RESEARCH ARTICLE Elliptical shaped wide slot monopole patch antenna with crossed shaped parasitic element for WLAN, Wi-MAX, and UWB application Pawan K. Jain 1 | Braj Raj Sharma 2 | Krishan G. Jangid 1 | Sumita Shekhawat 1 | Virender K. Saxena 1 | Deepak Bhatnagar 1 1 Microwave Lab, Department of Physics, University of Rajasthan, Jaipur, India 2 Department of Physics, SKIT M &G, Jaipur, India Correspondence Deepak Bhatnagar, Microwave Lab, Department of Physics, University of Rajasthan, 302004, Jaipur, India. Email: dbhatnagar2010@gmail.com Abstract This paper illustrates the design and performance of microstrip feed elliptical shaped patch antenna having crossed shaped parasitic element. The overall size of antenna is 40 mm × 40 mm × 1.59 mm. For optimiza- tion of the performance of antenna, CST Microwave studio 2014 simulator is used while antenna is tested with available facilities under laboratory conditions. Proposed antenna provides triple impedance bandwidth extended between frequency ranges of 2.28-2.62 GHz, 2.70-3.96 GHz, and 5.1-6.29 GHz with flat gain (close to 3-5 dBi) in the desired frequency range. Good circu- lar polarization conditions are realized at frequency 5.90 GHz for different sets of elevation and azimuth angles with maximum axial ratio bandwidth close to 600 MHz at the same frequency. The SAR values at desired frequencies are much lower than those for speci- fied frequencies of modern communication systems. This antenna may be a useful structure for Wi-Fi, WLAN, Wi-MAX communication bands and lower and median UWB bands. KEYWORDS bandwidth, circular polarization, gain, parasitic element, SAR 1 | INTRODUCTION In modern wireless communication systems, multiband antennas have their crucial role. 1,2 IEEE 802.11 and IEEE 802.16 standards allocated 2.4/5.2/5.8 GHz as WLAN bands and 2.5/3.5/5.5-GHz as Wi-MAX bands, respectively. These bands have wide applications in smart phones, hand hold computers, and various wireless portable devices. Designing of circularly polarized multiband monopole planar antennas covering all these bands and having desired characteristics such as low profile, compact size, omni-directional pattern, and small SAR value is a challenging task. 3-5 Various antenna designs have been reported by researchers to mini- mize the instinctive limitations of planar patch structure. 6-13 Dual band multistrip monopole patch antenna with modified ground was designed by Kaur et al 6 for WLAN/IMT/ BLUETOOTH/Wi-MAX applications. Behera et al 7 applied triple U-slots in the radiating patch to attain WLAN and Wi- MAX communication. Compact radiator patch structure was proposed by Sun et al 8 which covered all the bands of WLAN. Ring slotted circularly polarized U-shaped printed monopole antenna was proposed by Jangid et al 9 for various wireless applications. A dual layer circular patch structure was reported by Chen and Liu 10 for WLAN and Wi-MAX applications. The parasitic patch was strongly coupled with lower patch with the help of slots located in the lower patch. Sharma and Gangwar 11 reported a low profile cylindrical dielectric resonator for wireless application. 11 Cheong et al 12 reported a novel CPW structure with three fractal S-shaped patches for WLAN and Wi-MAX applications. It was found that the number of resonance is directly proportional to the number of fractal s-shape patches. A square spiral patch antenna was presented by Beigi et al 13 for multiband opera- tions. In this communication, various frequency resonances were obtained by using square spiral patch with two L-shape strips. All these reported antennas 6-13 have wide physical size and do not show circular polarization. The main aspire of this communication is to provide a compact planar design which has multi band performance with concurrent advancement in gain and axial bandwidth. It is a realized fact that circular polarization can be easily achieved with an elliptical design in comparison to conven- tional rectangular or circular configuration. In this investiga- tion, design and performance of an elliptical patch structure having a crossed shaped parasitic element with defected gro- und structure is discussed. This crossed shaped parasitic ele- ment is placed just on upper side of the patch to revamp the electric field without disturbing the radiation performance of Received: 22 July 2019 DOI: 10.1002/mop.32100 Microw Opt Technol Lett. 2019;1–7. wileyonlinelibrary.com/journal/mop © 2019 Wiley Periodicals, Inc. 1