scholarly journals Construction Features of the Transceiver Antenna-Waveguide Device of К/Ka-Band Communication Systems

2020 ◽  
Vol 7 (4) ◽  
pp. 56-62
Author(s):  
S. I. Boychuk ◽  
◽  
V. I. Demchenko ◽  
A. E. Korovkin ◽  
A. V. Shipulin ◽  
...  
Keyword(s):  
Transmission Line ◽  
Communication Systems ◽  
Phase Shifting ◽  
Polarization Conversion ◽  
Ka Band ◽  
Higher Types ◽  
Waveguide Transmission ◽  
Waveguide Device

The paper presents the results of the development of an antenna and waveguide transmission line providing reception and transmission of signals in the extended K/Ka-band with an autotracking mode implemented on the excitation of higher types of waves. The indicators efficiency of the feed, parameters of the waveguide device for extracting error signals, frequency duplexer, phase-shifting sections, and polarization conversion devices were determined.

An Improved Design for Ka-Band Phase Shifter Using Distributed MEMS Transmission Line Structure

PIERS Online ◽  
2005 ◽  
Vol 1 (5) ◽  
pp. 594-597 ◽  
Author(s):  
Boshi Jin ◽  
Haoyuan She ◽  
Yuemei Qin ◽  
Jiahui Fu ◽  
Qun Wu ◽  
...  
Keyword(s):  
Transmission Line ◽  
Phase Shifter ◽  
Ka Band ◽  
Line Structure ◽  
Improved Design

Optimization of Scattering Parameters through Numerical Investigation of One-bit RF MEMS Switch over Ku, K and Ka Band

2020 ◽  
Vol 12 ◽  
Author(s):  
Pampa Debnath ◽  
Ujjwal Mondal ◽  
Arpan Deyasi
Keyword(s):  
Transmission Line ◽  
Numerical Investigation ◽  
Line Width ◽  
Insertion Loss ◽  
Return Loss ◽  
Rf Mems ◽  
Rf Mems Switch ◽  
Ka Band ◽  
Mems Switch ◽  
Overlap Area

Aim:: Computation of loss factors for one-bit RF MEMS switch over Ku, K and Ka-band for two different insulating substrates. Objective:: Numerical investigation of return loss, insertion loss, isolation loss are computed under both actuated and unactuated states for two different insulating substrates of the 1-bit RF MEMS switch, and corresponding up and down-capacitances are obtained. Methods:: The unique characteristics of a 1-bit RF MEMS switch of providing higher return loss under both actuated and unactuated states and also of isolation loss with negligible insertion loss makes it as a prime candidate for phase shifter application. This is presented in this manuscript with a keen focus on improvement capability by changing transmission line width, and also of overlap area; where dielectric constant of the substrate also plays a vital role. Results:: The present work exhibits very low down-capacitance over the spectrum whereas considerable amount of up-capacitance. Also when overall performance in terms of all loss parameters are considered, switch provides very low insertion loss, good return loss under actuated state and standard isolation loss. Conclusion:: Reduction of transmission line width of about 33% improved the performance of the switch by increasing isolation loss. Isolation loss of -40 dB is obtained at actuated condition in higher microwave spectra for SiO 2 at higher overlap area. Down capacitance of ~ 1dB is obtained which is novel as compared with other published literature. Moreover, a better combination of both return loss, isolation loss and insertion loss are reported in this present work compared with all other published data so far.

Low Loss Gap Waveguide Transmission line and Transitions at 220–320 GHz Using Dry Film Micromachining

2021 ◽  
pp. 1-1
Author(s):  
Sadia Farjana ◽  
Mohammadamir Ghaderi ◽  
Ashraf Uz Zaman ◽  
Sofia Rahiminejad ◽  
Per Lundgren ◽  
...  
Keyword(s):  
Transmission Line ◽  
Low Loss ◽  
Waveguide Transmission ◽  
Dry Film

Research of Methods for Suppression of Parasitic Components in RF Quadrature Modulator Output Signal Spectrum

2021 ◽  
Vol 26 (1) ◽  
pp. 54-63
Author(s):  
T.Yu. Krupkina ◽  
◽  
V.V. Losev ◽  
L.V. Nedashkovskiy ◽  
Yu.A. Chaplygin ◽  
...  
Keyword(s):  
Output Signal ◽  
Communication Systems ◽  
Point Of View ◽  
Phase Shifting ◽  
Signal Spectrum ◽  
Polyphase Filter ◽  
Digital To Analog Converters ◽  
Quadrature Modulator ◽  
Phase Amplitude ◽  
Parasitic Components

The quadrature modulators and demodulators are widely used to create modern wireless communication systems. It is important to ensure high quality of the transmitted signals in order to have the exchange of information without loss or failure. From the point of view of the spectral decomposition of the signal (Fourier series decomposition), the useful component of the spectrum must be much larger than all other components. The carrier (LO frequency and spurious sideband are the most critical and undesirable quadrature modulator output signal spectral components. In the work, in the course of the research using the methods of suppressing the parasitic components, based on minimizing phase, amplitude and current imbalances in various nodes of the quadrature modulator circuit, have been revealed. In order to realize suppression, the special digital-to-analog converters are used in conjunction with a polyphase filter on varicaps, a phase-shifting block and current sources. The effectiveness of these methods is confirmed by the achievement of suppression of parasitic components in prototypes of 50 dB or more. It has been stated that the phase unbalance minimization is more effective than the amplitude unbalance minimization to sideband suppression. It has been revealed that the use of a phase-shifting block is a more suitable architecture to control the phase unbalance. The obtained results can be useful in the design of high-precision radio frequency units for various purposes.

Dual-Band Ultrathin Meta-Array for Polarization Conversion in Ku/Ka-Band With Broadband Transmission

2020 ◽  
Vol 19 (5) ◽  
pp. 856-860 ◽  
Author(s):  
Ayesha Kosar Fahad ◽  
Cunjun Ruan ◽  
Rabia Nazir ◽  
Tanveer Ul Haq ◽  
Wenlong He
Keyword(s):  
Dual Band ◽  
Polarization Conversion ◽  
Ka Band
Sign in / Sign up

Export Citation Format

Share Document