Design of balanced band-notched UWB filtering high-gain slot antenna

Ching Her Lee, Pei Shan Ho, Chung I.G. Hsu, Hsun Hsiang Chen

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A balanced band-notched ultra-wideband (UWB) filtering slot antenna with high gain is proposed in this article. The high gain is achieved by deploying two identical open-ended T-shaped slot radiators in a back-to-back fashion. These two slot radiators are fed by differential-mode (DM) signals output from a balanced band-notched UWB bandpass filter (BPF) constructed using a stepped-impedance one-wavelength (1λ) slotline resonator. The DM notched band for blocking the 5-GHz WLAN band signals is generated by symmetrically placing a pair of microstrip resonators and a pair of slotline resonators, both being half-wavelength long, on the two sides of the 1λ slotline resonator. Measured and simulated DM return loss responses agree quite well. The common-mode (CM) response is excellent with a measured CM return loss of below 0.54 dB in 1-12 GHz. As compared with its single-ported standalone slot antenna counterpart, the proposed balanced filtering slot antenna exhibits 2-dB-higher measured peak realized gains at, if not all, most frequencies in the notch-band-excluded passband.

Original languageEnglish
Pages (from-to)615-620
Number of pages6
JournalMicrowave and Optical Technology Letters
Issue number3
Publication statusPublished - 2018 Mar

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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