Electrically Small Frequency-Agile PIFA-as-a-Package for Portable Wireless Devices

In this letter, a wide‐tuning range planar inverted‐F antenna (PIFA) of 17 × 10 mm2 dimension printed on a Rogers duroid RT5880 substrate is presented. The printed circuit board (PCB) dimensions are 1 × 60 mm2. First, the antenna is simulated with a localized capacitor and the effect of the capacitor losses on the antenna efficiency is studied. Then, the antenna is simulated with an integrated BaSrTiO3 (BST) tunable capacitor. The obtained results are in very good agreement with those obtained with localized elements. Finally, the BST thin film capacitor is fabricated and mounted on the antenna. The experimental results show a capacitor tunability of 56.7% at a bias voltage of 35 V, leading to an antenna agility of 42.2%.

show abstract

“…In Ref. , a frequency reconfigurable ESA was designed. Eight switches were used to tune the antenna in the (407.8–463.1) MHz band.…”

Section: Introductionmentioning

confidence: 99%

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO₃ capacitor

Haskou

Sharaiha

Collardey

et al. 2018

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…These technologies have been employed successfully in various antenna designs, such as patch antennas [12][13][14][15][16], slot antennas [17,18], dielectric resonator antennas [19], dipole antennas [20], loop antennas [21], PIFAs [22], compact arrays [23], and different versions of electrically small antennas [24][25][26][27][28][29][30]. To the best of our knowledge, numerous efforts (e.g., [11]- [30]) have previously been focused on enlarging the effective impedance bandwidth of linearly polarized (LP) antennas.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements

Tang

Ziolkowski

2015

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

A frequency-agile, efficient, circularly polarized (CP), near-field resonant parasitic (NFRP) antenna is presented. It consists of two orthogonal capacitively-loaded loops (CLLs) with similar configurations placed vertically with respect to a finite ground disc and serve as the NFRP elements. They are placed in the near field of two monopoles fed from a single coax feedline. A pair of varactor diodes is incorporated into the NFRP elements to achieve its frequency agile behavior. The NFRP elements produce nearly complete matching at frequencies much lower than the fundamental modes of the monopoles without any matching circuit. Frequency tunability is demonstrated over a wide effective impedance bandwidth and the antenna is characterized as having good axial ratio (AR) and high radiation efficiency. A proof-of-concept experiment produced reasonable agreement with the simulation studies. The measured results demonstrate that the frequency-agile prototype produced a 3.92% fractional 3-dB AR bandwidth, which is more than four times larger than the 0.84% value of the original fixed-capacitor passive system. Moreover, good impedance matching (|S 11 | AR, min  -13 dB); relatively high radiation efficiency (RE > 85%); symmetrical, stable and uniform radiation patterns; CP performance; and peak gain values between 5.815.93 dB were measured over this frequency-agile range.

show abstract

“…Narrow band tunable antennas have the potential to exhibit higher efficiencies, lower return losses, and moreover smaller sizes than wideband coverage solutions. Micro electro‐mechanical system (MEMS) switches or PIN diode components can be used for example to modify the path of the currents on the metallic parts of the antenna and then the resonant frequency by changing the feed position [2], by commuting switches on slots [3] or by selecting different shorting strips between the antenna and the ground plane [4, 5]. Matching circuits can be also used to tune the antenna [6].…”

Section: Introductionmentioning

confidence: 99%

Small reconfigurable PIFA for DVB‐H applications

Canneva

Ferrero

Ribero

et al. 2011

Micro & Optical Tech Letters

View full text Add to dashboard Cite

contact between antenna-fed line, and the three point probes that cause parasitic impedance at the feeding point. CONCLUSIONThe CPW-fed circular slot antenna with a transverse short-circuiting stub for W-band operation has been designed and successfully implemented. The circular patch is chosen as central radiating element, and the annulus is selected as outer ground conductor. The outer annulus also acts as a main radiating element, but the resonant frequencies are different from those of the center patch. The proposed antenna has a simple structure and a size of 1.5 Â 1.8 Â 0.1 mm. A wide bandwidth has been achieved from 80 GHz-100 GHz by using a transverse short-circuiting stub that connects the circular patch to the outside annulus, and the gain is 3.05 dBi at 92 GHz with good radiation performance.ABSTRACT: This article presents a new miniature reconfigurable digital video broadcasting-handheld (DVB-H) antenna for a portable TV or tablet PC device. The antenna consists in a Printed-Inverted-F-Antenna (PIFA) loaded by a varactor diode. The radiating element has a size of 30 Â 30 Â 5 mm 3 and is mounted on a 230 Â 130 mm 2 ground plane. This antenna is able to maintain a return loss below À10 dB on a 8-MHz bandwidth reconfigurable channel from 450 to 900 MHz. Then, this radiating element reaches to cover the whole frequency band specification of the DVB-H standard while keeping a good efficiency despite of the strong miniaturization.ABSTRACT: Planar waveguides with controlled refractive index were produced using thin films of sol-gel derived organic-inorganic hybrids, so called di-ureasils. Spectroscopic ellipsometry was used to characterize the films thickness and refractive index. UV-laser direct-writing method was used to produce Y-splitter structures with coupling ratio of 50 % without the need of photoinitiators.

show abstract

Electrically Small Frequency-Agile PIFA-as-a-Package for Portable Wireless Devices

Cited by 45 publications

References 17 publications

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO₃ capacitor

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO₃ capacitor

Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements

Small reconfigurable PIFA for DVB‐H applications

Contact Info

Product

Resources

About

Electrically Small Frequency-Agile PIFA-as-a-Package for Portable Wireless Devices

Cited by 45 publications

References 17 publications

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO3 capacitor

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO3 capacitor

Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements

Small reconfigurable PIFA for DVB‐H applications

Contact Info

Product

Resources

About

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO₃ capacitor

A reconfigurable miniaturized planar inverted‐F antenna with integrated BaSrTiO₃ capacitor