Transponder Designs for Harmonic Radar Applications

Figure 4

Examples of different transponders found in the literature: (a) dipole with inductive loop [19], (b) monopole with loading coil [20], (c) dipole [30], (d) fractal transponder based on modified Minkowski loop [31], (e) mm wave transponder using patch antennas [33], and (f) dipole on a printed circuit board (PCB) and a regular wire dipole [40]. The different transponder implementations are not to scale, and details on some of these are found in Table 1.

(a)

(b)

(c)

(d)

(e)

(f)