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Abstract A defected ground structure notch band antenna is proposed in this work. The switchable characteristics for the designed notch band antenna are achieved through open-end slots on/off positions. The proposed DGS notch band antenna is capable of notching the frequency bands 3–4, 5.5–6.5 GHz, respectively. A high notch band rejection with VSWR greater than 2 and the return loss greater than −10 dB is achieved at the notching frequencies. The defected ground structure is providing balance in the impedance bandwidth to the designed models. By sorting the slots on the radiating structure, the tunability in the notching frequencies is attained in this paper. The antenna radiation characteristics and the surface current distributions at operating bands as well as at notch bands are presented in this work. The proposed notch band antenna is providing high rejection of gain in the notch band and average gain of 2.8 dB in the operating band. Keywords Defected ground structure Switchability Ultra-wideband





Monopole antenna
Notch band

1 Introduction The accelerated generation of wireless communication systems has constituted a demand for reconfigurable or tunable filters and antennas [1–3]. These type of devices reduces the compulsion to yield extravagant charges correlated with the refitting of wireless infrastructures, considering that an adjustment in the frequency, bandwidth, or other conditions of the hardware can be attained over electronic/ mechanical reconfiguration. Reconfigurable equipment further produces the appropriate hardware for a highly capable management and adoption of a spectrum V. Allam (&)
B. T. P. Madhav Department of ECE, K L University, Guntur, Andhra Pradesh, India e-mail: [email protected] B. T. P. Madhav e-mail: [email protected] © Springer Nature Singapore Pte Ltd. 2018 S. C. Satapathy et al. (eds.), Smart Computing and Informatics, Smart Innovation, Systems and Technologies 77, https://doi.org/10.1007/978-981-10-5544-7_14

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through the theory of dynamic spectrum approach and cognitive radio [4–8]. Utilization of reconfigurable devices again allows the time allocation of hardware, which in turn advantages to mass and size contraction of the communication system. This is a great condition in compact devices and of significant influence in satellite communication systems [9–12]. UWB is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum. Ultra-wideband is a technology for transmitting information spread over a large bandwidth ranging from 3.1 to 10.6 GHz. Ultra-wideband characteristics are well suited to short-distance applications, such as peripherals of PC, personal area network (PAN), medical and radar imaging. Due to short duration of UWB pulses, it is easier to provide high data rates [13]. Ultra-wideband characteristics are well suited to short-distance applications, due to its low emission levels permitted by regular agencies. Th