Faculty Publications

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Author: search.filters.author.Bhardwaj, D.Subject: search.filters.subject.Microstrip antenna

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    Radiation performance of an elliptical patch antenna with a circular for modern communication systems
    (2008) Bhardwaj, D.; Bhardwaj, V.; Bhatnagar, K.D.; Sancheti, S.
    The paper presents the radiation performance of an elliptical (a=15mm, b=10.5mm) patch antenna having circular slot (R=4.8mm) designed on glass epoxy FR4 substrate and its performance is compared with a simple elliptical patch antenna without slot. The simulation results for this antenna are obtained with available IE3D simulation software by varying semi major axis (a) and semi minor axis (b). The elliptical patch antenna with circular slot of specific radius not only resonates at two different frequencies but also presents a relatively wide bandwidth, higher directivity and enhancement of gain. By designing antenna on low permittivity substrate, a much higher bandwidth may be achieved. ©2008 IEEE.
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    Design and analysis of a gap coupled split circular patch with elliptical slot filled with elliptical patch
    (2010) Bhardwaj, D.; Sharma, K.; Bhatnagar, D.; Sancheti, S.; Soni, B.
    The paper presents radiation performance of a gap coupled split circular patch with elliptical slot filled with elliptical patch. Initially, a circular elliptical ring slot antenna is taken and it is modified step by step to achieve an end product with desired performance. The performance of designed antenna after each step is presented systematically. The simulated and measured results of proposed antenna are compared with that of a circular elliptical ring slot antenna. The gap between two gap-coupled semi circular elliptical ring structures and the length of major and minor axis of inserted inner elliptical patch are optimized to achieve best performance. It is observed that with proposed modifications in circular patch geometry, impedance bandwidth, gain and radiation efficiency of antenna are improved considerably. The resonance frequency of end product is lower than that of a circular elliptical ring slot antenna which indicates that for achieving identical resonance frequencies from circular elliptical ring slot antenna and modified circular patch geometry, effective patch size of modified antenna must be reduced. The outcome results into a further compact circular patch antenna with much improved performance.