Folded loop antenna for mobile hand-held units

Katsibas, Konstantinos; Balanis, C.A.; Tirkas, P.A.; Birtcher, Craig R.

doi:10.1109/8.660971

Cited by 62 publications

(18 citation statements)

References 19 publications

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“…6 have generally large heights for mobile communication systems. In order to reduce the height of the monopoles, several different wire type antennas such as helical, wound coil or folded loop antennas are used for multiband operations (Katsibas et al, 1998;Lee et al, 2000). Among these antennas, helical antenna, which is given in Fig.…”

Section: Monopole (Whip) and Helical Antennasmentioning

confidence: 99%

Multiband and Wideband Antennas for Mobile Communication Systems

Seçmen¹

2011

Recent Developments in Mobile Communications - A Multidisciplinary Approach

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Section: Monopole (Whip) and Helical Antennasmentioning

confidence: 99%

Multiband and Wideband Antennas for Mobile Communication Systems

Seçmen¹

2011

Recent Developments in Mobile Communications - A Multidisciplinary Approach

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“…The proposed design uses the printed loop structure, which has been known to be capable of resulting in small excited surface current distributions on the system circuit board of the mobile phone [7][8][9][10][11][12][13][14][15][16][17][18]. This behavior is expected to result in decreased user's hand effects on the radiation efficiency of the internal antenna [7].…”

Section: Introductionmentioning

confidence: 99%

Small‐size printed loop antenna for penta‐band thin‐profile mobile phone application

Chen

2009

Micro & Optical Tech Letters

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figure) is similar to the AR curve in ϭ 0Њ plane. It is seen that in the peak gain direction ϭ 90Њ, where AR ϭ 1 (or 0 dB) in theory, the measured value AR ϭ 1.1 (or 0.8 dB) is quite close. Within the beamwidth region (or Ϫ3 dB-angular sector) of the gain radiation pattern AR is less than 1.41 or 3 dB, which is well within the customary requirements for medium-gain antennas with circular polarization [9]. CONCLUSIONSIn this article a folded-wire X antenna is introduced and applied for construction of a low-profile directive flat-reflector antenna. The two orthogonal input ports of the X antenna produce the same gain radiation patterns but different orthogonal polarizations. Both ports of the studied UHF X antenna model have equal input impedances of about 160 ⍀ at resonance. Because of its structural symmetry, the X antenna possesses very large inter-port and far-field crosspolar isolations. The single-port fed X antenna behaves like a half-wave dipole and the double-port fed X antenna acts as an array of two crossed dipoles.The low-profile X antenna located in front of a flat reflector has a very simple feed circuit, where both ports are connected to two 50-⍀ coaxial cables (loads) in balun-like manner. Compared with the standard reflector antenna with an active element (dipole, loop, and X antenna) located at a distance of 0.25-0.35 wavelengths, the low-profile reflector X antenna features about 2.5-3.0 dB higher gain, and thus, possesses an useful super-directivity. In addition, the reflector X antenna has much better input and cross-polar isolation compared with the similar low-profile array of two folded half-wave dipoles located in front of the same-size flat reflector.Future applications of the folded-wire X antennas may include linear or circular polarization diversity RF/microwave earth or satellite communication and measurement systems, radars, etc.

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“…Moreover, in order to satisfy the demand of compactness and versatility, folded loop [2], meandered [3] and bent folded [4] monopole antennas have been successfully used in wireless mobile communication systems.…”

Section: Introductionmentioning

confidence: 99%