Smart antenna is one way to solve the major problems of wireless and cellular communication, like multipath propagation and co-channel interference. The basic requirement of cellular communication is transmit signal only in desired direction rather than in Omni direction to minimize the interference and fading effect. Optimization of patch array antenna for cellular communication will be consid...

Microwave systems like radar, missile guidance and communication equipment which require large amplifiers to produce high power beam, wave-guides for its low loss and higher power capabilities and motors for scanning are bulky, occupy large space and are not easily routed. Most efficient replacements have been found in the active antenna array where active devices are integrated directly into t...

The current wireless cellular base station antenna system employs switched beam technology which suffers from its inefficiency to track the user and limited capacity. The Smart antenna technology which tracks the mobile user continuously by steering the main beam towards the user and at the same time forming nulls in the directions of the interfering signal. The development of smart antennas in...

The C-shaped microstrip antenna is a compact variation of rectangular microstrip antenna and it has smaller bandwidth as compared to the rectangular patch. In this paper, bandwidth of C-shaped microstrip antenna is first increased by using proximity feeding technique. Further gap-coupled configuration of two C-shaped microstrip antennas on thicker substrate is proposed. It gives bandwidth of mo...

The study of Microstrip patch antennas have made great progress in recent years. Compared with conventional antennas, Microstrip patch antennas have more advantages and better prospects. They are lighter in weight, low volume, low cost, low profile, smaller in dimension and ease of fabrication and conformity. Moreover, the Microstrip patch antennas can provide dual and circular polarizations, d...

In this paper, one 5 × 5 antenna array are studied. In each array, one probe-fed circularly polarized (CP) microstrip patch antenna is placed at the center as the driven antenna and is gapped coupled to the remaining elements. It is investigated that CP performance of the patch can be proved by properly arranging these parasitic elements. The driven patch is a perturbed square one with two diag...

The synthesis of steerable reflect-array antennas, as a synthesis of any antenna, should be realized by solving two problems: external antenna problem and internal antenna problem. The first one includes the investigation of the antenna radiation pattern. The second one concerns a design of the structure providing the required amplitude-and-phase distribution along the antenna aperture. The fir...

This paper covers two aspects of microstrip antenna design. The first is the analysis of trapezoidal patch microstrip antenna with V-shaped slot which operate at the centre frequency of 5.5 GHz. The second aspects are the analysis and design of inverted V-shaped slot cut trapezoidal microstrip antenna operates at centre frequency of 4.1 GHz. The simulation has been done through IE3D simulator. ...

The main objective of this chapter is to present to the readers a step-by-step design approach when designing antenna array. Subsequently, the chapter will proceed following an example design of a passive Ku band planner receive array antenna for direct broadcast from satellite (DBS) reception for mobile systems. First, an appropriate antenna topology capable of reaching our target goals will b...

The study of microstrip patch antennas has made great progress in recent years. Compared with conventional antennas, microstrip patch antennas have more advantages and better prospects. They are lighter in weight, low volume, low cost, low profile, smaller in dimension and ease of fabrication and conformity. Moreover, the microstrip patch antennas can provide dual and circular polarizations, du...