In this article, a novel design of a planar antenna with modified patch and defective ground plane for UWB applications is presented. The optimum dimension of the antenna is 20 × 25 × 1.5 mm3 and it is fabricated on commercially available low‐cost FR‐4 substrate having relative permittivity (εr = 4.3) and relative permeability (μr = 1) with a loss tangent of 0.025. The impedance bandwidth of the proposed antenna (magnitude of S11 [S11 < −10 dB]) is 110% (3.1‐10.8 GHz). The peak gain and the peak radiation efficiency of the proposed antenna is 5.1 dB and 89%, respectively, in the proposed band of operation. Simulated and measured results of the proposed antenna are in good agreement. The proposed antenna is suitable for ultra‐wideband applications, 3.5/5.5 GHz WiMAX band, 5.2/5.8 GHz WLAN band, 4/6 GHz satellite communication, and various other wireless communication applications.

A compact ultrawideband planar antenna with modified circular patch and a defective ground plane for multiple applications is presented. The proposed structure consists of a modified circular patch and rectangular parasitic elements with defective ground plane etched on flame retardant (FR‐4) substrate with 50 Ω feed line. Return loss (S11 < −10 dB) and the simulated bandwidth of the structure was 2.5 to 12.2 GHz with the fractional bandwidth of 131%. The overall volume of the structure had a compact size of 15 × 19 × 1.6 mm3. The gain of the structure is 3.5 dB, and the antenna efficiency is 73.5%. The structure radiated (stable radiations) omnidirectional and bidirectional patterns. Measured and simulated results of Co‐ and Cross‐polarizations. are in relatively good agreement. All these properties shows that the proposed structure is applicable in WiMAX‐band 3.5, 5.5 GHz, WLAN‐band 5.2, 5.8 GHz, X‐band8‐12 GHz, data links to satellites along with various applications in the wireless communication field.

In this article, a dumbbell shaped microstrip broadband microstrip antenna with partial ground plane is presented, The overall dimension of the proposed antenna is 20 x 15 x 1.5 mm 3 and is fabricated on FR4 substrate which has electrical permittivity of 4.3 and loss tangent of 0.025. FR4 is a low cost and easily available. The thickness of the substrate is 1.5 mm. The impedance bandwidth of the proposed antenna is 151.11 % (3.48 GHz to 25 GHz). The peak gain and radiation efficiency of the proposed antenna are 4.5 dB and 68 % respectively in the operating frequency band. Due to introduction of rings on the edges of the octagon and cutting of circular slots with the rectangular slits in the ground plane the antenna starts resonating from 3.48 GHz to 25 GHz. Simulated results are in good agreement with the measured results. The proposed antenna covers partial frequency range for ultra-wide band applications, 3.5/5.5 GHz WiMAX band, 5.2/5.8 GHz WLAN band, 8/12 GHz X-band, 12/18 GHz Ku-band. It can be used in space and satellite communications etc. Curves of radiation pattern and S-parameter of both simulated and measured results are shown. The impedance curves, surface current, radiation efficiency, simulated return losses, gain, and radiation patterns of the proposed antenna are described in the paper.

This paper presents a miniaturized dual-band antenna with a rectangular patch and symmetrically placed circles in the partial ground plane. The dimensions of the proposed antenna are 15 * 20 * 1.5 mm 3 , and the antenna is excited by a 50 Ω microstrip line from the bottom. The proposed antenna is fabricated on the commercially available low-cost FR4 substrate having relative permittivity ε r = 4.3 and loss tangent 0.025. By introduction of a rectangular slot with a T-shape in the ground plane and a rectangular patch, the lower frequency band is achieved. The peak gain and radiation efficiency of the proposed antenna are 2 dB and 78%. The proposed antenna operates at 2.846 GHz to 3.24 GHz and 4.05 GHz to 6.22 GHz frequency range. The antenna finds its application in S-band, 5.5/5.8 GHz WiMAX bands, and 4.9/5/5.9 GHz Wi-Fi bands.

In this article, a compact UWB planar antenna with corrugated ladder ground plane is presented. The antenna has a compact size of 15 × 20 × 1.5 mm3. The proposed antenna is fabricated on low cost, easily available FR‐4 substrate with relative permittivity εr = 4.3, permeability μ = 1, and loss tangent of 0.025. The thickness of the FR‐4 substrate is 1.5 mm. The impedance bandwidth of the proposed antenna (magnitude of S11 <−10 dB) is 130.4% (2.4‐11.4 GHz). The peak gain of the proposed antenna is 3.5 dB and the peak radiation efficiency of the proposed antenna is 76%. Stable omnidirectional radiation patterns (H‐plane) and bidirectional radiation patterns (E‐plane) are observed in the entire operating frequency range. One side of the antenna with corrugated ladder ground plane results in the reduction of operating frequency of the proposed antenna and it reaches till 2.4 GHz whereas the other side of the antenna consist of the circular patch with a circular slot which results to resonant the proposed antenna in the higher operating band. With these properties, the proposed planar antenna is suitable for 2.4 (Wi‐Fi), 2.5/3.5/5.5 GHz (WiMAX) bands, 2.5/5.2/5.8 GHz (WLAN) bands, and other UWB wireless communication applications.