Multiband systems (electronic systems that use more than one portions of the electromagnetic spectrum at the same time, for their operation) are in use today in a large number of commercial, scientific and military applications. Such applications include satellite communications, radiometers, scatterometers, and radar for commercial, scientific and military end- users. In these applications, the use of multiple frequencies enables the simultaneous access to bandwidths or gathering of additional data sets for the analysis of natural or man-made targets. Other applications are in mobile telephony, wi-fi and GPS for commercial applications where the combined functionality is needed in the next generation of handheld devices. Currently, the multiband capability is achieved by using subsystem blocks, each designed to operate at a single frequency band. Thus in a multiband system, there is redundant hardware that increases the cost, weight and complexity of such systems. The main objective of this project is the design, development and fabrication of passive quad-band components using metamaterial technology which can ultimately be used in a multiband system. Another goal is to establish a design methodology for the realization of quad-band devices which is essential to the spread of this technology as well as a way to build fully printed metamaterial unit cells. We have proposed the design of a branch-line coupler which forms an integral part of other subsystem blocks such as mixers, amplifiers and phase shifters. A quad-band antenna is also proposed that will serve as the interface between the received electromagnetic wave and the quad-band system. These parts will then be integrated to form an RF system chain and an analysis of the performance of the fabricated RF chain will follow. During the course of this project, some of the goals have already been achieved, while work will begin to accomplish the rests shortly. In short, the design methodology for the realization of the unit cells has been developed and unit cells using this theory have been designed, which will form the building blocks for the devices that will be constructed subsequently. The work on the mixer, the antenna and the integration will be completed during the next half of the project. We anticipate that the resulting work will prove that true multiband systems are achievable using metamaterial technology and our estimation is that hardware savings will result which can be translated into cost savings through size and complexity reduction. It is expected that dissemination of the findings will primarily be done through publications in well respected journals and through participation in major conferences in the field. The project is on course to meet future deliverables, and no problems with progress have been encountered so far.
This project has assembled a strong consortium of partners from Cyprus, Spain and Canada with wide and varied expertise in the field of metamaterials.
Autònoma de Barcelona
|University of Toronto||Canada|
The proposed research project has included a number of novel aspects.
The activities within the project were broken down into eight work packages as follows:
|WP1||Project Management||1) Define work distribution between all participants. 2) Assign milestones and define schedules for the project implementation and completion. 3) Define reporting procedure. 4) Plan and control all aspects of the project to achieve its objectives on-time and within budget.|
|1) Promote dissemination of project results in the relevant international forums. 2) Encourage exploitation of results. 3) Maximize the visibility of the HO to the scientific community, industry and potential end users.|
|WP3||Theory Development||1) Develop the necessary theory for the customization of the passband location and width 2) Formulate appropriate dispersion relations for the unit cells and create MATLAB code capable of computing unit cell lumped elements based on the dispersion relation. 3) Verify operation of the unit cells at the design frequencies based on the generated MATLAB results. 4) Create unit cell microwave circuit models for each type of unit cell.|
|WP4||Development of fully printed and lumped element quad band unit cells||1) Develop full wave EM simulations for the quad band unit cells required. 2) Unit Cells’ layout and assembly. 3) Fabricate the metamaterial unit cells. 4) Test and tune the fabricated devices.|
|WP5||Quad-Band Branch-Line coupler development||1) Develop a simulation for the quad band branch-line coupler 2) Design the branch-line coupler layout and assembly. 3) Fabricate the metamaterial coupler. 4) Test and tune the fabricated device.|
|WP6||Quad-band mixer development||1) Develop a microwave simulation for the quad band mixer. 2) Design the mixer layout and assembly. 3) Fabricate the metamaterial mixer. 4) Test and tune the fabricated mixer.|
|WP7||Quad-band antenna development||1) Use full-wave simulator to model the quad band antenna. 2) Design the antenna layout and antenna construction. 3) Test and tune the fabricated antenna.|
|WP8||Integration and Analysis||1) Integrate the individual RF blocks into an RF chain. 2) Test the chain and compare to initial specifications. 3) Analyze results and show hardware savings.|