1,453 research outputs found
Quadrature Phase Shift Keying (QPSK) Modulator Design using Multi-Port Network in Multilayer Microstrip-Slot Technology for Wireless Communication Applications
The design of the quadrature phase shift keying (QPSK) modulator by using a multi-port network is proposed in this article for the use in wireless communication applications. The multi-port network is in the form of multilayer microstrip-slot technology. This multi-port network is composed of three 3-dB rectangular-shaped directional couplers with virtual stubs and an equal power division divider with in-phase characteristic. The design is performed by applying a full-wave electromagnetic simulation software, CST Microwave Studio (CST MWS). Keysight’s Advanced Design System (ADS) is applied in analyzing and evaluating the QPSK constellation of the proposed modulator. This comparatively small size of proposed design has been fabricated, and its wideband performance of 2 to 6 GHz is verified
Microwave characterization of slotline on high resistivity silicon for antenna feed network
Conventional silicon wafers have low resistivity and consequently unacceptably high value of dielectric attenuation constant. Microwave circuits for phased array antenna systems fabricated on these wafers therefore have low efficiency. By choosing a silicon substrate with sufficiently high resistivity it is possible to make the dielectric attenuation constant of the interconnecting microwave transmission lines approach those of GaAs or InP. In order for this to be possible, the transmission lines must be characterized. In this presentation, the effective dielectric constant (epsilon sub eff) and attenuation constant (alpha) of a slotline on high resistivity (5000 to 10 000 ohm-cm) silicon wafer will be discussed. The epsilon sub eff and alpha are determined from the measured resonant frequencies and the corresponding insertion loss of a slotline ring resonator. The results for slotline will be compared with microstrip line and coplanar waveguide
On the Phase Response and Radiation Efficiency of the Complementary Strip-Slot as an Array Element
The complementary strip-slot element is a broadlymatched
microstrip radiator that has been used to design innovative
series-fed arrays. It consists of a microstrip series-fed slot
that have its complementary stub on the layer of the microstrip
and aligned to the slot. In this contribution, the influence of the
strip and slot geometry on its performance is studied through the
analysis of four different designs. The obtained results highlight
the possibility of controlling the radiation efficiency or the phase
response, without compromising the broad matching. Therefore,
potential series-fed arrays built with this element can exploit this
feature to set the magnitude and phase of the excitations with
certain flexibility.Universidad de Málaga. Campus de Excelencia Internacional AndalucĂa Tech. This work was supported by the Spanish Ministerio de
Ciencia e Innovaci ´on (Programa Consolider-Ingenio 2010)
under Grant CSD2008-00066, EME
The Experimental UWB Link
The experimental results from simple ultra
wideband link are presented. The UWB link consisting of typical
broadband microwave circuits built of commercially available
components is able to send and detect unmodulated broadband
electrical pulses with 20 MHz pulse repetition frequency. The
system operates with approximately 60% of fractional
bandwidth in 4GHz band with spectral density of -140dBW/Hz
Scalable background-limited polarization-sensitive detectors for mm-wave applications
We report on the status and development of polarization-sensitive detectors
for millimeter-wave applications. The detectors are fabricated on
single-crystal silicon, which functions as a low-loss dielectric substrate for
the microwave circuitry as well as the supporting membrane for the
Transition-Edge Sensor (TES) bolometers. The orthomode transducer (OMT) is
realized as a symmetric structure and on-chip filters are employed to define
the detection bandwidth. A hybridized integrated enclosure reduces the
high-frequency THz mode set that can couple to the TES bolometers. An
implementation of the detector architecture at Q-band achieves 90% efficiency
in each polarization. The design is scalable in both frequency coverage, 30-300
GHz, and in number of detectors with uniform characteristics. Hence, the
detectors are desirable for ground-based or space-borne instruments that
require large arrays of efficient background-limited cryogenic detectors.Comment: 7 pages, 3 figures, Presented at SPIE Astronomical Telescopes and
Instrumentation 2014: Millimeter, Submillimeter, and Far-Infrared Detectors
and Instrumentation for Astronomy VII. To be published in Proceedings of SPIE
Volume 915
A Multisection Broadband Impedance Transforming Branch-Line Hybrid
Measurements and design equations for a two section impedance transforming
hybrid suitable for MMIC applications and a new method of synthesis for
multisection branch-line hybrids are reported. The synthesis method allows the
response to be specified either of Butterworth or Chebyshev type. Both
symmetric (with equal input and output impedances) and non-symmetric (impedance
transforming) designs are feasible. Starting from a given number of sections,
type of response, and impedance transformation ratio and for a specified
midband coupling, power division ratio, isolation or directivity ripple
bandwidth, the set of constants needed for the evaluation of the reflection
coefficient response is first calculated. The latter is used to define a
driving point impedance of the circuit, synthesize it and obtain the branch
line immittances with the use of the concept of double length unit elements
(DLUE). The experimental results obtained with microstrip hybrids constructed
to test the validity of the brute force optimization and the synthesized
designs show very close agreement with the computed responses.Comment: 6 pages and 14 figures. Published in IEEE Transactions on Microwave
Theory and Technique
Coplanar waveguide feeds for phased array antennas
The design and performance is presented of the following Coplanar Waveguides (CPW) microwave distribution networks for linear as well as circularly polarized microstrip patches and dipole arrays: (1) CPW/Microstrip Line feed; (2) CPW/Balanced Stripline feed; (3) CPW/Slotline feed; (4) Grounded CPW/Balanced coplanar stripline feed; and (5) CPW/Slot coupled feed. Typical measured radiation patterns are presented, and their relative advantages and disadvantages are compared
Silicon-Based Antenna-Coupled Polarization-Sensitive Millimeter-Wave Bolometer Arrays for Cosmic Microwave Background Instruments
We describe feedhorn-coupled polarization-sensitive detector arrays that
utilize monocrystalline silicon as the dielectric substrate material.
Monocrystalline silicon has a low-loss tangent and repeatable dielectric
constant, characteristics that are critical for realizing efficient and uniform
superconducting microwave circuits. An additional advantage of this material is
its low specific heat. In a detector pixel, two Transition-Edge Sensor (TES)
bolometers are antenna-coupled to in-band radiation via a symmetric planar
orthomode transducer (OMT). Each orthogonal linear polarization is coupled to a
separate superconducting microstrip transmission line circuit. On-chip
filtering is employed to both reject out-of-band radiation from the upper band
edge to the gap frequency of the niobium superconductor, and to flexibly define
the bandwidth for each TES to meet the requirements of the application. The
microwave circuit is compatible with multi-chroic operation. Metalized silicon
platelets are used to define the backshort for the waveguide probes. This
micro-machined structure is also used to mitigate the coupling of out-of-band
radiation to the microwave circuit. At 40 GHz, the detectors have a measured
efficiency of 90%. In this paper, we describe the development of the 90 GHz
detector arrays that will be demonstrated using the Cosmology Large Angular
Scale Surveyor (CLASS) ground-based telescope
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