This work presents the design of a low-cost concept of reconfigurable antenna used as a test vehicle. It is based on parasitic elements to simplify the feed distribution network of reconfigurable antenna. The synthesis of this antenna consists of the stimulation of couplings to maximize the directivity in one or several given directions. A constraint on the antenna matching is also set to avoid the addition of a dedicated circuit on the driven element. A prototype with 49 elements working at 2.45GHz has been manufactured and measured. The results present a very good agreement. The originality of this work is based on the important number of parasitic elements and on the reactive loads connected to them. These loads are synthesized to satisfy both the radiation objective and the matching constraint.

This paper presents the design of a dual band filter for the integration of a RF receiver front-end in the L band. The synthesis from the imposed filtering specifications led us to choose the SIW technology that ensures a good trade-off between electrical performances and space requirements.

This paper presents a design of a micro-strip circularly polarized antenna intended for the Global Navigation Satellite Systems (GNSS). The presented device is composed of a micro-strip slotted patch antenna printed on a Rogers RO3006 substrate, a foam layer of 2 mm thick and a wideband commercial 3-dB SMT coupler. The combined fullwave antenna results with the measured S-Parameters of the coupler shows very good performances in terms of antenna matching and axial ratio on larger bandwidths.

The computation of accurate weightings for a reconfigurable antenna remains a challenging task when the number of elements is moderate. In fact, the infinite periodic formalisms lead to inaccurate results for the element close to the edges. Moreover, in case of failure or dispersion on the performances of a reconfigurable element (e.g. phase shifter), it may be difficult to isolate the origin of a dysfunction. In this contribution, we propose an analysis and synthesis process including electromagnetic simulation, analytical synthesis and measurements data to optimize the performances of reconfigurable antennas. A simple test prototype has been used to validate the performances and to show the interest of this approach that can be extended to a wide category of multi-elements antennas.

This paper presents the structuration and the first results of a research program dedicated to the co-design and the co-integration of a multiband antenna array for a GPS/Galileo receiver. The objective is to develop a novel design approach taking into account all parts of the RF system simultaneously. By this way, the aim is to improve the performances of the RF front-end compared to a traditional approach where RF circuits would be designed separately.

This article presents a simple reconfigurable antenna concept based on the mutual couplings between parasitic elements. The developed antenna operates in the Industrial Scientific and Medical band (ISM) at 2.45 GHz. The objective of this work consists in the development of a generic and low cost reconfigurable antenna, with a 1D or 2D layout. The parasitic elements are loaded with varactor phase shifters and the global synthesis is performed through different radiation pattern objectives. In this contribution, we have limited these objectives to two opposite directions. The design has been manufactured and measured. The comparison with simulations shows a very good agreement.

In this letter, we present a synthesis method to design parasitic element antennas in a short and illustrative way without the need of parametric studies. The major aim of this method is to synthesize the antenna radiation pattern in a given direction, i.e., to find the equivalent reactive loads that must satisfy each parasitic element. The chosen structure to validate this principle is a 2.45-GHz Yagi-Uda antenna with surface mounted devices (SMD) acting as the synthesized reactive loads. This antenna has been successfully designed and measured. The SMD components have been introduced to demonstrate that the method is helpful to produce generic design.

This article presents a design of a planar 2D parasitic elements monopole array. This design is an active reconfigurable antenna for scanning beams applications in the azimuth plane. A 16% frequency-tuning bandwidth is achieved from 4.6 to 5.4 GHz band. The beam's direction is controllable with on/off states that can be generated with switches laying between the elements and the ground plane.

This article presents a design of a new compact planar Yagi-Uda antenna with three parasitic element fed by coplanar waveguide (CPW). The antenna is realized on multi-layer substrate (FR4) with 1.58mm of thickness and a relative permittivity of 4.4. The antenna is intended to operate at the ISM band with an obtained realized gain of 6.7 dB and a 184 MHz of bandwidth. The design of the antenna is carried out using the commercial electromagnetic simulator CST Microwaves Studio. The measured results of the whole system satisfied the simulated performances.

A synthesis method to design multielement antennas with couplings is presented. The main objective is to perform a rigorous determination of the electromagnetic characteristics involved in the design, especially with arrays of moderate sizes. The aim is to conceive jointly and efficiently the antenna and the circuits to connect (feed distribution network, power amplifiers, reactive loads, etc.). The subsequent objective is to improve the understanding and capabilities of strongly coupled antennas. As a whole, the synthesis procedure is then applied to different antenna architectures in order to show its efficiency and versatility. A focus on some antenna concepts where the management of couplings is a key factor to improve the performances is presented. After describing the synthesis procedure, the first category of coupled multielement antenna studied concerns radiating arrays in linear or circular polarization. A design including couplings effects on an active array is also presented. Then, the method is applied to parasitic antenna arrays and a specific investigation on reflectarray antenna is performed as they can be considered as a particular case of parasitic arrays.