scholarly journals Ultra-compact capacitively loaded evanescent half-mode SIW filters for LTE applications

2014 ◽  
Vol 6 (5) ◽  
pp. 487-490 ◽  
Author(s):  
Tinus Stander ◽  
Saurabh Sinha
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Center Frequency ◽  
Fractional Bandwidth ◽  
Third Order ◽  
Printed Circuit ◽  
Term Evolution ◽  
Waveguide Filter ◽  
Capacitive Loading

This paper presents a novel miniaturized substrate integrated waveguide filter by combining both half-mode resonators and capacitive loading on a conventional two-layer printed circuit board (PCB) process. The resulting synthesis is successfully demonstrated in an long-term evolution application by means of a third-order filter of <225 mm2in size while featuring 2.3 dB insertion loss over a 5.5% fractional bandwidth at 3.7 GHz. Good first-iteration agreement between simulated and measured results, both in center frequency and bandwidth, are achieved.

scholarly journals A New Ultracompact Narrow Bandpass Microstrip Filter Using Double-Negative Quasiplanar Cells

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Mohammad Reza Khawary ◽  
Vahid Nayyeri ◽  
Seyed Mohammad Hashemi ◽  
Mohammad Soleimani
Keyword(s):  
Printed Circuit Board ◽  
High Selectivity ◽  
Bandpass Filter ◽  
Circuit Board ◽  
Center Frequency ◽  
Double Negative ◽  
Fractional Bandwidth ◽  
Printed Circuit ◽  
Full Wave ◽  
Good Agreement

This paper presents a novel ultracompact narrow bandpass filter with high selectivity. The proposed filter is composed of cascading two basic cells. Each cell is basically a microstrip line loaded with a quasiplanar resonator and series gaps which can be fabricated using a standard multilayer printed circuit board technology. The structure is analyzed through an equivalent circuit and full-wave simulations. The simulation results are compared with experimental measurements demonstrating a good agreement between them. The measurement indicates that the realized bandpass filter at the center frequency of 1 GHz has a fractional bandwidth of 2.2%. Most importantly, in comparison with other similar recent works, it is shown that the proposed filter has the smallest size.

scholarly journals ARREGLO DE ANTENAS CON BAJO ACOPLAMIENTO MUTUO PARA SISTEMAS DE COMUNICACIONES INALÁMBRICAS MIMO-LTE

2017 ◽  
Vol 1 (27) ◽  
Author(s):  
Eduardo Rodríguez Araque ◽  
Roberto G. Rojas-Teran
Keyword(s):  
Printed Circuit Board ◽  
Multiple Input Multiple Output ◽  
Long Term Evolution ◽  
Circuit Board ◽  
Printed Circuit ◽  
Term Evolution ◽  
Multiple Input ◽  
Input Multiple Output

Este trabajo trata de un arreglo de antenas MIMO (multiple-input-multiple-output) que opera en la banda de 2.6 GHz, una banda de Long Term Evolution (LTE), para sistemas de comunicaciones móviles inalámbricas 4G. El arreglo de antenas consiste de 4 antenas compactas tipo patch sobre un substrato dieléctrico (PCB) de 125 mm x 62.5 mm x 1.27 mm. Modificaciones del plano de tierra (GND) junto con la ubicación sistemática y orientación de cada antena en la cara posterior al plano de tierra del PCB (Printed Circuit Board) juegan un rol muy importante en la reducción sustancial del acoplamiento mutuo, esto generalmente afecta el desempeño de los arreglos MIMO.Palabras clave: Arreglo de antenas, modos característicos, correlación espacial, multiple-input-multiple-output (MIMO), acoplamiento mutuo.

scholarly journals Evaluation of printed-circuit boards materials for high temperature operation

2017 ◽  
Vol 2017 (HiTEN) ◽  
pp. 000057-000062
Author(s):  
Oriol Aviño-Salvado ◽  
Wissam Sabbah ◽  
Cyril Buttay ◽  
Hervé Morel ◽  
Pascal Bevilacqua
Keyword(s):  
High Temperature ◽  
Printed Circuit Boards ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Physical Measurements ◽  
Epoxy Material ◽  
High Temperature Operation

ABSTRACT This article presents the long term (1000 h) behaviour of two printed-circuit board materials (Panasonic R1755V, a high-TG glass-epoxy composite and Arlon 85N, a polyimide-based laminate) stored at high temperature (190 °C). Tests are performed in air and in nitrogen atmospheres. Electrical and physical measurements are performed regularly (once per week). Almost no degradation is observed for both materials, when stored in nitrogen. On the contrary, the board stored in air show the consequences of ageing. This is especially true for the glass-epoxy material, which becomes unusable after 2 weeks, because of large swelling.

scholarly journals A New Reconfigurable Filter Based on a Single Electromagnetic Bandgap Honey Comb Geometry Cell

Electronics ◽  
2021 ◽  
Vol 10 (19) ◽  
pp. 2390
Author(s):  
Andre Tavora de Albuquerque Silva ◽  
Claudio Ferreira Dias ◽  
Eduardo Rodrigues de Lima ◽  
Gustavo Fraidenraich ◽  
Larissa Medeiros de Almeida
Keyword(s):  
Communication Systems ◽  
Printed Circuit Board ◽  
Unit Cell ◽  
Circuit Board ◽  
Center Frequency ◽  
Electromagnetic Bandgap ◽  
Printed Circuit ◽  
Varactor Diodes ◽  
Intelligent Communication ◽  
Rejection Band

This work presents a new unit cell electromagnetic bandgap (EBG) design based on HoneyComb geometry (HCPBG). The new HCPBG takes a uniplanar geometry (UCPBG—uniplanar compact PBG) as a reference and follows similar design methods for defining geometric parameters. The new structure’s advantages consist of reduced occupied printed circuit board area and flexible rejection band properties. In addition, rotation and slight geometry modification in the HCPBG cell allow changing the profile of the attenuation frequency range. This paper also presents a reconfigurable unit cell HCPBG filter strategy, for which the resonance center frequency is shifted by changing the gap capacitance with the assistance of varactor diodes. The HCPBG filter and reconfiguration behavior is demonstrated through electromagnetic (EM) simulations over the FR1 band of the 5G communication network. Intelligent communication systems can use the reconfiguration feature to select the optimal operating frequency for maximum attenuation of unwanted or interfering signals, such as harmonics or intermodulation products.

scholarly journals Evaluation of Printed-Circuit Board Materials for High-Temperature Operation

2017 ◽  
Vol 14 (4) ◽  
pp. 166-171
Author(s):  
Oriol Aviño-Salvado ◽  
Wissam Sabbah ◽  
Cyril Buttay ◽  
Hervé Morel ◽  
Pascal Bevilacqua
Keyword(s):  
High Temperature ◽  
Printed Circuit Board ◽  
Epoxy Composite ◽  
Circuit Board ◽  
Printed Circuit ◽  
Physical Measurements ◽  
Epoxy Material ◽  
High Temperature Operation

This article presents the long-term (1,000 h) behavior of two printed-circuit board materials (Panasonic R1755V, a high-TG glass-epoxy composite and Arlon 85N, a polyimide-based laminate) stored at high temperature (190°C). Tests are performed in air and in nitrogen atmospheres. Electrical and physical measurements are performed regularly (once per week). Almost no degradation is observed for both materials when stored in nitrogen. On the contrary, the board stored in air shows the consequences of ageing. This is especially true for the glass-epoxy material, which becomes unusable after 2 w, because of large swelling.

scholarly journals Electrically Switchable Semiloop Antenna with Polarization and Pattern Diversity

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 708
Author(s):  
Yu-Jen Chi ◽  
Chien-Fang Su ◽  
Ching-Lieh Li
Keyword(s):  
Printed Circuit Board ◽  
Metal Layer ◽  
Coplanar Waveguide ◽  
Operating Mode ◽  
Circular Ring ◽  
Circuit Board ◽  
Center Frequency ◽  
Strip Line ◽  
Horizontal Polarization ◽  
Printed Circuit

This paper proposes a coplanar waveguide (CPW)-fed semiloop antenna with switchable linear polarization and radiation pattern. This design uses a novel asymmetric coplanar strip line (ACPS) circular ring to produce even or odd modes of the CPW, which can generate vertical or horizontal polarization in the semiloop antenna. The modes of the ACPS circular ring can be switched by controlling the on/off state of the PIN diode, and only a two-bit control signal is required to select the operating mode. The proposed polarization switchable antenna uses only one metal layer of the printed circuit board. The center frequency of the dual-polarization antenna was determined to be 2.45 GHz, and the −10 dB impedance bandwidths were determined to be 12.86% and 4.92% for vertical and horizontal polarization, respectively. The antenna parameters, such as the return loss, gain, and radiation patterns, are also presented for validating the proposed design.

Long-term stability of resistors embedded in printed circuit board

2011 ◽  
Author(s):  
Damian Nowak ◽  
Pawel Winiarski ◽  
Adam Klossowicz ◽  
Andrzej Dziedzic ◽  
Wojciech Steplewski ◽  
...  
Keyword(s):  
Printed Circuit Board ◽  
Circuit Board ◽  
Printed Circuit ◽  
Term Stability ◽  
Long Term Stability
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