Inset Fed Patch Antenna Calculator

A microstrip patch antenna with a circular slot is presented in this paper. The slot is located above the ground plane to provide impedance matching. The end of the patch is placed on the ground plane to provide the widest bandwidth for the circular slot. It is excited by two slots and two radiators. The patch is fed with the patch feed network (PFN). The VSWR is 2 for both bands. The antenna can be excited from TM10 mode in the upper and lower slots. It can be operating in the 2.45 GHz band and the 5 GHz band. The radiation pattern at the excitation level and the ground plane is cardioid. The polarization is vertical. The feed line should be as short as possible for the impedance matching but there should be enough length to excite the higher frequency band. The input impedance is also for the 50 Ω impedance matching.

The available space from an AR story is limited. Hence, one can use a double-slot patch antenna with an inset patch. This type of antenna has a wide bandwidth. The feed points are above the ground plane to provide impedance matching. The mode is for the TE11. The design is conventional with circular shaped patch and rectangular slot. The feed line is longer for higher frequency. It is also implemented with the double-slot patch design. The slot is designed in a way that the slot degrades the end of the patch. Hence, the end of the patch is placed towards the feed line. It is excited by two flat radiators. The feed point is a quarter wave length away from the end of the patch. The higher the FRF, the longer the feed line should be. The bandwidth is from 2 GHz to 6 GHz. The low side lobe is due to the slot at the end of the patch. The input impedance is 50 Ω at the resonance frequency. It is large and stable.

The rectangular slot patch antenna is a basic component of patch antenna to be used with the patch circuit. The slot is located above the ground plane to provide impedance matching. It can be operating in the 2.45 GHz band and the 5 GHz band. The VSWR is 2 for both bands. The radiation pattern at the excitation level and the ground plane is cardioid. The polarization is vertical. The feed line should be as short as possible for the impedance matching but there should be enough length to excite the higher frequency band.

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