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In this paper, a novel design for wideband high gain Right Hand Circular Polarized (RHCP) 2×4 array antenna at L-Band is presented for data link application. The proposed antenna used for long range highly maneuvering vehicles like missiles which needs high gain and RHCP to provide sufficient link margins. Orthogonal feeding is used for first patch and second patch is electromagnetically coupled to...
In this paper, design of broadband cylindrical cavity backed slot antenna for S-band telemetry system is presented. The antenna is designed using printed slot, excited by an open microstrip line. The slot is backed by a cylindrical cavity of reduced height 0.12 lambda. The antenna is integrated with Teflon radome for protection against environmental severities. The antenna has been designed for 2...
Slotted waveguide array antennas find wide applications in many microwave and radar systems requiring narrow beam and low side lobe level. Light weight, geometric simplicity, high power, limited scan volume and reliability make waveguide slotted arrays very useful for airborne radar application. A Miniature Ku-Band monopulse slotted waveguide array antenna in quarter height waveguide configuration...
In this paper, wideband circularly polarized stacked microstrip antenna in C-band with broad beam width for ground system of two way data link application has been proposed. This antenna is useful for surface to air communication like aircraft and missile applications. The proposed antenna has been analyzed using the FEM-based HFSS software. It is designed with different layers of dielectric substrates...
This paper presents the design of gap-coupled series fed antenna array with improved bandwidth. The series-fed array is designed using ‘U’ shaped microstrip feed lines and parasitic elements gap-coupled to non-radiating edges of the central elements. The fabricated 3 element gap-coupled series-fed array has VSWR <2 bandwidth of 5.5%, achieving 3 times improvement in bandwidth as compared to conventional...
In this paper, a novel design of 4×1 broadband circularly polarized active antenna array is proposed for telemetry signal reception. The antenna array is designed using electromagnetically coupled microstrip radiating elements and consists of bias tee and low noise amplifier. The 4×1 antenna array has broad VSWR < 2 bandwidth of 9.5% and axial ratio < 6 dB bandwidth of 7.5% at 2.2 GHz. The 4×1...
In this paper, design of broadband microstrip line fed cavity backed slot antenna with very small cavity height of 0.08 lambda is proposed. The antenna is designed for 1.8 GHz frequency band with wider beam coverage in E-plane. Parametric analysis of antenna is carried out to optimize antenna design for smaller cavity height, broad bandwidth and wider beam coverage. The radiation characteristic of...
A Frequency reconfigurable antenna using RF MEMS technology is presented in this paper. The antenna is designed to achieve reconfigurability within the band i.e. Intraband (S-band). The shift in frequency was obtained by changing the dimension of the patch (along the radiating edge) with the help of the stub. RF MEMS based Ohmic contact (metal to metal) series switch which was placed between the main...
This paper describes the design and test results of a noval X+Ku band monopulse antenna configuration suitable for a miniature on-board radar. The ku band antenna is a conventional five layer slotted waveguide array monopulse construction. The slots are printed on the ground plane of X-band printed monopulse array. The X-band printed array is realized as a single-layer print on top of slotted array...
A miniature DDS-based FMCW radar has been realized with dynamic range as high as 80 dB. A FMCW radar has many application as on-board sensor. The FMCW radar is a precision range measuring instrument. Hence it can be used for a variety of applications in aircrafts, helicopters and missiles. This paper describes in brief the design of one unique system which has been designed to operate in various modes...
A highly efficient monopulse comparator and feed network has been realized for a W-band trans-twist reflect-array that performs the dual role of focusing the beam and twisting the polarization. An split-E-plane waveguide assembly of four ring hybrids acts as a monopulse comparator network. It is precceded by a planar transition and a quad-waveguide axial transition. A multi-mode corrugated horn was...
A Ku-band microstrip monopulse array design and performance is discussed in the following paper, wherein 32% antenna efficiency is achieved at higher end Ku-band frequency. The printed array is realized on a single layer of low loss dielectric material. The monopulse comparator, series power divider and array design is described in brief. The design has been carried out using a combination of moment...
A W-band trans-twist reflect-array that performs the dual role of focusing the beam and twisting the polarization by 90° is realized using formulations of moment method in spectral domain. An array comprising of around 6000 patches is designed at W-band. The performance analysis and loss estimates are carried out. A multi-mode corrugated horn was designed as a feed for the reflect-array. An E-plane...
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