In modern wireless communication systems, small circularly polarized microstrip antennas with good performance are desirable mainly at low microwave frequencies. The radio frequency identification (RFID) systems in the ultra-high frequency (UHF) band have gained much interest in many services [Finkenzeller2004]. The reader antenna is one of the important components in the RFID reader system and...

This Paper is an attempt to give an overview of Microstrip Spurline Band Stop Filter. The basic concepts and filtering characteristics of Microstrip Spurline Band Stop Filter are introduced and the equivalent circuit models with filter response are also presented. Also, the main applications of Microstrip Spurline Band Stop Filter in microwave technology field are summarized and the evolution t...

This paper presents the increase in bandwidth of a Microstrip Antenna using a simple slotted structure fed by Microstrip line. The main aim of proposed work is to obtain a large bandwidth antenna with reduced size. The proposed microstrip antenna has a wide bandwidth covering the range from 1.806-2.978 GHz. By using simple Microstrip Line feed wide bandwidth of 48.99% has been achieved. The pro...

-Wide band truncated rectangular microstrip antenna with H slot loaded and defected ground plane structure is presented in this paper to increase the bandwidth. It is found that the impedance bandwidth of a microstrip antenna could be enhanced considerably when a defected ground structure is used .The band width of a truncated rectangular microstrip antenna with H slot is 21.2% whereas after ad...

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...

Electromagnetic metamaterial is an artificial material that made up of different types structural designs on dielectric substrates. In this paper a broad and elite investigation being carried out by designing simulating cell comprising square split ring resonator with copper wire strip etched the ground plane to discover its some unusual parameters such as double negativity which are naturally ...

Reconfigurable ring filter based on single-side-access ring topology is presented. Using capacitive tuning elements, the electrical length of the ring can be manipulated to shift the nominal center frequency to a desired position. A synthesis is developed to determine the values of the capacitive elements. To show the advantage of the synthesis, it is applied to the reconfigurable filter design...

Conventional microstrip antennas in general have a conducting patch printed on a grounded microwave substrate, and have the attractive features of low profile, light weight, easy fabrication, and conformability to mounting hosts [1]. However, mi-crostrip antennas inherently have a narrow bandwidth, and bandwidth enhancement is usually demanded for practical applications. In addition, applicatio...

An electromagnetically coupled feed arrangement is proposed for simultaneously exciting multiple concentric ring antennas for multi-frequency operation. This has a multi-layer dielectric configuration in which a transmission line is embedded below the layer containing radiating rings. Energy coupled to these rings from the line beneath is optimised by suitably adjusting the location and dimensi...

in this note we introduce the notion of weak mccoy rings as a generalization of mccoy rings, and investigate their properties. also we show that, if is a semi-commutative ring, then is weak mccoy if and only if is weak mccoy.