Electronics
Radiation Improvement of Low-Profile Microstrip Antenna by Utilizing AMC Surface for MIMO and Wireless Systems

Hosein Malekpoor; mehdi hamidkhani

Articles in Press, Accepted Manuscript, Available Online from 22 October 2024

https://doi.org/10.22111/ieco.2024.48644.1561

Abstract
  A compact microstrip antenna by applying a parasitic artificial magnetic conductor (AMC), is proposed for facilitating 4G and 5G wireless communications. The antenna design includes microstrip dipoles fed by a T-shaped feedline. Notably, the antenna achieves a measured bandwidth of 5.32-6.73 GHz (with ...  Read More

Electronics
Hardware Structure of an Efficient and Optimal Circuit for Induction Cap Sealing

Bahram Rashidi

Volume 7, Issue 3 , September 2024, , Pages 203-212

https://doi.org/10.22111/ieco.2024.48172.1545

Abstract
  This paper presents the design and hardware implementation of an efficient and optimal induction heating circuit for induction sealing. The circuit has a low implementation cost, so the proposed system with a simple and efficient structure can cover the needs of this technology field. Here, the focus ...  Read More

Electronics
Tuning Spring Constant of a Beam for a Promising Reduction in the Actuation Voltage of a V-Band RF MEMS Switch

Farid Khamouei Touli; Javad Yavand Hasani

Volume 7, Issue 2 , May 2024, , Pages 129-140

https://doi.org/10.22111/ieco.2024.47579.1524

Abstract
  Radiofrequency microelectromechanical system (RF-MEMS) switches are utilized across a broad spectrum of industries, telecommunications, aerospace and smartphone technology.Herein, we proposed a new numerical and simulation analysis approach for spring constant (k) values as the characteristic mechanical ...  Read More

Electronics
Design and Simulation of an Efficient Quaternary Full-Adder Based on Carbon Nanotube Field Effect Transistor

Farzaneh Yousefzadeh Ahari; Mousa Yousefi; Khalil Monfaredi

Volume 7, Issue 2 , May 2024, , Pages 153-164

https://doi.org/10.22111/ieco.2024.47452.1519

Abstract
  The essential reason for implementing multilevel processing systems is to reduce the number of semiconductor elements and hence the complexity of system. Multilevel processing systems are realized much easier by carbon nanotube field effect transistors (CNTFET) than MOSFET transistors due to the CNTFET ...  Read More

Electronics
Design and Implementation of an N-type Integer Phase-locked Loop with Low Phase Noise and Two Output Frequencies at 1 and 4 GHz

Hamid Kazemi Karyani; Esmaeil Najafiaghdam

Volume 7, Issue 1 , March 2024, , Pages 29-39

https://doi.org/10.22111/ieco.2024.46858.1505

Abstract
  This article presents development and implementation of an integer N-type Phase Locked Loop (PLL) module with two output frequencies of 1 and 4 GHz, each having a phase noise better than -110dBC/Hz@10k. The structure has 0 and 10dBm power levels at 1 and 4GHz output frequencies, respectively. Having ...  Read More

Electronics
Lightweight Structure of Random Key Generation for PRESENT Block Cipher

Bahram Rashidi

Volume 7, Issue 1 , March 2024, , Pages 41-51

https://doi.org/10.22111/ieco.2024.47375.1511

Abstract
  In this paper, we design a lightweight and modified random key generation for PRESENT block cipher which is applicable in the encryption of the digital signals. In the block ciphers, the master key is used directly in the encryption process for the data (plaintext). But in this work, a master key (initial ...  Read More

Electronics
Designing and Fabrication of High Frequency Ultrawide Band Passive Phase Shifters with Single Layer Microstrip Structure and Unequal Source and Load Impedances

Habibollah Zolfkhani; Alireza Sharifi

Volume 7, Issue 1 , March 2024, , Pages 73-84

https://doi.org/10.22111/ieco.2024.8241

Abstract
  In this paper, a method is presented to design and implement ultra-wideband phase shifters, in frequency ranges higher than 10 GHz, with fractional bandwidth near a hundred percent. The phase shifter is constructed from microstrip transmission lines and short circuit stubs. In comparison with conventional ...  Read More

Electronics
Design a PLL for Fractional Frequency Synthesizers using DDSM with Reduced Hardware

Leila Jahanpanah; Seyed Ali Sadatnoori; Iman Chaharmahali

Volume 5, Issue 2 , June 2022, , Pages 177-187

https://doi.org/10.22111/ieco.2022.41006.1402

Abstract
  Phase locked loop (PLL) circuits are widely used in fractional frequency synthesizers. In these synthesizers, fractional multiples of the reference frequency can be synthesized, so the reference frequency and the bandwidth of the loop can be increased. This frequency synthesizer is commonly used due ...  Read More

Electronics
A new Mismatch cancelation for Quadrature Delta Sigma Modulator

alireza shamsi

Volume 3, Issue 2 , May 2020, , Pages 196-204

https://doi.org/10.22111/ieco.2019.29632.1167

Abstract
  This paper proposes a new mismatch cancelation technique for quadrature delta-sigma modulators (QDSM). In this approach, a high speed and simple structure dynamic element matching (DEM) based on homogenization and time-division (HTD) is designed. In addition, I and Q digital-to-analog converters (DACs) ...  Read More

Electronics
Numerical Investigation of External Electromagnetic Field Coupling to Coplanar Waveguide

Hamideh Dashti

Volume 3, Issue 2 , May 2020, , Pages 205-211

https://doi.org/10.22111/ieco.2019.29597.1166

Abstract
  In this paper, for the first time, effects of external electromagnetic fields on a coplanar waveguide (CPW) are numerically studied by means of the method of finite elements. Two CPW lines with different geometry and dielectric substrate permittivity are considered. Both lines have characteristic impedance ...  Read More

Electronics
Reconfigurable CT QDSM with mismatch shaping dedicated to multi-mode low-IF receivers

alireza shamsi

Volume 2, Issue 3 , July 2019, , Pages 257-264

https://doi.org/10.22111/ieco.2019.28430.1132

Abstract
  A reconfigurable third-order multi-bit continuous-time quadrature delta-sigma modulator (CT-QDSM) with mismatch error correction is reported in this paper. This modulator is designed for a tri-mode WLAN/WCDMA/GSM Low-IF (Intermediate Frequency) receiver. A three-bit quantizer is utilized to achieve the ...  Read More