A frequency-agile compact array with a reconfigurable decoupling and matching network

Yong Cai*, Y. Jay Guo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


A new frequency-agile compact antenna array incorporating a reconfigurable decoupling and matching network (DMN) is presented. The array consists of two printed monopole antennas, each loaded with a p-i-n diode. By changing the p-i-n diode states through an inductive biasing line, the array operating frequency can be tuned to the 2.5-or 3.5-GHz band. The array interelement spacing is chosen to be as small as 0.05 λ0 at 2.5 GHz, which results in a strong mutual coupling between antenna ports. A reconfigurable DMN is proposed to reduce the mutual coupling when the array frequency is switched. Measured results show that the use of the DMN realizes a matched (S11 ≤-10 dB) and decoupled (S21 ≤-20 dB) bandwidth of 150 and 160 MHz in the lower and higher bands, respectively. In addition, compared to the strongly coupled array, at least 9% antenna total efficiency improvement is measured over a 125-MHz bandwidth in both the lower and the higher bands. The effect of the ohmic loss in the DMN on the antenna correlation is also investigated.

Original languageEnglish
Article number6024434
Pages (from-to)1031-1034
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Publication statusPublished - 2011
Externally publishedYes


  • Decoupling and matching network
  • mutual coupling
  • p-i-n diodes
  • reconfigurable antenna


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