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We present a new technique for designing planar microwave lenses with broadband, true-time-delay response types. The lenses examined in this work are planar structures with circular apertures populated with numerous spatial time-delay units (TDUs). Each TDU is the unit cell of an appropriately designed lowpass frequency selective surface (FSS) that provides a desired time delay over a wide frequency...
In this paper, we apply this technique to a class of MEFSSs with second-order band-pass responses capable of providing a phase shift of 0180° in their pass-band. We show how dynamic phase shift tuning can be obtained. To prove the proposed tuning concept, a waveguide version of a second-order band-pass MEFSS is fabricated and tested at X-band.
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