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

被引：1

作者：

Narita, Yuto ^{[1
]}

Nozawa, Koichi ^{[1
]}

Tanba, Noriyuki ^{[2
]}

Hara, Shinji ^{[2
]}

Hirayama, Hiroshi ^{[1
]}

机构：

[1] Nagoya Inst Technol, Elect & Mech Engn Dept, Nagoya 4668555, Japan

[2] Nagoya Univ, Inst Mat & Syst Sustainabil, Ctr Integrated Res Future Elect Div, Nagoya 4648601, Japan

来源：

ENERGIES | 2023年 / 16卷 / 05期

关键词：

microstrip patch antenna; microwave power transfer; active integrated antenna; class-F load; harmonic tuning antenna; characteristic mode analysis (CMA); MICROSTRIP ANTENNAS;

D O I：

10.3390/en16052128

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

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 degrees, respectively; at the third harmonic frequency, they were -0.92 dB and -179.5 degrees, 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.

引用

页数：14

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