A Novel Design for C-Slot RMSA Yielding Quadruple Frequency

A Novel Design for C-Slot RMSA Yielding Quadruple Frequency

Arzan Elchidana1, Sujitha Kurup2, Chandrabala Kothari3, Tazeen Shaikh4

Department of Electronics and Telecommunication SVKM NMIMS,

MPSTME,

Mumbai, India.

Abstract

The paper focuses on design of RMSA with an etched C-slot for obtaining Quadruple frequencies at 3.7 GHz,

1. GHz, 6.4 GHz and 6.8 GHz. RMSA with dielectric constant 2.4, tangential loss of 0.001. It is simulated using IE3D, working on Method of Moments for obtaining optimum antenna parameters using Transmission Line Model and incorporating co axial feed. This antenna can be used for Radio astronomy,

   microwave devices/communications, wireless LAN, most modern radars, communications satellites, satellite television broadcasting & amateur radio.

   1. Introduction

      In todays world of scaling and reducing the size of devices, microstrip antennas have attracted a lot of attention due to rapid growth in wireless communication area. Several patch antenna designs with single-feed, dual-feed operation have been proposed. The increasing use of microwave mobile communication systems demand antennas for different systems & standards with properties like reduced size, broadband, multiband operation, moderate gain etc.[1],[2] that work in a different range of frequencies. Designed Quadruple frequency Rectangular Microstrip Patch Antenna operates at 3.7GHz, 4.7 GHz, 6.4 GHz and 6.8 GHz each having its own advantages & uses. As the 2.4GHz band used for wireless applications is becoming over crowded, the applications running on those frequencies are moving to higher frequencies so as to have a higher Signal-to-Noise Ratio (SNR). This Antenna can be used for applications such as Wi-Fi access points, microwave ovens, cordless phones, Bluetooth devices & baby monitors. Certain Frequencies are unavailable in certain parts of the

      world & hence we need antennas operation at multiple frequencies so that the same antenna can be operated at a different frequency for the same operation [2] [7].

      The multi-frequency characteristics here are studied using a C & inverted C slot antenna structure. Because of many attractive features of patch antennas these antennas have received over whelming support and are used in most of the practical applications such as mobile phones to Vehicular GPS systems [3].

   2. Antenna Protocol

      Width of the Patch (W).

      Effective Dielectric constant of Antenna ( )

      Effective length of antenna ( )

      Extended Length of Antenna ( )

      Length of Antenna (L)

      The patch shown is designed using these formulas.

      Figure 1: C slots etched on Rectangular Patch Antenna

      Figure 2: Patch Antenna (With Feed)

      Table 1: Optimized Antenna Parameters

      Antenna Parameter	Value
      Resonant Frequency	5GHz
      Dielectric Constant	2.4
      Thickness (h)	1.5 mm
      Length	17 mm
      Width	20.5 mm

   3. Simulation Results

      The Micro Strip Patch Antenna is designed using IE3D working on Methods of Moment. The Method of Movements for discretizing integral equations in electromagnetics is an extremely powerful and versatile general numerical methodology for electromagnetic field simulation in antenna and scattering applications. It is a numerical computational method of solving linear partial differential equations which have been formulated as integral equations. The antenna feed is a Coaxial Line using SMA connector.

      Figure 3: S Parameters

      Return loss at 3.7 GHz = -13.2 dB Return loss at 4.8 GHz = -11 dB Return loss at 6.5 GHz = -16 dB Return loss at 6.8 GHz = -10.5 dB

      The maximum return loss is obtained at 6.5GHz.

      Figure 4: Elevation Pattern

      The elevation pattern of the antenna shows that the radiation pattern is bidirectional. A bidirectional antenna can be used to transmit a signal to two different receivers at the same time or vice versa, i.e. it can be used to receive a signal from two receivers.

      Figure 5: Azimuth Pattern

      Figure 6: Radiation Efficiency

      The maximum radiation efficiency of the antenna is found to be 82%

      Figure 7: VSWR

      The VSWR for the specified antenna protocol is found out to be below 2 and hence it is ideal for practical implementation in communication systems.

      Figure 8: Elevation Pattern at 6.8GHz

   4. Conclusion

      In this paper, the slots enable the antenna to operate at quadruple frequencies, thus suitable for more than one application in communication systems. The gain achieved is 6.2dB which is a necessity for an efficient system. The Directivity achieved is around 9.3 and hence we have an advantage of two beams with good directivity and linear polarization.

   5. Reference

[1]. C.A. Balanis,Antenna Theory, John Wiley & Sons, New Jersey, 2005.

[2]. Gupta R., Raghuvashi D.K, Design of E- Shape Patch Antenna using IE3D Simulator, ISSN Journal, Volume 3, Issue , August.

[3]. Nalbantoglu D., Yanik A, A Multi-Band Rectangular Patch Antenna for Wireless Communication, Antenna & Propagation, Sabanci University, Spring 2004.

[4]. Sen A., Chattoraj N, Quadruple-Frequency Microstrip Antenna for Wireless Applications and its Equivalent Circuit, Birla Institute of Technology, Ranchi.

[5]. Abdipour M., Moradi G., Shirazi R.S, A Design Procedure for Active Rectangular Microstrip Patch Antenna, International Journal of Electronics and Communication Engineering & Technology, Volume 3, issue 1, 2012.

[6]. Deshmukh A. A., Ray K.P., Half U-Slot Loaded Multi-Band Rectangular Microstrip Antennas, International Journal of Microwave and Optical Technology, Vol. 2, No.3, July 2007.