Executive Summary : | Although radar was invented in the 20th century to detect invader ships in World War II, with the advancement of semiconductor technology, radar has become essential to our present daily lives. Radar technology has recently been used in contactless remote human monitoring, which receives extreme importance in COVID 19 phase. A variety of detection and sensing applications are also indispensable to provide safety measures in industrial and automotive applications in the presence of adverse environmental conditions. The narrowband low power IoT based radar detection application is become integral part of 5G deployable technology. These kind of applications required multipurpose compact radar, providing multi target measurement with high range resolution and accuracy. This proposal aims in developing the TMFD MIMO array to fulfill the increasing demand of accurate and fast multi-target radar detection application. The harmonic frequencies generated as the outcome of switching periodicity present in the time modulation strategy, used for range-angle dependent harmonic beamforming. This harmonic beams can simultaneously and independently used for multiple target detection in the short range vicinity. Initially, 5.8 GHz is chosen as the design frequency of the proposed antenna array as per the commercial choice, in near future the prototype will be scale to mmW band of 24.25 GHz as per the government policy to deploy the 5G mmW technology in India. The proposed TMFD MIMO array produce two harmonic beams for narrowband IoT based radar application. Whilst, for wide bandwidth application, one single harmonic band will play the role of directive pattern generation by eliminating all other undesired harmonic radiation using FPGA driven in-phase/quadrature TM scheme. Thus, a multipurpose target detection system will be developed from the same array aperture and RF module. The proposal presents a twofold work plane as discussed below,
i) Design a TMFD antenna array of low loss, flexible substrate for high frequency application. The array admits to harmonic beamforming and beam scanning capability. ii) The MIMO radar configuration with orthogonally feed co-located antenna elements exhibit a virtual effective aperture larger than the physical aperture yields efficient target detection. Afterwards, the combined system will be ready for packaging and distribution. |