Dual-band Rectangular Microstrip Antenna Research Articles

Tunable and dual band rectangular microstrip antenna for bluetooth and WiMAX applications

ABSTRACTA rectangular microstrip antenna (RMSA) with two slots placed close and parallel to nonradiating edges for tunable and dual band operation with single feed has been demonstrated. A tunable operation can be achieved by the adding electrically small slots along the patch edges. For two frequencies TM10 and TM30 are the first two modes of simple RMSA are perturbed and two frequencies with same polarization, broadside radiation, and impedance characteristics. Dual frequency operations easily obtained if two slots placed together and are of same dimensions, which equals to greater than half of length. The proposed design is suitable for dual band operation for Bluetooth 2450 MHz–WiMAX 3500 MHz. Slot dimensions was taken identical for the symmetry. The performance parameters of the proposed RMSA with and without slots were compared. Furthermore, a parametric analysis carried out by taking variations in the length (Ls), width (d) and spacing (S) between the two slots, the frequency ratio is tuned in the range 1.41 to 1.45. The dimensions of the proposed antenna 50 × 54 × 1.6mm3 with the size reduction compared with conventional microstrip antenna (MSA).The proposed antenna is simulated using HFSS based on finite element method and simulated return loss, radiation pattern and impedance were presented. Finally fabrication and measurement of VSWR of the proposed antenna has been taken. The HFSS results and measured results are in good agreement. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1986–1991, 2015

Design of Dual Band Rectangular Microstrip Antenna with C-Shaped Defected Ground Structure

In this research paper, the design of C-shaped Defected Ground Structure (DGS) antenna is proposed to realize dualband characteristics for C-band and X-band applications. The proposed antenna consists of C-shaped slot incorporated in ground plane which resonates at two different frequencies (fr1 and fr2) of 7.41 GHz and 9.28 GHz which lie in C-band and X-band respectively. A very good return loss (S11) of -30.79 dB and -40.75 dB are obtained at first and second resonant frequencies respectively for C-shaped DGS antenna. The Bandwidth of C-shaped DGS antenna is increased by 825 MHz and 1182.8 MHz respectively at two different bands than the bandwidth of the Conventional Rectangular Microstrip Patch Antenna (CRMPA). Also VSWR is much improved with C-shaped DGS antenna. The comparison of simulated results of proposed and CRMPA has also been presented in this paper. The main contribution of this paper is the miniaturization of ground plane of 23% using C-shaped DGS which is very much encouraging. General Terms Bandwidth (B.W.), Return loss (S11), Voltage Standing Wave Ratio (VSWR), Peak Gain, Characteristic Impedance and Radiation Pattern.

Compact Dual-Band Microstrip Antenna for IEEE 802.11a WLAN Application

A compact dual-band rectangular microstrip antenna (RMSA) is realized by two different single-slotted single-band rectangular microstrip antennas with slotted ground plane. Each open-ended slot in the single-slotted antenna is responsible to generate a wide impedance band that is shifted to lower frequencies by the effect of the ground slot. The length and position of each open-ended slot is varied to operate the antenna in a suitable resonant band (5.15–5.35 and 5.725–5.825 GHz). The proposed antenna meets the required impedance bandwidth, necessary for dual-band IEEE 802.11a WLAN application (5.125–5.395 and 5.725–5.985 GHz). The dimension of the antenna (12 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\,\times\,$</tex></formula> 8 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\,\times\,$</tex></formula> 1.5875 mm <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$^{3}$</tex></formula> ) shows an average compactness of about 53.73% with respect to a conventional unslotted rectangular microstrip patch antenna.

Analysis of Slot Cut Broadband and Dual-band Rectangular Microstrip Antennas

The broadband and dual-band rectangular microstrip antenna is realized by cutting pair of toothbrush-shaped or step slots along the non-radiating edges of the patch. The toothbrush-shaped slot is said to introduce TMd0 mode in between the TM10 and TM20 modes of the rectangular patch and realizes broadband response. In step slot cut configuration, the slot introduces a mode near the TM10 mode resonance frequency of the patch and realizes dual frequencies. In this paper, a detail analysis to study the effect of slots on the broadband and dual-band response in these rectangular microstrip antennas (RMSAs) is presented. It was observed that the slot does not introduce any mode but modifies the resonance frequency of higher order orthogonal mode and realizes broadband and dual-band response. The slot alters the direction of surface currents at higher order mode and gives similar radiation pattern characteristics over the broader bandwidth and at the dual frequencies. In broadband RMSA, a formulation of resonant length at modified TM02 mode is proposed. The frequency calculated using the same closely agrees with the simulated result.

Analysis of slot cut broadband and dual-band rectangular microstrip antennas

AbstractThe broadband and dual-band rectangular microstrip antenna is realized by cutting pair of toothbrush-shaped or step slots along the non-radiating edges of the patch. The toothbrush-shaped slot is said to introduce TMd0 mode in between the TM10 and TM20 modes of the rectangular patch and realizes broadband response. In step slot cut configuration, the slot introduces a mode near the TM10 mode resonance frequency of the patch and realizes dual frequencies. In this paper, a detail analysis to study the effect of slots on the broadband and dual-band response in these rectangular microstrip antennas (RMSAs) is presented. It was observed that the slot does not introduce any mode but modifies the resonance frequency of higher order orthogonal mode and realizes broadband and dual-band response. The slot alters the direction of surface currents at higher order mode and gives similar radiation pattern characteristics over the broader bandwidth and at the dual frequencies. In broadband RMSA, a formulation of...

Nonuniform dual band array with optimum side-lobe levels

A linear symmetric stub-loaded dual-band rectangular microstrip antenna array (RMSA array) with nonuniform interelement spacing has been proposed for reduced side-lobe levels at both resonant frequencies. The interelement spacing has been optimized using a gradient search algorithm. It is observed that the side-lobe level reduces as a function of the number of elements. The predicted radiation patterns have been verified experimentally. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 615–617, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21424

A dual‐band rectangular microstrip antenna using a novel photonic bandgap ground plane of unequal orthogonal periods

AbstractThis paper presents a novel photonic bandgap (PBG) structure of unequal orthogonal periods and its application to a dual‐band rectangular microstrip antenna for performance enhancement. The two operating frequencies of the dual‐band microstrip antenna studied have orthogonal polarization planes, and by using the proposed PBG ground plane with its periods in orthogonal directions determined from the two separate operating frequencies, gain enhancements of 1.7 and 1.1 dBi have been obtained for the lower and upper operating frequencies, respectively. Details of the PBG structure studied are described, and the obtained experimental results are presented. © 2001 John Wiley &amp; Sons, Inc. Microwave Opt Technol Lett 30: 280–283, 2001.