Microstrip antennas are of significant interest and extensively utilized in communication systems because of their unique low profile.However,the general difficulty in microstrip antenna design lies in its wideband el...Microstrip antennas are of significant interest and extensively utilized in communication systems because of their unique low profile.However,the general difficulty in microstrip antenna design lies in its wideband electromagnetic radiation within a low-profile structure.To enhance the bandwidth,superposing the fundamental mode and other high-order modes is the most common method,but this occupies a larger footprint than regular narrow-band modes.Here,as a counterintuitive way to broaden the bandwidth,a wideband miniaturized microstrip antenna is proposed by using two high-order modes.The avoidance of the fundamental mode allows for footprint miniaturization without decreasing the bandwidth,providing a different but feasible design strategy for wideband microstrip antennas.Compared with other microstrip antennas at the same profile,the proposed antenna achieves wider bandwidth and a smaller footprint.The experimental result shows a bandwidth of 4.81–6.01 GHz is achieved with a volume of 0.47×0.47×0.043 λ_(0)^(3),whereλ0 represents the in-vacuum wavelength at the center frequency.Therefore,the proposed design provides an effective solution to the intrinsic contradiction between wideband electromagnetic radiation and compact antenna dimensions,not only in a low profile but in a small footprint,contributing to the fundamental development of microstrip antennas.展开更多
There is a continuous demand to reduce the size of the devices that form a unit circuit,such as logic gates and memory,to reduce their footprint and increase device integration.In order to achieve a highly efficient c...There is a continuous demand to reduce the size of the devices that form a unit circuit,such as logic gates and memory,to reduce their footprint and increase device integration.In order to achieve a highly efficient circuit architecture,optimizations need to be made in terms of device processing.However,the time involved in the current reduction of device sizes according to Moore's Law has slowed down.Here,we propose a flexible transistor with ultra-thin IGZO(InGaZnO,indium-gallium-zinc-oxide)as the channel material,which not only scales down the footprints of multi-transistor logic gates but also combines the functions of the logic gates,memory,and sensors into a single cell.The transistor proposed here has an ultrathin semiconductor layer and can implement the typical functions of logic gates that conventionally have 2-6 transistors.Furthermore,it demonstrates the memory effect with a programming time as low as 5 ns.This design can also display various artificial synaptic behaviors.This new device design and structure can be adopted for the development of next-generation flexible electronics that require higher integration.展开更多
In this paper, the response time of all-optical AND logic gate using the triangular photonic crystal lattice is investigated. The proposed logic gate consists of a photonic crystal nano-resonator formed by changing th...In this paper, the response time of all-optical AND logic gate using the triangular photonic crystal lattice is investigated. The proposed logic gate consists of a photonic crystal nano-resonator formed by changing the size of the dielectric rods. The structure benefits the interference effect mechanism. The contrast ratio of the photonic crystal AND logic gate is obtained as 6 d B. In addition to simplicity, the designed nano-resonator increases the bit rate of logic gate. The delay time and footprint of logic gate are respectively 0.32 ps and 146 μm2. The proposed photonic crystal AND logic gate can operate at a bit rate of 3.12 Tbit/s。展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.U22B2016 and 62022045)the National Key Research and Development Program of China(Grant No.2021YFA0716600)the Shenzhen Science and Technology Program(Grant No.JSGG20210802153800002).
文摘Microstrip antennas are of significant interest and extensively utilized in communication systems because of their unique low profile.However,the general difficulty in microstrip antenna design lies in its wideband electromagnetic radiation within a low-profile structure.To enhance the bandwidth,superposing the fundamental mode and other high-order modes is the most common method,but this occupies a larger footprint than regular narrow-band modes.Here,as a counterintuitive way to broaden the bandwidth,a wideband miniaturized microstrip antenna is proposed by using two high-order modes.The avoidance of the fundamental mode allows for footprint miniaturization without decreasing the bandwidth,providing a different but feasible design strategy for wideband microstrip antennas.Compared with other microstrip antennas at the same profile,the proposed antenna achieves wider bandwidth and a smaller footprint.The experimental result shows a bandwidth of 4.81–6.01 GHz is achieved with a volume of 0.47×0.47×0.043 λ_(0)^(3),whereλ0 represents the in-vacuum wavelength at the center frequency.Therefore,the proposed design provides an effective solution to the intrinsic contradiction between wideband electromagnetic radiation and compact antenna dimensions,not only in a low profile but in a small footprint,contributing to the fundamental development of microstrip antennas.
基金the National Natural Science Foundation of China(No.61574147)Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholar(No.LR17F040002)+1 种基金Ningbo Natural Science Foundation of China(No.2018A610003)Instrument Developing Project of the Chinese Academy of Sciences(No.YJKYYQ20180021).We would like to thank Editage(www.editage.com)for their English language and editing support.
文摘There is a continuous demand to reduce the size of the devices that form a unit circuit,such as logic gates and memory,to reduce their footprint and increase device integration.In order to achieve a highly efficient circuit architecture,optimizations need to be made in terms of device processing.However,the time involved in the current reduction of device sizes according to Moore's Law has slowed down.Here,we propose a flexible transistor with ultra-thin IGZO(InGaZnO,indium-gallium-zinc-oxide)as the channel material,which not only scales down the footprints of multi-transistor logic gates but also combines the functions of the logic gates,memory,and sensors into a single cell.The transistor proposed here has an ultrathin semiconductor layer and can implement the typical functions of logic gates that conventionally have 2-6 transistors.Furthermore,it demonstrates the memory effect with a programming time as low as 5 ns.This design can also display various artificial synaptic behaviors.This new device design and structure can be adopted for the development of next-generation flexible electronics that require higher integration.
文摘In this paper, the response time of all-optical AND logic gate using the triangular photonic crystal lattice is investigated. The proposed logic gate consists of a photonic crystal nano-resonator formed by changing the size of the dielectric rods. The structure benefits the interference effect mechanism. The contrast ratio of the photonic crystal AND logic gate is obtained as 6 d B. In addition to simplicity, the designed nano-resonator increases the bit rate of logic gate. The delay time and footprint of logic gate are respectively 0.32 ps and 146 μm2. The proposed photonic crystal AND logic gate can operate at a bit rate of 3.12 Tbit/s。
