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A broadband dual‐polarized magnetoelectric (ME) dipole filtering antenna is investigated in this letter. The antenna is composed of radiation patches, vertical shorting patches, feed microstrip lines and a ground plane. By properly changing the length of the feeding microstrip line, a radiation null is generated at upper passband edge. On the other hand, by nesting a parasitic patch inside the radiation patch, another radiation null is introduced into the upper passband edge successfully. The utilization of the inherent lower passband edge radiation null of ME‐dipole and the introduction of the aforementioned two radiation nulls make the antenna obtain a good filtering response. For verification, a prototype is designed, fabricated, and relevant measurements are obtained, which agree well with the simulated ones. The measured results show that the antenna achieves a relative bandwidth of 71.4% (2.7–5.7 GHz) and the out of band rejection level is higher than 13.36 dB. Moreover, the antenna has a peak‐realized gain of 8.43 dBi and stable radiation patterns are obtained in the whole passband. [ABSTRACT FROM AUTHOR]

An efficient technique to realize dual‐band multi‐polarized shared‐aperture slot antenna array is proposed in this paper, featuring in all‐metal, low‐profile, light‐weight and high radiation efficiency. The cavity‐backed longitudinal slots are used at L‐band for vertical polarization, while horizontal and vertical polarizations are both achieved at C‐band, by utilizing interleaved ridged waveguides with two different kinds of slots. A coaxial‐feed end‐grounded metallic bridge is developed to excite the L‐band cavity‐backed slots, so the volume and weight of the L‐band cavity can be obviously reduced. To further make the whole antenna structure compact and tight, the reduced L‐band cavity is embedded into the serration, surrounding by two adjacent C‐band ridged waveguides for vertical polarization and one for horizontal polarization. An array prototype, which consists of two L‐band single‐polarized antennas and four pairs of C‐band dual‐polarized antennas, is fabricated and measured. Experimental results are well consistent with the simulated ones, showing a satisfying impedance bandwidth of 12% in L‐band and 5.5% in C‐band, and besides high radiation efficiency above 85% for both bands. The all‐metallic structure of this proposed array provides the thermal and mechanical advantages for space‐borne synthetic aperture radar (SAR) application. [ABSTRACT FROM AUTHOR]