A 5 × 8 Butler Matrix Based on Substrate Integrated Waveguide Technology for Millimeter-Wave Multibeam Application
Chong Qin, Fu‐Chang Chen, Kai‐Ran Xiang
Abstract
A 5 × 8 Butler matrix (BM) operating in the millimeter-wave band is presented in this letter. The matrix is extended from two 3 × 4 Butler matrices by adding two couplers and one power divider, providing an equal amplitude signal distribution with five phase differences between the adjacent output port (0°, ±45°, ±135°). In order to reduce the number of crossover and complexity of the matrix structure, a dual-layer and symmetrical substrate integrated waveguide (SIW) structure is used to design the proposed BM. To verify the concept, an experimental BM is designed and fabricated as the feeding network of a slot antenna array, achieving five beams in the frequency range of 27.8-30.8 GHz.
Topics & Concepts
Power dividers and directional couplersExtremely high frequencyCrossoverAntenna (radio)WaveguidePort (circuit theory)Matrix (chemical analysis)Substrate (aquarium)Power (physics)Phase (matter)Multi-band deviceMillimeterSIGNAL (programming language)Materials sciencePhysicsOptoelectronicsElectrical engineeringElectronic engineeringEngineeringOpticsComputer scienceGeologyComposite materialProgramming languageOceanographyQuantum mechanicsArtificial intelligenceMicrowave Engineering and WaveguidesAdvanced Antenna and Metasurface TechnologiesMillimeter-Wave Propagation and Modeling