Single Feed Stacked Circularly Polarized Patch Antenna For Dual Band NavIC Receiver of Launch Vehicles

A compact circular polarized antenna for multiband NavIC receivers is presented. Concept of stacked patches fed through single coaxial probe is employed. Two square patches are stacked one above the other to achieve dual band operation. Principle of corner chopping is used at L5 frequency band and a combination of corner chopping and stubs are used at L1 frequency band to obtain circular polarization and good return loss.The antenna is designed to receive L1 (1575.42 MHz ) band GPS signal and L5(1176.45MHz) band IRNSS signal for the NavIC receiver on board ISRO launch vehicles with omni directional coverage.The proposed antenna is designed, simulated and fabricated. This antenna has achieved a bandwidth of 2.1% and 3.5% at L5 and L1 frequency bands respectively. The measured gain at at L5 frequency is 5.9dBi and L1 frequency is 6.1dBi. Realization aspects, simulated and measured results are discussed