S band narrow-wall slotted waveguide antenna For high-power applications

This work seeks designs of novel antennas, such as the rectangular waveguide narrow-wall longitudinal-aperture antenna arrays for S band high power applications. This antenna is designed to perform as a uniform array with minimum power reflected into the feed-waveguide. Based on the configuration, the double-narrow-wall-slot-array design is proposed for higher gain and grating lobes suppression. This work also deals with the S band compact narrow-wall slot-array proposed to be rendered as a conformal antenna structure. Moreover, this work proposes a circularly polarized narrow-wall longitudinal-aperture array design to produce both vertically and horizontally polarized radiated power. In the end, this work presents and discusses a couple of mechanisms for beam-steering of S band narrow-wall longitudinal-aperture array designs. The S-band narrow-wall longitudinal-aperture array design consists of four narrow wall longitudinal-slot radiators and one H-plane-bend-radiator. The design is a combination of computational and microwave network analysis techniques. First, HFSS is used to analyze the S-parameters, phases and radiated power of the narrow-wall longitudinal-slot radiators as well as the H-plane-bend radiator. Second the microwave network is applied to design a uniform linear array by neglecting the external coupling between the elements. Finally, Full-wave analysis is used to validate the array design from microwave network analysis. The double-narrow-wall slot-array design is the best narrow-wall longitudinal-slot array design with a peak gain of approximately 15dB. It consists of two identical narrow-wall-slot-arrays with a common broad wall. It has a much more uniform aperture electric field distributuion than the single array design. As a result, a higher gain with suppressed grating lobes is achieved. The S-band curved rectangular waveguide narrow-wall longitudinal-aperture antenna is proposed to perform as a conformal antenna structure. It is based on a rectangular waveguide bend so that it can be mounted easily on vehicles. It also consists of four narrow-wall longitudinal radiators and one H-plane-bend-radiator similar to the narrow-wall longitudinal slot-array. A circularly polarized narrow-wall longitudinal-aperture array design is also discussed. It produces both vertically and horizontally polarized radiated power. The configuration verified by simulation places adjacent narrow-wall longitudinal radiators orthogonally and keeps the centers of all four narrow-wall longitudinal radiators at the same level. A study of beam-steering capability is also conducted. It is divided into two parts. One moves the main beam on the plane orthogonal to the narrow-wall and orthogonal to the broad-wall of the rectangular waveguide. The other moves the main beam on the plane orthogonal to the narrow-wall and parallel to the broad-wall of the rectangular waveguide. The S-band narrow-wall longitudinal-slot array design works well both ways. Finally, the experiment is designed and conducted to validate the theoretical analysis results for the design of S-band narrow-wall longitudinal-slot array. The results obtained lead to the conclusion that there is good agreement between the theoretical and experiment results.

Name thesis:degree_name

Electrical Engineering

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Electrical and Computer Engineering

Year

2013

Author dc:creator

• Pan, Xuyuan

Contributors dc:contributor

• Christodoulou, Christos
• Constantine, Joseph
• Schamiloglu, Edl

• Slot antennas
• Antenna arrays
• Wave guides.

Language dc:language

English

Repository record dc:identifier

https://digitalrepository.unm.edu/ece_etds/199

OAI identifier oai:identifier

oai:digitalrepository.unm.edu:ece_etds-1198