Dual-polarised T/R antenna system suitable for FMCW altimeter radar applications

2006-10-01
Secmen, M.
Demir, S.
Hizal, A.
The authors propose a dual-polarised T/R antenna system that utilises a 3 dB 90 degrees hybrid coupler and a dual-polarised antenna. From the practical point of view the T/R isolation performance of this system can be made better than that of systems using circulators. There is no power loss both in transmit and receive modes compared to 6 dB total loss in a conventional system using a hybrid coupler and a single polarised antenna. To validate the system performance, a sample structure is realised for a C band application. The presented system analysis and measurements are for an above-ground application. The measurements show good agreement with the theoretical expectations.
IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION

Suggestions

Design of dual polarized wideband microstrip antennas
Yıldırım, Meltem; Alatan, Lale; Department of Electrical and Electronics Engineering (2010)
In this thesis, a wideband dual polarized microstrip antenna is designed, manufactured and measured. Slot coupled patch antenna structure is considered in order to achieve the wideband characteristic. Although rectangular shaped slot coupled patch antennas are widely used in most of the applications, their utilization in dual polarized antenna structures is not feasible due to space limitations regarding the positioning of two separate coupling slots for each polarization. For a rectangular slot, the parame...
Dual-Polarization Wideband Sub-6 GHz Suspended Patch Antenna for 5G Base Station
Ciydem, Mehmet; Miran, Emre A. (Institute of Electrical and Electronics Engineers (IEEE), 2020-07-01)
This letter presents a simple, compact, low-cost, low-profile, dual-polarization, suspended patch antenna design to operate in 3.3-3.8 GHz band for 5G base stations. The proposed antenna comprises a main radiating patch, a secondary parasitic patch, modified L-probe feeds, and a vertical metal wall. The main patch is capacitively driven by two feeds for dual (+/- 45 degrees slant) polarization. The vertical metal wall is used to increase the port isolation. The parasitic patch also helps further improvement...
Circumferential Traveling Wave Slot Array on Cylindrical Substrate Integrated Waveguide (CSIW)
Bayraktar, Omer; Aydın Çivi, Hatice Özlem (Institute of Electrical and Electronics Engineers (IEEE), 2014-07-01)
Traveling wave slot array on cylindrical substrate integrated waveguide (CSIW) is designed, fabricated and measured at K-band. CSIW is formed by wrapping the substrate integrated waveguide (SIW) around the cylinder in the circumferential direction. 16 element longitudinal slot array on the broad wall of single CSIW is designed by the Elliot's design procedure. The spacings between the slot elements are determined to reduce the half power beam width (HPBW) and to obtain good matching at 25 GHz. A 4 x 16 slot...
Nested U-ring resonators: a novel multi-band metamaterial design in microwave region
Turkmen, O.; EKMEKÇİ, Evren; Sayan, Gönül (Institution of Engineering and Technology (IET), 2012-07-17)
In this study, a novel metamaterial topology, called M-band nested U-ring resonator (M-NURR), is proposed to provide multiple band operation with an electrically small and geometrically simple unit cell design. The M-NURR unit cell has M-nested and unconnected U-shaped metal rings printed on a dielectric substrate where each ring is primarily associated with a distinct LC type resonance frequency where L and C stand for inductance and capacitance, respectively. Therefore this M-NURR topology has the novel p...
Metamaterial absorber-based sensor embedded into X-band waveguide
SABAH, CUMALİ; TURKMEN-KUCUKSARİ, OZNUR; Sayan, Gönül (Institution of Engineering and Technology (IET), 2014-07-17)
A novel metamaterial sensor, integrated with an X-band waveguide, is proposed for high-resolution measurements of variations in the dielectric constant and/or the thickness of a superstrate layer that covers a pair of absorber unit cells. Variations in superstrate parameters are potentially caused by physical, chemical or biological factors, and can be detected by measuring the corresponding shifts in the resonance frequency of the metamaterial sensor. It is estimated by simulation results that resolution l...
Citation Formats
M. Secmen, S. Demir, and A. Hizal, “Dual-polarised T/R antenna system suitable for FMCW altimeter radar applications,” IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION, pp. 407–412, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66336.