Abhijyoti Ghosh

Rectangular Microstrip Antenna on Slot-Type Defected Ground for Reduced Cross-Polarized Radiation

A simple rectangular microstrip antenna on slot-type defected ground plane is proposed for reduced cross-polarized (XP) radiation and justified theoretically. This will reduce the XP radiation field compared to a conventional microstrip antenna without affecting its copolarized (CP) radiation characteristics.

Physical and Quantitative Analysis of Compact Rectangular Microstrip Antenna with Shorted Non-Radiating Edges for Reduced Cross-Polarized Radiation Using Modifi ed Cavity Model

A straightforward and compact rectangular microstrip antenna with a shorted nonradiating edge was proposed and experimentally investigated for significant suppression of cross-polarized (XP) radiation compared to maximum co-polarized gain, without affecting the co-polarized radiation pattern. The proposed antenna was thoroughly studied using simulation and experimental results. A modified cavity model (MCM) was also demonstrated to understand the behavior of the cross-polarized radiation and the complete resonance behavior for the new structure. The proposed theory helps to germinate a real and clear view of the observed phenomena. The proposed idea was experimentally confirmed with the present structure on three different substrate materials, with different dielectric constants. The new approach presented here provides an insightful visualization-based understanding of cross-polarized suppression with the present structure.

Improved Cross-Polarized Radiation and Wide Impedance Bandwidth From Rectangular Microstrip Antenna With Dumbbell-Shaped Defected Patch Surface

Rectangular patch with dumbbell-shaped defected patch surface has been studied theoretically and experimentally to improve polarization purity over wide angular range and broad impedance bandwidth. More than 30 dB co- to cross-polarization (CP-XP) ratio over entire angular range around the broadside direction with wide impedance bandwidth is obtained. Moreover, the present structure is free from back radiation in terms of XP fields, and it can efficiently suppress the XP radiation in different diagonal planes. The present structure is very simple and easy to manufacture. The present investigation provides an insightful visualization-based understanding of concurrent improvement in impedance bandwidth and the XP radiation characteristics with the present structure.

Rectangular microstrip antenna with defected patch surface for improved polarization purity

A simple and compact rectangular microstrip antenna with circular arc defected patch surface is proposed for significant suppression of cross polarized (XP) radiation and improved polarization purity. The proposed antenna has been studied methodically with theoretical justifications. Simulation and experimental results are also presented in support of the present idea. The proposed structure is simple and easy to fabricate. Around 25 dB of XP radiation isolation from co polarized (CP) radiation is revealed. The effect of dimensions of the defect on the radiation performance of the proposed antenna has been thoroughly examined and verified. The exploration of the new structure is carried out with a view to eliminate higher order orthogonal resonance without altering its dominant mode field configuration.

Cross type defected ground structure integrated microstrip antenna: a novel perspective for broad banding and augmenting polarization purity

Abstract A simple cross type defected ground structure (CDGS) integrated rectangular microstrip antenna (RMA) has been proposed to achieve broad bandwidth along with augmented (improved) co-polarized to cross-polarized radiation (CP-XP) isolation over principal and diagonal planes. In this design, a crucial emphasis is given for concurrent improvement of both bandwidth and polarization purity of microstrip antenna without hampering dominant mode fields. Around 25–28 dB CP-XP isolation is achieved over wide elevation angle with the proposed structure with 25% impedance bandwidth. The simulated and measured results show a close resemblance with each other. The proposed geometry is very simple, easy to fabricate and therefore helps in effortlessness manufacturing process. Therefore, the present structure appears to be ideal in numerous applications where polarization purity is the key issue over the wide bandwidth.

Rectangular microstrip antenna with cross headed dumbbell defected patch surface for improved polarization purity

A simple and compact rectangular microstrip antenna with cross headed dumbbell defected patch surface is proposed for noteworthy suppression of cross polarized (XP) radiation, eliminating higher order orthogonal resonance without altering its dominant mode field configuration. The proposed antenna has been studied experimentally with theoretical justifications. More than 28 dB of XP radiation isolation from peak co polarized (CP) radiation is revealed.

Accurate CAD formulation for resonant frequency of circular sectorial microstrip antenna

The precise operating frequency of the circular sectorial microstrip antenna (CSMA) is the most significant parameter to be determined in order to design such antenna system to achieve the optimum performance. In the present investigation an improved computer aided design (CAD) formula is proposed for accurate determination of the resonant frequency of circular sectorial microstrip antenna. The theoretical results are verified with high frequency structure simulator (HFSS), and earlier reported results and good agreement is exposed.