Design and development of a low profile, compact, wide beam and wide band printed double layered ... more Design and development of a low profile, compact, wide beam and wide band printed double layered exponentially tapered slot antenna (DTSA) with a coplanar waveguide (CPW) feed meant for wide scan active phased array antenna in X-band has been presented. DTSA satisfies the requirements on the maximum reflection coefficient of Γ ≤ −10 dB for ±60 • and ±45 • scan from broadside in H-and E-planes, respectively with a moderate gain of 4–7 dBi. Realized antenna has shown a symmetric pattern together with moderately high gain, low cross-polarization and 3 dB beam width better than ±60 • and ±45 • in H-and E-planes, respectively. The designed structure is expected to find applications in mounting platforms with limited RF real estate available to it like in military aircrafts, owing to its easy integration with the uni-planar monolithic millimeter-wave integrated circuits.
This article proposes a new design of wideband wide beam microstrip like antenna (MLA) in X-band ... more This article proposes a new design of wideband wide beam microstrip like antenna (MLA) in X-band (8-12 GHz) overcoming the limitations of conventional MLA design. The waveguide is filled with a dielectric material, which is shaped beyond the waveguide aperture as a pyramidal structure. This helped in achieving the size reduction of the waveguide and matching of aperture admittance over the complete operational band. Also a vertical electric dipole feed design is proposed to excite MLA and match the source and load admittances. The input reflection coefficient observed over the complete band is better than -10 dB. The measured gain and cross polar level of antenna achieved are better than 4 dBi and -18dB across the bandwidth, respectively. The measured and the simulated results are in good agreement.
ABSTRACT This paper presents design and development of a light weight and low profile microstrip ... more ABSTRACT This paper presents design and development of a light weight and low profile microstrip antenna array meant for a ground based surveillance radar. The array has been configured to form shaped and narrow beams in elevation and azimuth planes, respectively. Array has performed satisfactorily producing a minimum gain of 24 dB and sidelobe level of -25 dB in azimuth plane and shaped beam coverage beyond 30deg in elevation plane over a 15% bandwidth in L-band.
ABSTRACT Advanced radar programs use low sidelobe, wide angle scan active aperture arrays over a ... more ABSTRACT Advanced radar programs use low sidelobe, wide angle scan active aperture arrays over a broad bandwidth to ensure the frequency agility and ECCM requirements of modern day radar systems. The design of such a high performance, cost effective active aperture array within the weight, size and volume constraints is very critical right from choosing the array grid architecture, radiating element structures and array feed networks. The microstrip antenna array presented in this paper has been proposed to be used on an airborne large size active phased array aperture, with all these design constraints / criticalities satisfied.
ABSTRACT A simple and accurate CAD technique for the synthesis of wideband printed transmission l... more ABSTRACT A simple and accurate CAD technique for the synthesis of wideband printed transmission line transformers (TLTs) is being presented in this article using an evolutionary technique, namely, particle swarm optimisation (PSO). The design procedure is formulated as a global non-linear optimisation problem by defining a suitable cost function. The proposed theory has been validated with commercial circuit simulator Agilent's Advanced Design System software and compared with few measured results.
ABSTRACT Advanced Radar Programs use low sidelobe, wide angle scan active aperture arrays over a ... more ABSTRACT Advanced Radar Programs use low sidelobe, wide angle scan active aperture arrays over a broad bandwidth to ensure the frequency agility and ECCM requirements of modern day radar systems. The design of such a high performance, cost effective active aperture array within the weight, size and volume constraints is very critical right from choosing the array grid architecture, radiating element structures and array feed networks. The microstrip antenna array presented in this paper has been proposed to be used on an airborne large size active phased array aperture, with all these design constraints/ criticalities satisfied.
ABSTRACT An accurate full wave spectral domain technique is developed to evaluate the characteris... more ABSTRACT An accurate full wave spectral domain technique is developed to evaluate the characteristic parameters of high-temperature superconducting (HTS) microstrip antennas (MSA). The analysis takes into account most of the practical operating conditions affecting the performance of MSA. A corresponding study of copper (Cu)-MSA has also been carried out to visualize the advantage of HTS-MSA over its normal counterpart.
Design and development of a low profile, compact, wide beam and wide band printed double layered ... more Design and development of a low profile, compact, wide beam and wide band printed double layered exponentially tapered slot antenna (DTSA) with a coplanar waveguide (CPW) feed meant for wide scan active phased array antenna in X-band has been presented. DTSA satisfies the requirements on the maximum reflection coefficient of Γ ≤ −10 dB for ±60 • and ±45 • scan from broadside in H-and E-planes, respectively with a moderate gain of 4–7 dBi. Realized antenna has shown a symmetric pattern together with moderately high gain, low cross-polarization and 3 dB beam width better than ±60 • and ±45 • in H-and E-planes, respectively. The designed structure is expected to find applications in mounting platforms with limited RF real estate available to it like in military aircrafts, owing to its easy integration with the uni-planar monolithic millimeter-wave integrated circuits.
This article proposes a new design of wideband wide beam microstrip like antenna (MLA) in X-band ... more This article proposes a new design of wideband wide beam microstrip like antenna (MLA) in X-band (8-12 GHz) overcoming the limitations of conventional MLA design. The waveguide is filled with a dielectric material, which is shaped beyond the waveguide aperture as a pyramidal structure. This helped in achieving the size reduction of the waveguide and matching of aperture admittance over the complete operational band. Also a vertical electric dipole feed design is proposed to excite MLA and match the source and load admittances. The input reflection coefficient observed over the complete band is better than -10 dB. The measured gain and cross polar level of antenna achieved are better than 4 dBi and -18dB across the bandwidth, respectively. The measured and the simulated results are in good agreement.
ABSTRACT This paper presents design and development of a light weight and low profile microstrip ... more ABSTRACT This paper presents design and development of a light weight and low profile microstrip antenna array meant for a ground based surveillance radar. The array has been configured to form shaped and narrow beams in elevation and azimuth planes, respectively. Array has performed satisfactorily producing a minimum gain of 24 dB and sidelobe level of -25 dB in azimuth plane and shaped beam coverage beyond 30deg in elevation plane over a 15% bandwidth in L-band.
ABSTRACT Advanced radar programs use low sidelobe, wide angle scan active aperture arrays over a ... more ABSTRACT Advanced radar programs use low sidelobe, wide angle scan active aperture arrays over a broad bandwidth to ensure the frequency agility and ECCM requirements of modern day radar systems. The design of such a high performance, cost effective active aperture array within the weight, size and volume constraints is very critical right from choosing the array grid architecture, radiating element structures and array feed networks. The microstrip antenna array presented in this paper has been proposed to be used on an airborne large size active phased array aperture, with all these design constraints / criticalities satisfied.
ABSTRACT A simple and accurate CAD technique for the synthesis of wideband printed transmission l... more ABSTRACT A simple and accurate CAD technique for the synthesis of wideband printed transmission line transformers (TLTs) is being presented in this article using an evolutionary technique, namely, particle swarm optimisation (PSO). The design procedure is formulated as a global non-linear optimisation problem by defining a suitable cost function. The proposed theory has been validated with commercial circuit simulator Agilent's Advanced Design System software and compared with few measured results.
ABSTRACT Advanced Radar Programs use low sidelobe, wide angle scan active aperture arrays over a ... more ABSTRACT Advanced Radar Programs use low sidelobe, wide angle scan active aperture arrays over a broad bandwidth to ensure the frequency agility and ECCM requirements of modern day radar systems. The design of such a high performance, cost effective active aperture array within the weight, size and volume constraints is very critical right from choosing the array grid architecture, radiating element structures and array feed networks. The microstrip antenna array presented in this paper has been proposed to be used on an airborne large size active phased array aperture, with all these design constraints/ criticalities satisfied.
ABSTRACT An accurate full wave spectral domain technique is developed to evaluate the characteris... more ABSTRACT An accurate full wave spectral domain technique is developed to evaluate the characteristic parameters of high-temperature superconducting (HTS) microstrip antennas (MSA). The analysis takes into account most of the practical operating conditions affecting the performance of MSA. A corresponding study of copper (Cu)-MSA has also been carried out to visualize the advantage of HTS-MSA over its normal counterpart.
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Papers by Ashutosh Kedar