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Proceedings ArticleDOI

A Superstrate Loaded High Gain Circularly Polarized Slotted Waveguide Array

TL;DR: In this article, a superstrate loaded slotted waveguide is proposed, where a polarizer superstrate is kept at an optimized distance above the slot aperture, and the presented antenna resonates at 9.32 GHz.
Abstract: In this paper, a Superstrate loaded slotted waveguide is proposed. A polarizer superstrate is kept at an optimized distance above the slot aperture. The analysis and optimization has been done by CST Microwave studio 14.0. The presented antenna resonates at 9.32 GHz. The gain of designed antenna has been achieved up to 8.1dBi. The presented slotted waveguide array is reconfigured to LHCP by rotating the polarized superstrate layer by 90°.
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Journal ArticleDOI
TL;DR: In this article, a planar polarization-reconfigurable metasurface antenna (PRMS) is proposed to operate at around 3.5 GHz with high-polarization isolation of larger than 15 dB.
Abstract: A planar polarization-reconfigurable metasurfaced antenna (PRMS) designed using metasurface (MS) is proposed. The PRMS antenna consists of a planar MS placed atop of and in direct contact with a planar slot antenna, both having a circular shape with a diameter of 78 mm (0.9 $\lambda_{0}$ ), making it compact and low profile. By rotating the MS around the center with respect to the slot antenna, the PRMS antenna can be reconfigured to linear polarization, left-hand and right-hand circular polarizations. An equivalent circuit is used to explain the reconfigurability of the antenna. The PRMS antenna is studied and designed to operate at around 3.5 GHz using computer simulation. For verification of simulation results, the PRMS antenna is fabricated and measured. The antenna performance, in terms of polarization reconfigurability, axial-ratio bandwidth, impedance bandwidth, realized boresight gain and radiation pattern, is presented. Results show that the PRMS antenna in circular polarizations achieves an operating bandwidth of 3.3–3.7 GHz (i.e., fractional bandwidth 11.4%), a boresight gain of above 5 dBi and high-polarization isolation of larger than 15 dB. While the PRMS antenna in linear polarization achieves a gain of above 7.5 dBi with cross-polarization isolation larger than 50 dB.

272 citations

Journal ArticleDOI
TL;DR: In this article, an analysis of the characteristics of a broad wall radiating slot, offset from the center line and tilted with respect to the longitudinal axis of a rectangular waveguide, is presented.
Abstract: An analysis is presented of the characteristics of a broad wall radiating slot, offset from the center line and tilted with respect to the longitudinal axis of a rectangular waveguide. Pertinent integral equations are developed, taking into account finite wall thickness, and are solved for the slot aperture E-field using the method of moments. Compound slot characteristics are then deduced, including resonant length and dominant mode scattering. Numerical results for the scattering from resonant slots are presented over a range of offsets, tilt angles, frequencies and waveguide dimensions. For resonant compound slots, offset and tilt are shown to control the aperture electric-field amplitude with a phase variability of 360 degrees . The results have significant applications in the design of compound slot arrays. >

129 citations


"A Superstrate Loaded High Gain Circ..." refers background in this paper

  • ...Then after different types of slots like cross slots, compound slots, L-type had been cut on the broad wall and narrow wall of waveguide to generate the circular polarization [2-4]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a waveguide slot configuration is proposed to radiate a circular polarization with a very low axial ratio, which is mainly intended as a circularly polarized radiating element to be used in an array.
Abstract: We present a new waveguide slot configuration able to radiate a circular polarization with a very low axial ratio. This configuration is mainly intended as a circularly polarized radiating element to be used in an array. Both left-hand and right-hand circular polarization can be independently obtained and therefore this configuration could be used to realize a polarization agile antenna. The proposed configuration consists of two very closely spaced radiating slots, so a specialized method of moments code has been developed to analyze, in a very effective way, the near-field interaction between such slots. Our method of moments code has been validated against a commercial finite-element method code, and then used to design a number of different circularly polarized radiating elements.

82 citations


"A Superstrate Loaded High Gain Circ..." refers background in this paper

  • ...Next year in 2004, the author [6] extended their work on polarization agile waveguide slot antenna....

    [...]

Journal Article

30 citations


"A Superstrate Loaded High Gain Circ..." refers background in this paper

  • ...Then after different types of slots like cross slots, compound slots, L-type had been cut on the broad wall and narrow wall of waveguide to generate the circular polarization [2-4]....

    [...]

Journal ArticleDOI
TL;DR: For the particular case of a circularly polarized linear waveguide array using crossed-slot radiators, in addition to solving the grating lobe problem, it was shown that the use of corrugated guide offers appreciable bandwidth advantages as discussed by the authors.
Abstract: For the particular case of a circularly polarized linear waveguide array using crossed-slot radiators, in addition to solving the grating lobe problem, it is shown that the use of corrugated guide offers appreciable bandwidth advantages.

13 citations


"A Superstrate Loaded High Gain Circ..." refers background in this paper

  • ...Sangster [1] was proposed circularly polarized slotted waveguide array....

    [...]