Novel dual-polarized and closely dual-band filtering patch antenna array with good band-notched function

A novel compact dual-polarized and closely dual-band filtering antenna with good band-notched function for WLAN applications is proposed, where a cross slot pair and four shorting pins, together with four parasitic strips are loaded to introduce two radiation null, thus realizing a good band-notched property between two close operation bands. Due to no extra filtering circuits, the proposed antenna not only exhibits a very compact size, but also low insertion loss for achieving higher gain at the two operation bands. In this work, two radiation nulls are obtained respectively at 5.35 GHz and 5.55 GHz, a good filtering performance achieved in the stopband. Meanwhile, its realized gain can arrive at 8.1 dBi and 9.1 dBi at the two operation bands. On the basis, a 2×4 antenna array is well designed. Its realized gain can be up to 17.2 dBi and 18.2 dBi at two working bands while lower than 10 dBi in the stopband.