Higher Order Mode Attenuation in Microstrip Patch Antenna with DGS H Filter Specification from 5 to 10 GHz Range

Souza, Francisco Ary Alves de; Campos, Antonio Luiz Pereira de Siqueira; Gomes Neto, Alfredo; Serres, Alexandre Jean René; Albuquerque, Camila Caroline Rodrigues de

doi:10.1590/2179-10742020v19i2823

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Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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Article • J. Microw. Optoelectron. Electromagn. Appl. 19 (2) • June 2020 • https://doi.org/10.1590/2179-10742020v19i2823 copy

Higher Order Mode Attenuation in Microstrip Patch Antenna with DGS H Filter Specification from 5 to 10 GHz Range

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This work proposes the application of a slot in the ground plane, Defected Ground Structure (DGS), of a microstrip patch antenna. The application of this technique aims to attenuate higher-order excited modes without deteriorating the antenna parameters in the fundamental mode. The methodology for the design of the slot in H-format is presented, based on the physical dimensions of the microstrip patch antenna. The positioning of the DGS concerning the feed line was determined from a detailed parametric analysis. The antenna was designed for the fundamental mode at 2.45 GHz frequency. Two antenna prototypes were built, with and without DGS, and measurements of reflection coefficient, gain, and radiation pattern were performed. The measured results show that the application of DGS considerably attenuated higher-order excited modes. A good agreement between simulated and measured results is achieved.

Index Terms
DGS; Microstrip Antenna; Higher order suppression

Reference number	Fundamental frequency (GHz)	Higher-order modes suppressed	Technique	DGS area/ $λ_{0}^{2}$
[²[2] M. H. Chang et al., “Microstrip-fed ring slot antenna design with wideband harmonic suppression,” IEEE Transactions on Antennas and Propagation, vol. 62, no. 9, pp 4828–4832, 2014.]	2.45	3	Ring and inverted U-shape DGS	0.058
[⁴[4] S. Biswas, D. Guha, and C. Kumar, “Control of higher harmonics and their radiations in microstrip antennas using compact defected ground structures,” IEEE Transactions on Antennas and Propagation, vol. 61, no. 6, pp 3349–3353, 2013.]	3.11	6	Partial ring DGS and stub	0.063
[⁵[5] U. Pattapu, S. P. Biswal, and S. Das, “A 2.45 GHz DGS based harmonic rejection antenna for rectenna application,” Proc. 2017 USNC-URSI Radio Science Meeting, July, pp 123–124, 2017.]	2.45	1	Rectangular and loop DGS	0.032
[⁷[7] F. C. B. Sena and J. P. Silva, “Harmonic suppression using optimised hexagonal defected ground structure by genetic algorithm,” IET Microwaves, Antennas & Propagation, vol. 12, no. 10, pp 1645–1648, 2018.]	5.80	2	Multiple hexagonal DGS	0.031
[⁸[8] A. Rahim et al., “A Harmonic Suppression Circular Disk Microstrip Patch Antenna at the 2.45 GHz Frequency,” Proc. 2014 IEEE Colloquium on Humanities, Science & Engineering Research, April, pp 1–5, 2014.]	2.45	2	5 non-uniform rectangular slots and stub	0.010
[⁹[9] P. R. Prajapati, “Application of defected ground structure to suppress out-of-band harmonics for WLAN microstrip antenna,” International Journal of Microwave Science and Technology, pp 1–9, 2015.]	2.45	2	H-format DGS	0.009
[¹⁰[10] J. Acharjee et al., “Suppressing up to fourth harmonic of an ISM band microstrip patch antenna using compact defected ground structures,” Microwave and Optical Technology Letters, vol. 59, no. 9, pp 2254–2259, 2017.]	2.45	8	2 I-format DGS and L-format stub	0.014
Present	2.45	7	H-format DGS	0.007

Dimensions in mm
Patch	Wp	37.26
Patch	Lp	28.83
Ground plane	W_g	49.22
Ground plane	L_g	40.79
Microstrip line	L_f	15.16
Microstrip line	W_f	3.20
Inset-fed	Y_w	0.80
Inset-fed	Y ₀	9.18

Dimensions in mm
Lateral bars	W_h	2.295
Lateral bars	L_h	9.180
Link bar	W_b	2.295
Link bar	L_b	2.295

Result	Antenna	\|S₁₁\| (dB)	Gain (dB)	BW (MHz)	VSWR	Z_in (Ω)
Simulated	Reference	−20	2.89	80	1.21	47.48 + j16.98
Simulated	Proposed	−24	2.87	80	1.12	51.83 + j0.08
Measured	Reference	−14	2.89	77	1.45	44.60 + j16.70
Measured	Proposed	−22	2.80	80	1.16	52.65 + j8.41

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