Journal ArticleDOI
Bandwidth Enhancement of Miniaturized Slot Antennas Using Folded, Complementary, and Self-Complementary Realizations
R. Azadegan,Kamal Sarabandi +1 more
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TLDR
In this paper, a self-complementary structure of the same miniaturized topology was proposed to moderate the frequency dependence of the antenna input impedance. But, the authors only evaluated the effect of the self-compensated structure on the performance of the folded slot antenna.Abstract:
Folded and self-complementary structures are considered as two effective approaches to increase the bandwidth of miniaturized antennas. A folded realization of a previously reported miniaturized slot antenna is devised and shown to provide more than 100% increase in the bandwidth as compared with that of the miniaturized slot antenna with the same size and efficiency. The complementary pair of the miniaturized folded slot, namely, the folded printed wire is also discussed in this paper. It is shown that the folded slot has a much higher radiation efficiency when compared with its complementary folded wire antenna. Another approach for bandwidth improvement is the implementation of the self-complementary structure of the same miniaturized topology to moderate the frequency dependence of the antenna input impedance. To examine this approach, a folded self-complementary miniature antenna is studied, where further increase in bandwidth is observed. A miniaturized folded slot, its complementary miniaturized folded printed wire, as well as their self-complementary realization, were fabricated and tested. These antennas can fit into a very small rectangular area with dimensions as small as 0.065lambdao x 0.065lambdao. While the folded slot ranks the highest in the efficiency/gain, the self-complementary structure falls between the slot and printed wire since it consists of equal proportions of the both slots and strips. A self-complementary H-shape antenna is also introduced to demonstrate that by relaxing the miniaturization to a moderate value, a significant improvement in bandwidth can be accomplished. With yet small dimensions of 0.13lambdao x 0.24lambdao, a very wide bandwidth of (2.3:1) is obtained. For the case of no dielectric substrate, even wider bandwidth of (3:1) is achievable.read more
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Journal ArticleDOI
Experimental Validation of Performance Limits and Design Guidelines for Small Antennas
Daniel F. Sievenpiper,David Carlos Dawson,Minu M. Jacob,Tumay Kanar,Sanghoon Kim,Jiang Long,Ryan Quarfoth +6 more
TL;DR: In this article, the theoretical performance limit for small antenna performance has been validated by all available experimental evidence and the theoretical predictions for the performance due to design factors such as permittivity, aspect ratio, and the internal structure of the antenna are also supported by the experimental evidence.
Journal ArticleDOI
A Survey and Study of Planar Antennas for Pico-Satellites
TL;DR: This paper reviews 66 planar antenna designs, which includes 38-patch and 28-slot antennas, and provides an extensive qualitative comparison of these antennas in terms of their mass, size, gain, beam steerability, type of polarization, operating frequency band, and return loss.
Journal ArticleDOI
Miniaturization of Slot Antennas Using Slit and Strip Loading
TL;DR: In this article, a miniaturized slot antenna with slit loading fed by the CPW line is proposed, where the loading slits can be located only on the feed side without degradation in cross-pol performance, unlike the microstrip-fed case.
Journal ArticleDOI
Slot Antenna Miniaturization Using Slit, Strip, and Loop Loading Techniques
TL;DR: In this paper, the design of a miniaturized slot antenna fed by microstrip line is proposed based on loop, slit, and strip loading techniques, and the antenna topologies considered are different combination of loops, slits, and strips on top and bottom of the substrate.
References
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Journal ArticleDOI
Physical Limitations of Omni-Directional Antennas
TL;DR: In this paper, the physical limitations of omni-directional antennas are considered and the potentiality of a broad band width of an antenna with the maximum dimension of 2a has been shown.
Journal ArticleDOI
Fundamental Limitations of Small Antennas
TL;DR: In this paper, a simple formula for the more fundamental properties of small antennas and their behavior in a simple circuit is given for 1-Mc operation in typical circuits, which indicates a loss of about 35 db for the I.R.E. standard capacitive antenna, 43 db for a large loop occupying a volume of 1 meter square by 0.5 meter axial length, and 64 db for an antenna loop of 1/5 these dimensions.
Journal ArticleDOI
Effect of antenna size on gain, bandwidth, and efficiency
TL;DR: It is found that the maximum gain obtainable from a broad-band antenna is approxima tely equal t o that of the uniformly Illuminated aperture, and if higher gain is desired, the antenna mus t necessarily be a narrow-band device.
Journal ArticleDOI
Fundamental limitations in antennas
TL;DR: In this article, four fundamental limitations in antennas have been identified in the areas of: electrically small antennas, super-directive antenna, superresolution antennas, and high-pin antennas.
Journal ArticleDOI
Evaluation of antenna Q
R. Collin,S. Rothschild +1 more
TL;DR: In this paper, a method is presented for evaluating the Q of an antenna, where the Q is defined as in conventional network theory, and the method consists of subtracting the energy density associated with the power flow from the total energy density, thus enabling the magnetic and electric reactive energy to be computed.