Implementation and parametric analysis of single and dual band planar filtering antennas for WLAN applications
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Implementation and parametric analysis of single and dual band planar filtering antennas for WLAN applications Nithya Dorairajan1
•
Chitra M. Perumal2
Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Implementation and parametric analysis of single and dual band planar filtering antennas suitable for WLAN applications are described in this paper. The single band filtering antenna is designed using the filter synthesis approach in which the last resonator of the 5th order Chebyshev stub loaded bandpass filter is replaced by a monopole antenna. The dual band filtering antenna is designed by adding Electromagnetic Band Gap structures in the ground plane of stub fed patch antenna. The parameters of the two filtering antennas are analyzed and provide validation of the merits and demerits of the two design techniques used in the implementation of filtering antennas. Single band filtering antenna is designed at a center frequency of 2.4 GHz and has a gain of 3.1 dBi with less than - 16 dB reflection coefficient. The filter selectivity at the band edges is found to be 75/86 dB/GHz. The size of the single band filtering antenna is 0.68 k0 9 0.216 k0 (k0 is the operating wavelength) and the structure is suitable for WLAN applications. Dual band filtering antenna is designed to have two operating bands at center frequency 1.875 GHz and 2.4 GHz. The reflection coefficient at the two operating bands is found to be less than – 20 dB and produces radiation nulls on either side of the two operating bands. The proposed dual band filtering antenna has dimension 0.57 k0 9 0.714 k0 and is suitable for LTE and WLAN applications as it has a gain of 5.8 dBi and 4.08 dBi at 1.875 GHz and 2.4 GHz respectively. Keywords Antenna Filter Filtenna Microstrip Multiband Multifunction module
1 Introduction Compact and multifunctional RF front end is the main requirement of modern wireless systems. The key components of the RF front end are Bandpass filter (BPF) and antenna. In conventional wireless systems, the filtering and radiating components are constructed separately and this increases the size of the RF front end and degrades the device performance due to insertion and impedance mismatch loss. Hence, for achieving compactness and to improve device performance, instead of constructing filtering and radiating elements separately, the two & Nithya Dorairajan [email protected] Chitra M. Perumal [email protected] 1
Sathyabama Institute of Science and Technology, Chennai, India
2
Panimalar Institute of Technology, Chennai, India
components can be integrated as a single module. Such a multifunctional module performing both filtering and radiating function together is called a filtering antenna or a filtenna. Figure 1 shows the filtering antenna module which replaces the separate modules of filter and antenna. Integrating filtering and radiating elements on the same substrate offers many challenges as the antenna requires substrate with low d
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