Method for Measuring the Q-Factor of Miniature Open Dielectric Resonators at Microwave Frequencies

2021 ◽  
Author(s):  
V. M. Gevorkyan ◽  
Yu. A. Kazantsev ◽  
A. V. Shutov
Keyword(s):  
Dielectric Resonators ◽  
Q Factor ◽  
Microwave Frequencies

Q-FACTOR AND EXCITATION EFFICIENCY OF LAMINAR QUASI-OPTICAL DIELECTRIC RESONATORS

2014 ◽  
Vol 73 (1) ◽  
pp. 73-81 ◽  
Author(s):  
A. Ya. Kirichenko ◽  
G. V. Golubnichaya ◽  
I. G. Maximchuk ◽  
V. B. Yurchenko
Keyword(s):  
Dielectric Resonators ◽  
Q Factor ◽  
Excitation Efficiency ◽  
Optical Dielectric

Dielectric-loaded L-band filters for high-power space applications

2021 ◽  
pp. 1-11
Author(s):  
Paolo Vallerotonda ◽  
Fabrizio Cacciamani ◽  
Luca Pelliccia ◽  
Alessandro Cazzorla ◽  
Davide Tiradossi ◽  
...  
Keyword(s):  
High Power ◽  
Dielectric Resonators ◽  
Q Factor ◽  
Rf Power ◽  
Space Applications ◽  
High Q ◽  
Critical Issues ◽  
L Band ◽  
Multipactor Discharge ◽  
Filter Response

Abstract The design and first experimental results of Tx and Rx L-band bandpass filters for a high-power satellite diplexer are presented in this paper. Designed in the framework of an ESA ARTES AT project, the filters are based on TM010 mode dielectric resonators. These resonators allow for better results in terms of volume occupation with respect to other dielectric resonators still maintaining high Q-factor values (>2000). Volume saving above 30% is achieved with respect to standard coaxial filters. The filter geometries and materials have been chosen in order to improve the power-handling and to cope with related critical issues for space applications (i.e. avoid any multipactor discharge in the operating RF power range and low-PIM response). Measurements of Tx filter show good correlation with the design in terms of central frequency, BW, and unloaded Q-factor (almost 3000). Measurements of Rx filter show a worse correlation with the design in terms of filter response shape. This is ascribed to size tolerances of one of the filter resonators. Multiple analyses are ongoing to remove this degradation in the final engineering model.

Ceramic Materials for High-Quality Dielectric Resonators of Microwave Range

1992 ◽  
Vol 269 ◽  
Author(s):  
Yelizaveta A. Nenasheva
Keyword(s):  
Alkaline Earth ◽  
Ceramic Materials ◽  
Calcium Titanate ◽  
Dielectric Resonators ◽  
Microwave Range ◽  
Q Factor ◽  
High Quality ◽  
Lanthanum Aluminate ◽  
Alkaline Earth Elements ◽  
Frequency Temperature

ABSTRACTThe dielectric properties of ceramic materials and dielectric resonators on the basis of oxides of Ba,Ti and alkaline earth elements, and also of the calcium titanate-lanthanum aluminate system, with ε =82 and ε =40…48, frequency temperature coefficient (TCf) from - 10ppm/°C to + 10ppm/°C have been studied. Ceramics with ε =82 ensures the DR Q-factor of 3000 and more at f=3GHz. The Q-factor of DR made of ceramics with ε=42, TCf =0 reaches 8000 at f=7GHz.

Increasing the Q-factor of thin planar dielectric resonator with whispering gallery modes

2020 ◽  
Vol 12 (10) ◽  
pp. 960-968
Author(s):  
A. E. Kogut ◽  
M. T. Islam ◽  
E. A. Kogut ◽  
Z. E. Eremenko ◽  
R. S. Dolia
Keyword(s):  
Dielectric Resonator ◽  
Dielectric Waveguide ◽  
Air Gap ◽  
Whispering Gallery Modes ◽  
Dielectric Resonators ◽  
Q Factor ◽  
Energy Characteristics ◽  
Excitation Efficiency ◽  
Whispering Gallery ◽  
Dielectric Disk

AbstractThe spectral and energy characteristics of the tunable thin planar dielectric resonator with the movable metal mirror are researched. It is found that the high-Q HE-polarized whispering gallery modes (WGMs) are effectively excited in such a resonator by the dielectric waveguide. A mode set of the tunable thin planar dielectric resonator depends on the presence of an air gap in its design. Changing the height of the air gap affects the energy characteristics of the tunable thin planar dielectric resonators (DR). Shifting the resonant fields of WGMs from the dielectric disk to the air gap is the reason for this effect. It is shown that at certain heights of the air gap, increasing the unloaded Q-factor of the tunable thin planar DR and improving the excitation efficiency of WGMs in it is achieved.

Extraction of the Q factor of dielectric resonators from S-parameters using the cauchy method

2015 ◽  
Author(s):  
Dajun Lei ◽  
Feng Qiu ◽  
Hui Dong ◽  
Zhenghua Tang ◽  
Jianquan Huang ◽  
...  
Keyword(s):  
Dielectric Resonators ◽  
Q Factor ◽  
S Parameters ◽  
Cauchy Method

Effect of Divalent Dopants on Properties of Ba3.75Nd9.5Ti18O54 Microwave Dielectric Resonators

1996 ◽  
Vol 453 ◽  
Author(s):  
R. Ubic ◽  
I. M. Reaney ◽  
W. E. Lee ◽  
J. Samuels ◽  
E. Evangelinost
Keyword(s):  
Solid Solution ◽  
Dielectric Properties ◽  
Mixed Oxide ◽  
Theoretical Density ◽  
Dielectric Resonators ◽  
Ternary Solid Solution ◽  
Microwave Frequencies ◽  
Microwave Dielectric ◽  
Commercial Applications ◽  
Pb Substitution

AbstractPellets in the ternary solid-solution Ba6–3xNd8+2xTi18O54 (x=0.75) have been processed to near theoretical density by mixed-oxide synthesis, and their dielectric properties determined to be εr≈89, Qf> 10,000, and τf≈+60ppm/°C at microwave frequencies. Similar ceramics with Ca, Sr, and Pb partially substituted for Ba were also processed and analysed. Both Ca and Sr were found to increase εr to 100–105 but significantly lower Qf and inflate τf. While Pb substitution also lowered Qf, it had no significant effect on εr and beneficially suppressed τf to values from -16 to +8ppm/°C, tunable with Pb content, strongly suggesting that these materials may be useful for commercial applications.

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