A New Approach to Design Microstrip Patch Antenna with Wideband Harmonic Suppression

A new microstrip patch antenna with wideband harmonic suppression is presented in this paper. Compared to the traditional patch antenna, a dual-point feeding technique is adopted in our patch antenna design. This feeding method is able to excite the fundamental TM
10
mode and control the higher order harmonics at the same time. Detailed analysis for the harmonic modes control is provided, and the performance of the antenna is simulated and optimized. It is indicated that the designed patch antenna not only has a good radiation pattern and stable gain at the working frequency f
0
, but also can achieve the harmonic suppression up to 2.8f
0
with resorting to the proposed dual-point feeding method. Simulated and measured results are given, well validating the feeding approach.