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| Content Provider | IET Digital Library |
|---|---|
| Author | Mehboodi, Elahe Movahhedi, Masoud Heidari, Abbasali |
| Abstract | This study proposes a new technique for generating dual polarisation in spiral antennas. The proposed antenna is achieved by creating stair discontinuities in spiral antenna arms, entitled stair arm width (SAW) spiral antenna. Commonly, the spiral antenna is activated in direction finding systems, especially in wideband monopulse systems. Capability of generating sum and difference beams over a wide bandwidth is another feature of the proposed antenna. Radiation characteristics and generated modes of a wideband dual polarised four-arm SAW antenna in comparison with the modulated arm width (MAW) and conventional spiral antennas are presented. The cross-polarisation gain of SAW antenna, compared to MAW antenna, is decreased in difference pattern, which improves the antenna circular polarisation purity. Moreover, the input impedance of the proposed antenna with high n s is more stable than MAW antenna over a wide bandwidth due to gradual discontinuities. Finally, a prototype four-arm SAW spiral antenna is built and evaluated with an available beamformer for 5.8–10 GHz frequency bandwidth. Simulated and measured radiation characteristics proved dual circularly polarised and wideband properties of the antenna. |
| Starting Page | 607 |
| Ending Page | 611 |
| Page Count | 5 |
| ISSN | 17518725 |
| Volume Number | 12 |
| e-ISSN | 17518733 |
| Issue Number | Issue 4, Mar (2018) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-map/12/4 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-map.2017.0689 |
| Journal | IET Microwaves, Antennas & Propagation |
| Publisher Date | 2017-11-16 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Antenna Circular Polarisation Purity Antenna Radiation Pattern Array Signal Processing Bandwidth 5.8 GHz to 10 GHz Broadband Antenna Direction Finding System Microwave Antenna Monopulse System Polarisation Signal Processing And Detection Single Antenna Spiral Antenna Stair Arm Width Spiral Antenna Wideband Dual-Polarised SAW Spiral Antenna |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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