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Compact Reflective Microstrip Phase Shifter for Traveling Wave Antenna Applications
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Signal Processing.
2006 (English)In: IEEE Microwave and Wireless Components Letters, ISSN 1531-1309, E-ISSN 1558-1764, Vol. 16, no 7, 431-433 p.Article in journal (Refereed) Published
Abstract [en]

A varactor diode based microstrip phase shifter for 5.8 GHz is presented. It is designed for use in microstrip traveling Wave antennas where there is a strict limitation on the available space for the phase shifters. To meet all requirements, a reflective type phase shifter is chosen. Such a phase shifter includes a hybrid coupler. A compact branch line coupler is designed to make the phase shifter fit between the radiating elements in the antenna, while maintaining sufficient electrical performance. Phase shifters are designed with different types of stubs connecting the diodes to ground. A phase tuning range of 621 is measured for a phase shifter with parallel open stubs, and 92 degrees with shorted stubs. Insertion loss is in both cases less than 0.6 dB. A complete five-element array antenna is built and characterized. Measurements show beam scanning angles within 32 degrees from broadside.

Place, publisher, year, edition, pages
2006. Vol. 16, no 7, 431-433 p.
Keyword [en]
branch line coupler; hybrid; reflective type phase shifter (RTPS); traveling wave antenna; varactor
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-94863DOI: 10.1109/LMWC.2006.877126ISI: 000238865400015OAI: oai:DiVA.org:uu-94863DiVA: diva2:168864
Available from: 2006-09-22 Created: 2006-09-22 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Integrated Antennas: Monolithic and Hybrid Approaches
Open this publication in new window or tab >>Integrated Antennas: Monolithic and Hybrid Approaches
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis considers integration of antennas and active electronics manufactured on the same substrate. The main topic is on-chip antennas for commercial silicon processes, but hybrid integration using printed circuit board technology is also addressed.

The possible use of micromachining techniques as a means of reducing substrate losses of antennas manufactured on low resistivity silicon wafers is investigated. Compact dipole, loop, and inverted-F antennas for the 20-40 GHz frequency range are designed, implemented, and characterized. The results show significantly improved antenna efficiency when micromachining is used as a post-processing step for on-chip antennas manufactured in silicon technology.

High resistivity wafers are used in a commercial silicon germanium technology to improve the efficiency of dipole antennas realized using the available circuit metal layers in the process. Monolithically integrated 24 GHz receivers with on-chip antennas are designed and evaluated with regard to antenna and system performance. No noticeable degradation of the receiver performance caused by cross talk between the antenna and the integrated circuit is observed.

For low frequency antenna arrays, such as base station antennas, hybrid integration of active devices within the antenna aperture is treated. A compact varactor based phase shifter for traveling wave antenna applications is proposed and evaluated. Electrically steerable traveling wave patch antenna arrays, with the phase shifters implemented in the same conductor layer as the radiating elements, are designed and manufactured in microstrip technology. It is experimentally verified that the radiation from the feed network and phase shifters in the proposed antenna configuration is small.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 69 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 221
Keyword
Electronics, antenna travelling wave arrays, antenna phased arrays, phase shifters, micromachining, silicon, monolithic microwave integrated circuits, dipole antennas, loop antennas, slot antennas, Elektronik
Identifiers
urn:nbn:se:uu:diva-7142 (URN)91-554-6651-6 (ISBN)
Public defence
2006-10-13, Siegbahnsalen, Ångströmlaboratoriet, Lägerhyddsv. 1, Uppsala, 10:15
Opponent
Supervisors
Available from: 2006-09-22 Created: 2006-09-22 Last updated: 2013-05-17Bibliographically approved
2. Integrated Antenna Solutions for Wireless Sensor and Millimeter-Wave Systems
Open this publication in new window or tab >>Integrated Antenna Solutions for Wireless Sensor and Millimeter-Wave Systems
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents various integrated antenna solutions for different types of systems and applications, e.g. wireless sensors, broadband handsets, advanced base stations, MEMS-based reconfigurable front-ends, automotive anti-collision radars, and large area electronics.

For wireless sensor applications, a T-matched dipole is proposed and integrated in an electrically small body-worn sensor node. Measurement techniques are developed to characterize the port impedance and radiation properties. Possibilities and limitations of the planar inverted cone antenna (PICA) for small handsets are studied experimentally. Printed slot-type and folded PICAs are demonstrated for UWB handheld terminals.

Both monolithic and hybrid integration are applied for electrically steerable array antennas. Compact phase shifters within a traveling wave array antenna architecture, on single layer substrate, is investigated for the first time. Radio frequency MEMS switches are utilized to improve the performance of reconfigurable antennas at higher frequencies. Using monolithic integration, a 20 GHz switched beam antenna based on MEMS switches is implemented and evaluated. Compared to similar work published previously, complete experimental results are here for the first time reported. Moreover, a hybrid approach is used for a 24 GHz switched beam traveling wave array antenna. A MEMS router is fabricated on silicon substrate for switching two array antennas on a LTCC chip.

A concept of nano-wire based substrate integrated waveguides (SIW) is proposed for millimeter-wave applications. Antenna prototypes based on this concept are successfully demonstrated for automotive radar applications.

W-band body-worn nonlinear harmonic radar reflectors are proposed as a means to improve automotive radar functionality. Passive, semi-passive and active nonlinear reflectors consisting of array antennas and nonlinear circuitry on flex foils are investigated.

A new stretchable RF electronics concept for large area electronics is demonstrated. It incorporates liquid metal into microstructured elastic channels. The prototypes exhibit high stretchability, foldability, and twistability, with maintained electrical properties.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 114 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 698
Keyword
harmonic radar (HR), liquid alloy, millimeter-wave, micromachining, phase shifters, planar inverted cone antennas (PICA), printed circuit boards (PCB), quasi-Yagi antennas, radio frequency microelectromechanical system (RF MEMS), stretchable antennas, substrate integrate waveguides (SIW), T-matched dipole antennas, tapered slot antennas, traveling wave array antennas, ultrawideband (UWB), wireless sensor networks.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:uu:diva-111197 (URN)978-91-554-7681-6 (ISBN)
Public defence
2010-01-29, Siegbhansalen, Lägerhyddsvägen 1, The Ångström Laboratory, Uppsala, 13:30 (English)
Opponent
Supervisors
Projects
wisenet
Available from: 2010-01-07 Created: 2009-12-06 Last updated: 2011-01-17Bibliographically approved

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