A compact UWB G‐shaped printed monopole antenna with reconfigurable band‐notched characteristic is presented. The antenna design having a low profile of 8 × 27.5 mm2 consists of a G‐shaped radiating element size of 8 × 8 mm2 fed by a microstrip transmission line with a matching line and a defected ground structure. In order to achieve reconfigurable characteristic, a pin diode is inserted between the poles of G‐shaped radiator. When the pin diode is at ON‐state, G‐shaped patch behaves like a ring radiator and the antenna thus operates at whole UWB frequency. On the other hand; when the pin diode is at OFF‐state, the antenna has a band‐notched characteristic corresponds to C‐band and WIMAX band spectrum. The antenna design is parametrically investigated and the proposed design is verified by a prototype. From the measured results, the antenna has switchable characteristic between whole UWB spectrum of 2.8‐12.6 GHz at ON‐state and stopped band of 3.5‐4.95 GHz at OFF‐state. Therefore, the proposed antenna excels in terms of geometry's simplicity, compactness, near omnidirectional pattern, high efficiency as well as band‐notched configurability.

In this paper, a new broadband patch antenna design for fifth-generation (5G) sub-6 GHz mobile systems is presented. The proposed 5G antenna has a very compact size with an overall dimension of 10.7 × 22.5 mm 2. The 5G antenna consists of a log-periodic patch in the form of an equilateral triangle with a 50 Ω microstrip line feed and a ground plane of rectangular shape. The prototype of the proposed 5G antenna was made by etching on an FR4 substrate with a 1.6mm thickness, 4.3 dielectric constant and 0.02 tangent loss. The 5G antenna is designed and simulated for the frequency band range of 3.4-4.2 GHz. According to the measurement results, the 5G antenna impedance band range is determined as 3.1-3.9 GHz. Besides, the proposed 5G antenna has also near-omnidirectional radiation patterns both simulation and measurement at the resonance frequencies of 3.8 GHz and 3.5 GHz, respectively. According to these results, the proposed antenna is showed similar radiation characteristics in both measured and simulated results. With all these radiation and physical properties, the proposed log-periodic patch antenna is very suitable for sub-6 GHz 5G mobile applications.

An ultra-wideband (UWB) monopole microstrip antenna is designed in this study. The design consists of a radiating triangular patch antenna (TPA) fed through a 50 Ohm microstrip transmission line (MTL) constructed over a defected ground structure (DGS). The triangular monopole well is matched to MTL with inserting a thin strip line. The performance of the proposed antenna is numerically investigated using method of moments (MoM) and verified through measurements. Based on the measured results, the antenna operates over large frequency range of 2.6-18.2 GHz at -10 dB. This makes the design suitable for UWB applications. The proposed antenna has better characteristics in terms of radiation pattern, peak gain and total efficiency across the operating ultra-wideband frequency range. Furthermore, the antenna system is suitable for near-millimetre wave applications, since the operating band reaches to 18.2 GHz.

In this study, a wideband low profile microstrip antenna design for C-band applications is presented. The proposed antenna consists of a monopol log periodic patch in the equilateral triangular dimensions with the microstrip line fed and a rectangular ground plane. The antenna has 9×19.8 mm2 overall size, thickness of 1.6 mm and 4.3 dielectric constant. According to the simulation results, the proposed antenna has a very wide bandwidth while operating in the frequency band of 4.25-7.95 GHz and 5 GHz resonance frequency. The proposed antenna was also prototyped on FR4 substrate with the 0.02 tangent loss and the measurement results were quite similar by the simulated results.

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