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多频微波天线

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(tuning strips) patch patch

patch (MEMS switch) on/off patch

patch patch

patch K 28GHz 30GHz

Abstract
The paper is to propose methods of using micromachining technologies to develop a multi-frequency microstrip patch antenna. The rational of tuning frequency for the antenna is by placing some small tuning strips beside of the patch and by installing the corresponding MEMS micro switch to adjust the coupling level between the tuning strips and the patch. Therefore, the resonant length of the patch can be tuned to obtain variable resonant frequency. The simulations by a EM software package are implemented to find the range of the tuning frequency and the quantitative relationships among the dimensions of the tuning strips, the distance of the tuning strips away from the patch, and the coupling height of the micro switch. The design case is for a microstrip patch antenna in K band. The simulation results show the tuning range is from 28GHz to 30GHz.

1980

0.01~0.05 free-space wave length [1-3]

patch [4-6] patch (1) [7-8]

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1 4 Patch p-type

100

on/off

patch

(Input impedance) (tuning strip) K 28GHz 30GHz patch (L×W) 1.35mm 1.8mm (y1) 0.7mm (W1) 0.3mm (L1×W) 0.06mm 1.8mm patch (d) 0.03mm (2) [9-12]
L d L1

y1

W1

W

a
2
h

(g)

2.b 1 2.c a. b.

b

(3) multilayer method of (FEM)[13]

moment(MoM)

fr

c 2 L H reff

(1)
upper electrode

a
g

c L fr

(3×1010 cm/sec) patch

H reff
3 (1) (L) patch patch 2 patch

lower electrode

contact

b

c
a.

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b. c. (off state) (on state) patch (d)

Patch antenna MEMS switch

1 Case A B C D E

L 1.35 1.35 1.35 1.35 1.35

W 1.8 1.8 1.8 1.8 1.8

L1 0.06 0.03 0.015 0.015 (

d 0.03 0.03 0.03 0.015 mm)

tuning strip
A B D E
6 0.

Smith Chart
1.0
2. 0

MEMS switch

Patch
-0. 2
-10.0

MEMS switch

.4 -0

-0

.6

Ground

.0 -2

b
3 a. b.
Return Loss (dB)
0 -5 -10 -15 -20 -25 -30 27 27.5 28

Swp Min 27GHz

-0.8

-1.0

a

A B C D E
28.5 29 29.5 30 30.5 31

(tuning strip) (d) (g)

(1) patch (2)

Frequency (GHz)

(1)

patch 4 (g = 0) patch (L1) (d) 4 (d) 1 A B (L1) (2) C D a. Smith Chart b. Return Loss

b
(tuning strip)

C

(d = 0.03 mm)

(g)

-4 .0 - 5. 0

10.0
-3 .0

a
0.2 0.4 0.6 0.8 1.0 2.0 3.0 4.0 5.0 0

0. 4

MEMS switch

C

Swp Max 31GHz
0 3.

0.8

4.
0.2

0

5.0
10.0

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( L×W = 1.35mm 1.8mm y1 = 0.7mm W1 = 0.3mm L1×W = 0.06mm 1.8mm d = 0.03mm) on/off 2 5 patch (tuning strips) patch patch Return Loss 2 Case g A 0 B C D E F G 1 ( m) H patch (MEMS switch) (g) patch

a. Smith Chart b. Return Loss

0.01 0.05 0.1 0.25 0.5

A B C
0. 4

E F G H
6 0.

Smith Chart
1.0

1/3

2/3

Swp Max 31GHz
0 3.

0.8

D

2.

0

patch
4. 0
5.0
10.0

(tuning Smith Chart patch

strips)

.4 -0

.6

-0

-0.8

0 -5

-1.0

a
A B C D E F G H
-30 27 27.5 28 28.5 29 29.5 30 30.5 31

Return Loss (dB)

-10 -15 -20 -25

.0 -2

Swp Min 27GHz

Frequency (GHz)

b
5 (g)

-4 .0 - 5. 0

2 -0 .

-10.0

10.0
-3 .0

0.2

0.4

0.6

0.8

1.0

2.0

3.0

4.0 5.0

0

0.2

patch (MEMS switch)

patch (tuning strip) K

patch 27.8GHz 29.8GHz

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Weight Wireless System Based on the RF MEM Switches," proceed. IEEE MTT-S, pp.175-180, 1999. [13] J. –G. Yook, N. Dib and L. Katehi, "Characterization of High Frequency Interconnects Using Finite Difference Time Domain and Finite Element Methods " IEEE Transactions on Microwave Theory and Techniques, Vol. 42, pp.1727-1736, Sep 1994.

(GPS)

(radar) (vehicular communication)

[1] I. J. Bahl and P. Bharitia, Microstrip Antennas, Artech House, Dedham, MA,1980. [2] R. J. Mailoux, J. F. McIlvenna, And N. P. Kernweis, "Microstrip Array Technology," IEEE Trans. Antennas and Propagation, Vol. 29, pp.25-38, 1981. [3] J. R. James and P. S. Hall, Handbook of Microstrip Antennas, Perter Peregrinus, London, 1989. [4] D. Epperson et al., (Ericsson corp.), Antenna Assembly for Radiotelephonic Device, US patent No. 5752204, May 12 1998. [5] N. Herscovici, "New Considerations in the Design of Microstrip Antennas," IEEE Trans. Antennas and Propagation, Vol. 46, No. 6, pp.807-812., 1998 [6] A. Ando, Y. Honma, K. Kagoshima, "A Novel Electromagnetically Coupled Microstrip Antenna with a Rotatable Patch for Personal Handy-Phone System Units," IEEE Trans. Antennas and Propagation, Vol. 46, No. 6, pp.794-797, 1998 [7] Drayton, R.F.; Papapolymerou, I.; Katehi, L.P.B., "Microstrip patch antennas on micromachined low-index materials," Antennas and Propagation Society International Symposium,. Vol: 2 , pp.1220-1223, 1995 [8] Zheng, M.; Chen, Q.; Hall, P.S.; Fusco, V.F., "Broadband microstrip patch antenna on micromachined silicon substrates, " Electronics Letters, Vol. 34 No. 1, pp.3-4, 8 Jan. 1998 [9] E. R. Brown, "RF-MEMS Switches for Reconfigurable Integrated Circuits," in IEEE Transactions on Microwave Theory and Techniques, Vol. 46, No.11, pp.1868-1880, November 1998. [10] J. J. Yao and M. F. Chang, "A Surface Micromachined Miniature Switch For Telecommunications Applications With Signal Frequencies From DC Up To 4 Ghz," in Transducers '95, pp.384-387, June 1995. [11] C. L. Goldsmith, Z. Yao, S. Eshelman and D. Denniston, "Performance of Low-Loss RF MEMS Capacitive Switches," in IEEE Microwave and Guided Wave Letters, Vol. 8, No. 8, pp.269-271, August 1998. [12] H. Izadpanah, B. Warneke, R. Loo, G. Tangonan, "Reconfigurable Low Power, Light


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