Design and development of metamaterial bandpass filter for WLAN applications using circular split ring resonator

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Gnanasekaran Revathi ◽  
Savarimuthu Robinson
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Ring Resonators ◽  
Method Of Moment ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Split Ring ◽  
Filter Structure

Abstract In this paper, a metamaterial bandpass filter using Split Ring Resonators (SRR) is designed, analyzed, and developed for WLAN applications at 2.4 GHz frequency band. Here, metamaterial bandpass filters with and without Defected Ground Structure (DGS) are designed, analyzed and compared. The filter structure shows a considerable size reduction with 50% fractional bandwidth, quality factor of 2 and wide bandwidth. The simulation results of the proposed filters offered good insertion loss and return loss response. The filters have been modeled, fabricated and their performance has been evaluated using the Method Of Moment (MOM) based electromagnetic simulator IE3D. The dimensions of the proposed filter is 20 × 9 × 1.6 mm which is considerably reduced. The simulated and measured results projected that the proposed metamaterial filters are well suited for WLAN applications.

Reduced Cross-Polarization Patch Antenna with Optimized Impedance Matching Using a Complimentary Split Ring Resonator and Slots as Defected Ground Structure

2021 ◽  
Vol 36 (6) ◽  
pp. 718-725
Author(s):  
Narayanasamy RajeshKumar ◽  
Palani Sathya ◽  
Sharul Rahim ◽  
Akaa Eteng
Keyword(s):  
Patch Antenna ◽  
Ring Resonator ◽  
Impedance Matching ◽  
Equivalent Circuit Model ◽  
Split Ring Resonator ◽  
Cross Polarization ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Split Ring ◽  
Surface Current Density

An innovative method is proposed to improve the cross-polarization performance and impedance matching of a microstrip antenna by integrating a complimentary split ring resonator and slots as a defected ground structure. An equivalent circuit model (ECM) enables the design take into consideration the mutual coupling between the antenna patch and the Defected Ground Structure. The input impedance and surface current density analysis confirms that the integration of a CSRR within a rectangular microstrip patch antenna leads to uniform comparative cross-polarization level below 40 dB in the H-plane, over an angular range of ± 50°. Introducing parallel slots, as well, leads to a reduction of spurious antenna radiation, thereby improving the impedance matching. Measurements conducted on a fabricated prototype are consistent with simulation results. The proposed antenna has a peak gain of 4.16 dB at 2.6 GHz resonating frequency, and hence is good candidate for broadband service applications.

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