Double-ring slot antenna with tree-shaped coupling strip for WLAN 2.4/5-GHz dual-band applications

Liu, Ji‐Chyun; Zeng, Bing-Hao; Wu, Ching-Yang; Chang, Dau‐Chyrh

doi:10.1002/mop.21173

Cited by 17 publications

(19 citation statements)

References 11 publications

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“…In recent years, many annular ring slot antennas have been developed for dual-frequency operations [1][2][3][4][5][6][7][8][9][10][11][12][13], and several of methods have been used to create antenna with dual-band characteristic. One of the typical methods is to introduce another concentric annular-ring slot [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…One of the typical methods is to introduce another concentric annular-ring slot [1][2][3][4][5][6]. However, in order to obtain the dual-band input impedance matching, some other structures should be embedded into the antenna, such as circular photonic bandgap (PBG) structures [3], tree-shaped coupling strip with branches [5] and a cross-slot [6]. There are many other methods to generate dual-band function, such as using triplate feed [7,8], introducing a back-patch [9], utilizing pin diodes [10], changing the compact annular ring slot structure [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…All these antennas provide a better impedance match but have some drawbacks of comparatively complex structures [3, 6-8, 10, 13], high profile [7,8], and a large ground plane [9,12]. On the other hand, there are many classic papers introducing the basic analysis methods of the printed and slot antennas [14][15][16][17], and the operation modes analysis using cavity model of annular ring antennas are also introduced [5,7,8,18], which provide a physical insight for understanding the behavior of the antennas. Besides, the antennas with similar structure but different operation modes compared with annular ring slot antennas are introduced [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Design and Investigation of a Dual-Band Annular Ring Slot Antenna for Aircraft Applications

Sun¹,

Sun²,

Zhang³

et al. 2013

PIER C

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Abstract-A novel dual-band annular ring slot antenna is investigated. The antenna consists of a center-fed circular microstrip patch antenna with a coupled annular ring. And it is shorted concentrically with a set of conductive vias. By adjusting the parameters of the antenna, the dual resonant frequencies for two modes (TM 01 and TM 02 modes) are achieved. The antenna is fabricated and tested. Results show that the proposed antenna with height of 0.0217λ 0 can provide gains of 3.01 dBi at 2.6 GHz (the receiving frequency) and 5.74 dBi at 2.95 GHz (the transmitting frequency). Good agreement between the measurement and simulation for the return loss and radiation patterns is achieved. The proposed antenna has dual-band characteristics, simple structure, low profile, and omni-directional azimuth radiation pattern. It is suitable for aircraft both receiving and transmitting signals and frequency division duplex (FDD) applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and Investigation of a Dual-Band Annular Ring Slot Antenna for Aircraft Applications

Sun¹,

Sun²,

Zhang³

et al. 2013

PIER C

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“…For implementations, configurations such as printed dipole [1], F-shaped monopole [3], stack inverted-F monopole [2,5,18], double-T monopole [6,7], rectangular slot [8], reconfigurable geometry [9], double S-shaped monopole [10], triangular slot [11], G-shaped monopole [12], C-shaped monopole [13], double ring slot [14], hock-shaped monopole [21], rectangular dielectric resonator [22], shorted parasitic patches [15], double slot-ring [17], loop monopole [18], slotted-patch monopole [19], ring monopole [20], and circular monopole [23] etc., have been developed for WLAN dual-band applications. In which, the stack inverted-F antenna usually be applied for the PCMCIA network card because of the advantage of low profile, low cost, good 50 ⍀ matching, capable integration with circuits and easy mounted [2].…”

mentioning

confidence: 99%

Fractal monopole‐like antenna with series Hilbert‐curves for WLAN dual‐band and circular polarization applications

Bor¹,

Lu²,

Liu³

et al. 2009

Micro & Optical Tech Letters

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A novel design of fractal monopole‐like antenna with series Hilbert‐curve configuration is proposed for 2.45/5.35 GHz dual‐band and circular polarization applications in this article. The compact fractal antenna consists of five series Hilbert‐curve and the monopole couplings, and exhibits the desired dual‐band 2.45 GHz (BW = 85 MHz, 3.45%) and 5.35 GHz (BW = 240 MHz, 4.46%), respectively, for IEEE 802.11a/b/g WLAN applications. The circular polarizations for dual‐band are demonstrated with AR spectrum and electric field intensities. Results included with frequency responses, radiation patterns, and electric field intensities are presented and discussed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 876–880, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24204

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Racial disparity in death from colorectal cancer

Fiscella

Winters

Tancredi

et al. 2010

Cancer

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Background The reasons Blacks have higher mortality rates from colorectal cancer (CRC) than non-Hispanic Whites are not fully understood. Blacks have higher rates of vitamin D deficiency than non-Hispanic Whites, and vitamin D deficiency has been associated with CRC. We investigated the association of vitamin D deficiency with excess risk for CRC mortality for Blacks in the third National Health and Nutrition Examination Survey (NHANES III) 1988–1994. Methods We examined the association of serum 25(OH) D levels with CRC mortality and its contribution to elevated risk among Blacks using baseline data from NHANES III and CRC mortality through 2006 from the National Death Index. Using survival models, we examined the adjusted risk for African Americans for CRC death with and without adjusting for vitamin D deficiency, defined as less 25(OH)D < 20 ng/dl. Results Black race (Hazard Ratio [HR] 2.03; 95% Confidence Interval [CI] 1.04–3.95), age (HR 1.12; 95% CI 1.09–1.15), not having health insurance (HR 2.45; 95% CI 1.12–5.36), and history of CRC (HR 7.22; 95% CI 2.12–24.6) predicted CRC mortality. When added to the model, vitamin D deficiency was significantly associated with CRC mortality (HR 2.11; 95% CI 1.11–4.00) and the effect of race was decreased (HR 1.60; 95% 0.87–2.93); the 40% attenuation was statistically significant (F[1, 49] = 4.85, p = 0.03). Similar results were seen when participants with a history of CRC were excluded from the analysis. Conclusion Our findings are consistent with the hypothesis that vitamin D deficiency contributes to excess African American mortality from CRC.

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Double-ring slot antenna with tree-shaped coupling strip for WLAN 2.4/5-GHz dual-band applications

Cited by 17 publications

References 11 publications

Design and Investigation of a Dual-Band Annular Ring Slot Antenna for Aircraft Applications

Design and Investigation of a Dual-Band Annular Ring Slot Antenna for Aircraft Applications

Fractal monopole‐like antenna with series Hilbert‐curves for WLAN dual‐band and circular polarization applications

Racial disparity in death from colorectal cancer

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