• No results found

quadrifilar helical antennas

On the Precise Examination of Multi-Port Antennas; Corrections and Criticisms to Some Recently Reported Results

On the Precise Examination of Multi-Port Antennas; Corrections and Criticisms to Some Recently Reported Results

... These antennas usually have multiple ports with the same angular and phase differences between ...these antennas. In fact, the original antennas such as quadrifilar helical ...

10

A Broadband Printed Quadrifilar Helical Antenna with a Novel Compact Broadband Feeding Network

A Broadband Printed Quadrifilar Helical Antenna with a Novel Compact Broadband Feeding Network

... As their performances in terms of circular polarization, superior axial ratio over a wide beamwidth, and low cost, the printed quadrifilar helical antennas (PQHAs) have recently become a very ...

7

Miniature Folded Printed Quadrifilar Helical Antenna with Integrated Compact Feeding Network

Miniature Folded Printed Quadrifilar Helical Antenna with Integrated Compact Feeding Network

... printed quadrifilar helical antennas (FPQHA) have become an attractive choice owing to their performances of low profile, circular polarization, good axial ratio, and wide ...

6

A Folded Printed Quadrifilar Helical Antenna Employing a Compact Feeding Network

A Folded Printed Quadrifilar Helical Antenna Employing a Compact Feeding Network

... The advantages of the hemispherical radiation pattern of the printed quadrifilar helical antennas (PQHA) are very attractive for satellite communications. However, in order to resonate at the require ...

5

Mechanism of field induced unwinding of SmC* helix and biasfield dependencies of dielectric permittivity and effective polarization

Mechanism of field induced unwinding of SmC* helix and biasfield dependencies of dielectric permittivity and effective polarization

... the helical fractures appear and ...the helical fractures shown for a homeotropic cell, π walls always are accompanied by discrete c directors, that is, helical ...

6

Phased arrays: A strategy to lower the energy threshold for neutrinos

Phased arrays: A strategy to lower the energy threshold for neutrinos

... the antennas were carried along 100-m lengths of coax- ial Times Microwave LMR-240 along with DC power for the dual stage amplifier chains described in Section 2 mounted between the antennas in the ...

6

Numerical Investigations of Ultra Wideband Stacked Rectangular DRA Excited by Rectangular Patch

Numerical Investigations of Ultra Wideband Stacked Rectangular DRA Excited by Rectangular Patch

... resonator antennas (DRAs) have become attractive to antenna engineers due to its several beneficial features, such as its small size, light weight, low loss, high radiation efficiency, and easy of ...

13

Commensurability effects in holographic homogeneous lattices.

Commensurability effects in holographic homogeneous lattices.

... the helical background, since in this case the geometry explicitly depends on the spatial coordinates in a periodic ...the helical source which gives rise to the geometry, hence it is reasonable to expect a ...

23

Wave Propagation in a Helical Waveguide with Slab and Rectangular Dielectric Profiles, and Applications

Wave Propagation in a Helical Waveguide with Slab and Rectangular Dielectric Profiles, and Applications

... a helical waveguide with slab and rectangular dielectric profiles in the rectangular cross ...the helical waveguide. This method was developed for a helical waveguide (a space curved waveguide for an ...

26

Investigation of helical flow by using tracer technique

Investigation of helical flow by using tracer technique

... the helical pipe [8]. In order to obtain a clear image of the helical pipe, the applied voltage and current to the X- ray tube were selected as 270 kV and 99 mA, ...the helical pipe is shown in ...

5

The Effect Of Helical Size On Uplift Pile Capacity

The Effect Of Helical Size On Uplift Pile Capacity

... of helical piles behavior and performance are needed to be ...about helical pile was carried out both experimental test and numerical ...the helical pile pile compared to the non – helical ...

6

The Experimental Study on Uplift Bearing Capacity of Helical Piles in Silt Deposits

The Experimental Study on Uplift Bearing Capacity of Helical Piles in Silt Deposits

... ABSTRACT: Helical piles foundation systems have been extensively used in engineering ...application. Helical pile foundation system are commonly adapted to resists the compression, uplift force, overturning ...

7

Design and Analysis of High Speed Helical Gear with Different Helical Angles

Design and Analysis of High Speed Helical Gear with Different Helical Angles

... one helical gear with calculations in CAD tool Creo- 2/Pro-E which is having helical angle 20 degrees and face width 32mm and pressure angle 20, by using CAE tool ANSYS WORKBENCH we applying high rotational ...

6

Download
			
			
				Download PDF

Download Download PDF

... The study shows that the design of screw conveyors requires a detailed consideration of the geometry of the screw and the properties of the bulk material. The performance of screw conveyors has been based on experimental ...

7

Volume 3, Issue 3, March 2014 Page 313

Volume 3, Issue 3, March 2014 Page 313

... a helical spring is loaded by the axial force F, deflection is also exerted in ...a helical spring, we shall consider an element of wire formed by two adjacent cross ...

5

Helical Polyguanidines: Influences and Consequences of a Biased Helix

Helical Polyguanidines: Influences and Consequences of a Biased Helix

... biased helical conformation in the resulting ...preferred helical sense, over time the polymer backbone will racemize into a mixture of left- and right-handed helical regions of equivalent ...

158

Modelling and analyses of helical milling process

Modelling and analyses of helical milling process

... In helical milling process, strong interaction will happen between tool and workpiece ...and helical milling specialized tool are shown in ...the helical milling specialized tool is composed of two ...

38

Finite element model of a double-stage helical gear reduction.

Finite element model of a double-stage helical gear reduction.

... There are two possible sources of excitation in any gearbox system[22]. First, there is a so-called external excitation. R otating mass unbalance, geometric eccentricities, and prime mover or load torque fluctuations all ...

117

SMA HELICAL

SMA HELICAL

... composite helical spring ...composite helical spring actuators, which employs the sequential method combining the magnetic analysis by the commercial code ANSYS/Emag with the superelastic, large deformation ...

5

Miniaturization of Compact Quadrifilar Helix Antennas for Telemetry, Tracking and Command Applications

Miniaturization of Compact Quadrifilar Helix Antennas for Telemetry, Tracking and Command Applications

... Taking into account the dielectric supporting structure in the simulation model, the computational time increases significantly. For instance, the air-supported CQHA (i.e., without the cylindrical dielectric supporting ...

12

Show all 2179 documents...

Related subjects