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We have studied a high impedance antenna in order to improve the rectifier efficiency for energy harvesting applications. Folded dipole antenna (FDA) with high impedance of over 10 kΩ is proposed. To obtain higher impedance stepup ratio compared with the conventional FDA, an FDA consisting with three strip conductors is investigated. Impedance stepup ratio is calculated and the results in theory,...
The planar dipole antenna and planar inverted L antenna with built-in CPW are proposed and numerically analyzed. The characteristics of proposed antenna is compared with that of the conventional offset fed antenna. By installing the CPW within antenna element, the radiation characteristics and input impedance are independently determined.
A new type of broadband miniature antenna consists of helical dipole folded by central conductor is presented in this paper. Besides a brief analysis, the experimental results show the good performances of wider bandwidth (25%–40%), higher input impedance(about 200 Ohms), and flexible for designing, it is suitable to be used as both mobile vertical antenna and excitor of Yagi antenna.
A simple measurement method for the balanced and unbalanced modal power ratios of a small antenna is proposed. Because the conductance corresponding to each mode can be calculated by applying the S-parameter method to the power dissipated at the antenna, the modal power ratio can be obtained by measuring only the 2-port S-parameters. In this paper, we demonstrate a simulation for the analysis of the...
Folded spiral antenna for wireless power transfer (WPT) is prosed. In order to realize maximum available efficiency, impedance matching should be achieved. It is known that the folded dipole antennas has a capability of adjusting input impedance by using two conductors with different diameters. The folded spiral antenna proposed in this report is based on self-resonant spiral antenna, that has folded...
In this work we propose that the dipole antenna can be fed directly through the coaxial cable, without any balun, when used with a perfect electric conductor (PEC) reflector placed at quarter wavelength distance. This configuration leads to a high impedance between the coaxial cable outer metal shield at the dipole feed point and the ground plane which restricts the current to flow on the outer metal...
Various domestic appliances that can use WiFi are becoming more common. Therefore, it is necessary to establish a design method for installing a small antenna within these appliances. In this paper, a model that has a dipole antenna unified with an artificial magnetic conductor (AMC) substrate inspired small antenna is proposed, and its radiation and impedance characteristics are shown.
This paper presents a low profile wideband diamond dipole antenna backed with an Artificial Magnetic Conductor. The paper addresses the problem of drop in the broadside gain due to the split in the radiation pattern at some particular frequencies within the operation bandwidth. A solution is proposed by using a hybrid Artificial Magnetic Conductor that can effectively cancel this effect. The resulting...
Folded dipoles are typically used as elements in curtain arrays due to their high input impedance, but under this configuration, the bandwidth of the curtain array in antenna mode is limited. This paper proposes an improved folded dipole based on a branch model, which effectively increases the bandwidth of the input impedance and decreases the VSWR(Voltage Standing-Wave Ratio) by selecting appropriate...
In this paper we present a medium frequency (MF) band helical dipole antenna for borehole application. The proposed antenna is loaded with a ferrite-bundle and is optimized to achieve an ultra-compact size to fit within a volume of λ0/1337 × λ0/1337 × λ0/80 while maintaining a relatively high efficiency. To feed the antenna from the center using an external source, the effect of a metallic cylinder...
The cosmic Dark Ages, the period between the formation of the cosmic microwave background radiation and the formation of the first stars, is a critical stage in the evolution of our universe. During this period, the intergalactic medium consisted almost entirely of neutral Hydrogen, and consequently one of the only ways to study this epoch is through the highly redshifted 21-cm spectral line of Hydrogen...
A meandered slot antenna is proposed without matching network. For size reduction, the meander-line configuration combined with slot dipole antenna was applied in tag antenna. Also, effects of the conductor area on the performance of the antenna are investigated for tag impedance matching. The proposed design is verified by simulation and measurement which show good agreement. The measured bandwidth...
We present a metamaterial substrate designed to act as a high impedance thin slab that can be used to integrated low-profile (subwavelength thickness) antennas in components or packages. A transverse equivalent network (TEN) model accurately describing the reflection properties of the impedance substrate is also provided to facilitate its design. Then, we develop a low profile planar antenna consisting...
We present a lumped circuit description of a novel metamaterial layer made of arrayed pairs of tightly coupled conductors (dogbones or Jerusalem crosses). This lumped element network is synthesized to exhibit the same frequency response of the metamaterial layer when inserted in the plane-wave equivalent transmission line. The metamaterial and its transverse equivalent network (TEN) model is then...
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