Considerations for Harmonics Distribution in Aperture-Tuned Inverted-F Antenna for Cellular Handheld Devices

Oezdamar, Oguzhan; Weigel, Robert; Hagelauer, Amelie; Solomko, Valentyn

doi:10.1109/tmtt.2020.2996195

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…8. The demonstrator is based on a mechanically-reconfigurable inverted-F antenna, which has been described by the authors in detail in one of the previous publications [14]. In addition to penta-band antenna we have also assembled a quad-band modification (not shown in the figure), which comprises a metal short instead of the L S − C S UHB open.…”

Section: Resultsmentioning

confidence: 99%

“…The parts are designed for maximum 80 V RF voltage handling capabilities. Such voltage handling provides sufficient margin for practical large-signal operation -the maximum RF voltages against ground at the mounting points of the aperture tuners are expected not to exceed 70 V [14]. The circuit design of the RF capacitors is outside the scope of the paper, therefore the reader is referred to [15] for detailed description of a similar IC.…”

Section: Resultsmentioning

confidence: 99%

“…2(b). The model consists of three individual transmission lines T L F S , T L T F and T L T O representing the respective sections of the radiating arm near the ground plane, the resistance R RO modeling the radiation and loss resistance of the antenna [14], and the shunt impedance Z T representing the aperture tuning network. The model is valid for estimating impedances along the radiating element of antenna, thus providing a simple tool for systematic design and analysis of the antenna tuning concept.…”

Section: Design Of Penta-band Tunable Ifamentioning

confidence: 99%

“…1. The reader is referred to authors' previous paper [14], where the extraction method is described in detail.…”

Section: Design Of Penta-band Tunable Ifamentioning

confidence: 99%

“…Fig. 6(a) Directional vector c for (14) ( Once the mechanical configuration of the tuned IFA is defined and fixed, the VSWR at the feed is transformed (simplified) into a function of two variables, C T 1 and C T 2 , and frequency:…”

Section: F Antenna Control For Carrier Aggregationmentioning

confidence: 99%

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Penta-Band Inverted-F Antenna Tuned by High-Voltage Switchable RF Capacitors

Solomko

Oezdamar

Weigel

et al. 2021

IEEE Open J. Antennas Propag.

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A penta-band inverted-F antenna (IFA) tuned by two high-voltage aperture tuning networks is presented in the paper. The design is based on a singe, non-bended radiating arm IFA. Each of the two aperture tuners comprises a high-voltage switchable RF capacitor IC in parallel with an off-chip inductor. The antenna can be tuned to any of the 5 bands of sub-4 GHz cellular spectrum between 690 MHz and 3800 MHz with return loss exceeding 6 dB at the feed over more that 95 % of the total frequency range. A systematic design and analysis of the penta-band IFA based on transmission line model is provided, tuning approach for carrier aggregation enablement over two bands at a time is discussed. A nonlinear performance of the designed antenna with RF capacitors fabricated in bulk-CMOS RF-switch technology is demonstrated. INDEX TERMS antenna tuning, aperture tuning, C-tuner, carrier aggregation, cellular user equipment, harmonics, high-voltage RF switch, inverted-F antenna, mobile handset, RF switch, switchable capacitor, user terminal

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Design Of Penta-band Tunable Ifamentioning

confidence: 99%

“…1. The reader is referred to authors' previous paper [14], where the extraction method is described in detail.…”

Section: Design Of Penta-band Tunable Ifamentioning

confidence: 99%

Section: F Antenna Control For Carrier Aggregationmentioning

confidence: 99%