Bandwidth Enhancement of Symmetrical Fourth-Teeth-Shaped Microstrip Antenna

Author Name(s): Angelina G. Markina, Dmitrii N. Tumakov, Nikolai B. Pleshchinskii
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The microstrip antenna with a symmetrical rectangular radiator and four teeth is described. The influence of the base geometric parameters of the antenna on the bandwidth at the base frequency was studied. The following geometric parameters of the antenna are selected: the length and the width of the radiator, the depth of cuts, the thickness of the substrate, the length of the ground plane and the width of the feed line. The regression analysis was carried out and the mathematical model describing the dependence of the bandwidth on the length and the width of the radiator and the depth of the cuts was developed. The root-mean-square error and the relative absolute error of the model were calculated. The graphs of the bandwidth dependences on the geometric parameters are presented.

It was established that the decrease of the bandwidth values is associated with an increase of the radiator width and the substrate thickness. It was shown that a slight influence on the bandwidth are made by the changes of the radiator length and the depths of the cuts only in the case when the radiator width is much smaller than its length. The proposed formula describing the relationship of the bandwidth with the geometric parameters of the antenna can be used to design a four-tooth antenna with wide bandwidth.


Nowadays microstrip antennas are among the most common and widely used types of antennas [1]. The most studied of them are microstrip antennas with rectangular and other radiators of simple geometry [1, 2]. However, the narrow bandwidth restricts the use of such antennas. There are various methods for this problem solution [3-6]. The bandwidth can be widened by adding the cutouts to the radiator. For example, the slots in the form of the letter L [7], H and U [8], the letter E [9] and even their combinations [10] are used. The ground plane is changed [11-14], as well as other methods [15, 16] are used, including the use of metamaterials [17, 18]. Due to these and other optimization approaches, the antennas not only increase the bandwidth, but also improve other characteristics of the antennas.

One of the promising areas is the creation of so-called tooth antennas (the antennas with the cutouts on the sides of a rectangular radiator). For example, in [19] such an antenna is described with the cutouts only on one side, and the symmetrical tooth antenna was studied in [20]. In [21], it is considered tooth antennas with stepped radiating elements, and microstrip patch antenna with seven operating ranges is presented in [22].

However, the process of any antenna design that has certain electrodynamic characteristics is quite long and time consuming. One of the promising approaches is the use of regression models describing the relationship between the electrodynamic characteristics of an antenna and its geometry [23]. Using these relationships, you can determine an approximate shape of an antenna immediately, which will be well matched in a given frequency range. This approach facilitates the antenna design process and allows to obtain a well-matched antenna in a shorter period of time.

In this paper we consider the antenna with a symmetrical four-tooth radiator. The influence of the radiator geometry on the antenna bandwidth is shown. The regression model is designed that describes the relationship of the bandwidth at the base frequency with the geometric parameters of the radiator. The influence of the substrate thickness, ground plane dimensions, radiator scale and the width of the feeding line on the bandwidth are analyzed. Graphs showing the dependence of the bandwidth on tunable antenna parameters are presented.


The microstrip antenna with the radiator of symmetrical four-tooth shape is considered. The dependencies of the bandwidth at the base frequency on geometric parameters of the radiator and other antenna parameters were studied. The regression model is developed for the bandwidth. The behavior of the bandwidth is analyzed when other parameters of the antenna are changed.

The obtained regression model (together with the regression model for the base frequency) can be used to find the maximum values of BW at given constraints on the radiator parameters. After the obtaining of the radiator dimensions, it is possible improve the bandwidth by the corresponding change of other antenna parameters.


The work is performed according to the Russian Government Program of Competitive Growth of Kazan Federal University.


[1] R. Garg, P. Bhartia, I. Bahl, A. Ittipiboon, Microstrip antenna design handbook. Artech house, 2001.

[2] T.A. Milligan, Modern antenna design. New Jersey, John Wiley & Sons, 2005.

[3] R.M. Elsagheer, “Study on bandwidth enhancement techniques of microstrip antenna”, Journal of Electrical Systems and Information Technology, vol. 3, pp. 527-531, 2016. doi: 10.1016/j.jesit.2015.05.003.

[4] A. Kumar, N. Gupta, P.C. Gautam, “Gain and bandwidth enhancement techniques in microstrip patch antennas – a review”, International Journal of Computer Applications, vol. 148, no. 7, pp. 9-14, 2016. doi: 10.5120/ijca2016911207.

[5] C. Sharma, A. Sharma, “A review paper based on various bandwidth enhancements techniques for ultra-wide band antennas”, International Journal of Science Technology & Engineering, vol. 2, no. 8, pp. 1-7, 2016.

[6] M. Gouda, M.Y.M. Yousef, “Bandwidth enhancement techniques comparison for ultra wideband microstrip antennas for wireless application”, Journal of Theoretical and Applied Information Technology, vol. 35, no. 2, pp. 184-193, 2012.

[7] S.S. Mishra, M.K. Singh, D.C. Dhubkariya, “Performance analysis and bandwidth enhancement of rectangular microstrip patch [MSP] antenna using compact double “L” slotted technique for broadband applications”, International Journal of Enhanced Research in Science Technology \& Engineering, vol. 3, no. 1, pp. 418-423, 2014.

[8] S.N. Ather, P.K. Singhal, “Truncated rectangular microstrip antenna with H and U slot for broadband”, International Journal of Engineering Science and Technology, vol. 5, no. 1, pp. 114-118, 2013.

[9] D. Sugumar, T.J.S. Hephzibah, T.A. Jones, C.V. Viji, “E slotted rectangular microstrip antenna with coaxial feed for bandwidth enhancement”, International Journal of Computer Science, Systems Engineering and Information Technology, vol. 4, no. 1, pp. 77-80, 2011.

[10] J.C. Rao, K.P. Rajashekar, G.P. Kumar, “H-U-E Shaped slotted microstrip antenna for bandwidth enhancement”, International Journal of Future Generation Communication and Networking, vol. 7, no. 4, pp. 141-148, 2014.

[11] S.B. Pokharkar, S.P. Bhosale, “Improve bandwidth of microstrip slotted patch antenna using two square shape defected ground structure”, International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, vol. 3, no. 6, pp. 9823-9828, 2014.

[12] K. Mondal, P. Sarkar, “Enhancement of the gain and bandwidth of the microstrip patch antenna with modified ground plane” International Journal of Microwave and Wireless Technologies, vol. 9, no. 5, pp. 1179-1184, 2017. doi: 10.1017/S1759078716001276.

[13] N. Prombutr, P. Kirawanich, P. Akkaraekthalin, “Bandwidth enhancement of UWB microstrip antenna with a modified ground plane”, International Journal of Microwave Science and Technology, ID 821515, 7 pages, 2009. doi: 10.1155/2009/821515.

[14] P. Mishra, P. Gupta, “Bandwidth improvement of UWB microstrip antenna using finite ground plane”, International Journal of Engineering Research and Applications, vol. 5, no. 6, pp. 22-25, 2015.

[15] R.C. Hadarig, M.E. de Cos, F. Las-Heras, “Microstrip patch antenna bandwidth enhancement using AMC/EBG structures”, International Journal of Antennas and Propagation, ID 843754, 6 pages, 2012. doi:10.1155/2012/843754.

[16] S.M. Shaka, R.T. Prashant, R.M. Vani, P.V. Hunagund, “Enhanced bandwidth of rectangular microstrip antenna using uniplanar EBG cells”, International Journal of Innovative Research in Computer and Communication Engineering, vol. 2, no. 4, pp. 3860-3865, 2014.

[17] H. Xiong, J.-S. Hong, Y.-H. Peng, “Impedance bandwidth and gain improvement for microstrip antenna using metamaterials”, Radioengineering, vol. 21, no. 4, pp. 993-998, 2012.

[18] T. Bougoutaia, D. Khedrouche, A. Hocini, “Bandwidth improvement for compact microstrip patch antenna using metamaterials”, Acta Physica Polonica A, vol. 129, no. 4, pp. 538-540, 2016. doi: 10.12693/APhysPolA.129.538.

[19] A.-A. Kalteh, S. Nikmehr, “Wide-band comb-shaped slotted microstrip patch antenna”, 2nd National Electrical Eng. Conf., ID NEEC2010-F-337, Febr. 2010.

[20] A.G. Markina, N.B. Pleshchinskii, D.N. Tumakov, “On electrical characteristics of comb-shaped microstrip antennas”, Young Researchers in Electrical and Electronic Engineering (EIConRus), 2017 IEEE Conference of Russian, IEEE, pp. 179-183, 2017. doi: 10.1109/EIConRus.2017.7910523.

[21] A. Boutejdar, A. A. Ibrahim, E. P. Burte, “Novel microstrip antenna aims at UWB applications”, Microwaves & RF, pp. 62-66, Oct. 2015.

[22] K. Mandal, “Seven-Band Comb-Shaped Microstrip Antenna for Wireless Systems”, PIER Letters, vol. 59, pp. 15-20, 2016.

[23] D.N. Tumakov, G.V. Abgaryan, D.E. Chickrin, P.A. Kokunin, “Modeling of the Koch-type wire dipole”, Applied Mathematical Modelling, vol. 51, pp. 341-360, 2017. doi: 10.1016/j.apm.2017.07.007.

[24] J.O. Rawlings, S.G. Pantula, D.A. Dickey, Applied regression analysis: a research tool, Springer Science & Business Media, 2001.

[25] A.G. Markina, D.N. Tumakov, N.B Pleshchinskii, “On base frequency for the symmetrical four comb-tooth-shaped microstrip antenna”, Journal of Fundamental and Applied Sciences, vol. 9, no. 1S, pp. 1534-1547, 2017. doi: 10.4314/jfas.v9i1s.802.

[26] L.C. Paul, Md.S. Hosain, S. Sarker, M.H. Prio, M. Morshed, A.K. Sarkar, “The effect of changing substrate material and thickness on the performance of inset feed microstrip patch antenna”, American Journal of Networks and Communications, vol. 4, no. 3, pp. 54-58, 2015. doi: 10.11648/j.ajnc.20150403.16.

[27] N. Rao, D.V. Kumar, “Gain and bandwidth enhancement of a microstrip antenna using partial substrate removal in multiple-layer dielectric substrate”, PIERS, pp. 1285-1289, 2011.

[28] A. Anufrieva, D. Tumakov, “Peculiarities of electromagnetic wave propagation through layers with ridge-shaped refractive index distribution”, MMET, pp. 386-389, 2012. doi: 10.1109/MMET.2012.6331200.

[29] N.B. Pleshchinskii, D.N. Tumakov, “Analysis of electromagnetic wave propagation through a layer with graded-index distribution of refraction index”, PIERS, pp. 425-429, 2012.

[30] N.B. Pleshchinskii, D.N. Tumakov, “The reconstruction of dielectric profile of a layer for the harmonic wave case”, PIERS, pp. 643-647, 2013.

[31] D. Tumakov, “On optimal frequencies for reconstruction of a one-dimensional profile of gradient layer’s refractive index”, International Journal of Optics, ID 841960, 7 pages, 2014. doi:10.1155/2014/841960.

[32] M.S. Rabbani, H. Ghafouri-Shiraz, “Simple methods for enhancing bandwidth of a rectangular microstrip patch antenna”, 2nd IET Annual Active and Passive RF Devices Seminar, pp. 1-4, 2014. doi: 10.1049/ic.2014.0184.

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