scholarly journals Defective Microwave Photonic Crystals for Salinity Detection

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1243
Author(s):  
Yuxia Zhu ◽  
Hongwei Yang
Keyword(s):  
Photonic Crystals ◽  
Frequency Band ◽  
Saline Solution ◽  
Microwave Frequency ◽  
Microwave Band ◽  
Detection Range ◽  
Microwave Photonic ◽  
Microwave Dielectric ◽  
Lossy Medium ◽  
Solution Layer

In this paper, defective microwave photonic crystals (MPCs) are designed to sense the salinity of aqueous solutions. The defective MPC sensors are constructed by two kinds of microwave dielectric layers and one defective salt solution layer. Transfer matrix method (TMM) for lossy medium is developed to calculate the transmittance spectra of the sensors. It is found that the peak transmittance of both the defective resonance within the microwave band gap (MBG) and transmitting modes outside the MBG monotonously decrease with the increase of salinity, while the resonant and transmitting mode frequencies remain unchanged. By comparing the four MPC sensor structures, the first transmitting mode in the upper frequency band outside the MBG of the 15-layer MPC sensor has the largest salinity sensing range from 0 to 40‰ with relative stable detecting sensitivity. The sensing principle is based on the fact that the dielectric loss factor of saline solution is much more sensitive to salinity than the dielectric constant in the microwave frequency band. The sensitivity, quality factor, and salinity detection range of the MPC sensors are calculated and compared. The reported defective MPC sensors are suitable to be used for non-contact salinity detection.

scholarly journals Shared-Aperture 24–28 GHz Waveguide Antenna Array

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2976
Author(s):  
Pavel Hazdra ◽  
Jan Kracek ◽  
Tomas Lonsky ◽  
Vaclav Kabourek ◽  
Zdenek Hradecky
Keyword(s):  
Antenna Array ◽  
Frequency Band ◽  
Microwave Frequency ◽  
Proof Of Concept ◽  
Microwave Photonic ◽  
Telecommunication Systems ◽  
The Individual

A compact three-element shared-aperture waveguide antenna array for the 24–28 GHz microwave-frequency band is presented as a proof-of-concept of an array with steerable directional beam suitable for 5G telecommunication systems. The array is intended for use in a microwave photonic link and is sufficiently steerable only with the progressively phased excitation signals of equal magnitudes. The mutual interactions between the array elements are minimized to maintain the properties of the individual elements, even if they are embedded and closely spaced in the array. The proposed concept could be simply extended by adding more elements to further increase the directivity and enhance the steering properties of the array.

scholarly journals Design of a Microwave Power Detection System in the 5G-Communication Frequency Band

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2674
Author(s):  
Qingying Ren ◽  
Wen Zuo ◽  
Jie Xu ◽  
Leisheng Jin ◽  
Wei Li ◽  
...  
Keyword(s):  
Frequency Band ◽  
Microwave Power ◽  
Communication Systems ◽  
Detection System ◽  
Measurement Sensitivity ◽  
Detection Range ◽  
Detection Systems ◽  
Detection Frequency ◽  
Communication Frequency ◽  
5G Communication

At present, the proposed microwave power detection systems cannot provide a high dynamic detection range and measurement sensitivity at the same time. Additionally, the frequency band of these detection systems cannot cover the 5G-communication frequency band. In this work, a novel microwave power detection system is proposed to measure the power of the 5G-communication frequency band. The detection system is composed of a signal receiving module, a power detection module and a data processing module. Experiments show that the detection frequency band of this system ranges from 1.4 GHz to 5.3 GHz, the dynamic measurement range is 70 dB, the minimum detection power is −68 dBm, and the sensitivity is 22.3 mV/dBm. Compared with other detection systems, the performance of this detection system in the 5G-communication frequency band is significantly improved. Therefore, this microwave power detection system has certain reference significance and application value in the microwave signal detection of 5G communication systems.

Microwave Photonic Crystals for Electro-Optic Quantum Transduction

2021 ◽  
Author(s):  
M. Khanna ◽  
Y. Hu ◽  
C. Ligato ◽  
T. P. Purdy
Keyword(s):  
Photonic Crystals ◽  
Microwave Photonic ◽  
Electro Optic

Applications of microwave photonic crystals

2019 ◽  
pp. 86-141 ◽  
Author(s):  
D. A. Usanov ◽  
S. A. Nikitov ◽  
A. V. Skripal’ ◽  
D. V. Ponomarev
Keyword(s):  
Photonic Crystals ◽  
Microwave Photonic

One-dimensional microwave photonic crystals based on rectangular waveguides

2019 ◽  
pp. 1-40
Author(s):  
D. A. Usanov ◽  
S. A. Nikitov ◽  
A. V. Skripal’ ◽  
D. V. Ponomarev
Keyword(s):  
Photonic Crystals ◽  
One Dimensional ◽  
Microwave Photonic ◽  
Rectangular Waveguides

PHOTONIC CRYSTALS | Microwave Photonic Crystals

2005 ◽  
pp. 128-139
Author(s):  
D.F. Sievenpiper
Keyword(s):  
Photonic Crystals ◽  
Microwave Photonic

scholarly journals Multi-Addressed Fiber Bragg Structures for Microwave-Photonic Sensor Systems

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2693 ◽  
Author(s):  
Oleg Morozov ◽  
Airat Sakhabutdinov ◽  
Vladimir Anfinogentov ◽  
Rinat Misbakhov ◽  
Artem Kuznetsov ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Microwave Frequency ◽  
Optical Signal ◽  
Electrical Signal ◽  
Infrared Range ◽  
Electromagnetic Spectrum ◽  
Sensor Systems ◽  
Central Frequency ◽  
Bragg Structure ◽  
Microwave Photonic

The new theory and technique of Multi-Addressed Fiber Bragg Structure (MAFBS) usage in Microwave Photonics Sensor Systems (MPSS) is presented. This theory is the logical evolution of the theory of Addressed Fiber Bragg Structure (AFBS) usage as sensors in MPSS. The mathematical model of additive response from a single MAFBS is presented. The MAFBS is a special type of Fiber Bragg Gratings (FBG), the reflection spectrum of which has three (or more) narrow notches. The frequencies of narrow notches are located in the infrared range of electromagnetic spectrum, while differences between them are located in the microwave frequency range. All cross-differences between optical frequencies of single MAFBS are called the address frequencies set. When the additive optical response from a single MAFBS, passed through an optic filter with an oblique amplitude–frequency characteristic, is received on a photodetector, the complex electrical signal, which consists of all cross-frequency beatings of all optical frequencies, which are included in this optical signal, is taken at its output. This complex electrical signal at the photodetector’s output contains enough information to determine the central frequency shift of the MAFBS. The method of address frequencies analysis with the microwave-photonic measuring conversion method, which allows us to define the central frequency shift of a single MAFBS, is discussed in the work.

Sign in / Sign up

Export Citation Format

Share Document