Skip to main content Accessibility help

A CPW-fed stepped slot UWB antenna for MIMO/diversity applications

  • Raj Kumar (a1) and Neha Pazare (a2)


An ultra-wideband (UWB) slot antenna for diversity applications is introduced. The overall structure of the antenna consists of two similar coplanar waveguide (CPW)-fed stepped rectangular slots placed in an orthogonal position. The slots are asymmetric with respect to their placement in the ground plane. The CPW feeds are double stepped and terminated on hexagonal patches for better impedance matching. A wide impedance bandwidth (measured) from 3 to 12 GHz with an isolation better than 15 dB is obtained with this antenna. To improve the isolation, the design is modified and an I-shaped slot strip is introduced between the two slot antennas. With this, the isolation is brought about 25 dB of most of the band, while the impedance bandwidth remains the same (2.8–12 GHz for port 1, measured and 2.9–12 GHz for port 2, measured). The far-field radiation patterns are also measured and a peak gain of about 5 dBi is obtained. Finally, the diversity parameters such as envelope correlation coefficient and capacity loss are calculated and found to have low values. The antenna is expected to be useful for UWB diversity applications with good isolation.


Corresponding author

Corresponding author: R. Kumar Email:


Hide All
[1] Dagefu, F.T.; Oh, J.; Choi, J.; Sarabandi, K.: Measurements and physics-based analysis of co-located antenna pattern diversity system. IEEE Trans. Antennas Propag., 61 (11) (2013), 57245734.
[2] Kamarudin, M.R.; Nechayev, Y.I.; Hall, P.S.: Onbody diversity and angle-of-arrival measurement using a pattern switching antenna. IEEE Trans. Antennas Propag., 57 (4) (2009), 964971.
[3] Zhao, H.; Zhang, F.; Zhang, X.; Wang, C.: A compact band-notched ultra-wideband spatial diversity antenna. Prog. Electromagn. Res. C, 51 (2014), 1926.
[4] Azarmanesh, M.; Soltani, S.; Lotfi, P.: Design of an ultra-wideband monopole antenna with WiMAX, C and wireless local area network band notches. IET Microw. Antennas Propag., 5 (6) (2011), 728733.
[5] Kharche, S.; Reddy, G.S.; Mukherjee, B.; Gupta, R.; Mukherjee, J.: MIMO antenna for bluetooth, wi-fi, wi-MAX and UWB applications. Prog. Electromagn. Res. C, 52 (2014), 5362.
[6] Brown, T.W.C.; Saunders, S.R.; Evans, B.G.: Analysis of mobile terminal diversity antennas. IEE Proc. Microw. Antennas Propag., 152 (1) (2005), 16.
[7] Darvish, M.; Hassani, H.R.: Quad band CPW-fed monopole antenna for MIMO applications. EuCAP 2012, 1569522349, 1–4.
[8] Mohammad, S.; Nezhad, A.; Hassani, H.R.; Foudazi, A.: A dual band WLAN/UWB printed wide slot antenna for MIMO/diversity applications. Microw. Opt. Technol. Lett., 55 (3) (2013), 461465.
[9] Nezhad, S.M.A.; Hassani, H.R.: A novel triband E-shaped printed monopole antenna for MIMO application. IEEE Antennas Wireless Propag. Lett., 9 (2010), 576579.
[10] Najam, A.; Duroc, Y.; Tedjni, S.: UWB-MIMO antenna with novel stub structure. Prog. Electromagn. Res. C, 19 (2011), 245257.
[11] Zhang, S.; Ying, Z.; Xiong, J.; He, S.: Ultrawideband MIMO/diversity antennas with a tree-like structure to enhance wideband isolation. IEEE Antennas Wireless Propag. Lett., 8 (2009), 12791282.
[12] Wong, K.; Su, S.; Kuo, Y.: A printed ultra-wideband diversity monopole antenna. Microw. Opt. Technol. Lett., 38 (4) (2003), 257259.
[13] Hong, S.; Chung, K.; Lee, J.; Jung, S.; Lee, S.; Choi, J.: Design of a diversity antenna with stubs for UWB applications. Microw. Opt. Technol. Lett., 50 (5) (2008), 13521356.
[14] Votis, C.; Tatsis, G.; Kostarakis, P.: Envelope correlation parameter measurements in a MIMO antenna array configuration. Int. J. Commun. Netw. Syst. Sci., 3 (2010), 350354.
[15] Singh, H.S.; Meruva, B.; Pandey, G.K.; Bharti, P.K.; Meshram, M.K.: Low mutual coupling between MIMO antennas by using two folded shorting strips. Prog. Electromagn. Res. B, 53 (2013), 205221.


Related content

Powered by UNSILO

A CPW-fed stepped slot UWB antenna for MIMO/diversity applications

  • Raj Kumar (a1) and Neha Pazare (a2)


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.