초록 ▼

A tuneable impedance surface for steering and/or focusing a radio frequency beam. The tunable surface comprises a ground plane; a plurality of elements disposed a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and a capacitor arrangement for co

A tuneable impedance surface for steering and/or focusing a radio frequency beam. The tunable surface comprises a ground plane; a plurality of elements disposed a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and a capacitor arrangement for controllably varying the capacitance of at least selected ones of adjacent elements. A method of tuning the high impedance surface allows the surface to mimic, for example, a parabolic reflector or a diffraction grating.

대표청구항 ▼

A tuneable impedance surface for steering and/or focusing a radio frequency beam. The tunable surface comprises a ground plane; a plurality of elements disposed a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and a capacitor arrangement for co

A tuneable impedance surface for steering and/or focusing a radio frequency beam. The tunable surface comprises a ground plane; a plurality of elements disposed a distance from the ground plane, the distance being less than a wavelength of the radio frequency beam; and a capacitor arrangement for controllably varying the capacitance of at least selected ones of adjacent elements. A method of tuning the high impedance surface allows the surface to mimic, for example, a parabolic reflector or a diffraction grating. f the antenna (A1, A2) and aimed at the target (A1, A2), so that the optical sight (S, S1, S2, S3, S4, S5) is arranged to be fitted to certain fastening elements (K, K1, K2) for the antenna (A1, A2), which fastening elements (K, K1, K2) are provided for the attachment and aiming of the antenna (A1, A2) and comprise adjustment elements (S1a, S1b, S2a, S2b) to change the position of the fastening elements (K, K1, K2), the optical sight (S, S1, S2, S3, S4, S5) is arranged to be aimed at the target (A1, A2) by changing the position of the fastening elements (K, K1, K2) by means of said adjustment elements (S1a, Sib, S2a, S2b) and the antenna (A1, A2) is arranged to be fitted to the fastening elements (K, K 1, K2) after the position of the fastening elements (K, K1, K2) has been changed into the desired position by means of the sight (S, S1, S2, S3, S4, S5). 12. The apparatus according to claim 11, characterized in that the sight (S, S1, S2, S3, S4, S5) comprises a sight portion (S1) to which a refractive element (S3) is attached for the purpose of changing the direction of the aim line (TL). 13. The apparatus according to claim 12, characterized in that the aim line (TL) of the sight (S, S1, S2, S3, S4, S5) adapted so as to be attached to antenna fastening elements is adapted so as to be congruent with the direction of the main lobe (PK) of the antenna (A1, A2). 14. The apparatus according to claim 11, characterized in that the aim line (TL) of the sight (S, S1, S2, S3, S4, S5) adapted so as to be attached to antenna fastening elements is adapted so as to be congruent with the direction of the main lobe (PK) of the antenna (A1, A2).