2025-09-09 09:28:46
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - TCM-based Miniaturization Progress of a Square Microstrip Patch Antenna
摘要： A miniaturized square microstrip patch antenna (MPA) is analyzed and designed using the theory of characteristic mode (TCM). The TCM is applied to investigate and adjust the current distribution of the lowest resonance mode that the square patch can support. Based on the current distribution of the concerned mode, the two opposite edges of the patch where the characteristic current mainly concentrates on are curved with quadratic function curves. Then stubs are periodically loaded on the curved-edges, and the current along the curved-edges occurs slight changes. At last, two apertures are etched on the patch, and more current trends to flow along the edges of the apertures. The above three approaches are examined through TCM, and all lead to reduction of resonance frequency of concerned mode. After optimizing the position of the probe-fed, a 60% miniaturization in the size of the square MPA is achieved. The TCM is expected to provide more effective guidance in antenna miniaturization design.
关键词： theory of characteristic mode (TCM),square microstrip patch antenna (MPA),miniaturization
更新于2025-09-04 15:30:14
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Miniaturized Switchless Pattern Reconfigurable Antenna Utilizing Spherical Modes Analysis
摘要： The paper proposes an electrically small pattern reconfigurable antenna, which allows flexible beamforming with the antenna diameter being λ/5. The antenna has 3 ports, each designed to radiate a different spherical mode. By applying appropriate phase shift the antenna allows to flexibly sweep its bi-directional radiation pattern across a 360° azimuth, while offering 5 dBi directivity.
关键词： electrically small antenna,beamsteering,spherical modes,antenna miniaturization,antenna
更新于2025-09-04 15:30:14
-
[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Miniaturized Spoof Surface Plasmon Polaritons Transmission Line
摘要： Based on via arrays, a novel miniaturized spoof surface plasmon polaritons (SSPPs) transmission line (TL) with enhanced slow wave effect is proposed in this paper. The proposed miniaturized SSPPs TL is a bilateral metal structure connected by via arrays, composed of a pair of low impedance slotlines, a pair of flaring transitions and a section of corrugated metal strip. Excited by low impedance slotline, the bilateral structure transmits SSPPs from 2 GHz to 10 GHz and obtains a strong slow wave effect. In this paper, the designed structure and sample fabrication are presented. Simulated and measured S-parameters match well. High transmission efficiency and the enhanced slow wave effect are obtained. Moreover, the proposed structure halves the size compared to conventional planar SSPPs TLs excited by coplanar waveguide. These features give important potentials to develop integrated SSPPs devices and slow wave circuits.
关键词： periodic structures,surface waves,miniaturization
更新于2025-09-04 15:30:14
-
Miniaturized high-frequency sine wave gating InGaAs/InP single-photon detector
摘要： High-frequency gating InGaAs/InP single-photon detectors (SPDs) are widely used for applications requiring single-photon detection in the near-infrared region such as quantum key distribution. Reducing SPD size is highly desired for practical use, which is favorable to the implementation of further system integration. Here we present, to the best of our knowledge, the most compact high-frequency sine wave gating (SWG) InGaAs/InP SPD. We design and fabricate an InGaAs/InP single-photon avalanche diode (SPAD) with optimized semiconductor structure and then encapsulate the SPAD chip and a mini-thermoelectric cooler inside a butter?y package with a size of 12.5 mm × 22 mm × 10 mm. Moreover, we implement a monolithic readout circuit for the SWG SPD in order to replace the quenching electronics that is previously designed with board-level integration. Finally, the components of SPAD, the monolithic readout circuit, and the af?liated circuits are integrated into a single module with a size of 13 cm × 8 cm × 4 cm. Compared with the 1.25 GHz SWG InGaAs/InP SPD module (25 cm × 10 cm × 33 cm) designed in 2012, the volume of our miniaturized SPD is reduced by 95%. After the characterization, the SPD exhibits excellent performance with a photon detection ef?ciency of 30%, a dark count rate of 2.0 kcps, and an afterpulse probability of 8.8% under the conditions of 1.25 GHz gating rate, 100 ns hold-off time, and 243 K. Also, we perform the stability test over one week, and the results show the high reliability of the miniaturized SPD module.
关键词： InGaAs/InP,quantum key distribution,single-photon detector,miniaturization,sine wave gating
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO) - Mauritius (2018.10.15-2018.10.18)] 2018 IEEE Radio and Antenna Days of the Indian Ocean (RADIO) - Five-Stub Directional Device with Substantially Reduced Overall Dimensions
摘要： In this paper, a compact design of a five-stub microstrip coupler with significantly reduced overall dimensions has been investigated. To reduce the size, an artificial transmission line was used, with equivalent characteristics at a central operating frequency of 1000 MHz and in its vicinity, with the characteristics of an even-wave-length segment. Using the program of electrodynamic modeling AWR DE, a standard and compact coupler design was simulated. Due to the fact that the artificial line is shorter and the protruding elements are located, so that to maximally use the free space of the coupler without crossing with neighboring conductive lines from other lines, it was possible to reduce the area of the traditional coupler by 70% in relation to the area of the standard design, while the reduction in the band of operating frequencies occurred by 10%.
关键词： five-stub coupler,microstrip coupler,AWR DE,miniaturization,artificial transmission line
更新于2025-09-04 15:30:14