Parallel Plate Mode Suppression in Low-Frequency Microwave Circuit Packages Using Lid of 3-D Cross by a 3-D Printing Technique

2017 ◽  
Vol 59 (4) ◽  
pp. 1268-1271 ◽  
Author(s):  
Yongrong Shi ◽  
Ming Zhou ◽  
Junzhi Zhang
Keyword(s):  
Parallel Plate ◽  
Low Frequency ◽  
Microwave Circuit ◽  
Mode Suppression ◽  
Printing Technique

scholarly journals Radiation Efficient Unidirectional Low-Profile Slot Antenna Elements for X-Band Application

2005 ◽  
Vol 3 ◽  
pp. 143-146
Author(s):  
C. Löcker ◽  
T. Vaupel ◽  
T. F. Eibert
Keyword(s):  
Parallel Plate ◽  
Radiation Efficiency ◽  
Slot Antenna ◽  
Coupling Coefficients ◽  
Rectangular Slot ◽  
Mode Suppression ◽  
Low Profile ◽  
Shorting Pin ◽  
Strong Excitation ◽  
Back Reflector

Abstract. Slots in metallic ground planes are very promising candidates for conformal antenna applications. However, a low-profile unidirectional antenna requires a back reflector close to the slot and the resulting stripline feed causes strong excitation of parallel-plate modes. In this contribution, we consider unidirectional reflector-backed slot configurations with parallel-plate mode suppression by shorting pins. Starting from a parametric study with respect to shorting pin location and back reflector distance, we present a stripline-fed rectangular slot element with radiation efficiency of more than 80% and a bandwidth of about 5% at centre frequency 10GHz. A careful optimisation of shorting pin locations guarantees reliable parallel-plate mode suppression without deteriorating the slot radiation behaviour. Coupling coefficients between parallel and aligned rectangular slot elements are presented. For increased bandwidth applications, a bow-tie slot element with about 8% bandwidth and radiation efficiency of close to 80% is proposed.

scholarly journals Understanding Dielectrics: Impact of External Salt Water Bath

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2033
Author(s):  
Jonathan Phillips ◽  
Alexander Roman
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Parallel Plate ◽  
Dielectric Material ◽  
Salt Water ◽  
Low Frequency ◽  
Ambient Air ◽  
Dielectric Materials ◽  
Standard Theory ◽  
Parallel Plate Capacitor

As predicted by the theory of super dielectric materials, simple tests demonstrate that dielectric material on the outside of a parallel plate capacitor dramatically increases capacitance, energy density, and power density. Simple parallel plate capacitors with only ambient air between the plates behaved as per standard theory. Once the same capacitor was partially submerged in deionized water (DI), or DI with low dissolved NaCl concentrations, still with only ambient air between the electrodes, the capacitance, energy density, and power density, at low frequency, increased by more than seven orders of magnitude. Notably, conventional theory precludes the possibility that material outside the volume between the plates will in any fashion impact capacitive behavior.

Integrated (Ba,Sr)TiO3 Thin-Film Technology for RF and Microwave Applications

2008 ◽  
Vol 1075 ◽  
Author(s):  
Toshimasa Suzuki ◽  
Daiki Ishii ◽  
Yoshiki Iwazaki ◽  
Kentaro Morito ◽  
Youichi Mizuno
Keyword(s):  
Dielectric Loss ◽  
Parallel Plate ◽  
Phase Shifter ◽  
Low Frequency ◽  
Bias Field ◽  
Film Stress ◽  
Phased Array Antenna ◽  
Sputtering Deposition ◽  
Barium Concentration ◽  
Material Optimization

ABSTRACTThe microwave tunable capability and its related material optimization of (Ba,Sr)TiO3 thin films in the parallel-plate capacitor form is discussed in terms of the dependence of barium concentration, acceptor doping, and in-plane film stress, based on the present broadband microwave characterization technique under various bias fields. The barium-content dependence indicates the tradeoff between tunability and dielectric loss, and the notable field-induced loss in SrTiO3 is confirmed as an intrinsic quasi-Debye contribution. The Mg dopant incorporated into a perovskite lattice shows almost no effectiveness on tunable device performance, except for enhanced insulation as an electron acceptor, while the low bias-field dependence of the dielectric loss suggests the possibility of the partial occupation of the alkaline-earth-ion site by Mg. The reduction of in-plane thermal stress controlled by the pressure during sputtering deposition leads to higher permittivity and tunability while degrading the film crystallinity by ion bombardment. The low-frequency loss tends to increase with crystal damage; however, the microwave loss remains unchanged, revealing the applicability of sputtering stress control to real microwave devices. In addition, we demonstrate the operation of an analog phase shifter using parallel-plate ferroelectric tunable capacitors and its application to a phased array antenna monolithically integrated on a silicon substrate.

Structure of Low-Frequency Helium Glow Discharge at Atmospheric Pressure between Parallel Plate Dielectric Electrodes

1999 ◽  
Vol 38 (Part 1, No. 9A) ◽  
pp. 5244-5250 ◽  
Author(s):  
Fumiyoshi Tochikubo ◽  
Takuma Chiba ◽  
Tsuneo Watanabe
Keyword(s):  
Glow Discharge ◽  
Atmospheric Pressure ◽  
Parallel Plate ◽  
Low Frequency
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