Highly Efficient Broadband Pyramidal Horn Antenna with Integrated H-Plane Power Division

Charalampos Stoumpos*, Jean-Philippe Fraysse, George Goussetis, Cebrián García González, Ronan Sauleau, Hervé Legay

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The concept and development of a highly efficient pyramidal horn is described. The radiating element comprises a rectangular radiating aperture fed by two smaller flared square waveguide sections via a bifurcated H-plane surface discontinuity. For the simultaneous feeding of the two-port radiating element, the total antenna includes a compact H-plane power divider. Properly weighted TE n0 modes (n\in N) are excited at the output of the two flared waveguide sections. The bifurcation is responsible for the recombination of the incoming fields. The low-dispersive modal coupling coefficients (or transmission coefficients of the bifurcation's generalized scattering matrix) between the excitation and the aperture modes enable the broadband realization of the targeted aperture modal content. The common waveguide section is responsible for the phase alignment of the aperture modes. The design method targets a preoptimized model, which approximates the amplitude of the aperture modes TE m0 (m = 1, 3, 5) in the order of 1/m and minimizes their relative phase difference. Finally, maximum aperture efficiency can be achieved by fine tuning and with low computational complexity. Design principles are given and illustrated by means of an example involving an antenna with aperture size of about 2.8λ 0 × 1.4λ 0 (λ 0 is the free-space wavelength at the central frequency of operation). The antenna exhibits aperture efficiency levels above 95% over the entire Ku-Tx-band (10.7-12.75 GHz), as well as a compact profile (4.1λ0). The measured results of a prototype manufactured through milling verify experimentally the numerically predicted performance.

Original languageEnglish
Pages (from-to)1499-1504
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Issue number2
Early online date15 Sept 2021
Publication statusPublished - Feb 2022


  • Aperture antenna
  • Aperture efficiency
  • Integrated power division
  • Mode-matching
  • Pyramidal horn

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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