Miniaturization of GPS patch antennas based on novel dielectric ceramics Zn(1-x)MgxAl2O4 by sol-gel method

Huda Abdullah, Wan Nasarudin Wan Jalal, Mohd Syafiq Zulfakar

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The need for miniaturization and weight reduction of GPS patch antennas has prompted the search for new microwave dielectric materials. In this study, a sol-gel method was used to prepare Zn(1-x)MgxAl 2O4 thin films and fabricate GPS patch antennas at a low annealing temperature (700 C). X-ray diffraction (XRD) patterns, field emission scanning electron microscopy images, Fourier transform infrared spectra, and optical band gap analyses confirmed the nanostructure of (Mg/Zn)Al 2O4. The XRD patterns displayed the characteristic peaks of (Mg/Zn)Al2O4 with a face-centered cubic structure. Mg addition decreased the crystallite size, surface morphology, and lattice parameters of the resultant films, evidently affecting their density and dielectric constant (E r ). Based on the material investigated and microwave antenna theory, GPS patch antennas were fabricated using Zn (1-x)MgxAl2O4 and then studied using a PNA series network analyzer. The fabricated patch antennas with different E r ceramics decreased in size from 12.5 to 10.8 cm2. The patch antennas resonated at a frequency of 1.570 GHz and provided a return loss bandwidth between -16.6 and -20.0 dB; their bandwidth also improved from 90 to 255 MHz. The GPS patch antenna fabricated from Zn0.70Mg 0.30Al2O4 showed an excellent combination of return loss (-20.0 dB), small size (10.8 cm2), and wide bandwidth (255 MHz). Therefore, addition of Mg improves antenna performance and decreases the dimensions of the device.

Original languageEnglish
Pages (from-to)429-440
Number of pages12
JournalJournal of Sol-Gel Science and Technology
Volume69
Issue number2
DOIs
Publication statusPublished - Feb 2014

Fingerprint

patch antennas
miniaturization
Microstrip antennas
Sol-gel process
Global positioning system
gels
ceramics
bandwidth
Bandwidth
Diffraction patterns
diffraction patterns
antennas
microwave antennas
Microwave antennas
weight reduction
X ray diffraction
Electric network analyzers
Optical band gaps
Crystallite size
Field emission

Keywords

  • Dielectric constant
  • Mg-Zn-AlO
  • Patch antennas
  • Sol-gel method

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Biomaterials
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Miniaturization of GPS patch antennas based on novel dielectric ceramics Zn(1-x)MgxAl2O4 by sol-gel method. / Abdullah, Huda; Jalal, Wan Nasarudin Wan; Zulfakar, Mohd Syafiq.

In: Journal of Sol-Gel Science and Technology, Vol. 69, No. 2, 02.2014, p. 429-440.

Research output: Contribution to journalArticle

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