Comparative design of millimeter wave RF-MEMS phase shifters

Download
index.pdf
2016
Kobal, Enis
Show full item record
316
views
138
downloads
Phase shifters are widely used for electronic beam steering for various antenna applications. This thesis presents design and comparison of 3 di erent 3-bit transmission type phase shifters, which are switch-line, Distributed MEMS Transmission Line (DMTL) and triple stub phase shifters, realized with capacitive contact Radio Frequency (RF) Micro-Electro-Mechanical Systems (MEMS) switches for Ka-Band applications. For the design of switch-line phase shifter reducing the sensitivity of the electrical performance to the fabrication tolerances and by this way increasing the yield is targeted by minimizing the air-bridges used in the design. In order to achieve this, new Coplanar waveguide (CPW) T-junction and CPW bend structures are designed. For DMTL phase shifter design, a new method based on using circuit models is used instead of the conventional DMTL phase shifter for reducing the computational work and for preventing to obtain an inapplicable design, because of the dimensions, with the conventional method. In this thesis also a triple stub phase shifter is designed with the motivation of reducing the number of control bits. Comparisons of these phase shifters are done in terms of their insertion/return losses, maximum phase errors, bandwidths at 35 GHz, pull-in voltages of the switches used in the designs, layout dimensions of the phase shifters and number of control bits of the phase shifters. DMTL phase shifter is the most favourable phase shifter in terms of its low loss, small size and low pull-in voltage. Whereas switch-line phase shifter shine outs only with its large bandwidth. Compared with DMTL and switch-line phase shifters, triple stub phase shifter is only favourable in terms of its layout dimensions.
Radio frequency microelectromechanical systems., Microelectromechanical systems., Antennas (Electronics).
http://etd.lib.metu.edu.tr/upload/12620113/index.pdf
https://hdl.handle.net/11511/25755
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Design of smart antenna array for interference suppression in GPS
Dabak, Ömer Can; Alatan, Lale; Koç, Seyit Sencer; Department of Electrical and Electronics Engineering (2016)
GPS jammers add excessive noise to received low power GPS signals and have capability to weaken or completely destroy the positioning performance of GPS receivers. The most popular technique to overcome GPS jamming problem is suppression of jammers by using array signal processing techniques. In this thesis, a GPS anti-jamming system is constructed by designing an active antenna array and implementing adaptive beamforming techniques. This thesis mainly include the design of four element active circularly po...
Cantilever type radio frequency microelectromechanical systems shunt capacitive switch design and fabrication
Demirel, Kaan; Yazgan, Erdem; Demir, Şimşek; Akın, Tayfun (SPIE-Intl Soc Optical Eng, 2015-9-21)
A new cantilever type radio frequency microelectromechanical systems (RF MEMS) shunt capacitive switch design and fabrication is presented. The mechanical, electromechanical, and electromagnetic designs are carried out to get <40 V actuation voltage, high isolation, and low insertion loss for 24 and 35 GHz and the fabrication is carried out for 24 GHz RF MEMS switch. The fabricated switch shows lower than 0.35 dB insertion loss up to 40 GHz and greater than 20 dB isolation at 22 to 29 GHz frequency band. An...
Design of an X-band 3-bit RF MEMS constant phase shifter
Kuzubaşlı, Ahmet; Akın, Tayfun; Demir, Şimşek; Department of Electrical and Electronics Engineering (2016)
This thesis presents a 3-bit 180° constant phase shifter design implementing Co-Planar Waveguide (CPW) and RF MEMS variable capacitors with ±1.8% accuracy at 10 GHz and ±5.8% maximum peak error between 9-11 GHz. The phase shifter with minimum phase errors is determined by considering exemplary circuit simulations of different phase shifter types designed with a novel in-house RF MEMS fabrication process [1] parameters. Due to its wide-band characteristics and CPW compatibility, the selected topology is the ...
Design and implementation of VHF-UHF antenna with non-foster matching circuit
Aşcı, Cihan; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2018)
Matching networks are widely used in the antenna transmitter and receiver applications and thus they are an essential part of the RF system. Conventional passive matching networks are very broadly used for matching an antenna for a narrow band of frequencies; however, achieving a broad bandwidth characteristics for electrically–small antennas (ESAs) is not possible with the use of passive matching circuits. ESAs possess a large input reactance and the electrical size of the antenna element is very small com...
A Readout circuit for resonant MEMS temperature sensors
Asadi, Hamed; Akın, Tayfun; Azgın, Kıvanç; Department of Electrical and Electronics Engineering (2016)
High precision is the dominant advantage that resonant sensors have over other types of analog sensors (sensors with a subsequent analog-to-digital converter). The resolution of these precise sensors is determined by both frequency resolution and sensitivity of the sensor. The sensitivity is highly related to the sensitivity of the MEMS resonator. However, the frequency resolution is dominantly defined by the closed-loop circuitry if noise contribution of the resonator is assumed to be smaller than that of ...
Citation Formats
E. Kobal, “Comparative design of millimeter wave RF-MEMS phase shifters,” M.S. - Master of Science, Middle East Technical University, 2016.
METU IIS - Integrated Information Service open@metu.edu.tr