A miniature broadband Vivaldi antenna with beam tilt characteristics suitable for lower 5G bands is presented in this article. This study is rationalized by adding two symmetric taper slots rotated 90° from the original single slot planar tapered antenna and by means of positive‐intrinsic‐negative diode as the switching component. The extended design with a cloverleaf shape is developed using computer simulation technology microwave studio and fabricated by integrating active MA4AGP907 diodes. The experimental results are validated using PNA network analyzer and an echoic chamber. A wide operating bandwidth (S11 ≤ |−10| dB) from 2 to 5 GHz is exhibited during the simulation of antenna performance as well as during the experimental process. Furthermore, the proposed design achieved beam tilt in three different orientations with the maximum at ϕ equals 0°; 90° and 180° in the XY coordinates at the peak gain of 5.19 dBi. An additional feature of the proposed design is the directivity control when two or three modes are switched simultaneously. With this beam tilt ability, the antenna can be used in the development of fifth generation communication systems where multibeam and directive beam are required.

Vivaldi antenna has b een considered as a mitigation to the scattering effect of an antenna. However, the current performance of Vivaldi antenna suffers from multipath effect, interfering signals and radiation pattern control. This paper proposed an improved Vivaldi antenna which combined triple radiating slot to enab le control of radiation pattern features. This is accomplished b y controlling the position of the radiating element through the asymmetric arrangement of ideal switches to steer the b eam in three desired-directions. The Using operating frequency lied b etween 900 MHz and 2.5GHz, the proposed design was fab ricated and tested. Depending on the radiating element, the proposed anten na covered ab out ±90º with an almost equal gain at the three different focal in contrast to ±45º coverage of traditional rectangular microstrip antenna b eam. The results satisfied pattern reconfigurab ility and the proposed design can b e very useful for wireless communications where multipath fading prob lems are frequently encountered.

<p>A wideband tapered slot antenna (TSA) with three radiating elements for beam switching purpose is proposed in this study. The integrated radiating taper slots in assistance with metal strips acting as switches provided the proposed design with the capability of switching its beam into three different directions while maintaining the antenna performance stable. To validate the accuracy of the proposed design, the prototype was fabricated and measurements were conducted in terms of reflection coefficient (S11), radiation pattern and realized gain towards the three different operating modes. By sequentially, activating the switches, the antenna main beam rotated 90º in the XY coordinates. A realized gain ranging from 4.3 to 6.4 dBi and a wide operating bandwidth (|S11| ≤-10dB) from 3.3 GHz to 5 GHz  were observed throughout the antenna performance in simulation as well as in experiment. With the covered bands, the proposed antenna can be suitable for Sub -6GHz wireless communications systems. Improvements of Trapezoid Antenna Gain using Artificial Magnetic Conductor and Frequency Selective Surface.</p>

A new concept of antenna which quantifies the potential gain of pattern and frequency control in order to suit the requirements of wireless applications such as body area network is presented in this paper. The proposed antenna ranges from 3 GHz to 6 GHz for a wideband operation and operates at 3.5 GHz for a narrowband operation. It uses two types of feedings (CPW and Slotlines) for pattern control with integrated ring resonators for the switching of wideband operation to narrowband operation while maintaining the polarization. The upright return loss characteristics, the controlled radiation pattern and great bandwidth demonstrated at the resonant frequencies make this antenna suitable for applications in these fields.