High-Q helical resonator for oscillators and filters in mobile communications systems

Everard, J.K.A.; Cheng, K.-K.M.; Dallas, P.A.

doi:10.1049/el:19891105

Cited by 17 publications

(3 citation statements)

References 1 publication

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“…On the other hand, the helical resonator has a narrow bandwidth so as to filter out the power in unwanted applied frequencies, thereby reducing their contribution to motional heating of ions. [29] Apart from the application in the RF trap, the helical resonator is also widely used in different kinds of experiments, such as for the non-destructive resonant detection of eigen-frequencies of charged particles confined in a Penning trap, [30,31] measuring the dielectric property of materials, [32] designing high frequency filter in the communication systems, [33] and applying an intense electric field for ultrasound generation. [34] Up to now, there is still no experiment achieved a contin-uous change of the resonant frequency of the helical resonator in a large range and high adjusting accuracy.…”

Section: Introductionmentioning

confidence: 99%

New designed helical resonator to improve measurement accuracy of magic radio frequency

Guo¹,

Liu²,

Lee³

2022

Chinese Phys. B

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Based upon the new designed helical resonator, the RF resonant frequency for trapping ions can be consecutively adjusted in a large range (about 12 MHz to 29 MHz) with high Q-factors (above 300). We analyze the helical resonator with a lumped element circuit model and find that the theoretical results fit well with experiment data. With our resonator system, the resonant frequency near magic RF frequency (where the scalar Stark shift and the second-order Doppler shift due to excess micromotion cancel each other) can be continuously changed at kHz level. For 88Sr+ ion, compared to earlier results, the measurement accuracy of magic RF frequency can be improved by an order of magnitude upon rough calculation, and therefore the net micromotion frequency shifts can be further reduced. Also, the differential static scalar polarizability △α 0 of clock transition can be experimentally measured more accurately.

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Section: Introductionmentioning

confidence: 99%

New designed helical resonator to improve measurement accuracy of magic radio frequency

Guo¹,

Liu²,

Lee³

2022

Chinese Phys. B

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“…Plasma generation [3][4][5][6]; • Ion trap antennas [7]; • Self-capacitance of coils [8,9]; • RF filters [10,11]; • Tesla coil construction [12]; • Precision measurements and metamaterial research [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

The Helical Resonator: A Scheme for Radio Frequency Plasma Generation

Martines¹,

Cavazzana²,

Cordaro³

et al. 2021

Applied Sciences

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The helical resonator is a scheme for the production of high voltage at radio frequency, useful for gas breakdown and plasma sustainment, which, through a proper design, enables avoiding the use of a matching network. In this work, we consider the treatment of the helical resonator, including a grounded shield, as a transmission line with a shorted end and an open one, the latter possibly connected to a capacitive load. The input voltage is applied to a tap point located near the shorted end. After deriving an expression for the velocity factor of the perturbations propagating along the line, and in the special case of the shield at infinity also of the characteristic impedance, we calculate the input impedance and the voltage amplification factor of the resonator as a function of the wave number. Focusing on the resonance condition, which maximizes the voltage amplification, we then discuss the effect of the tap point position, dissipation and the optional capacitive load, in terms of resonator performance and matching to the power supply.

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“…However, this approach reduces the power handling capability and degrades the quality factor of the resonator. Halfwavelength helical resonators have been utilized to construct oscillators [9], however it has rarely been used for filters. Additionally, here the helix is designed to have variable width.…”

Section: Introductionmentioning

confidence: 99%

3-D printed filter based on helical resonators with variable width

Shang

Guo

et al. 2017

2017 IEEE MTT-S International Microwave Symposium (IMS)

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This paper presents a helical resonator bandpass filter produced using a stereolighography (SLA) based 3-D printing technique. The filter is formed of four coupled helical resonators, and for each resonator the helix is fixed at both ends so that the resonator is less prone to vibration. The helix is designed to have variable width and this yields enhanced performance in terms of a higher unloaded quality factor and a spurious resonance at higher frequencies. Such a helix is ideally suited to 3-D printing which allows easy production of complex structures. The whole filter is printed from a resin, then plated with metal, and tested.The measured result has a good agreement with simulations.

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High-Q helical resonator for oscillators and filters in mobile communications systems

Cited by 17 publications

References 1 publication

New designed helical resonator to improve measurement accuracy of magic radio frequency

New designed helical resonator to improve measurement accuracy of magic radio frequency

The Helical Resonator: A Scheme for Radio Frequency Plasma Generation

3-D printed filter based on helical resonators with variable width

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