Variations of P‐shape microstrip antennas for multi‐band dual polarised response

Abstract

A novel design of a P‐shape microstrip antenna is proposed. The stub in the P‐shape patch modifies the frequency and resonant mode distributions at second‐order TM20 mode which along with TM10 and TM01 modes yields dual‐polarised triple‐frequency response, showing 1−1.5% of impedance bandwidth (BW) at each frequency. To enhance the gain, air‐suspended designs for the P‐shape patch are proposed. It yields the broadside gain of 1.5−5 dBi across three frequencies. Enhancement in BW of the P‐shape patch is obtained by using its gap‐coupled variations leading to 69‐ or 96‐shape configurations. On a thinner substrate, these gap‐coupled antennas give BW of 3−5% across three frequencies.

Keywords

• BW
• P‐shape patch
• gap‐coupled variations
• 96‐shape configurations
• gap‐coupled antennas
• P‐shape microstrip antenna