H-Shaped Slot Antenna with Harmonic Tuning Function and Integrated Power Amplifier

Yuto Narita, Koichi Nozawa, Noriyuki Tanba, Shinji Hara and Hiroshi Hirayama ()
Additional contact information
Yuto Narita: Electrical and Mechanical Engineering Department, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Koichi Nozawa: Electrical and Mechanical Engineering Department, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Noriyuki Tanba: Center for Integrated Research of Future Electronics Division, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan
Shinji Hara: Center for Integrated Research of Future Electronics Division, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan
Hiroshi Hirayama: Electrical and Mechanical Engineering Department, Nagoya Institute of Technology, Nagoya 466-8555, Japan

Energies, 2023, vol. 16, issue 5, 1-14

Abstract: This study proposes a patch antenna with an H-shaped slot with direct matching and harmonic tuning (rejection) functions for microwave power transfer. This antenna enables an integrated active antenna in which the power amplifier and antenna are directly connected without using a matching circuit for the fundamental frequency and harmonic rejection filter to improve the efficiency of the amplifier. The integrated design also reduces the total size of the amplifier and antenna, allowing for a higher-density array antenna. Characteristic mode analysis was performed to explain the working principle of the harmonic rejection function. The designed antenna at 5.8 GHz was fabricated to study its harmonic tuning function. The magnitude of the reflection coefficient of the proposed antenna was at a fundamental frequency of −40.4 dB for an amplification device with an optimum load impedance of 100 Ohm. At the second harmonic frequency, the magnitude and phase of the reflection coefficient at the second harmonic frequency were −0.79 dB and −177.6°, respectively; at the third harmonic frequency, they were −0.92 dB and −179.5°, respectively. Finally, the designed antenna was integrated into an amplifier circuit to verify that it achieved similar drain efficiency as when using the impedance tuner. It was confirmed that the harmonic rejection function of the proposed antenna increases the drain efficiency of the integrated power amplifier by 5.5%. The measurements revealed that this antenna is suitable for use in microwave power transfer because of its fundamental matching and harmonic-processing capabilities.

Keywords: microstrip patch antenna; microwave power transfer; active integrated antenna; class-F load; harmonic tuning antenna; characteristic mode analysis (CMA) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/5/2128/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/5/2128/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:5:p:2128-:d:1076843

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().