scholarly journals An Area-efficient Microstrip Diplexer with a Novel Structure and Low Group Delay for Microwave Wireless Applications

2020 ◽  
Vol 8 (2) ◽  
pp. 71-77
Author(s):  
Salah I. Yahya ◽  
Abbas Rezaei
Keyword(s):  
Group Delay ◽  
Design Method ◽  
Wireless Applications ◽  
Novel Structure ◽  
Lc Circuit ◽  
Simulation Results ◽  
Group Delays ◽  
Insertion Losses ◽  
Better Than ◽  
Good Agreement

In this work, a novel structure of a microstrip diplexer consisting of coupled patch cells is presented. It works at 2.5 GHz and 4.7 GHz for wireless applications. The proposed structure is well miniaturized with a compact area of 0.015 λg2, fabricated on 0.787 mm substrate height. It has two wide fractional bandwidths (FBWs) of 28% and 17.9% at the lower and upper channels, respectively. Another feature of the proposed design is the low group delays, which are better than 0.4 ns for both channels. Moreover, the designed diplexer can suppress the harmonics up to 10 GHz. Meanwhile, the insertion losses at both channels are low. The design method is based on proposing an approximated equivalent LC circuit of a novel basic resonator. The information about the resonator behavior is extracted from the even and odd modes analysis of the proposed equivalent LC circuit. Finally, our introduced diplexer is fabricated and measured to verify the simulation results, where the simulated and measured results are in good agreement.

Design of a microstrip dual-frequency diplexer using microstrip cells analysis and coupled lines components

2017 ◽  
Vol 9 (7) ◽  
pp. 1467-1471 ◽  
Author(s):  
Leila Noori ◽  
Abbas Rezaei
Keyword(s):  
General Structure ◽  
Basic Information ◽  
Dual Frequency ◽  
Wireless Applications ◽  
Resonance Frequencies ◽  
Measurement Results ◽  
Coupled Lines ◽  
Lc Circuit ◽  
Insertion Losses ◽  
Good Agreement

In this paper, a microstrip diplexer composed of two similar resonators is designed. The proposed resonator is consisting of four microstrip cells, which are connected to a coupled lines structure. In order to select a suitable geometric structure, first, all cells are assumed as undefined structures where there is a lack of basic information about their geometry and dimensions. Then, an equivalent LC circuit of the coupled lines is introduced and analyzed to estimate the general structure of the resonator respect to a requested resonance frequency. The proposed diplexer is designed to operate at 2.36 and 4 GHz for wireless applications. The insertion losses (S21 and S31) are decreased significantly at the resonance frequencies, so that they are 0.2 and 0.4 dB at 2.36 and 4 GHz, respectively. The designed diplexer is fabricated and measured and the measurement results are in a good agreement with the simulations.

scholarly journals A balanced-to-balanced directional coupler based on branch-slotline coupled structure

Frequenz ◽  
2020 ◽  
Vol 74 (11-12) ◽  
pp. 427-433
Author(s):  
Yaxin Liu ◽  
Feng Wei ◽  
Xiaowei Shi ◽  
Cao Zeng
Keyword(s):  
Directional Coupler ◽  
Return Loss ◽  
Design Method ◽  
Differential Mode ◽  
Arbitrary Power ◽  
Measurement Results ◽  
Transition Structures ◽  
Coupled Structures ◽  
Better Than ◽  
Good Agreement

AbstractIn this paper, a balanced-to-balanced (BTB) branch-slotline directional coupler (DC) is firstly presented, which can realize an arbitrary power division ratios (PDRs). The coupler is composed by microstrip-to-slotline (MS) transition structures and branch-slotline coupled structures. The single-ended to balanced-ended conversion is simplified and easy to implemented by the MS transition structures, which intrinsically leads to the differential-mode (DM) transmission and common-mode (CM) suppression. Moreover, the different PDRs which are controlled by the widths of branch-slotlines can be achieved. In order to verify the feasibility of the proposed design method, two prototype circuits of the proposed coupler with different PDRs are fabricated and measured. The return loss and the isolation of two designs are all better than 10 dB. Moreover, the CM suppressions are greater than 35 dB. A good agreement between the simulation and measurement results is observed.

scholarly journals Design and fabrication of a compact microstrip triplexer for wimax and wireless applications

2020 ◽  
Vol 41 (1) ◽  
Author(s):  
Abbas Rezaei ◽  
Salah I. Yahya ◽  
Leila Noori ◽  
Mohd Haizal Jamaluddin
Keyword(s):  
Wireless Applications ◽  
Novel Structure ◽  
Resonance Frequencies ◽  
Coupled Lines ◽  
Insertion Losses

A novel structure to design a microstrip triplexer for wireless and WiMAX applications is presented. To obtain a compact microstrip layout, step impedance resonators and coupled lines are used. The introduced triplexer has a size of 0.35λg×0.26λg, where λg is calculated at 2.3 GHz. Also, the obtained insertion losses are 0.78 dB, 1.1 dB and 0.62 dB at 2.3 GHz, 3.2 GHz and 3.6 GHz, respectively. The LC model of the presented resonator is investigated to tune three resonance frequencies by calculating numerical values of inductors and capacitors. Finally, the designed triplexer is simulated and measured.

A Novel Passive Wireless Humidity Sensor Based on a Dual-Metal Inductor

2014 ◽  
Vol 609-610 ◽  
pp. 972-976 ◽  
Author(s):  
Guo Li ◽  
Jian Qiu Huang ◽  
Cong Zhang ◽  
Li Feng Wang ◽  
Qing An Huang
Keyword(s):  
Resonant Frequency ◽  
Humidity Sensor ◽  
Metal Structure ◽  
Fabrication Process ◽  
Wireless Applications ◽  
Novel Structure ◽  
Lc Circuit ◽  
Dual Metal

This paper describes a wireless, passive humidity sensor, based upon an inductor-capacitor circuit. An inductor with a dual-metal structure is employed to reduce the size of the chip and decrease the complexity of the process. This paper analyzes the shortcomings of conventional sensors and gives a novel structure to overcome these disadvantages, and also use ADS to simulate and verify the feasibility of the new structure. Finally this paper presents a detail fabrication process of this novel sensor. According to the wireless applications, the LC resonant frequency of the LC circuit was designed at 30 ~ 150 and 350~450MHz.

New Microstrip Diplexer for Recent Wireless Applications

2018 ◽  
Vol 7 (3.4) ◽  
pp. 96 ◽  
Author(s):  
Yaqeen S. Mezaal ◽  
Seham A. Hashim ◽  
Aqeel H.Al-fatlawi ◽  
Hussein A. Hussein
Keyword(s):  
Insertion Loss ◽  
Return Loss ◽  
Design Method ◽  
Open Loop ◽  
Coupled Resonators ◽  
Wireless Applications ◽  
Frequency Responses ◽  
Operating Band ◽  
Dual Channel ◽  
Better Than

In this study, dual-channel diplexer using microstrip open loop coupled resonators has been designed and simulated; each channel has two operating band frequencies. This microstrip diplexer is designed for (1.424/1.732GHz) for first channel and (2.014/2.318GHz) for second channel. The simulated results for this device have insertion loss (1.8 and 1 dB) at load 1, and (1.5 and 3 dB) at load 2. Additionally, it has reasonable return loss magnitudes better than 10 dB and effective isolation between channels of35 dB. The proposed design has shown an uncomplicated topology, an effectual design method, small circuit size and narrowband frequency responses that are fitting for multi service wireless schemes.  

A compact parallel coupled meander lines shaped composite right/left-handed transmission line (CRLH-TL) based symmetric quasi-0 dB coupler

Frequenz ◽  
2020 ◽  
Vol 74 (9-10) ◽  
pp. 295-307
Author(s):  
Abhishek Kumar ◽  
Dileep Kumar Upadhyay ◽  
Srikanta Pal
Keyword(s):  
Transmission Line ◽  
Circuit Model ◽  
Frequency Range ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Left Handed ◽  
Lc Circuit ◽  
Better Than ◽  
Good Agreement ◽  
Meander Lines

AbstractIn this paper, parallel coupled meander lines (PCML) composite right/left-handed transmission line (CRLH-TL) based symmetrical quasi-0 dB coupled-line coupler is presented. Proposed coupler shows measured backward wave coupling level of 0.81 dB at frequency of 6.17 GHz with 3 dB fractional bandwidth (FBW) of 12.64%. Throughout the 3 dB frequency range (5.78–6.56 GHz), isolation and insertion loss of the coupler is better than 24 dB. Overall size of the proposed coupler is 19.6 × 12.1 mm. An equivalent lumped LC circuit model of the coupler is demonstrated. Measured results of the coupler show good agreement with the electromagnetic (EM) simulated and lumped LC circuit model simulated results, which validates proposed coupler design and its performance.

A Design Method for IIR and FIR Digital Notch Filter Used to sEMG

2012 ◽  
Vol 263-266 ◽  
pp. 184-187
Author(s):  
Lin Li ◽  
Jian Hui Wang ◽  
Shuai Ban
Keyword(s):  
Design Method ◽  
Notch Filter ◽  
Recognition System ◽  
Non Invasive ◽  
Bioelectric Signal ◽  
Digital Notch Filter ◽  
Simulation Results ◽  
And Control ◽  
Better Than ◽  
Semg Signals

Surface electromyography (sEMG) signals, a non-invasive bioelectric signal, can be used for the rehabilitation and control of artificial extremities. But this signal is so weak that the electrical voltages ranging from -5 to +5 mv. In order to eliminate the 50Hz noise included in sEMG and hold details of the signal, IIR50HZ notch filter and FIR 50Hz notch filter are design. The compared simulation results show that the application of FIR 50Hz is better than IIR 50Hz in sEMG patter recognition system.

Quintuple band circular monopole antenna with innovative 3-D printed PLA substrate for wireless applications

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ashraf E. Ahmed ◽  
Wael A.E. Ali ◽  
Sudipta Das
Keyword(s):  
Polylactic Acid ◽  
Monopole Antenna ◽  
Design Concept ◽  
Experimental Results ◽  
Printed Antenna ◽  
Wireless Applications ◽  
Innovative Technique ◽  
Compact Size ◽  
Simulation Results ◽  
Good Agreement

Abstract In this paper, a circular antenna with a 3-D printed substrate is introduced to achieve a multiband behavior. The circular antenna is matched using a key-shaped stub located on the perimeter of the designed antenna. The 3-DP circular antenna adopted the apollonian gasket technique to perform the multi-circular cuttings in the Polylactic Acid (PLA) substrate as an innovative technique to obtain quintuple bands. The proposed antenna is designed to operate for Bluetooth, WLAN, WiMAX, and other wireless applications in S-band and C-band. The designed antenna has a compact size of 61.1 × 43.6 × 1 mm3. The prototype of the suggested 3-D printed antenna is fabricated and measured to confirm the simulation results. A good agreement is evident between simulation and experimental results which validates the design concept.

scholarly journals Design and Fabrication of a Novel Ultra Compact Microstrip Diplexer Using Interdigital and Spiral Cells

2021 ◽  
Vol 9 (1) ◽  
pp. 103-108
Author(s):  
Salah I. Yahya ◽  
Abbas Rezaei
Keyword(s):  
Mobile Communications ◽  
Dielectric Substrate ◽  
Dual Band ◽  
Novel Structure ◽  
Compact Size ◽  
Resonance Frequencies ◽  
Measurement Results ◽  
Group Delays ◽  
Insertion Losses ◽  
First Time

A dual-band bandpass-bandpass microstrip diplexer with very small size and good performance is designed in this work. The proposed diplexer has a novel structure which is introduced for the first time in this paper. In comparison with the previously reported diplexers, it occupies the most compact size of 0.002 λg2 (226.7 mm2), fabricated on 0.787 mm dielectric substrate height. The resonance frequencies of the presented diplexer are located at 0.76 GHz and 1.79 GHz making it suitable for the global system for mobile communications (GSM) applications. It has a wide flat channels with two fractional bandwidths (FBWs) of 41.1% and 50%. Another feature of the proposed diplexer is its ability to suppress the harmonics. It can attenuate the 1st to 7th harmonics. Moreover, it has low insertion losses and low group delays at both channels while the isolation and return losses are acceptable. Finally, the proposed diplexer is fabricated and measured to verify the simulation results, where a good agreement between the simulation and measurement results is obtained.

Hexagonal Nested Loop Fractal Antenna for Quad Band Wireless Applications

Frequenz ◽  
2019 ◽  
Vol 73 (3-4) ◽  
pp. 99-108
Author(s):  
Robert Mark ◽  
Nipun Mishra ◽  
Kaushik Mandal ◽  
Partha Pratim Sarkar ◽  
Soma Das
Keyword(s):  
Reflection Coefficient ◽  
Low Cost ◽  
Impedance Matching ◽  
Ground Plane ◽  
Fractal Antenna ◽  
Wireless Applications ◽  
Resonant Modes ◽  
Simulation Results ◽  
Nested Loop ◽  
Good Agreement

Abstract A compact hexagonal nested loop fractal antenna with L shaped slot on the ground plane is presented for multiband applications. In this paper, the effect of fractal iterations and position of L-slot on ground plane are optimized for better performance of the antenna. Multiple hexagon loops excite multiple resonant modes at 1.7, 2.4, 3.1, 4.5 and 6 GHz and an L-shaped slot on the ground plane helps to achieve wide bandwidth response with better impedance matching in the 4.25–6.41 GHz frequency band. An equivalent circuit of the proposed antenna is modelled and the same is verified using ADS. Reflection coefficient and radiation pattern are presented to further confirm the performance of the proposed design for wireless applications. The proposed antenna is fabricated on a low-cost FR4 substrate of dimensions 40×32×1.6 mm3 and measured results show good agreement with simulation results.

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