I. Venneri

Reduction of Patch Antenna Coupling by Using a Compact EBG Formed by Shorted Strips With Interlocked Branch-Stubs

This letter presents a new type of planar electromagnetic band-gap (EBG) surface composed of short-circuited microstrips densely coupled with each other through interlocked branch stubs. With respect to a conventional mushroom surface, this structure exhibits a better space-wave decoupling performance due to the soft nature of the surface. With respect to other soft surfaces, like shorted strip already introduced in the literature, the present solution possesses better miniaturization properties, thus allowing the use of lower permittivity and consequent improvements when integrated in planar dense arrays. The experimental results demonstrate a decoupling until 38 dB in both planes for patches separated by only one half free-space wavelength.

Hybrid Array Antenna for Broadband Millimeter-Wave Applications

A hybrid array configuration suitable for wideband millimeter-wave applications is presented in this work. The proposed structure is based on the use of circular waveguide elements electromagnetically coupled trough circular apertures to a stripline distribution network. The adopted excitation mechanism avoids the use of transition components generally reducing the overall antenna efficiency. Simulated and measured results on a Ka-band prototype are discussed to prove the wideband radiation behavior.

Millimeter waves patch antenna design and realization on BCB polymer substrates

In this paper, the design and fabrication procedure for millimeter wave printed antennas have been proposed. The procedure is based on the custom manufacture of PCB boards realized using BCB substrates and physical vapor deposition for the copper layers. The fabrication process has been validated for both single and multiple layer printed antennas showing in both cases an accuracy level suitable for the production of millimeter wave printed antennas. In the following are reported the main equipments used to realize the proposed prototypes: 1) 10000 rpm spin coater, 2) 260degC controlled atmosphere convection oven, 3) 2500degC at 10-6 mbar evaporator system, 4) 2 mum resolution ultraviolet laser writer.

Patch arrays integrated with an EBG-surface

This paper presents results for an array of patch embedded in an EBG. The EBG surface is composed by short-circuited microstrips densely coupled each other through interlocked branch stubs. With respect to a conventional mushroom surface, this structure exhibits a better space-wave decoupling performance. The experimental results demonstrate decoupling till 38 dB in both planes for patches separated by only one half free-space wavelength.

Hybrid array for wideband millimeter-wave applications

A hybrid array configuration based on circular waveguide radiators electromagnetically coupled to a stripline distribution network is proposed in this work. Manufacturing advantages of microstrip feed networks are combined with efficiency performances of waveguides to obtain a wideband structure suitable for millimeter-wave applications. Furthermore, loss mechanisms are strictly reduced with respect to similar configurations existing in literature, due to the absence of transition components. An X-band prototype is fully designed, realized and experimentally tested to show a wide radiation bandwidth. Simulated performances of a 60 GHz array are also discussed.