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Microwave and Wireless Components Letters, IEEE

Issue 1 • Date Jan. 2003

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Displaying Results 1 - 11 of 11
  • 5.8-GHz CMOS T/R switches with high and low substrate resistances in a 0.18-μm CMOS process

    Publication Year: 2003 , Page(s): 1 - 3
    Cited by:  Papers (41)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (349 KB) |  | HTML iconHTML  

    Two single-pole, double-throw transmit/receive switches were designed and fabricated with different substrate resistances using a 0.18-μm p/sup $/substrate CMOS process. The switch with low substrate resistances exhibits 0.8-dB insertion loss and 17-dBm P/sub 1dB/ at 5.825 GHz, whereas the switch with high substrate resistances has 1-dB insertion loss and 18-dBm P/sub 1dB/. These results suggest that the optimal insertion loss can be achieved with low substrate resistances and 5.8-GHz T/R switches with excellent insertion loss and reasonable power handling capability can be implemented in a 0.18-μm CMOS process. View full abstract»

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  • A low phase noise silicon 18-GHz push-push VCO

    Publication Year: 2003 , Page(s): 4 - 6
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (354 KB) |  | HTML iconHTML  

    The design and measurement of a push-push voltage controlled oscillator (VCO) at 18.66-18.3 GHz are presented in this paper. The circuit includes two packaged silicon transistors (Siemens BFP 540F) and a microstrip resonator tuned by two GaAs varactor diodes (M/A-COM ML46580). A 360-MHz tuning range is obtained with an output power of 0-3.1 dBm. The fundamental rejection is around 17 dB for a wide range of collector bias current. The phase noise is below -103 dBc/Hz at 100-kHz offset and below -122 dBc/Hz at 1 MHz for the entire tuning bandwidth. View full abstract»

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  • Voltage-controlled PIN diode attenuator with a temperature-compensation circuit

    Publication Year: 2003 , Page(s): 7 - 9
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (203 KB) |  | HTML iconHTML  

    This paper presents a voltage-controlled PIN diode attenuator and its temperature-compensation circuit composed of a thermistor and simple operational amplifier circuits. After carefully investigating the temperature characteristics of PIN diode attenuators, we designed voltage-controlled PIN diode attenuators showing the linear attenuation characteristics of 16 dB with input voltage within the operating temperature range. The fabricated attenuator has demonstrated the improvement of attenuation variation from 15 to 0.5 dB in the temperature range from -15 to 65/spl deg/C. View full abstract»

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  • Planar realization of low phase noise 15/30 GHz oscillator/doubler using surface mount transistors

    Publication Year: 2003 , Page(s): 10 - 12
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (418 KB) |  | HTML iconHTML  

    This paper presents the application of a novel high-Q planar waveguide resonator for microwave oscillator design. The waveguide cavity is made in printed-circuit-board process, first using a routed cut followed by a plated via-through-hole. Measurements show that the oscillator stabilized by the resonator delivers an output power of 14 dBm at 15 GHz and a phase noise of -98 dBc/Hz at 100 kHz offset from the carrier, under 5-V single bias. Experiments indicate the predominance of the waveguide resonator by a 13-dB phase noise improvement at 100 kHz offset against the microstrip oscillator. View full abstract»

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  • Shorting strap tunable single feed dual-band PIFA

    Publication Year: 2003 , Page(s): 13 - 15
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (306 KB) |  | HTML iconHTML  

    RF switches are integrated to the shorting straps of a single feed dual-band planar inverted-F antenna (PIFA) to make a tunable PIFA. The L-band switch yields 0.45-dB insertion loss (IL) and 10-dB isolation bandwidth (BW) of 40% at 1.5 GHz. The tunable PIFA yields 39% impedance BW at 900-MHz band and 7.8% BW at 2000-MHz band. The measured radiation patterns are nearly omni-directional and yield a gain of -7.8 dBi at 652 MHz and 4.3 dBi at 2104 MHz. View full abstract»

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  • Compact microstrip bandpass filter with two transmission zeros using a stub-tapped half-wavelength line resonator

    Publication Year: 2003 , Page(s): 16 - 18
    Cited by:  Papers (81)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (254 KB) |  | HTML iconHTML  

    A compact microstrip bandpass filter is developed using a half-wavelength (/spl lambda//2) transmission line resonator with a pair of tap-connected open-ended stubs. Such paired stubs with total length of about /spl lambda//2 constructs an equivalent line resonator. Together with two separated /spl lambda//4 line resonators, the three transmission poles can be achieved inside the passband. Meanwhile, two stub lengths are adjusted slightly longer and shorter than /spl lambda//4 to realize the two transmission zeros at both low and high rejection bands. Further, the long tapped-stub is kept wider than its short counterpart to improve the low rejection behavior. A filter sample is designed and fabricated to provide an experimental verification on the proposed filter. View full abstract»

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  • Time-delay phase shifter controlled by piezoelectric transducer on coplanar waveguide

    Publication Year: 2003 , Page(s): 19 - 20
    Cited by:  Papers (12)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (256 KB) |  | HTML iconHTML  

    A time-delay phase shifter controlled by piezoelectric transducer (PET) is realized on a coplanar waveguide (CPW). The effective dielectric constant, propagation constant, etc., of the CPW are varied by the perturbation controlled by a PET. Compared to the perturbation on a microstrip line, published previously, the new CPW device provides 50% more phase shift. View full abstract»

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  • A novel power plane with integrated simultaneous switching noise mitigation capability using high impedance surface

    Publication Year: 2003 , Page(s): 21 - 23
    Cited by:  Papers (139)  |  Patents (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (393 KB) |  | HTML iconHTML  

    A novel technique for suppressing power plane resonance at microwave and radio frequencies is presented. The new concept consists of replacing one of the plates of a parallel power plane pair with a high impedance surface or electromagnetic band gap structure. The combination of this technique with a wall of RC pairs extends the lower edge of the effective bandwidth to dc, and allows resonant mode suppression up to the upper edge of the band-gap. The frequency range for noise mitigation is controlled by the geometry of the HIGP structure. View full abstract»

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  • Smith chart approach to the design of multilayer resistive sheet

    Publication Year: 2003 , Page(s): 24 - 26
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (314 KB) |  | HTML iconHTML  

    The design of the multilayer resistive sheet is often given in some formulae or in some tabulated forms. The electrical engineer or material scientist often cannot visualize how the design really works or the achievable bandwidth. In this paper, we attempt to give a good understanding of the design of the multilayer resistive sheet by using the Smith Chart approach. The Smith Chart approach offers more flexibility to the design of the multilayer resistive sheet, as compared to published formulae or tables. View full abstract»

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  • An equivalent electric field source for wideband FDTD simulations of waveguide discontinuities

    Publication Year: 2003 , Page(s): 27 - 29
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (212 KB) |  | HTML iconHTML  

    Transparent sources are often used in wideband finite-difference time-domain (FDTD) simulations of waveguide discontinuity problems. Direct implementations of transparent sources may not correspond to the original hard source spectrum, or else require auxiliary simulation steps for correction purposes. In this letter, we propose a more direct approach to construct FDTD transparent electric field source-models for waveguides. We also provide an explanation for a "spectrum distortion" phenomenon recently reported for FDTD sources in waveguide problems . The main findings are illustrated by means of FDTD simulations of waveguides operating at Ku-band. View full abstract»

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  • Patent abstracts

    Publication Year: 2003 , Page(s): 30 - 40
    Save to Project icon | Request Permissions | PDF file iconPDF (720 KB)  
    Freely Available from IEEE

Aims & Scope

The IEEE Microwave and Wireless Components Letters (MWCL) publishes three page papers that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals.

Full Aims & Scope