This letter describes the integration of microstrip slot array antenna with amorphous silicon solar cells. To appraise the antenna, a 2×2 circularly polarized microstrip slot array antenna integrated with amorphous silicon solar cells using a stacked design method was measured. The results show that the gain of the antenna is almost unchanged after the integration of the amorphous silicon solar cells and the axial ratio decreases to 1.4 dB. The amorphous silicon solar cells and the microstrip slot array antenna are perfectly combined, the interference between the solar cells and the antenna is minimal. The integration saves a lot of space, and has the ability to self-sustaining power generation, thus providing reliable and long-term communication for various satellite communication systems.

A dual-band focused transmitarray antenna designed by using frequency selective surfaces (FSS) technique is proposed in this paper. Compared with the traditional transmitarray antenna, the proposed antenna has advantages of good ability to focus electromagnetic wave in the dual-band, high resistant of poor measurement environment and easy to process. The transmitarray consists of four identical metal phase shift layers, each of which is separated by an air gap. The elements distributed on metal layer are composed of a I-shaped slot at the center and four L-shaped slots with central symmetry. The change of I-shaped slot length affects the change of phase in low frequency band and the change of L-shaped slot length affects the change of phase in high frequency band. The mutual coupling between the two kinds of slots can be neglected. The proposed antenna consisting of a transmitarray and a feed has been analysed, simulated, and measured. The results show that the average focal spot diameter (SD) is 35.2 mm at 12 GHz and 24.5 mm at 18 GHz, and the dual-band focused transmitarray antenna can operate in two frequency bands 11.8-12.2 and 17.8-18.1 GHz. Simulated and measured results show that the proposed antenna has good concordance, making it possible for various microwave measurements.

A novel, simple structure, low profile, wideband antenna with back-cavity was first proposed in this paper. The wideband antenna is derived from the planarization improvement of the sleeve dipole antenna. The antenna mainly consists of five parts, which are planar sleeve dipole, L-shaped feeding strip, substrate, coaxial feed, and back cavity. The planar sleeve dipole and the L-shaped strip are printed on both sides of the substrate plate. To verify the design, the antenna was pro-cessed and measured with the size of $0.5\lambda _{\text L} \times 0.5\lambda _{\text L} \times 0.16\lambda _{\text L}$ , where $\lambda _{\text L}$ is the wavelength of the low frequency. From the measured results, the proposed antenna achieves a wide im-pedance bandwidth of 81.4% from 3.0 to 7.12 GHz with a return loss more than 10 dB. Moreover, the measured gain of the antenna is 6 - 9.5 dBi, and the radiation pattern is very stable over the entire frequency bandwidth.

A focused transmitarray antenna is presented in this Letter. To appraise the antenna, a quad‐metallic‐layer focused transmitarray antenna using I‐shaped all‐metal slot elements with an air gap between every two layers has been analysed, simulated and measured. It is illustrated that the electric field strength value at a distance of 3.1λ ₀ from the transmitarray antenna reaches a maximum at 9.3 GHz operating frequency. It is the first time that a focal plane of approximately one wavelength has been achieved with a focused transmitarray antenna consisting of all‐metal elements. Simulated and measured results show that the proposed antenna has good concordance, making it possible for microwave measurements.