Co-design of Reconfigurable Microwave Components
Il y a 2 mois
**Co-design of reconfigurable microwave components integrated on porous silicon substrates**:
- Réf
- **ABG-112640**
- Sujet de Thèse- 29/03/2023- Contrat doctoral- Lab-STICC- Lieu de travail- Brest - Bretagne - France- Intitulé du sujet- Co-design of reconfigurable microwave components integrated on porous silicon substrates- Champs scientifiques- Télécommunications
- Electronique
- Mots clés- Antenna, Filter, Reconfigurable, RF switches, porous silicon, semiconductor physics, tunable**Description du sujet**:
Abstract:
Whether in the context of 5G or the following standards, future communication systems
will have to answer to an ever-increasing demand in terms of number and quality of services.
For this, the design of radio-frequency terminals will require a major change in order to offer
high-performance microwave components and antennas able to address different norms or
standards, while minimizing their impact in terms of energy consumption, dimensions, weight
and costs. The use of reconfigurable components and antennas is a solution to these challenges
since they make it possible to limit the number of components integrated in the same terminal.
Reconfigurable devices can be tunable in terms of resonant frequency, bandwidth or radiation
pattern for the antennas (pointing direction, beam width, polarization, etc.). Different solutions
for reconfiguring a device or a microwave antenna already exist such as semiconductor
components (PIN diodes, varactor, etc.), MEMS or so-called agile materials (ferroelectric,
liquid crystals, etc.). However, the interconnection of the active and passive elements causes
parasitic effects and a limitation of the rise in frequency related to the size of the soldered active
element (i.e. Surface Mounted Devices (SMD)). Finally, this design method is not flexible
(linked to the dimensions and location of the active component, need for metallized vias). On
the other hand, the transmission lines are designed by optimizing their quality factors i.e. their
losses while the deferred active elements are optimized in size. The result of their association
is a device that has a low quality factor linked to the losses of the tuning element and a large
size linked to the footprint of the passive part.
The feasibility of co-designing tunable microwave devices such as filters or antennas
has already been demonstrated in [1]-[8] where the idea is to design the microwave components
on a semiconductor substrate such as silicon and to size and position doped zones in a judicious
way in order to modify the behavior of the component and thus make it the tunable passive
component. This solution, recently developed at Lab-STICC in Brest, offers great flexibility
and a simplified design of reconfigurable circuits, performance optimization and ease of
integration. However, the high permittivity of the silicon substrate is not optimal for antenna
performance. Thus, we propose in this project to explore a new technology such as porous
silicon which allows both to decrease the permittivity and the losses of the substrate [9]-[11].
Thesis Description:
Thesis: Co-design of tunable microwave devices integrated on porous silicon
The doctoral student will rely on the knowledge developed at Lab-STICC
commercial software allowing to describe both the transport of charges in semiconductor
junctions (Silvaco) and the effects of propagation of electromagnetic waves (HFSS). This thesis
will focus on tunable antennas on porous silicon going towards the system aspect and
integration of several functions of the RF front-end. A state-of-the art on tunable components,
tuning solutions and semiconductor components will be carried out. Then, once the properties
of porous silicon have been mastered, different junctions will be studied in order to propose
innovative topologies of integrated tunable antennas and then of several elements of the RF
front-end within the same chip.
The demonstrators will be made at the laboratory GREMAN at the university of
TOURS. From the proposed co-design method, tunable devices (such as switches, multi-state
tunable resonators, bandwidth or frequency tunable filters, as well as frequency tunable
antennas) have already been realized. They made it possible to show the flexibility of design
based on a controlled process and high precision, offering the possibility of moving towards
high-frequency demonstrators. Thus, the proposed thesis is the logical continuation of this work
which will make it possible to increase the performance of antennas thanks to porous silicon
and to go further towards the co-design no longer of components but of functions or even
subsystems.
Références:
[1] R. Allanic et al., “Temperature Dependence of Tunable Resonators on FR4 and
Silicon,” in Proc. Asia-Pacific Microwave Conf., 2017, pp. 8-11.
[2] R. Allanic, Y. Quéré, D. Le Berre, and C. Quendo, “Intrinsically microwave tunable
resonator designed on silicon,” Electron. Lett., vol. 52, no. 20
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