# Performance Study of Defected Ground Structure Patch Antenna with Etched psi (ψ) Shaped Stubs

• Nadeem, Iram (Department of Information and Communication Engineering, Chosun University) ;
• Choi, Dong-You (Department of Information and Communication Engineering, Chosun University)
• Accepted : 2018.10.24
• Published : 2018.12.31
• 231 13

#### Abstract

In this article, a novel design of patch antenna with wide band characteristics is presented. The proposed antenna is having electrical dimensions of $0.14{\lambda}{\times}0.11{\lambda}$ (at lower initial frequency) and footprints of $150mm^2$. Structural parameters optimization shows 3.1-23.5 GHz frequency range for a (reflection coefficient) $S_{11}{\leq}-10dB$ and simulated gain 6.8 dB is obtained. An equivalent circuit model is proposed to get an insight view of antenna. Advanced Systems Design (ADS) simulation results are obtain which confirm the validity of proposed model. Degenerated foster canonical form has been used to explain the reactance and capacitive behavior idea of simulated proposed antenna's input impedance later on an equivalent circuit model and smith chart is also suggested. HFSS and CST have been used to analyze antenna behavior. The proposed antenna can be further used for microwave image detection applications.

#### File

Fig. 1. Antenna geometry (a) front side and (b) back side.

Fig. 2. Simulated current distributions at resonant frequency 7.9 GHz front side (a) and back side (b).

Fig. 3. Simulated input impedance of the proposed antenna (HFSS only).

Fig. 4. Equivalent circuit model of the proposed antenna.

Fig. 5. Impedance (red line) of the proposed antenna depicted on smith chart (obtained from ADS tool).

Fig. 6. Manufactured proposed antenna (a) front side and (b) back side.

Fig. 7. Simulated and measured reflection coefficients vs. frequency.

Fig. 8. Quality factor of the proposed antenna determined using the two methods, (14) and (15).

Fig. 9. Simulated radiation efficiency and peak gain.

Fig. 10. Simulated group delay (ns) and front to back ratio vs frequency.

Fig. 11. Simulated radiation pattern at (a) 4.9 GHz, (b) 9.8 GHz, (c) 14 GHz and measured radiation pattern at (d) 4.9 GHz, (e) 9.8 GHz, (f) 14 GHz resonance frequencies of the proposed antenna.

Fig. 12. General setup of patch antenna proposed for image detection.

Table 1. Optimized dimensions of proposed antenna

Table 2. Performance comparison of proposed antenna

#### Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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