Abstract
This letter presents the design of a 3 rd order filtering waveguide aperture antenna based on coupled cavity resonators. Three offset-coupled rectangular waveguide cavities are employed in the design realizing two nested loaded-stubs without costing extra structure and size. The loaded-stubs introduce two controllable transmission zeroes and enhance the out-of-band realized gain selectivity. To validate the predicted results, a prototype operating at the X- band frequencies has been fabricated monolithically using the 3-D selective laser melting printing technique. The measured results are in very good agreement with the simulated results, showing a flat gain response of 7.0 ± 0.2 dBi from 9.5–10.5 GHz with very good out-of-band selectivity. The fractional bandwidth is about 10% at 10 GHz when S 11 = -20 dB. Compared to the previously designed filtering antennas, the proposed design has the advantages of stronger out-of-band gain selectivity and low profile.
Original language | English |
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Article number | 10015035 |
Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | IEEE Antennas and Wireless Propagation Letters |
Early online date | 11 Jan 2023 |
DOIs | |
Publication status | E-pub ahead of print - 11 Jan 2023 |
Keywords
- Aperture antennas
- cavity resonators
- coupling matrix
- filtering antennas
- selective laser melting (SLM)
- transmission zeros
- waveguide
- 3-D printing