Poly Fractal Boundary Circularly Polarised Microstrip Antenna for WLAN/Wi-MAX Wireless Applications

2015 ◽  
Vol 65 (5) ◽  
pp. 379 ◽  
Author(s):  
V.V. Reddy ◽  
N.V.S.N. Sarma
Keyword(s):  
Microstrip Antenna ◽  
Axial Ratio ◽  
Fractal Boundary ◽  
Circular Polarisation ◽  
Wireless Applications ◽  
Koch Fractal

<p class="MsoNormal" style="text-align: justify;">The design of circularly polarised multiband poly fractal boundary microstrip antenna is proposed and experimentally studied. Initially the two orthogonal sides of the square patch are replaced with different fractal curves for circular polarisation (CP) radiation. Along the x and y axes, Minkowski and Koch fractal curves are employed. A 45° rotated poly fractal slot is embedded at the center of the fractal patch for triband CP operation. The indentation depths and indentation angles of the Minkowski and Koch fractal curves are optimised for better CP emission. The inserted fractal slot redistributes the current elements on the patch for tri band CP radiation. The measured 3-dB axial ratio bandwidths of the proposed antenna at 2.4 GHz, 3.4 GHz, and 5.8 GHz are 1.53 per cent, 0.81 per cent, and 1.62 per cent respectively, making it an able candidate for WLAN and Wi-MAX wireless applications.</p>

Reactive impedance surface-based broadband circularly polarized Koch fractal boundary microstrip antenna

2014 ◽  
Vol 8 (2) ◽  
pp. 243-250
Author(s):  
V. V. Reddy ◽  
N.V.S.N. Sarma
Keyword(s):  
Single Layer ◽  
Axial Ratio ◽  
Fractal Boundary ◽  
Impédance Surface ◽  
Broadband Antenna ◽  
Impedance Surface ◽  
Circularly Polarized ◽  
Wireless Applications ◽  
Koch Fractal ◽  
Iteration Order

A circularly polarized (CP) broadband antenna is proposed for wireless applications in the range of 2–3 GHz frequency. It consists of asymmetrical Koch fractal boundary patch over a reactive impedance surface (RIS) substrate. The simulations of single-layer Koch fractal antenna, dual layer with square and fractal RIS elements are carried out in a systematic way for broadband CP radiation and corresponding results are presented. For better CP characteristics, properties of fractal curves and dimensions of RIS elements are optimized. The antenna with fractal RIS iteration order one (iteration1) is experimentally studied. The 10-dB return loss bandwidth is 50.35%, whereas 3-dB axial ratio bandwidth is 7.45%, which indicate that by applying fractals concept to RIS technique, with a single probe feed, broadband CP radiation can be obtained.

Single layer single probe feed circularly polarized triple band fractal boundary microstrip antenna for wireless applications

2016 ◽  
Vol 9 (3) ◽  
pp. 657-664 ◽  
Author(s):  
V.V. Reddy ◽  
N.V.S.N. Sarma
Keyword(s):  
Microstrip Antenna ◽  
Single Layer ◽  
Axial Ratio ◽  
Cost Effective ◽  
Fractal Boundary ◽  
Circularly Polarized ◽  
Wireless Applications ◽  
Multiband Antennas ◽  
Single Probe ◽  
Triple Band

Triple band circularly polarized fractal boundary microstrip antenna is proposed and experimentally studied. The two orthogonal sides of the square patch are replaced with asymmetrical fractal curves for circular polarization (CP) radiation. A 45° rotated asymmetrical fractal slot is embedded at the center of the fractal patch for triband CP operation. The indentation factors of the fractal curves are optimized for better CP emission. The inserted fractal slot redistributes the current elements on the patch for triband CP radiation. The proposed antenna is implemented over a single layer with a single probe feed, so it is simple to fabricate and is cost effective when compared with the existing stacked layered multiband antennas in the open literature. The measured 3 dB axial ratio bandwidths of the proposed antenna at 2.4, 3.4, and 5.8 GHz are 2, 1, and 1.8%, respectively, so it is well suited for WLAN and Wi-MAX wireless applications.

scholarly journals The Effect of Indentation Angle of Koch Fractal Boundary on the Performance of Microstrip Antenna

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
P. Nageswara Rao ◽  
N. V. S. N. Sarma
Keyword(s):  
Resonant Frequency ◽  
Experimental Verification ◽  
Microstrip Antenna ◽  
Fractal Boundary ◽  
Triangular Patch ◽  
Resonant Behavior ◽  
Koch Fractal

The effect of indentation angle of Koch fractal boundary applied to a triangular patch on the resonant behavior and bandwidth is presented. It is shown that the resonant frequency can be controlled by changing the indentation angle of the boundary. With the experimental verification, it is established that for an indentation angle of more bandwidth is obtained compared to conventional .

Tri-band dual circularly polarized planar antenna with defective ground structure for wireless applications

2015 ◽  
Vol 8 (7) ◽  
pp. 1121-1128 ◽  
Author(s):  
B. Rama Sanjeeva Reddy ◽  
D. Vakula
Keyword(s):  
Microstrip Antenna ◽  
Axial Ratio ◽  
Impedance Bandwidth ◽  
Antenna Gain ◽  
Ground Structure ◽  
Wireless Applications ◽  
Single Probe ◽  
Narrow Bandwidth ◽  
Linearly Polarized

A novel tri-band asymmetric slot with defective ground structure (DGS) microstrip antenna for dual circular polarization (CP) is proposed. By placing a slot with 45° across diagonally at the center of the patch, excites resonant bands with narrow bandwidth and dual CP operation. The main design challenge is to introduce optimized defected element of circular dumbbell shape to enhance the impedance bandwidth with frequency shift operation at all bands. DGS enabled antenna is practically fabricated and simulated. Antenna is compact in size and shows a good quality of CP at two resonant bands and linearly polarized at one band. Structure displays the impedance bandwidth of 8% (2.26–2.45 GHz), 5.45% (3.41–3.6 GHz) and 3.07% (5.12–5.28 GHz). The design also shows 40 and 11 MHz, 3-dB axial ratio bandwidth at lower and middle bands, respectively. Simulated gain for each band is 4.72, 6.2 and 4 dB. Performance of antenna with and without DGS is also studied and compared. This single probe feed proposed antenna remains consistent with good radiation patterns and sufficient antenna gain over the operating bands. Excellent agreement was obtained between measurements and simulations.

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