A compact printed ultra-wideband filtenna with low dispersion for WiMAX and WLAN interference cancellation
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Sådhanå (2020)45:261 https://doi.org/10.1007/s12046-020-01495-y
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A compact printed ultra-wideband filtenna with low dispersion for WiMAX and WLAN interference cancellation SURAJIT KUNDU Department of ECE, National Institute of Technology Sikkim, Ravangla, South Sikkim 737139, India e-mail: [email protected] MS received 17 May 2020; revised 19 August 2020; accepted 24 August 2020 Abstract. A printed monopole filtenna fed by a co-planar waveguide with U-shaped split slot on patch and circular split ring resonator pairs at the other side of feed is proposed in this letter. The compact filtenna of dimension 0.32k 9 0.215k (k denotes wavelength corresponding to 2.68 GHz) is capable of providing large bandwidth from 2.68 to 8.72 GHz with dual frequency notch bands over 3.28–3.84 and 4.95–6.02 GHz, primarily to eliminate the WiMAX and WLAN interferences. The dual notched antenna performances are evaluated by simulation and experimental measurement and compared to those of recently reported ultra-wideband (UWB) notched antennas. The proposed filtenna provides bidirectional E-plane and omni-directional H-plane radiation patterns with gain variation of 2–4.5 dBi and average radiation efficiency of 78% in its pass band. Also the filtenna offers minimal dispersion characteristic as stable group delay response, and linear variation of transfer function (S21) is achieved in its pass bandwidth. Keywords. Ultra-wideband (UWB) filtenna; frequency notch; printed monopole; circular split ring resonator (CSRR); U-slot.
1. Introduction Ultra-wideband (UWB) communication is very promising in present wireless communication scenario as it delivers high throughput with very low transmitting power, which makes it suitable for multiple short-range communication applications such as ranging and localization, high-speed data link, wireless sensor network, body area network, UWB radar and bio-medical imaging [1]. One design constraint of all such UWB applications is the elimination of interferences from collocated wireless bands, which can be achieved by integrating desired band notch filter to the UWB antenna. However, addition of filter makes overall package bulky and complex with excess delay, higher power requirement and additional link budget. The implementation of notch characteristic in the antenna impedance band can solve the purpose without affecting the package size, system complexity and power requirement. Such notched antennas are also called filtennas, where filtering features are integrated. Various notch realization methods have been proposed in earlier literatures [2–18]. The simplest way of frequency notch creation is etching out slot in the radiator. Various slot shapes such as V [2], T [3], L [4] and H [5] were proposed earlier. However, such methods are prominent to produce a single notch. Also creation of multiple notches using slots is not suitable as it deteriorates antenna gain, radiation efficiency and pattern [6].
Frequency notches can also be realize
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