Highly integrated PA-PIFA with a wide frequency tuning range

Research output: Contribution to journalArticlepeer-review


  • Minyong Huang
  • Yunlong Lu
  • Qi Ang Zhu
  • Jifu Huang
  • Taijun Liu

Colleges, School and Institutes

External organisations

  • Ningbo University


This letter presents a highly integrated power amplifier (PA)-antenna with capability of frequency tuning. A planar inverted-F antenna (PIFA) is used to directly match the PA transistor. This mitigates the lossy output matching network (OMN) in the PA-integrated antenna (PAIA). In order to achieve a wide frequency tuning range, a combination of capacitors are loaded at the PIFA to control the antenna input impedances, so that matching can be maintained with frequency tuning. The antenna analysis and design procedure of the tunable PAIA are detailed. For verification, a prototype is designed, fabricated and measured. Experimental results show that the frequency tuning range of the proposed PAIA covers from 2 to 4 GHz. Over this frequency tuning range, the effective isotropic radiation power (EIRP) and power-added efficiency (PAE) are higher than 40.5 dBm and 60% at the input power of 26.5 dBm, respectively.

Bibliographic note

Publisher Copyright: IEEE


Original languageEnglish
JournalIEEE Antennas and Wireless Propagation Letters
Early online date2 Jun 2021
Publication statusE-pub ahead of print - 2 Jun 2021


  • Active integrated antennas, Antennas, Capacitors, Impedance, Impedance matching, Loaded antennas, output impedance matching network elimination, PIFA, Transistors, tunable, Tuning

ASJC Scopus subject areas