Gain Improvement of a Wideband Monopole Antenna with Novel Artificial Magnetic Conductor Mohammed Amin Meriche, Hussein Attia, Abderraouf Messai and Tayeb A. Denidni, Instituit National de la Recherche Scientifique (INRS) Center for Energy, Materials and Telecommunications (EMT) University of Quebec, Montreal, Canada July, 2016

Outline Introduction Antenna and AMC design Simulated results Conclusions

Introduction Examples of wireless networks include cell phone networks, Wireless local networks, wireless sensor networks, satellite communication networks, and terrestrial microwave networks. Wireless networking is a method by which homes, telecommunications networks and enterprise installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.

Introduction Wideband antennas with Artificial Magnetic Conductor (AMC) have been investigated in the last years to provide low-profile antennas with large bandwidth, high-gain and simple structure. AMC can be realized by arranging metallic unit cell structure periodically in a two-dimensional lattice[1,2]. [1] N. M. Mohamed-Hicho, E. Antonino-Daviu, M. Cabedo-Fabrés, and M. Ferrando-Bataller, “A Novel Low-Profile High-Gain UHF Antenna Using High-Impedance Surfaces,” IEEE Trans. Antennas Propag., vol. 14, pp.1014–1017, 2015.

Introduction [2] W. Yang, W. Che, and H Wang, “High-Gain Design of a Patch Antenna Using Stub-Loaded Artificial Magnetic Conductor,” IEEE Antennas and Wirel. Propag. Lett., vol. 12, pp. 1172–1175, 2013.

Introduction Gain improvement is the main objective in this paper We present a novel design of artificial magnetic conductor as a ground plane of a coplanar-waveguide (CPW)-fed monopole antenna for WLAN and WiMAX applications. Firstly, we study the operating bandwidth of the AMC and insert them as an artificial magnetic ground plane Finally we have to compare the simulated results of the antenna alone and with AMC using the CST MWS simulator.

Configuration of the proposed antenna The radiating antenna is a circular patch with a radius of R = 12 mm printed on a grounded substrate with the CPW feed line. The antenna substrate is Rogers RO4003C (ε_r= 3.38, tan δ = 0.0027) with W × L = 35 mm × 35 mm a thickness of 1.524 mm. A 4 × 4 array of AMC unit cells with total planar dimensions of 80 mm × 80 mm serves as a ground plane for the CPW fed monopole antenna is used. The proposed antenna were simulated using CST MWS (ver.15).

AMC design The figure shows the geometry of the new dual-band AMC unit cell. The unit cell shape is based on an U-slot loaded square patch printed over a Rogers RO4003C (ε_r= 3.38, tan δ = 0.0027) grounded substrate of thickness 1.524 mm.

Simulation results The AMC unit cell exhibits ± 90° reflection phase band centered at 3.3 GHz with a bandwidth of 240 MHz and at 5.5 GHz with a bandwidth of 160 MHz as shown in the figure.

Simulation results The reflection coefficient was below -10 dB from 2.7 to 6.55 GHz of the CPW-fed monopole antenna alone and from 2.62 to 6.35 GHz of the antenna with AMC, as shown in the figure. The distance between the antenna and AMC is optimized to be H = 12.5 mm in order to maintain the frequency bandwidth of the original antenna.

Simulation results The simulation analysis shows that, the CPW-fed monopole antenna gain increased significantly after using the AMC array as a reflector plane, with a gain enhancement of 6.0 dBi and 3-dB gain bandwidth over 2.16-6.0 GHz with a maximum gain of 9.37 dBi.

Simulation results E-plane H-plane (b) E-plane H-plane The figure shows the simulated E-plane and H-plane radiation patterns at a chosen frequency f = 5.8 GHz of the antenna alone and with AMC. With the use of AMC, front-to-back ratio is improved by about 15 dB.

Conclusion The design of a CPW-fed wideband monopole antenna over a novel geometry of a dual-band artificial magnetic conductor has been presented in terms of reflection coefficient, gain and radiation pattern. The novel geometry of the AMC consist of an U-slot loaded square printed patch operate in a dual-band. The new AMC array preserve the antenna impedance bandwidth with the optimization of the distance between the antenna and the AMC reflector plane.

Conclusion A significant improvement in the antenna gain has been achieved with an enhancement of 6.0 dBi. A 3-dB gain bandwidth over 2.16-6.0 GHz, with a maximum gain of 9.37 dBi. With the use of AMC, front-to-back ratio is improved by about 15 dB.

Thank you Questions?