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In this paper, the anisotropic conductivity dispersion of horizontally aligned multi-walled carbon-nanotube (HA-MWCNT) thin films on a kapton substrate are characterized at microwave range. It is well known that a single carbon nanotube (CNT) presents highly 1-D conduction. For a thin film composed of numerous aligned CNTs, the anisotropic conduction may be preserved to some extent, as this is useful...
A novel substrate integrated waveguide (SIW) slot antenna with high power-handling capacity in X band is proposed. The whole slot array antennas are designed on a single substrate, which takes the advantage of small size, low cost, and easy integration. The design process and simulated results of the slot array antennas are presented. The simulated results demonstrate that the presented novel SIW...
The design of a circularly polarized (CP) microstrip antenna with wide beamwidth working at 1.268GHz is proposed. The wide beamwidth is achieved by introducing a substrate larger than the ground and an annular dielectric superstrate with a metal ring. The effects of the substrate, superstrate and ring on radiation pattern and circular polarization are discussed. Simulation results show the proposed...
Firstly, a novel slow-wave microstrip structure (SWMS) is proposed, which is composed of two-layer metamaterial. Then, a high gain compact resonant antenna based on the present SWMS is designed, fabricated, simulated and measured. The length, width and height of the proposed antenna are only 1/9 λ0, 1/9 λ0, and 1/36 λ0, respectively. The patch area of proposed antenna is only 14.6% of a conventional...
A wide beamwidth circularly polarized microstrip antenna is presented, which is composed of multi-layers and fed through a single coax probe. Proper perturbation is introduced by two truncated corner on the patch to generate a circularly polarized wave. Meanwhile, plated-through pins to the ground, connected by the square ring, are used to realize the wide beamwidth radiation. Finally, an antenna...
In this paper, the effects of parameters of substrate and ILH-MSA structure on radiation performances have been analyzed firstly, and then the available ranges of the parameters are given to ensure radiation performances of ILH-MSA. Secondly, an ILH-MSA operating at 1.6GHz is designed and fabricated as an example. Experiment results show that, the area of the present ILH-MSA is 49% of that of traditional...
Based on the theoretical analysis of microstrip antenna (MSA) loaded with a shorting-pin, a novel MSA with broad beamwidth is proposed. In the structure, multiple layers are used to achieve high radiation efficiency, while a conducting cylinder and a coupling aperture are applied to excite multiple modes to obtain broad beamwidth. Finally, a novel MSA is designed and fabricated as an example. The...
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