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All-optical data processing technology has the strong potential to reach the goal of ultra fast data processing for the present and coming generation. But use of conventional binary logic based operation degrades the expected speed because of the limitation of data representation scheme based on only two states. A very promising approach to deal with enormous amount of data with a very high speed...
In the last few years, reversible logic gates have been used widely for developing various types of arithmetic and logic processors due to its low power consumption and dissipation. Researchers prefer reversible logic gates for designing several types of optical switching devices in all-optical communication network. The modern high speed network, based on the conventional irreversible logic gates,...
A high gain shared aperture dual-band dual-polarized (DBDP) patch antenna is proposed in this work. Dual polarization is obtained by exciting the antenna in two orthogonal directions using two separate ports. Higher order resonant mode is used to obtain higher gain. The antenna transmits and receives in L and S bands simultaneously with good isolation between the ports. Improved isolation is obtained...
In this work, a high gain dual-beam periodic leaky wave antenna is designed and fabricated in microstrip line technology. The antenna radiates in both top and bottom hemispheres of the substrate thus exhibiting a dual-beam radiation pattern. The beam scan range obtained is symmetrical about the broadside direction with a total scan range of ±22.5°. Maximum gain of 12.7 dB is obtained in the broadside...
In this paper, a dual-band bandpass filter is proposed in substrate integrated waveguide (SIW) technology. A single cavity that supports both TE101 and TE201 resonating modes is used for the design. The two passbands are created by the two modes. To improve the selectivity, one bypass coupling path is introduced which provides additional transmission zero. The procedures to control the passband center...
A cruciform directional coupler based on substrate integrated waveguide (SIW) technology is presented in this paper. The coupler is composed of crossover of two SIW sections, two inductive metallic posts and air slab in the central region. Design steps are provided. A prototype coupler has been fabricated for X-band operation. The coupler has a wide bandwidth of 40% at the center frequency of 10 GHz...
In this paper, a novel design of compact multi-band planar antenna is presented. Quarter-wavelength resonating slots are introduced on the radiating patch of a microstrip line fed monopole antenna. This arrangement provides reduced ground current effect. Moreover, ambient conditions like presence of nearby metallic structures, dielectric overlay, plastic casing, transceiver chips etc. are shown to...
A modulated width rectangular waveguide has been proposed to control the aperture illumination of a leaky-wave long slot antenna. It also offers wider scan coverage compared to its uniform counterpart. The prototype designed to operate at Ku-band shows a 33% increase in scan angle while the side lobe level is at least −13 dB from 12 GHz to 16 GHz in simulations and −10.5 dB in measurements. A simple...
This paper presents a design of broadband phase shifters using a slow-wave microstrip line structure. The slow wave structure is realized by placing periodic circular grounded metal patches below the top layer metal strip. The slow wave structure provides linear phase response over a wide range of frequency which is then utilized to design the broadband phase shifters. A set of graphs are presented...
A conventional transverse slot substrate integrated waveguide (SIW) periodic leaky wave antenna (LWA) provides a fan beam, usually E-plane beam having narrow beam width and H-plane having wider beamwidth. The main beam direction changes with frequency sweep. In the applications requiring a pencil beam, an array of the antenna is generally used to decrease the H-plane beam width which requires long...
In this paper, effects of different shapes of periodic slots etched on the broad wall of a via-less substrate integrated waveguide leaky wave antennas are presented. Different shapes of the slots namely circular, elliptical, rectangular and triangular are considered. A comparative performance study based on gain, radiation efficiency and scan range of the antenna for the different shapes is studied...
A compact and wideband branch line coupler is designed that covers all the navigation bands starting form xx GHz to yy GHz. A single-section coupler with series stubs, half-wavelength at the mid-band frequency f0, is considered to obtain the wideband operation. Moreover, a hybrid approach, using both transmission line sections and lumped elements, is used for the size reduction without compromising...
Electroplating on dielectric is used to realize continuous metallic side walls of a substrate integrated waveguide (SIW). Thus the complexity of fabricating chain of metallic via using precise mechanical or laser drilling used in conventional SIW fabrication is avoided. To show effectiveness of the procedure, a single cavity dual-mode bandpass filter is designed and fabricated. A modified corner cut...
Design of a microstrip fed double exponentially tapered Vivaldi antenna is presented for the 2–18 GHz ultra-wideband applications. Wideband operation is obtained by integrating a compact ultra-wideband balun with the antenna through an impedance transformer. Rectangular dimension of the feeding network including the balun and the matching section fabricated on a 0.813 mm thick RO4003C substrate is...
In this paper, a novel excitation technique by a commercially available SMA connector is presented for the empty substrate integrated waveguide (ESIW). The SMA connector is directly connected to one end of the ESIW. A prototype back-to-back transition is designed and fabricated for X-band operation. Measurement results show that the insertion loss of the back-to-back transition is below 1 dB over...
A dual-beam substrate integrated waveguide (SIW) periodic leaky wave antenna (LWA) is designed and fabricated. The dual-beam operation is obtained by using leakage from the side walls of the SIW. The two beams are mirror image of each other. The feeding arrangement is simple and the antenna as a whole is easy to fabricate. A backward end fire to forward end fire scanning range of almost 74° is obtained...
A compact planar configuration is presented for an ultra-wideband (UWB) transition between a microstrip line and a coplanar strip line (CPS). A single metallic via and a slot in the ground plane of a microstrip line are used to transform the microstrip mode into the CPS mode. Three prototype back-to-back transitions are fabricated on a 0.813 mm thick RO4003 substrate. The measured insertion losses...
In this paper, the variation of unloaded Quality factor QU of a substrate integrated waveguide (SIW) resonator with the substrate parameters is presented. It is observed that the QU strongly depends on substrate thickness, dielectric constant and loss tangent values. QU of a SIW resonator is also compared with that of a conventional rectangular air filled waveguide resonator and also that of a microstrip...
In this paper, the design of a compact orthomode transducer (OMT) using substrate integrated waveguide technology (SIW) is presented. The orthomode signals come from a square waveguide and are coupled to four SIW lines through four wide slots placed on the end wall of the square waveguide. The out-of-phase signals from each opposite slot pairs are combined using a simple planar configuration to provide...
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