R. C. Hadarig

Novel SHF-Band Uniplanar Artificial Magnetic Conductor

The design of a novel SHF-band uniplanar artificial magnetic conductor (AMC) is presented. A prototype is manufactured and characterized based on reflection coefficient phase. The designed prototype shows broad AMC operation bandwidth and polarization angle independency. Its angular margin when operating under oblique incidence is also tested. The results are supported by finite element method (FEM) simulations and measurements in an anechoic chamber.

Microstrip Patch Antenna Bandwidth Enhancement Using AMC/EBG Structures

A microstrip patch antenna with bandwidth enhancement by means of artificial magnetic conductor (AMC)/electromagnetic band-gap structure (EGB) is presented. The electrical characteristics of the embedded structure are evaluated using MoM simulations. The manufactured prototypes are characterized in terms of return loss, gain, and radiation pattern measurements in an anechoic chamber.

Novel Bow-tie–AMC Combination for 5.8-GHz RFID Tags Usable With Metallic Objects

A novel combination of coplanar waveguide (CPW)-fed double bow-tie slot antenna and artificial magnetic conductor (AMC), which meets the requirements of a 5.8-GHz SHF RFID tag antenna usable on metallic objects, is presented. The manufactured prototype is characterized in terms of return loss, gain, and radiation pattern measurements in an anechoic chamber, both alone and on a metallic plate.

Flexible Uniplanar Artificial Magnetic Conductor

A flexible uniplanar Artificial Magnetic Conductor (AMC) design is presented. FEM simulations used to design and analyze the performance of the AMC structure are shown. Its performance under flat and bent conditions is characterized by means of reflection coefficient phase measurements of a manufactured prototype in an anechoic chamber. Broad AMC operation bandwidth and polarization angle independency is found for the prototype in both flat and bent situations. In addition, its angular margin under oblique incidence operation is also measured.

Novel Miniaturized Artificial Magnetic Conductor

The design of a novel miniaturized artificial magnetic conductor (AMC) using interdigital capacitors is presented. The operation of the AMC is evaluated using finite element method (FEM) simulations. A prototype is manufactured and characterized based on reflection coefficient phase in an anechoic chamber. The performance of the AMC unit cell for both normal and oblique incidence is also studied.

A Compact Band-Pass Filter with High Selectivity and Second Harmonic Suppression

The design of a novel band-pass filter with narrow-band features based on an electromagnetic resonator at 6.4 GHz is presented. A prototype is manufactured and characterized in terms of transmission and reflection coefficient. The selective passband and suppression of the second harmonic make the filter suitable to be used in a C band frequency range for radar systems and satellite/terrestrial applications. To avoid substantial interference for this kind of applications, passive components with narrow band features and small dimensions are required. Between 3.6 GHz and 4.2 GHz the band-pass filter with harmonic suppression should have an attenuation of at least 35 dB, whereas for a passband, less than 10% is sufficient.

High-Performance Computational Electromagnetic Methods Applied to the Design of Patch Antenna with EBG Structure

In this contribution High-Performance Computing electromagnetic methods are applied to the design of a patch antenna combined with EBG structure in order to obtain bandwidth enhancement. The electrical characteristics of the embedded structure (patch antenna surrounded by EBG unit cells) are evaluated by means of method of moment technique (MoM) whereas for designing the unit cell, the finite element method (FEM) together with the Bloch-Floquet theory is used. The manufactured prototypes are characterized in terms of return loss and radiation pattern in an anechoic chamber.