Small-size Monopole Antenna Research Articles

Small size monopole antenna with tri-band notch characteristics for broadband application

Abstract In this research article, the design of a broadband monopole antenna with triband notch characteristics is proposed. Notch characteristics are achieved by using an E-shaped slot on the patch and a U-shaped slot on the 50 Ω microstrip feed line. An E-shaped slot is introduced on the metal patch to reject one frequency band of 6.6 − 7.5 GHz and when an additional U-shaped slot is introduced on the microstrip feed line, it provides two-notch frequency bands of 4.8 − 5.7 GHz and 14.2 − 17.5 GHz. The notch bands are effectively used to avoid undesired interference from the WLAN, C band, and Ku band. The proposed antenna provides a very broad frequency range from 3.3 − 19.5 GHz except for three notch bands. The antenna is small in size and easy to design with only a volume of 29 mm × 21mm × 1.6 mm. The antenna is useful for broadband applications.

Small-size LTE/WWAN monopole antenna with octa-band operation for 4 G mobile phone

By introducing a modified F-shaped feeding strip and dual parasitic shorted strips, a small-size wireless wide area network/long-term evolution (WWAN/LTE) printed antenna is proposed and embedded in the 4 G mobile phone with octa-band operation. The operating impedance bandwidths (RL ≥ 6 dB) of 263/1093 MHz can be obtained across the LTE/WWAN bands, respectively. The overall antenna size of the proposed printed monopole antenna (MA) is only 35 × 10 × 0.8 mm3. Meanwhile, this small-size MA provides the measured peak gains and antenna efficiencies of 2.0/3.6 dBi and 80/75% for the LTE/WWAN bands, respectively.

Planar small-size LTE/WWAN tablet computer antenna with eight-band operation

By attaching a C-shaped parasitic monopole strip on the backside of the antenna, a novel compact eight-band monopole antenna (MA) is proposed and embedded in the LTE/WWAN tablet computer. The operating impedance bandwidths of 264/997 MHz can be obtained across the LTE/WWAN bands, respectively. Given that the overall antenna size is only 35 × 10 × 0.8 mm3, the proposed planar MA provides more than 22% reduction in antenna size over that of the conventional ones. Meanwhile, this small-size MA provides the measured peak gains and antenna efficiencies of 2.0/3.2 dBi and 60/66% for the LTE/WWAN bands, respectively. Additionally, to fulfill the limitation of 1.6 W/kg of the 1-g body specific absorption rate (SAR) requirement for mobile device applications, the proposed planar compact MA is deposited inside the tablet computer for the study of radiating performance.

Planar Small-Size Eight-Band LTE/WWAN Monopole Antenna for Tablet Computers

This work describes a novel small-size monopole antenna with eight-band LTE/WWAN operation in tablet computers by introducing a G-shaped driven monopole strip. The subsequently obtained impedance bandwidths across dual operating bands approach 264/1046 MHz at the LTE and WWAN bands, respectively. Given that the overall antenna size is only 35 ×10 ×0.8 mm 3 , the proposed planar monopole antenna provides more than 40% reduction in antenna size over that of the conventional ones. Additionally, the measured peak gains and antenna efficiencies are approximately 3.6/5.2 dBi and 67/70% for the LTE/WWAN bands, respectively. Moreover, the proposed planar compact antenna can be deposited inside the tablet computer and fulfills the body specific absorption rate (SAR) requirement (for 1-g body tissue) for mobile device applications.