CAD of mechanically tunable rectangular microstrip patch with variable aspect ratio
01 Dec 2007-pp 1-3
TL;DR: The effect of aspect ratio of rectangular microstrip patch on its input impedance is demonstrated and computed results have been verified with own experiments and simulated data showing very close agreement amongst them.
Abstract: An improved CAD formulation is proposed to determine accurate input impedance of rectangular microstrip patches with variable aspect ratio. This paper demonstrate the effect of aspect ratio of rectangular microstrip patch on its input impedance. The computed results have been verified with our own experiments and simulated data showing very close agreement amongst them.
Citations
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TL;DR: In this paper, the bandwidth and efficiency of a rectangular-patch antenna using the High-Frequency Structure Simulator (HFSS) was investigated and the antenna performance was further enhanced by inserting single and double slot designs into the patch.
Abstract: The microstrip patch antenna is used in various communication applications including cellular phones, satellites, missiles, and radars, due to its several attractive features such as small size and weight, low cost, and easy fabrication. The microstrip patch antenna consists of a top radiating patch, a bottom ground plane, and a dielectric substrate in between. The patch can have different shapes, the rectangular patch being the most commonly used. In practice, the microstrip antenna suffers from narrow bandwidth and low gain efficiency. This paper aims to enhance the bandwidth and efficiency of a rectangular-patch antenna using the High-Frequency Structure Simulator (HFSS). Initially different patch sizes and substrate materials are investigated and optimal antenna parameters are achieved. Then, the antenna performance is further enhanced by inserting single and double slot designs into the patch. Two cost-effective feeding methods are involved in the investigation. The antenna is designed to operate in the Super High Frequency (SHF) band.
6Â citations
Cites background from "CAD of mechanically tunable rectang..."
...However, the rectangular patch is the most common antenna geometry which has been extensively investigated [4]....
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TL;DR: In this article, the authors proposed to enhance the bandwidth of a microstrip antenna or introduce more resonant frequencies within the Super High Frequency (SHF) band using the High Frequency Structure Simulator (HFSS).
Abstract: Microstrip patch antenna is attractive for various applications due to its easy fabrication, low cost andsmall size. It simply comprises of a radiating patch and ground plane that are separated by a dielectricsubstrate. However, the resonance bandwidth of the microstrip antenna is still an issue that needs to beconsidered in research. This paper aims to enhance the bandwidth of a microstrip antenna or introducemore resonant frequencies within the Super High Frequency (SHF) band. The paper demonstratesempirical results for circular-shaped patch antenna using the High Frequency Structure Simulator(HFSS). It begins by investigating different patch sizes and substrate materials, so that an optimalpreliminary design is introduced. Then, different slot shapes are inserted into the patch for significantenhancement of the resonance characteristics. As a result, new ultra-wideband (UWB) antenna designsare presented with bandwidth results reaching 15.5 GHz within the C, X, Ku and K bands. Also, newmultiband antenna designs are presented with improved reflection valleys in the Ku, K and Ka bands.
1Â citations
Cites background from "CAD of mechanically tunable rectang..."
...In fact, the rectangular shape is commonly used due to its simplicity, and thus it has been extensively investigated by researchers (Chattopadhyay et al., 2007)....
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References
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Book•
02 Jul 1997
TL;DR: Lee et al. as discussed by the authors used the Finite Difference Time Domain (FDTD) method to construct a probe-fed multilayer microstrip antenna. But their work focused on the design of the antenna.
Abstract: Probe-Fed Microstrip Antennas (K. Lee, et al.). Aperture-Coupled Multilayer Microstrip Antennas (K. Luk, et al.). Microstrip Arrays: Analysis, Design, and Applications (J. Huang & D. Pozar). Dual and Circularly Polarized Microstrip Antennas (P. Hall & J. Dahele). Computer-Aided Design of Rectangular Microstrip Antennas (D. Jackson, et al.). Multifunction Printed Antennas (J. James & G. Andrasic). Superconducting Microstrip Antennas (J. Williams, et al.). Active Microstrip Antennas (J. Navarro & K. Chang). Tapered Slot Antenna (R. Lee & R. Simons). Efficient Modeling of Microstrip Antennas Using the Finite-Difference Time-Domain Method (S. Chebolu, et al.). Analysis of Dielectric Resonator Antennas (K. Luk, et al.). References. Index.
419Â citations
"CAD of mechanically tunable rectang..." refers background in this paper
...,nm R(xo) is the input resistance at resonance for a feed located along the x-axis and can be obtained from [3] as I....
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01 Oct 1980
TL;DR: In this article, the authors found that for low dielectric substrate microstrip antennas, the critical parameter affecting the change in resonant frequency is the error in antenna length while for high permittivity substrates, the tolerance in dielectrics constant is the critical parameters.
Abstract: Deviations in effective electrical dimensions caused by slight variations in finished microstrip antenna length, variations in the relative permittivity of the substrate material or nonuniformity in the substrate thickness lead to discrepancies between the designed and actual resonant frequencies. This sort of discrepancy is especially significant because of the narrow bandwidth of such antennas. It is found that for low dielectric substrate microstrip antennas, the critical parameter affecting the change in resonant frequency is the error in antenna length while for high permittivity substrates, the tolerance in dielectric constant is the critical parameter.
166Â citations
"CAD of mechanically tunable rectang..." refers background in this paper
...and Zr is the characteristic impedance given by [6]...
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TL;DR: In this article, an improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps, which is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch.
Abstract: An improved analytical model is presented for calculating the resonant frequency of circular microstrip antennas with and without air gaps. Unlike the previous models, the present one is widely applicable to all patch diameters-from very large to very small compared to the height of the dielectric medium below the patch and also to the substrates covering the entire range of dielectric constants. The computed results for different antenna dimensions and modes of resonance are compared with the experimental values.
123Â citations
"CAD of mechanically tunable rectang..." refers methods in this paper
...In this paper, we propose another computer aided design (CAD) formula based on one recent CAD model reported for circular patch geometry in [1] for accurate estimation of input impedance of rectangular microstrip patch antenna with any length to width /aspect ratio....
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TL;DR: In this article, an improved cavity model called modified Wolff model (MWM) was proposed to compute the resonance frequency of a rectangular patch antenna on the thick PTFE substrate.
Abstract: We report an improved cavity model called modified Wolff model (MWM) to compute the resonance frequency of a rectangular patch antenna on the thick PTFE substrate (0.037/spl lambda//sub g/-0.229/spl lambda//sub g/). The MWM accounts for the effect of anisotropy and total losses on the resonance frequency, therefore it has a maximum deviation 2% against the experimental results. The previous cavity model, the multiport cavity model, and MOM based commercial software, Ensemble, compute resonance frequency with deviation between 4%-36%. Results on the bandwidth computed by these models have also been compared against the experimental results.
13Â citations
"CAD of mechanically tunable rectang..." refers methods in this paper
...The quality factor due to radiation loss (Qr) is calculated from [ 4 ]...
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