A Multi-band Slot Antenna for

GPS/Wi-MAX/WLAN Systems

MVSR Engineering College

Presented by Omprakash (2451-12-735-302)

ContentsObjective Existing designsDesign toolsAntenna designStudies of antennaCurrent distribution and Radiation patternsConclusionReferences

ObjectiveThe design of a Multi-band slot antenna provides usage of1. Global-Positioning-System (GPS)2. Worldwide Interoperability for Microwave Access (WI-MAX) 3. Wireless-Area-Network (WLAN) is presented.

GPS is a space based navigation system that provides location and information in all weather conditions. It’s frequency lies at 1.575GHz

WI-MAX is a family of  wireless communications standards initially designed to provide 30 to 40 megabit-per-second data rates.

 WLAN is a wireless computer network that links two or more devices using a wireless distribution method within a limited area such as a home, school, computer laboratory or office building.

Existing Designs Types of Multi-band slot antennas 1. Dual band slot antenna2. Tri-band antenna

Dual-band slot antennas and Tri-band slot antennas were compact in size but their radiation slot is small.

To overcome this limitation Four-band slot antenna was proposed by using several stubs on the ultra wideband slot radiator.

Design Tools Multi-band antenna is studied and designed using the EM simulation tool

HFSS(High frequency structure simulator ) For verification of simulation results, the antenna is fabricated and measured using

the antenna measurement equipment, Satimo Starlab system.

Antenna Design Multi-band slot antenna consists of a rectangular slot with a size of L1×W1

= 48×18 sq.mm on one side of the substrate. The rectangular slot is loaded with an inverted T-shaped stub at the upper

edge of the rectangular slot and two E-shaped stubs on the left-hand (LH) and right-hand (RH) sides of the slot

The T-shaped feed patch

Tuning Range

STUDIES OF ANTENNA The effects of different radiating elements on the frequency bands of the proposed

multi-band antenna, computer simulation on S11 is carried out in four conditions1) Only the T-shaped feed patch2) Only the T-shaped feed patch and the inverted T-shaped stub3) Only the T-shaped feed patch and the two E-shaped stubs4) The completed design (proposed antenna).

When only the T-shaped feed patch is used in the slot, the antenna generates three frequency bands, bands 1, 3 and 4, at about 1.8, 3.5 and 5.2 GHz, respectively.

When the inverted T-shaped stub is added, band 1 is moved slightly down from 1.8 to 1.575 GHz, yet bands 3 and 4 remaining about the same.

When all the elements are used, the proposed multi-band antenna has four frequency bands 1) 1.522-1.588 GHz for the GPS system,2) 2.368-2.56 GHz for the IEEE 802.11b & g WLAN systems, 3) 3.19-3.832 GHz for the WIMAX system4) 4.96-5.94 GHz for the IEEE 802.11a WLAN system can be obtained

Antenna with Radiation area

computer simulation has been used to study the effects of different parameters on the four frequency bands

1.00 2.00 3.00 4.00 5.00 6.00 7.00Freq [GHz]

-25.00

-20.00

-15.00

-10.00

-5.00

0.00

dB(S

(1,1

))

HFSSDesign1XY Plot 2 ANSOFT

Curve Info

dB(S(1,1))Setup1 : Sw eep

Current distributions and radiation patterns

Fig. 7 Simulated and measured radiation patterns at (a) 1.575 GHz, (b) 2.45 GHz, (c) 3.5 GHz, and (d) 5.2 (Simulation without cable model , measurement , and simulation with cable model )

Fig. 5 Simulated cur rent distributions at (a) 1.575 GHz, (b) 2.45 GHz, (c) 3.5 GHz, (d) 5.2 GHz

3D Radiation Patterns

Conclusion Successfully designed a planar four-band slot antenna for GPS/WIMAX/WLAN.

References X. L. Sun, S. W. Cheung, and T. I. Yuk, “Dual-band monopole antenna with frequency tunable feature for

WiMAX applications,” IEEE Antennas Wireless Propag. Lett., vol. 12, pp.100-103, 2013. Y. D. Dong, H. Toyao, and T. Itoh, “Design and characterization of miniaturized patch antennas loaded with

complementary split-ring resonators,” IEEE Trans. Antennas Propag., vol. 60, no. 2, pp. 772-785, Feb. 2012. S. W. Su, “High-gain dual-loop antennas for MIMO access points in the 2.4/5.2/5.8 GHz bands,” IEEE Trans.

Antennas Propag., vol. 58, no. 7, pp. 2412-2419, Jul. 2010. K. L. Wong, and L. C. Lee, “Multiband printed monopole slot antenna for WWAN operation in the laptop

computer,” IEEE Trans. Antennas Propag., vol. 57, no. 2, pp. 324-330, Feb. 2009. J. H. Lu and B. J. Huang, “Planar compact slot antenna with multi-band operation for IEEE 802.16m

application,” IEEE Trans. Antennas Propag., vol. 61, no. 3, pp. 1411-1414, Mar. 2013.

THANK YOU