4.1.1 Proposed filter design

3.2.3 Implementation and measured results

UWB Technology - Circuits and Systems

Figure 15.

Figure 16.

Figure 17.

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The prototype of the proposed antenna is shown in Figure 16. The performance

parameters of the fabricated designed antennas are measured. The comparison results of simulated and measured input |S11| of the antennas are found to be in very good agreement, as shown in Figure 17. The 10 dB bandwidth of the designed monopole antenna with SRR extended from 1.5 to 11 GHz to cover most wireless

Simulated and measured results of (a) monopole without SRR and (b) monopole with SRR [45].

Fabricated antenna (a) upper layer without SRR (b) upper layer with SRR, and (c) bottom layer [45].

(a) Antenna gain versus frequency and (b) simulated radiation efficiency with and without SRR [45].

The proposed filter is designed based on the filter described in Ref. [49] but with a new contribution which is notched controllable tunable four sharp rejection bands by adjusting the length of the coupling stub using diode switching matrix tools (instead of using PIN diodes).

Figure 18 shows the proposed microstrip UWB-BPF with tuned notched passband based on CRLH transmission-line unit cell. The optimized dimensions of the proposed filter are as shown in Table 4.

The dimension of the multi-mode section as shown in Figure 18 is 4.4 1.5 mm, the length of the shunted inductive line is 3.1 mm, and the overall dimension of the proposed filter is 16.4 5.0 mm. Based on the above description, the design procedure can be as follows:


Figure 18. The proposed filter [48].

