Optimization of the size and the shape of a wheeler cap for mobile phone-antenna efficiency measurements

This article presents a new reconfigurable DVB‐H antenna for a portable TV or a tablet PC device. The antenna consists in a folded monopole loaded by a diode varactor combined with an open stub used to match the antenna. Design procedure and equivalent model are presented. A prototype is realized and measured; return loss and efficiency are presented. A minimal total efficiency of 27% is reported at the whole DVB‐H band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26160

show abstract

“…The efficiency of the antenna was measured using Wheeler cap method [10]. A metallic box of 23 × 23 × 40 cm 3 was used to perform measurements.…”

Section: Prototype and Experimental Resultsmentioning

confidence: 99%

Frequency reconfigurable antenna for DVB‐H applications

Canneva¹,

Ferrero²,

Ribero³

et al. 2011

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…While the shape of the cap can be altered according to the antenna's type and shape [20], the cap dimensions have to respect two conditions: 1/cap radius greater than λ/2π, and 2/lowest cut-off frequency of the cavity modes greater than the antenna's resonant frequency. The WC designed for this work is rectangular, made of copper plates having dimensions of 220 * 220 * 150 mm 3 , with 150 mm being the caps height (Fig.…”

Section: Wc Dimensionsmentioning

confidence: 99%

Optimization of the Wheeler Cap Technique for Efficiency Measurement of Rfid Antennas Matched to Complex Loads

Rishani¹,

Laheurte²,

Protat³

et al. 2021

PIER Letters

View full text Add to dashboard Cite

This paper proposes an improved mathematical formulation of Johnston's approach to measure the radiation efficiency of an antenna, based on the Wheeler Cap (WC) technique. The proposed modifications allow the measurement of the radiation efficiency of small antennas matched to complex loads implemented on Radio Frequency IDentification (RFID) tags. The studied structure is a low-cost, silver-printed, differentially-fed RFID dipole antenna. The antenna is printed on a flexible PET (polyethylene terephthalate) paper that is conformable on various objects. Link budget measurements validate the accuracy of the formulation, which can be applied to any dipole antenna matched to an RFID chip with a complex input impedance.

show abstract

“…The dimension of the cap is greater than or equal to l/2 to all directions from the antenna. The cap cancels out far-field radiation by reflecting all electric field radiations from the The antenna radiation efficiency measurements by using Wheeler cap method verifications are shown in [23][24][25]. The Wheeler cap applications to the HFSS simulation are shown in [24,25].…”

Section: Radiation Efficiency Of Zigzag Antennamentioning

confidence: 99%

Flexible VHF Animal Collar Antenna for GPS-Aided Wildlife Tracking

Yoo¹,

Melde²

2014

Innovation in Wearable and Flexible Antennas

View full text Add to dashboard Cite

Wearable antennas are gaining increased importance in their use for wildlife tracking. It is important that such antennas be non-obtrusive and have minimal impact on typical animal activity. This chapter presents the design of a wearable zigzag antenna that can be integrated into animal collars. The antenna is designed to work at 153 MHz and supplies GPS location data over a ground link in forested regions. The design details emphasize how folding a monopole wire into a zigzag antenna, curving the zigzag, and placing it in close proximity to the animal body, and adding in a small transmission line section can create a compact antenna that is well matched to a 50 Ω feed line and can be integrated into animal tracking collars.

show abstract

Optimization of the size and the shape of a wheeler cap for mobile phone-antenna efficiency measurements

Cited by 7 publications

References 0 publications

Frequency reconfigurable antenna for DVB‐H applications

Frequency reconfigurable antenna for DVB‐H applications

Optimization of the Wheeler Cap Technique for Efficiency Measurement of Rfid Antennas Matched to Complex Loads

Flexible VHF Animal Collar Antenna for GPS-Aided Wildlife Tracking

Contact Info

Product

Resources

About