scholarly journals Integrated Balanced BPSK Modulator for Millimeter Wave Systems

2007 ◽  
Vol 2007 ◽  
pp. 1-4
Author(s):  
Ashok Mittal ◽  
Asok De
Keyword(s):  
Millimeter Wave ◽  
Incident Wave ◽  
Insertion Loss ◽  
Pulse Width ◽  
Coplanar Line ◽  
Phase Switching ◽  
High Isolation ◽  
Average Loss ◽  
Hybrid Junction ◽  
Signal Output

This paper details the design of integrated balanced PSK modulator using finline coplanar line hybrid junction. The PSK signal output is in suspended stripline with incident wave carrier in finline. Schottky barrier Diode MA4E2037 has been used for modulation. The balanced configuration offers high isolation between the carrier input port and the modulated carrier output port and thus the pulse width variations and amplitude deviations are suppressed. An insertion loss imbalance of±1.5 dB with an average loss of 2 dB in the two switching states has been achieved over 38.9 to 40 GHz. The phase imbalance is±10 degrees with phase switching from 180 to 199 degrees As the PSK output signal is in suspended stripline, two BPSK modulators can be easily combined together to work as QPSK modulator.

scholarly journals Temperature Characterization of Liquid Crystal Dielectric Image Line Phase Shifter for Millimeter-Wave Applications

Crystals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 63
Author(s):  
Henning Tesmer ◽  
Rani Razzouk ◽  
Ersin Polat ◽  
Dongwei Wang ◽  
Rolf Jakoby ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Millimeter Wave ◽  
Insertion Loss ◽  
Phase Shifter ◽  
Ground Plane ◽  
Temperature Dependent ◽  
Differential Phase ◽  
Dependent Behavior ◽  
The Impact ◽  
Temperature Dependent Behavior

In this paper we investigate the temperature dependent behavior of a liquid crystal (LC) loaded tunable dielectric image guide (DIG) phase shifter at millimeter-wave frequencies from 80 GHz to 110 GHz for future high data rate communications. The adhesive, necessary for precise fabrication, is analyzed before temperature dependent behavior of the component is shown, using the nematic LC-mixture GT7-29001. The temperature characterization is conducted by changing the temperature of the LC DIG’s ground plane between −10∘C and 80 ∘C. The orientation of the LC molecules, and therefore the effective macroscopic relative permittivity of the DIG, is changed by inserting the temperature setup in a fixture with rotatable magnets. Temperature independent matching can be observed, while the insertion loss gradually increases with temperature for both highest and lowest permittivity of the LC. At 80 ∘C the insertion loss is up to 1.3dB higher and at −10∘C it is 0.6dB lower than the insertion loss present at 20 ∘C. In addition, the achievable differential phase is reduced with increasing temperature. The impact of molecule alignment to this reduction is shown for the phase shifter and an estimated 85% of the anisotropy is still usable with an LC DIG phase shifter when increasing the temperature from 20 ∘C to 80 ∘C. Higher reduction of differential phase is present at higher frequencies as the electrical length of the phase shifter increases. A maximum difference in differential phase of 72∘ is present at 110 GHz, when increasing the temperature from 20 ∘C to 80 ∘C. Nevertheless, a well predictable, quasi-linear behavior can be observed at the covered temperature range, highlighting the potential of LC-based dielectric components at millimeter wave frequencies.

Low-Loss 3D-Coplanar Line Structure for Millimeter Wave Applications Using Laser Direct Structuring Technology

2021 ◽  
Author(s):  
S. Seewald ◽  
D. Manteuffel ◽  
M. Wolf ◽  
M. Barth ◽  
W. Eberhardt ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Low Loss ◽  
Coplanar Line ◽  
Line Structure

scholarly journals Suppression of insertion loss by slit patterning of a magnetic film in a CoFeB/polyimide hybrid thin-film coplanar line for a rf impedance matching device

2006 ◽  
Vol 99 (8) ◽  
pp. 08P508 ◽  
Author(s):  
Hidetoshi Nakayama ◽  
Tomohiro Yamamoto ◽  
Yuko Mizoguchi ◽  
Masahiro Nakazawa ◽  
Toshiro Sato ◽  
...  
Keyword(s):  
Thin Film ◽  
Insertion Loss ◽  
Impedance Matching ◽  
Magnetic Film ◽  
Hybrid Thin Film ◽  
Coplanar Line

scholarly journals Perancangan Prototipe Transmitter Beacon Black Box Locator Acoustic 37.5 kHz Pingers

2018 ◽  
Vol 4 (2) ◽  
pp. 170
Author(s):  
RUSTAMAJI RUSTAMAJI ◽  
KANIA SAWITRI ◽  
RUDI GUNAWAN
Keyword(s):  
Pulse Width ◽  
Black Box ◽  
Pulse Repetition ◽  
Acoustic Vibrations ◽  
Colpitts Oscillator ◽  
Amplifier Circuit ◽  
Oscillator Circuit ◽  
Signal Output ◽  
Transmitted Signal ◽  
Repetition Interval

ABSTRAKPingers transmitter berfungsi untuk memancarkan sinyal atau getaran pulsa akustik pada black box. Frekuensi sinyal yang dipancarkan sebesar 37,5 kHz yang dimodulasikan oleh pulsa dengan durasi 10 ms setiap interval 1 second. Modulasi yang digunakan adalah modulasi on off keying. Dalam penelitian ini dibuat perancangan pingers transmitter yang tersusun atas rangkaian osilator, timer, inverter, switch dan rangkaian amplifier. Frekuensi 37,5 kHz tersebut dibangkitkan oleh rangkaian osilator colpitts, sedangkan lebar pulsa dengan durasi 10 ms dan pengulangan pulsa setiap interval 1 second dibangkitkan oleh rangkaian timer. Berdasarkan perancangan yang telah dibuat, output sinyal yang dihasilkan oleh prototipe pingers transmitter tersebut sebesar 37,69 kHz dengan lebar pulsa 9,8 ms setiap interval 1 second.Kata kunci: Black box, pingers transmitter, on off keying. ABSTRACTPingers transmitter is used to emits a signal or pulse of acoustic vibrations  in black box. The frequency of the transmitted signal is 37.5 kHz which is modulated by pulses with a duration of 10 ms every interval 1 second. The modulation that used this research is on off keying modulation. In this research, made the design of pingers transmitter which arrange of the oscillator circuit,timer, inverter, switch, and amplifier circuit. The 37.5 kHz frequency is generated by the colpitts oscillator circuit, while the pulse width with a duration of 10 ms,and each pulse repetition interval of 1 second generated by timer circuit. Based on the design that have made, signal output from the pingers transmitter prototype is 37.69 kHz, with the pulse width 9.8 ms every 1 second interval.Keywords: Black box, pingers transmitter, on off keying.

scholarly journals Design and simulation of low actuation voltage RF MEMS shunt capacitive switch with serpentine flexures&rectangular perforations

2018 ◽  
Vol 7 (2.31) ◽  
pp. 4 ◽  
Author(s):  
K Jayavardhani ◽  
S K. Noureen Fathima ◽  
K Bhima Sankar ◽  
K Kavya Sri ◽  
S Sunithamani
Keyword(s):  
Insertion Loss ◽  
Rf Mems ◽  
Actuation Voltage ◽  
Air Gap ◽  
Spring Constant ◽  
Squeeze Film ◽  
Capacitive Switch ◽  
High Isolation ◽  
Low Insertion Loss ◽  
Rf Performance

This paper presents the design and simulation of RF MEMS shunt capacitive switch with low actuation voltage, low insertion loss and high isolation. Actuation voltage depends on the parameters like air gap, spring constant and actuation area. In this design, we have proposed a serpentine meander structure to reduce the spring constant of the beam thus reducing actuation voltage. The rectangular perforation is used to reduce the squeeze film damping by decreasing the mass of the switch. The proposed switch has attained a low actuation voltage of 4.5V for a displacement of 0.84μm. The air gap between the beam and the dielectric is 1μm. This radio frequency (RF) MEMS shunt switch is designed and simulated using COMSOL Multiphysics 5.2. The RF performance of the shunt switch is analyzed in Ansoft HFSS 13 and the results show that the return loss was about -13.50 dB at 20GHz in the OFF state and -8.5 dB at 18 GHz in the ON state. A high isolation of -36.00 dB was achieved in the OFF state at a frequency of 5GHz and a low insertion loss is obtained. The results show that the switch is suitable for wireless applications operating in the frequency range from 5 to 20GHz. 

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