Substrate integrated waveguide (SIW) technology that combines 3D and 2D structures has been successfully utilized due to its notable advantages, including in application H-plane horn antennas. As this type of antenna is commonly constructed on thin substrates, the E-plane radiation pattern always wide, thereby limiting achievable gain performance. In work, we propose an approach incorporates pr...

We present in this paper an integrated ca ̈ity-backed patch antenna operating at 75 GHz. The design was optimized using a full-wa ̈e software based on the integral-equation method. The antenna was realized using micromachining technologies on two wafers: a silicon one supporting a membrane and a radiating patch, and a Pyrex one constituting the feeding element. The measurements are in good agreem...

Satellite broadcasting of UHDTV in Japan has used the 12-GHz band (11.7 to 12.75GHz) since 2018. The 21-GHz (21.4 22.0GHz) also been allocated satellite Europe, Africa, and Asia Pacific. BSAT-4a not only 12-GHz-band transponders for services, but 21-GHz-band experimental future services. To receive services using these two frequency bands with a single antenna, we designed 12- dual-band horn an...

The 440-Mcps conical-scan tracker at the Millstone Hill radar site has been converted to an L-band 12-horn monopulse tracker utilizing a Cassegrain optics reflector system. The amplitude sensing monopulse feed illuminates a 10-foot subreflector and thence an 84-foot-diameter paraboloid with linear or either sense of circular polarization. This system conversion increased the capabilities of the...

Ground penetrating radar (GPR) with a suspended 1 GHz horn antenna was deployed for measurement of soil water contents and dwatj wheat canopy reflections over bare and electrically terminating sutjaces. Sutjace reflection (SR) magnitudes and propagation times (PI) were used to independently calculate bulk soil dielectric constant and soil water contents. Measurements over wheat canopy shows tha...

High power ultra wideband (UWB) systems can be used for various applications like buried target detection, electrical characterization of materials, space debris detection and as a source for vulnerability studies on electronic circuits. Two high power UWB radiator systems have been developed at APPD, BARC Mumbai. The first one is a 120 kV, 66 Ohm system which uses balanced Transverse Electroma...

The Substrate Integrated Waveguide (SIW) technology is a very promising candidate to provide widespread commercial solutions for modern communications systems. Its main advantage is the possibility to integrate passive/active components and antennas in the same substrate by using standard manufacturing processes, such as the Printed Circuits Board (PCB) processing technique. Nevertheless, the p...

The usage of ultra-wideband (UWB) technology is growing in many communication systems such as radar systems, communication and measurement systems and imaging systems mainly because unlike the other wireless technologies UWB is not restricted to using a narrow waveband and it has high speed data rate. The large transmission bandwidth makes UWB-based electronic device resistive to interferences ...

─ A near-field focused folded transmitarray antenna is proposed at 2.45 GHz for medical applications. The proposed folded transmitarray construction introduces compact design, low profile, and reduced fabrication cost with focused power in both the near-field and far-field regions of the antenna. The transmitarray consists of a feeding horn antenna embedded centrally in the transmitarray struct...