Reconfigurable and Tunable Filtenna for Cognitive LTE Femtocell Base Stations

Table 1

Comparison between the proposed filtenna and related works.

Reference	Narrowband frequency tuning (GHz)	Wideband mode (GHz)	Number of switches	Size ()
[15]	3.9 to 4.82	3.8–6	1 PIN diode; 2 varactors	1.24 × 0.56
[23]	2.4; 4.2; 3.3; 5.4	2–10	2 FETs	0.69  ×  0.69
[24]	0.58; 0.86; 1.1; 2.48	0.7–3.44 (−6 dB)	2 PIN diodes; 2 varactors	0.49 × 0.27
[25]	2.48; 3.5; 5.5; 2.45; 5.49	2.95–10.92	4 PIN diodes	0.68 × 0.68
[26]	1.1; 2.25; 3.1	1.0–3.2	8 PIN diodes	1.06 × 1.04
[27]	2.75; 2.86; 3.1; 3.26	2.63–3.7	12 PIN diodes	1.22 × 0.91
Proposed filtenna	2.55; 2.84; 3.05; 3.2	1.35–6.2	2 PIN diodes; 2 varactors	0.73 × 0.54