Article

Dual‐band circular slot antenna design for circularly and linearly polarized operations

Microwave and Optical Technology Letters (Impact Factor: 0.62). 12/2010; 52(12):2717 - 2721. DOI: 10.1002/mop.25562

ABSTRACT The dual-band circular slot antenna utilizing the embedded arc-shaped metallic strip for the circularly polarized (CP) and linearly polarized (LP) operations is presented in this letter. The experimental results show that the resonant frequency of low-band for CP mode is utilized the protruded arc-shaped metallic strip, which extends current route to make the fundamental resonant mode shifted to the lower frequency band. The high-band for LP mode, which has the similar current distribution to that of the fundamental mode of the conventional circular slot, is employed the first-higher order resonant mode of the circular slot. Two measured input impedance bandwidths of the proposed design are 23.2% and 18.8%, respectively, and the measured bandwidth of low-band with an axial ratio (AR) of less than 3.0 dB is 14.5%. The operating bands show the broadside radiation patterns with 1.7–2.7 dBic CP gain and the peak antenna gain of 3.6–4.3 dBi, respectively. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2717–2721, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25562

0 Followers
 · 
81 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: AbstractA microstrip‐to‐slotline transition technique is presented, for the coupling of a circularly polarized circular slot antenna in the ultrahigh frequency band.The fundamental TE11 mode of the circular slot antenna is investigated, using the magnetic current flow in the slot. In the proposed design, circular polarization (CP) is generated using a proper c‐strip metal, within the circular slot structure, and connecting a strip metal to the circular slot edge, at −45° to the feeding slotline. The direct slotline feed is coupled to a 50‐Ω microstrip line, on the opposite side of the substrate. Simulated and measured results indicate that the proposed structure achieves good CP radiation, in the TE11 mode. The impedance bandwidth and the 3‐dB axial‐ratio bandwidth for the design are approximately 22.1% and 2.5%, respectively. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2016–2023, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27013
    Microwave and Optical Technology Letters 09/2012; 54(9). DOI:10.1002/mop.27013 · 0.62 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: This article describes the implementation of a broadband circularly polarized (CP) antenna array for switched beam applications. The antenna comprises of four identical CP slot elements in a 2 × 2 configuration that uses a 4 × 4 feeding network. Each CP slot element in the array is sequentially rotated with respect to each other to enhance the antenna's axial-ratio (AR) bandwidth. Measured results confirm the array exhibits an impedance bandwidth of 2.25 GHz that extends over the frequency range 4.6–6.85 GHz (∼40%) for S11 ≤ −10 dB, and 3 dB AR bandwidth of 1.7 GHz that extends between 4.8–6.5 GHz (∼30%). The antenna's gain is in excess of 6.8 dBi between 5–6 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2813–2817, 2014
    Microwave and Optical Technology Letters 12/2014; 56(12). DOI:10.1002/mop.28707 · 0.62 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: AbstractA DC–20‐GHz broadband and compact single‐pole‐quadruple‐throw (SPQT) switch for Butler matrix switched beam smart antenna system application has been designed and fabricated on 0.15‐μm GaAs pHEMT process. By adopting inductive high impedance transmission lines in series‐shunt switch topology, the SPQT switch demonstrates an insertion loss of 1.25–3.53 dB from DC to 20 GHz, and the isolation is higher than 22 dB with a compact chip size of 1.5 mm2. The measured output 1 dB compression point (OP1 dB ) is 16 dBm at 12 GHz. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2023–2026, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26993
    Microwave and Optical Technology Letters 09/2012; 54(9). DOI:10.1002/mop.26993 · 0.62 Impact Factor