Terahertz antenna with tunable filtering

Mohd Farman Ali; Zaid Jawed; Vinamra Raj; Gaurav Varshney

doi:10.1364/AO.475609

Applied Optics
Vol. 62,
Issue 2,
pp. 284-290
(2023)
•https://doi.org/10.1364/AO.475609

Terahertz antenna with tunable filtering

Mohd Farman Ali, Zaid Jawed, Vinamra Raj, and Gaurav Varshney

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Mohd Farman Ali, Zaid Jawed, Vinamra Raj, and Gaurav Varshney, "Terahertz antenna with tunable filtering," Appl. Opt. 62, 284-290 (2023)

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Abstract

A terahertz (THz) antenna with tunable filtering is designed and numerically studied. A slotted monopole radiator with defected ground structure is used for operating with wideband response with an impedance bandwidth in the range of 3.80–11.98 THz for ${S_{11}} \le - 10\;{\rm dB}$. A slot is engraved in the radiator for obtaining the filtering characteristics in the antenna response. By varying its chemical potential, the frequency band 5.05–6.69 THz with graphene material can provide the tunability in the frequency and bandwidth of the filtered band in the antenna response. Furthermore, the antenna can provide radiation efficiency of more than 90% and gain with a peak value of 6.6 dBi in the passband.

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Antenna Configuration		Bandwidth (THz) ( $S_{11} < - 10 d B)$	Filtered Frequency Band (THz) ( $S_{11} \geq - 10 d B)$
Antennas without slot in the radiator	Case I	11.16–11.24	–
	Case II	4–12.5	–
	Case III	2.85–12.342	–
	Case IV	3.808–11.985	–
Antennas with slot in the radiator	Antenna 1	11.16–11.23	–
	Antenna 2	3.808–12.456	4.957–6.332
	Antenna 3	3.000–11.342	4.753–9.354
	Antenna 4	3.556–11.985	5.056–6.694

Reference	Antenna Structure	Antenna Size $(µ m^{3})$	Operating Frequency (THz)	RE (%)	Peak Gain (dBi)	Filtering Characteristics	Tunability in Filtering Band
[40]	${G r a p h e n e / S i O}_{2}$	$120 \times 140 \times 3.9$	0.8–3.34	–	–	no	no
[43]	${M e t a l / g r a p h e n e / S i O}_{2}$	$180 \times 160 \times 10$	0.17–4.21	55	2.4	yes	no
[44]	${G r a p h e n e / S i O}_{2}$	$120 \times 60 \times 50$	2.5–3.5	21.5	3.17	no	no
[45]	${G r a p h e n e / S i O}_{2}$	$60 \times 60 \times 1.6$	5–15	–	–	no	no
[46]	${G r a p h e n e / S i O}_{2}$	$120 \times 93 \times 25$	0.9–1.2	44	2.45	no	no
[24]	Graphene/quartz	$532 \times 500 \times 70$	0.68–1.63	–	7.45	no	no
[47]	${D R / g r a p h e n e / S i O}_{2}$	$50 \times 50 \times 17.85$	7.76–12.5	–	8.15	no	no
[34]	${M e t a l / g r a p h e n e / S i O}_{2}$	$20 \times 24 \times 1.9$	4.76–19	80	6.4	yes	yes
This work	${M e t a l / g r a p h e n e / S i O}_{2}$	$50 \times 50 \times 3$	3.56–11.98	90	6.6	yes	yes

Antenna Configuration		Bandwidth (THz) ( $S_{11} < - 10 d B)$	Filtered Frequency Band (THz) ( $S_{11} \geq - 10 d B)$
Antennas without slot in the radiator	Case I	11.16–11.24	–
	Case II	4–12.5	–
	Case III	2.85–12.342	–
	Case IV	3.808–11.985	–
Antennas with slot in the radiator	Antenna 1	11.16–11.23	–
	Antenna 2	3.808–12.456	4.957–6.332
	Antenna 3	3.000–11.342	4.753–9.354
	Antenna 4	3.556–11.985	5.056–6.694

Reference	Antenna Structure	Antenna Size $(µ m^{3})$	Operating Frequency (THz)	RE (%)	Peak Gain (dBi)	Filtering Characteristics	Tunability in Filtering Band
[40]	${G r a p h e n e / S i O}_{2}$	$120 \times 140 \times 3.9$	0.8–3.34	–	–	no	no
[43]	${M e t a l / g r a p h e n e / S i O}_{2}$	$180 \times 160 \times 10$	0.17–4.21	55	2.4	yes	no
[44]	${G r a p h e n e / S i O}_{2}$	$120 \times 60 \times 50$	2.5–3.5	21.5	3.17	no	no
[45]	${G r a p h e n e / S i O}_{2}$	$60 \times 60 \times 1.6$	5–15	–	–	no	no
[46]	${G r a p h e n e / S i O}_{2}$	$120 \times 93 \times 25$	0.9–1.2	44	2.45	no	no
[24]	Graphene/quartz	$532 \times 500 \times 70$	0.68–1.63	–	7.45	no	no
[47]	${D R / g r a p h e n e / S i O}_{2}$	$50 \times 50 \times 17.85$	7.76–12.5	–	8.15	no	no
[34]	${M e t a l / g r a p h e n e / S i O}_{2}$	$20 \times 24 \times 1.9$	4.76–19	80	6.4	yes	yes
This work	${M e t a l / g r a p h e n e / S i O}_{2}$	$50 \times 50 \times 3$	3.56–11.98	90	6.6	yes	yes

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Applied Optics