A Novel Compact Monopole Multiband Antenna for WiMAX/Satellite/Military Applications
A compact Microstrip-fed monopole multiband antenna has been designed and simulated in this paper. The design of the antenna has compact structure with size of 20 × 18 × 1 mm3. The proposed antenna has multiband characteristics which work at 4.2, 6.1, and
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Abstract A compact Microstrip-fed monopole multiband antenna has been designed and simulated in this paper. The design of the antenna has compact structure with size of 20 × 18 × 1 mm3. The proposed antenna has multiband characteristics which work at 4.2, 6.1, and 12.1 GHz. Additional resonances are excited by embedding two I-shaped notches in the ground plane. The bandwidth of 112 % is achieved by embedding an inverting U-shaped notch on the radiating patch. At each frequency, Return loss < −20 dB and VSWR < 2.
Keywords Monopole antenna G-slot VSWR Return loss Radiation pattern
Three notched bands
WiMAX
1 Introduction Due to the rapid growth in wireless communication, the need of multiband frequency is raised. Thus, an antenna with multiband operations is required. Multiband antennas are developed for various wireless applications so that any equipment can employ several applications at a time. These applications can involve data transfer, video, audio, and radio. In multiband antenna, one part works for one band while another part works for different band. A multiband antenna can have lower than average gains. These are manufactured to work at high frequencies from MHz to several GHz [1–6]. A. Verma (&) B. Singh P. Jain Department of ECE, Amity University, Noida, U.P., India e-mail: [email protected] B. Singh e-mail: [email protected] P. Jain e-mail: [email protected] S. Yadav Department of ECE, Government Women Engineering College, Ajmer, Rajasthan, India e-mail: [email protected] © Springer Science+Business Media Singapore 2016 S.C. Satapathy et al. (eds.), Proceedings of International Conference on ICT for Sustainable Development, Advances in Intelligent Systems and Computing 409, DOI 10.1007/978-981-10-0135-2_31
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A planar monopole microstrip patch is widely used for manufacturing the multiband antenna due to its various attractive features like low profile, low cost, small size, and easy to fabricate. It has a very large antenna quality factor. This factor presents antenna’s losses and a high-quality factor gives rise to narrow bandwidth and low efficiency. Quality factor can be decreased by increasing the substrate’s thickness. But as the thickness increases, an increment fraction of total radiated power produced by load goes into surface wave. This surface current counts as an undesired power loss and is responsible for degradation of the characteristics of antenna. Nowadays, many researchers are working on size reduction and bandwidth enhancement techniques. Bandwidth enhancement techniques in planar antenna are obtained by E-slot patch, H-slot patch, U-shaped slot patch, shorting pin, and slit loaded. Defected ground structure is also responsible for addition resonances to enhance bandwidth. Many trade-offs are taken to optimize the geometry of an antenna [6–9]. In this paper, a monopole antenna with multiband operations is demonstrated. The defected ground structure is employed for the excitation of additional resonances to enhance the ba
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