Size Reduction of a Low-Profile Spiral Antenna Using Inductive and Dielectric Loading

Kramer, B.A.; Chen, Chi‐Chih; Volakis, John L.

doi:10.1109/lawp.2007.914116

Cited by 59 publications

(25 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the matching circuit cannot include only shunt inductors; the latter would shortcircuit the implanted antenna and lower the input impedance of the implant, looking in from the electrodes port. At the interrogator side, a wideband spiral antenna is employed that operates from 0.6 GHz to 6 GHz [28] [29]. The low-profile property of the spiral antenna enhances its near field coupling with the implanted patch antenna.…”

Section: System Operationmentioning

confidence: 99%

“…It is a low-profile ultra wide-band slot spiral antenna. The diameter of the spiral is 145 mm, and operates from 0.6 GHz to 6 GHz [28] [29]. The low-profile property of this spiral antenna enhances its near field coupling with the implanted patch antenna, thus allowing for high transmission coefficient, |S21|, between the two.…”

Section: B Antennas 1) Antenna Designmentioning

confidence: 99%

See 1 more Smart Citation

A High-Sensitivity Fully Passive Neurosensing System for Wireless Brain Signal Monitoring

Lee

Kiourti

Chae

et al. 2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

Abstract-A high-sensitivity, fully-passive neurosensing system is presented for wireless brain signal monitoring. The proposed system is able to detect very low power brain-like signals, viz. as low as -82 dBm (50 μVpp) at fneuro > 1 kHz. It is also able to read emulated neural signals as low as -70 dBm (200 μVpp) at fneuro > 100 Hz. This is an improvement of up to 22 dB in sensitivity as compared to previously reported neural signals. The system is comprised of an implanted neurosensor and an exterior interrogator. The neurosensor receives an external carrier signal and mixes it with the neural signals prior to retransmitting to the interrogator. Of importance is that the implanted neurosensor is fully passive and does not require a battery nor rectifier/regulator, but is concurrently wireless for unobtrusive neurosensing with minimal impact to the individual's activity. To achieve this remarkable high sensitivity, the sensing system employed: (a) a sub-harmonic mixer using an anti-parallel diode pair (APDP), (b) a pair of implanted/interrogator antennas with high transmission coefficient, |S21|, and (c) a matching circuit between the implanted antenna and the mixer. This neurosensing system brings forward a new possibility of wireless neural signal detection using passive brain implants.Index Terms-Anti-parallel diode pair (APDP), brain implant, neurosensing, passive, wireless medical telemetry, sub-harmonic mixing.

show abstract

Section: System Operationmentioning

confidence: 99%

Section: B Antennas 1) Antenna Designmentioning

confidence: 99%

A High-Sensitivity Fully Passive Neurosensing System for Wireless Brain Signal Monitoring

Lee

Kiourti

Chae

et al. 2015

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…Such currents can form the strongest radiation on the spiral arms, when the diameter of the spiral arms is approximately equal to λ/π. That is to say, when the circumference is about one wavelength corresponding to the current frequency, it is the planar Archimedean spiral antenna's main radiation fields [1] . The spiral inner diameter 2r 0 affects the maximum operating frequency and the feeding performance, it is shown as follows:…”

Section: Introductionmentioning

confidence: 99%

A Study on a Miniaturized Planar Spiral Antenna for Partial Discharge Detection in GIS

Wang

et al. 2015

MATEC Web of Conferences

View full text Add to dashboard Cite

Ultra-high frequency (UHF) detection method can effectively detect the signals of partial discharge (PD) in electrical equipment. Hence the authors designed a sensor of miniaturized planar spiral antenna for detecting PD in gas insulated substations (GISs), which is sine-wave meandered based on the traditional Archimedean spiral antenna in order to reduce the antenna's size. The test results indicate that this antenna has a wide-frequency band of 0.92~3GHz in terms of the voltage standing wave ratio (VSWR) which is smaller than 2. The antenna is smaller and its structure is simpler, its diameter is 97mm and its height is 51mm Besides, this antenna has an ultra-wideband, great directivity and the feature of omnidirectional radiation. Therefore, the proposed antenna is quite promising for PD on-line detection applications.

show abstract

“…Spiral surrounded with a metallic ring is analyzed in [4]. A modified spiral arm, such as a zigzag and inductive loading, also achieves good radiation characteristics [5,6].…”

Section: Introductionmentioning

confidence: 99%

A New Spiral Antenna With Improved Axial Ratio and Shorted Arm Length

Huang¹,

Lv²

2014

PIER C

View full text Add to dashboard Cite

Abstract-A new spiral antenna is proposed in this paper. The developed antenna has improved axial ratio (AR) and shorted arm length. The formula of the new spiral is given. The developed spiral antenna combines the low frequency characteristic of power spiral antenna and high frequency characteristic of Archimedean spiral antenna. The growth rate of radial distance at large winding angle is close to power spiral for improved AR in low frequencies, and the growth rate at small winding angle is close to Archimedean spiral for good AR in high frequencies. The results reveal that the developed spiral antenna has noticeable improved axial ratio at low frequencies compared with Archimedean spiral antenna, and the problem of axial ratio degradation of power spiral antenna is also solved. The arm length is shorted by 46.4% compared to conventional Archimedean spiral antenna, and 63.5% compared to power spiral antenna.

show abstract

Size Reduction of a Low-Profile Spiral Antenna Using Inductive and Dielectric Loading

Cited by 59 publications

References 7 publications

A High-Sensitivity Fully Passive Neurosensing System for Wireless Brain Signal Monitoring

A High-Sensitivity Fully Passive Neurosensing System for Wireless Brain Signal Monitoring

A Study on a Miniaturized Planar Spiral Antenna for Partial Discharge Detection in GIS

A New Spiral Antenna With Improved Axial Ratio and Shorted Arm Length

Contact Info

Product

Resources

About