Internal folded loop antenna with tuning notches for GSM/GPS/DCS/PCS mobile handset applications

Abstract

A novel compact quad-band internal antenna for mobile handsets operating the , GPS (1575 Ϯ 10 MHz), DCS (1710 -1880 MHz), and PCS (1850 -1990 bands is proposed and implemented. The proposed antenna consists of a feeding strip, shorting strip, and folded loop radiating element with embedded tuning notches. Embedding the notches changes the current flow on the surface of the loop radiator so that the resonant frequencies can be controlled independently by their size and position. The measured impedance bandwidth (VSWR Ͻ 2) of the proposed antenna is 11.3% at GSM band and 27.4% at higher bands including GPS/DCS/PCS. The measured peak gains are 0.51, 2.06, 0.52, and 1.34 dBi, at the GSM, GPS, DCS, and PCS bands, respectively. ABSTRACT: We describe high-efficiency gratings illuminated by incident lights in the C ϩ L bands as the (de)multiplexers for dense wavelength division multiplexing (DWDM) application. This grating is fabricated in fused silica and replicate in polydimethylsiloxane (PDMS) and polyethylene terephthalate glycol (PETG) with the technology of nanoimprint.

Capacitor-Inductor-Loaded, Small-Sized Loop Antenna for Wlan Notebook Computers

“…Loop and folded loop antennas have been favorable to applications in WLAN access points [16][17][18][19][20][21][22] and mobile phones [23][24][25][26][27] owing to their self-balanced structure of one-wavelength loops [16][17][18][19][20][21][22] and offering multi-resonant modes [23][24][25][26]. These loop antennas mainly operate at their half-, one-, and one-half-wavelength resonant modes, which make them larger than those quarter-wavelength antennas [1][2][3][4][5][6][7][8][9][10][11][12] and can not meet the size requirement as mentioned.…”

Very‐small‐size printed loop antenna for GSM/DCS/PCS/UMTS operation in the mobile phone

“…In the recent studies [1][2][3][4][5][6][7], the loop antennas have been shown to be promising candidates for application in the mobile phone as internal multiband antennas with reasonable occupied size. These multiband loop antennas are generally achieved by printing the desired loop metal pattern on the system circuit board or thin dielectric substrate [1][2][3], forming the loop metal pattern on the surfaces of the chip base as surface-mount elements [4], or mounting the loop metal strip above the system ground plane of the mobile phone [5][6][7]. For these reported loop antennas, however, they are mainly operated at their 0.5-wavelength resonant mode to form the antenna's lower band to cover GSM (890 -960 MHz) operation.…”

Multiband Folded Loop Antenna for Smart Phones

“…However, the current variation due to the device being hand-held and the resulting body proximity effect degrades antenna performance since the resonating currents are spread out over the system ground plane [1,10]. To avoid degrading antenna performance, a printed loop antenna is another candidate for the mobile phone since the current induced on the ground plane is small [11][12][13][14][15][16][17].…”