Optimized design of substrate integrated waveguide cavity based oscillators (original) (raw)
High Performance VCO Design Using High Q SIW Resonator
2021 6th International Conference on Communication and Electronics Systems (ICCES), 2021
This paper presents a novel methodology to implement LC tank in the design of a Voltage Controlled Oscillator (VCO) for improved phase noise and tuning range. For frequency selection, Substrate Integrated Waveguide (SIW) based LC resonator is proposed and employed in cross-coupled differential pair. The SIW is designed to operate in the range from 55 GHz to 70 GHz while the VCO is designed to work at 60 GHz using 65 nm CMOS technology. The SIW resonator based VCO achieves high Quality factor (Q), improved tuning range and phase noise compared to conventional LC tank VCO. Simulation and analysis of results are performed in Keysight Advanced Design Systems while SIW structure is designed in Ansys HFSS which forms the feedback path. A detailed comparison is made between the two methods. The conventional LC VCO has a measured tuning range of 7.5 GHz while consuming 2.38 mW power from a 1-V power supply where as SIW tank VCO has an improved 15 GHz tuning range, absorbing 0.385 mW power from a 1-V power supply. The LC VCO and SIW tank VCO has a phase noise of -143.585 dBc/Hz and -113.8 dBc/Hz at 1 MHz offset and corresponding figure of merits are - 164 dBc/Hz and -195 dBc/Hz respectively
Miniaturization Trends in Substrate Integrated Waveguide for Microwave Communication Systems
2022 2nd International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET), 2022
Substrate integrated waveguide structure is an emerging candidate for the components operating within the microwave and millimeter-wave communication system due to its multiple advantages: compact size, low losses, and low fabrication cost. Recently miniaturization of SIW is taking place day by day. In this article, the link of full-mode SIW (FMSIW), eighth-mode SIW (EMSIW), and sixteenth mode SIW (SMSIW) has been presented with their additional advantages. This paper may be a guideline of the analysis of recent miniaturization of substrate integrated waveguides and it can provide a design guideline of microwave components especially in small-size systems.
Microwave Integrated CMOS Oscillators on Silicon-on-Insulator Substrate
30th European Microwave Conference, 2000, 2000
This paper shows the feasibility of implementing CMOS microwave oscillators on Silicon-on-Insulator (SOI) substrate at 5.8 and 12 GHz. The oscillators have been designed by introducing in a circuit simulator (SPICE) the SOI MOSFET's models developed at our laboratory. The models and the fabrication process of 0.25 µm channel length Fully Depleted (FD) SOI MOSFET's were not yet optimized for the first oscillator designs presented in this paper. However, the results show the potentiality of SOI CMOS technology for building low-power, low-voltage RF circuits.
A Review on SIW and Its Applications to Microwave Components
Electronics MDPI, 2022
Substrate-integrated waveguide (SIW) is a modern day (21st century) transmission line that has recently been developed. This technology has introduced new possibilities to the design of efficient circuits and components operating in the radio frequency (RF) and microwave frequency spectrum. Microstrip components are very good for low frequency applications but are ineffective at extreme frequencies, and involve rigorous fabrication concessions in the implementation of RF, microwave, and millimeter-wave components. This is due to wavelengths being short at higher frequencies. Waveguide devices, on the other hand, are ideal for higher frequency systems, but are very costly, hard to fabricate, and challenging to integrate with planar components in the neighborhood. SIW connects the gap that existed between conventional air-filled rectangular waveguide and planar transmission line technologies including the microstrip. This study explores the current advance-ments and new opportunities in SIW implementation of RF and microwave devices including filters, multiplexers (diplexers and triplexers), power dividers/combiners, antennas, and sensors for modern communication systems.
Review of substrate-integrated waveguide circuits and antennas
IET Microwaves, Antennas & Propagation, 2011
Substrate-integrated waveguide (SIW) technology represents an emerging and very promising candidate for the development of circuits and components operating in the microwave and millimetre-wave region. SIW structures are generally fabricated by using two rows of conducting cylinders or slots embedded in a dielectric substrate that connects two parallel metal plates, and permit the implementation of classical rectangular waveguide components in planar form, along with printed circuitry, active devices and antennas. This study aims to provide an overview of the recent advances in the modelling, design and technological implementation of SIW structures and components.
A Temperature-Compensation Technique for Substrate Integrated Waveguide Cavities and Filters
IEEE Transactions on Microwave Theory and Techniques, 2000
A new temperature compensation method is proposed and demonstrated in this paper for cavities and filters realized in substrate integrated waveguide (SIW). The SIW structures largely preserve the well-known advantages of conventional rectangular waveguide, namely, high and high power capacity, and have the advantages of microstrip lines, such as low profile, small volume, and light weight. In this paper, we demonstrate that by an adequate selection of substrate properties, SIW cavities can provide self-temperature drift compensation. The compensation is achieved by using an appropriate ratio between the coefficient of thermal expansion and the thermal coefficient of the permittivity. The theoretical prediction is confirmed by an experimental investigation using inductive post filters. Three commercially available substrates are used to design cavities at 10 GHz with the Roger TMM10 substrate providing a close fit to the required characteristics for temperature compensation. The results for the cavity show a stability of 2 ppm/ C in calculation and 8 ppm/ C in measurement. A SIW fourth-order Chebyshev filter, centered at 10 GHz with 1-GHz bandwidth, has also been designed. The measured frequency drift is 9.1 ppm/ C and the bandwidth variation is 0.13% over the temperature range of 40 C to 80 C. Index Terms-Cavity, coefficient of thermal expansion (CTE), equivalent linear frequency drift, filter, substrate integrated waveguide (SIW), temperature compensation.
Design and implementation of a substrate integrated waveguide phase shifter
2008
The design and implementation of a phase shifter based on the substrate integrated waveguide (SIW) technique operating at 10 GHz are presented. The proposed phase shifter consists of a SIW section with two inserted metallic posts. The phase shifting in this configuration is achieved by changing the diameter and the position of these posts. Numerical simulations have been carried out for different diameters and positions, which have shown good agreement with the theory. A parametric study was also conducted to assess the impact of errors made on the diameter and position of the two metallic posts. To prove the concept, prototypes were fabricated and measured. Experimental results agree well with simulations and S11 was better than-14 dB, S21 better than-1.08 dB and the phase error was less than 1.58.
Design and Analysis of Substrate Integrated Waveguide
Proceedings of the 1st International Conference on Sustainable Materials, Manufacturing and Energy Technologies, 2022
At microwave and higher frequencies, the need for highly efficient, low cost, high gain, easy to construct, and compact antennas for communication applications has increased. Although, Substrate Integrated Waveguides (SIW) technology is the emerging technology for radar and satellite applications. SIWs are widely employed as interconnection in antennas particularly leaky wave antennas, high speed circuits, directional couplers, and filters because they are having low loss properties of their typical metallic waveguides. A SIW with cylindrical slots is suggested in this work, as well as its integration with a tapered microstrip transmission line.
2015
This paper presents the design and practical implementation of a waveguide-based microwave filter in Substrate Integrated Waveguide (SIW) technology. The use of SIW technology for implementing waveguide filters makes the presented design specially aimed for being used in undergraduate courses related to microwave engineering and filter designing. Their low cost and easiness from the filter fabrication point of view allows their use in microwave laboratory courses where students can implement their own theoretical filter designs and measure their frequency response. The requiring mechanics in the manufacturing of microwave filters in waveguide technology (both rectangular and circular) makes its use practically unfeasible in academic laboratories because of its cost. For this reason, a practical design example of a waveguide iris filter using the impedance inverter model is proposed in this paper for academic laboratories, using SIW technology. This is a low cost and easy to manufact...