Low-Profile Printed Octa-Band LTE/WWAN Mobile Phone Antenna Using Embedded Parallel Resonant Structure

Small-Size Wideband Monopole Antenna With CRLH-Tl for Lte Mobile Phone

“…Compared with LTE antennas in the terminal devices in [1][2][3][4][5][6][7][8][9][10], the monopole which consists of two arms and loaded CRLH-TL has a relatively simple structure. The left arm is designed to resonate at around 800 MHz, so the electrical length of the antenna's left arm should be approximately a quarter of the wavelength at the lowest frequency, i.e., at 0.74 GHz which is about 90 mm.…”

“…Additional losses are usually inevitable in antenna with lumped elements which may deteriorate the antenna efficiency. Parasitic element and meandered structures are also employed to design wide-band and miniaturized antennas by introducing new resonant modes [7,8]. Monopole reported in [7] uses a parasitic element, meandered strips, added branched structures and a lumped component.…”

“…In the last decade, composite right and left handed transmission line (CRLH-TL) which develops from left-handed materials (LHMs) has been applied in some microwave circuits and antenna [8][9][10][11][12]. Left-handed materials possess unique electromagnetic (EM) properties such as anti-parallel phase, group velocities, and zero propagation constant, with which abnormal radiation, size reduction and wideband antenna can be realized.…”

Small-Size Folded Monopole Antenna With Switchable Matching Circuit for Ultra-Thin Mobile Applications

“…To achieve multiband performances with very low profile of approximately 3 mm above the circuit board, simple techniques, such as bending the monopole, are applied [1,2]. However, to further improve the lower operating band for covering LTE700 and GSM850/900 bands, further techniques such as embedding a parallel resonant structure and loading an additional chip inductor into the antenna are also employed into the antenna designs.…”

Two-Strip Narrow-Frame Monopole Antenna With a Capacitor Loaded for Hepta-Band Smartphone Applications

“…Until now, various types of technologies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have been proposed for multi-band smartphone applications, such as loaded lumped chip elements [4,5], distributed inductive strips [6,7], coupled-fed feeding [8][9][10][11][12][13], LC matching circuits [14][15][16], parallel resonant structures [17,18] and reconfigurable antennas [4,19,20]. All these technologies can reduce the sizes of the antennas and enhance the operating bandwidth.…”