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Microwave and Wireless Components Letters, IEEE

Issue 6 • Date June 2001

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Displaying Results 1 - 12 of 12
  • 164-GHz MMIC HEMT doubler

    Page(s): 241 - 243
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (52 KB) |  | HTML iconHTML  

    In this paper, a MMIC frequency doubler based on an InP HEMT and grounded CPW (GCPW) technology is reported. The doubler demonstrated a conversion loss of only 2 dB and output power of 5 dBm at 164 GHz. The 3 dB output power bandwidth is 14 GHz, or 8.5%. This is the best reported result for a MMIC HEMT doubler above 100 GHz. View full abstract»

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  • Low-phase noise AlGaN/GaN FET-based voltage controlled oscillators (VCOs)

    Page(s): 244 - 245
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (47 KB) |  | HTML iconHTML  

    The first report of AlGaN/GaN HEMT-based voltage controlled oscillators (VCOs) is presented. Varactor-tuned oscillators implemented using distributed networks oscillate at 6 GHz with high output power (0.5 W), low-phase noise (-92 dBc/Hz SSB noise at 100 kHz offset), and high-tuning bandwidth (10%). The measured phase noise of AlGaN/GaN FETs is compared to the phase noise of GaAs FET and GaAs HBTs at 6 GHz, indicating the AlGaN/GaN FET exhibits equivalent SSB noise to GaAs FETs. These results indicate high power AlGaN/GaN-based VCOs may be used to simplify the line up in a communication radio, while improving the overall efficiency of the radio. View full abstract»

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  • High isolation, planar filters using EBG substrates

    Page(s): 246 - 248
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (57 KB) |  | HTML iconHTML  

    The concept of electromagnetic bandgaps (EBGs) has been utilized to develop a high-quality filter that can be integrated monolithically with other components due to a reduced height, planar design. Coupling adjacent defect elements in a periodic lattice creates a filter characterized by its ease of fabrication, high-Q performance, high-port isolation, and integrability to planar or 3-D circuit architectures. The filter proof of concept has been demonstrated in a metallo-dielectric lattice. The measured and simulated results of 2-, 3-, and 6-pole filters are presented at 10.7 GHz. View full abstract»

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  • A 1.9-GHz DECT CMOS power amplifier with fully integrated multilayer LTCC passives

    Page(s): 249 - 251
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (67 KB) |  | HTML iconHTML  

    We present the first demonstration of a CMOS power amplifier (PA) utilizing fully integrated multilayer low-temperature co-fired ceramic (LTCC) high-Q passives for 1.9-GHz digital European cordless telecommunications (DECT) applications. The inductor and capacitor library were built in a multilayer LTCC board using a compact topology. An inductor Q-factor as high as 100 with a self-resonant frequency (SRF) as high as 8 GHz was demonstrated. Measured results of the CMOS-LTCC PA show good agreement with the simulated results exhibiting 48% power added efficiency, 26-dBm output power and 17-dB gain at 1.9 GHz with a 3.3-V drain supply voltage. This result is the first significant step toward a compact DECT transceiver module development utilizing fully integrated multilayer LTCC passives and a standard CMOS technology. View full abstract»

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  • Low-loss sapphire waveguides for 75-110 GHz frequency range

    Page(s): 252 - 254
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (52 KB) |  | HTML iconHTML  

    Low-loss dielectric waveguides are promising for use instead of metal ones, but problems in transitions have to be overcome. A simple and effective structure made of a monocrystalline sapphire waveguide has been designed. Experimental results at 75-110 GHz indicate good matching with metal waveguides (VSWR /spl les/1.13) and low insertion loss (0.05-0.35 dB for 47 mm dielectric section). View full abstract»

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  • A high-Q reconfigurable planar EBG cavity resonator

    Page(s): 255 - 257
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (70 KB) |  | HTML iconHTML  

    A reconfigurable planar electromagnetic bandgap (EBG) cavity resonator has been designed, fabricated, and tested. The resonator, based on a microstrip-coupled cavity constructed with periodic metallic post side walls, resonates at 10.60 GHz or 8.63 GHz, depending on the state of two rows of switchable post elements. Fabricated on 0.031 inch 5880 Duroid, the resonator exhibits Qs of 348 and 274 for the 10.60 GHz and 8.63 GHz resonances, respectively. In addition to the reasonably high Qs achievable with this design, the circuit utilizes standard printed circuit board (PCB) fabrication techniques and is 100% compatible with commercial PCB processes, enabling low-cost mass production. View full abstract»

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  • A novel microstrip ring hybrid incorporating a PBG cell

    Page(s): 258 - 260
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (57 KB) |  | HTML iconHTML  

    An experimental investigation of a novel compact microstrip 180/spl deg/ ring hybrid incorporating a one-dimensional (1-D) slow-wave structure, in the form of perforations on the ring itself, is presented. The size of the hybrid is reduced by 23% due to the slow-wave effect, and this size reduction technique has potential applications in MICs and MMICs. The measured insertion loss is comparable to that of a conventional microstrip hybrid. View full abstract»

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  • A novel periodic electromagnetic bandgap structure for finite-width conductor-backed coplanar waveguides

    Page(s): 261 - 263
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (82 KB) |  | HTML iconHTML  

    The one-dimensional (1-D) periodic electromagnetic bandgap (EBG) structure for the finite-width conductor-backed coplanar waveguide (FW-CBCPW) is proposed. Unlike the conventional EBG structures for the microstrip line and the coplanar waveguide (CPW), which are typically placed on one of the signal strips and the ground plane, this EBG cell is etched on both the signal strip and the upper ground plane of FW-CBCPW resulting in a novel circuit element. The equivalent circuit is also used to model the EBG cell. Measured and full-wave simulated results show that the cell exhibits remarkable stopband effect. The low-pass filter with lower cutoff frequency and wider rejection bandwidth is constructed from a serial connection of the EBG cells. The effect of back metallization on the guiding characteristic is also discussed. Compared to the published EBG cells, the proposed structure has the advantages of relative flexibility, higher compactness, lower radiation loss, and easier integration with the uniplanar circuits. View full abstract»

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  • Direct synthesis of folded symmetric resonator filters with source-load coupling

    Page(s): 264 - 266
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (49 KB) |  | HTML iconHTML  

    A direct synthesis technique of coupled symmetric resonator filters with source-load coupling is presented. An examination of the implications of power conservation on the possible solutions to the synthesis problem is examined. It is shown that at least two different coupling matrices whose entries differ not only in signs but in magnitude, as well, can be extracted. The two matrices have the same coupling and routing scheme. Typical examples of synthesized filters are presented to document the validity of the technique. View full abstract»

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  • The time-frequency interpretation for transient evolution of wave propagation through dispersive medium

    Page(s): 267 - 269
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (80 KB) |  | HTML iconHTML  

    The propagation of electromagnetic waves in a linear, dispersive Lorentz medium is calculated using the finite-difference time-domain (FDTD) method; their time-frequency (TF) characteristics are studied using the Gabor extension. Numerical results show that the TF spectrum gives a clear interpretation for transient evolution of ultra wideband pulse propagation through a Lorentz medium. View full abstract»

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  • Efficient analysis of microstrip lines including edge singularities in spatial domains

    Page(s): 270 - 272
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (55 KB) |  | HTML iconHTML  

    Microstrip lines are analyzed by considering edge-singular behavior using closed-form Green's functions in a spatial domain. A Maxwell function which incorporates the appropriate edge conditions of the line is introduced for the derivations of a transverse correlation function. From calculations of excess lengths of an open-end discontinuity, the results of the proposed method using the edge conditions are in better agreement with the quasistatic results than those of transverse uniform current variations for conductor strips with relatively wider width. View full abstract»

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  • Patent abstracts

    Page(s): 273 - 280
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    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