Characterization of asymmetric coplanar waveguide discontinuities

Dib, Nihad; Gupta, Mohan; Ponchak, George E.; Katehi, L.P.B.

doi:10.1109/22.245676

Cited by 49 publications

(18 citation statements)

References 16 publications

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“…Alternatively, the undesired slotline mode may be suppressed by balancing the electric potential of the two ground planes with additional conducting straps or bond wires, e.g. [18,20].…”

Section: Methodsmentioning

confidence: 99%

An integrated microelectromechanical microwave switch based on piezoelectric actuation

et al. 2008

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In the field of microwave applications, microelectromechanical systems (MEMS) are attractive devices in order to force miniaturization by on chip integration. Here, we describe the design, fabrication and testing of a silicon based micromachined switch using piezo-electrically actuated elements. The microwave circuit consists of a coplanar waveguide (CPW) design with two piezoelectric activated beams integrated between the middle line and the ground planes. During operation the beams short the CPW by two overhanging bridge contacts and therefore the transmission characteristics of the microwave circuit change. The CPW is realized by 3 µm thick electroplated copper to yield good transmission characteristics, whereas the clamped-clamped beams benefit from a 250 nm thin PZT film between 100 nm thin Pt electrodes on top of a SiO 2 layer. By the use of double side clamped beams awkward stress compensation of the piezoelectric stack is omitted. Instead the system relies on some initial mechanical stress. Measurements prove deflections of more than 13 µm for a 1400 µm long beam with operation voltages below 10 V. This is in good agreement with finite element simulations. The novel RF-MEMS is predicted to reach an isolation (in "on" state) of more than 20 dB up to 15 GHz.

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“…Alternatively, the undesired slotline mode may be suppressed by balancing the electric potential of the two ground planes with additional conducting straps or bond wires, e.g. [18,20].…”

Section: Methodsmentioning

confidence: 99%

An integrated microelectromechanical microwave switch based on piezoelectric actuation

et al. 2008

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“…This mode is called an odd mode or coupled slot-line mode of propagation. Whereas a few works have taken advantage of the odd mode (e.g., see [6]), this mode of propagation is generally considered as an unwanted mode [7][8][9][10]. Figure 1 shows the magnetic and electric fields of a CPW in even and odd modes.…”

Section: Finite-ground Cpw and Odd Mode Of Propagationmentioning

confidence: 99%

Design and layout techniques for a mm-wave body-biased variable-gain amplifier

Rashtian

Mirabbasi

2013

Int J RF and Microwave Comp Aid Eng

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A two‐stage mm‐wave variable‐gain amplifier is designed and implemented in a 65‐nm CMOS technology. A fully symmetric layout has been utilized to suppress the odd‐mode of propagation and increase the quality factor in co‐planar waveguide transmission lines. Moreover, a new design technique is proposed for implementing decoupling capacitors for mm‐wave frequencies. Body‐biasing technique is utilized to change the amplifier gain without significant change in the overall power consumption of the circuit. The measurement results show that the amplifier achieves a peak gain of 10 dB with a gain variation range of 25 dB while consuming 12 mW from a 1.2‐V supply. © 2013 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:470–477, 2014.

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“…Fueled by the demand of compact monolithic microwave integrated circuits (MMICs) for telecommunication and space applications, significant amount ofresearch has been performed on coplanar waveguide (CPW) based topologies due to CPW's several advantages over other competing transmission lines [1,2]: The grounds and the signal are on the same side of the substrate eliminating the need for via-holes or wraparound process [3,4]. Also, the characteristic impedance is determined by the ratio ofthe width of center strip conductor to the distance between the two semi-infinite ground planes [5] enabling compact designs, something demonstrated by the numerous CPW-based microwave probes commonly used for the characterization of microwave integrated circuits.…”

Section: Introductionmentioning

confidence: 99%

A Fully Micromachined W-Band Coplanar Waveguide to Rectangular Waveguide Transition

Pan

Tentzeris

et al. 2007

2007 IEEE/MTT-S International Microwave Symposium

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A novel fully micromachined coplanar waveguide (CPW) to rectangular waveguide transition is presented in this paper. A metalized probe is adopted to couple the signal from the CPW to the rectangular waveguide through an aperture located at the center of the bottom broad wall of the rectangular waveguide. The transition was optimized using HFSS 10 over the whole W-band. In the proposed transition, the CPW and the rectangular waveguide are patterned and integrated on the same side of the substrate, while the coupling probe is patterned on the substrate instead of being fabricated separately. These changes make the transition more suitable for RF packaged circuits and easily extendable to THz applications. The measured average insertion loss of the back-to-back structure is 2.25dB and the return loss is better than 11 dB over the whole W-band.

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Characterization of asymmetric coplanar waveguide discontinuities

Cited by 49 publications

References 16 publications

An integrated microelectromechanical microwave switch based on piezoelectric actuation

An integrated microelectromechanical microwave switch based on piezoelectric actuation

Design and layout techniques for a mm-wave body-biased variable-gain amplifier

A Fully Micromachined W-Band Coplanar Waveguide to Rectangular Waveguide Transition

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