Effective Structure of a Push-push Oscillator Using a Hair-pin Resonator for K-band Application 1
Jun-Ha Hwnng, 'Ja-So0 Cho, 'Jong-Heon Kim, 2 Jong-Chol Lec, Bok-Ki Kim, 2Nain-Young Kim, and 'Ui-Seok Hong I Microwave Communications & Components Inc. 141: Prime Ccnter, #546-4 Guui-dong, Kwangjiin-ku, Seotil 143-200, Korca 2 RFIC/MMIC Kesearch & Education Center, Kwangwoon Univ. 447- I Wolgye-dong, Nowon-ku, Seoul 139-701, Korca E-mail :
[email protected]. 2
ABSTRACT In this paper, a K-band push-push oscillator is designed and iniplemcntcd with the form of series feedback, which has good coupling efficiency and oscillation frcq~iency stability. The osciltator shows the. output power of 1.17 dRm, thc fimdamental
analyzed by the following parameters as shown in Fig. 1.
frequency suppression of 24.17 dl3c at 18.37 (31-12, and the phase noise of -100 dBc/I,Iz at offset frequency of IOU kHz. 1.
(1)
Fig
INTRODUCTION
Active devices on IC-band applicatioi~s have been activated with the advailced wireless and satellite communication of the microwave band [I]. The signal in this range of frequency is very hard to be obrained by single oscillator due to its limitation of fabrication process for the hybrid microwave integrated circuits (HMIC). Instead, frequency doubling has been proposed for the oscillator output of microwavc or millimeter wave frequency [7, 31. One of thosc is the push-push method, in which the fiiiidaincntal signals of two outputs become out-of-phase and canceled-out, and the second harmonics become in-phase and added-up at output stage. Even though thc high Q dielectric resonator (DR) is a most popular resonator to be used in the oscillator design, it is not proper For the MMIC (Monolithic Microwave Integratcd Circuit) application because of its 3-I3 structure. In this papcr, a planar type of hair-pin resonator is adopted For the design of the K-band oscillator for the possibllily to the MMIC application. 11. A HAIR-PIN llESONATOR The ininiaturincd hair-pin rcsonator
0-7603-5761 -2/99/$10.00 Q1999 IEEE
can
be
1.
~lcctrical parameters
(2)
of
a
hair-pin
resonator. 2, : characteristic impedance o f microstrip line
0,
electrical length of microstrip line Z, ; even- and odd- mode characteristic impedances of parallet coupled line 0 Bpn : even- and odd- inodc electrical lengths of paraliel couplcd line The resonance conditions of hnir-pin resonators can be obtained by the ABCD matrices, which express a transmission tine and a capacitor [4]. The parameters for thc hair-pin resonator should satisfy the following equation when 0 U 8. ;
Z,,,
The hair-pin resonator can be expressed with odd mode and even mode at the resonant points as shown in Fig. 2. Parallel coupled lines with an open-circuited end are considered to have either an odd-mode or an even-mode electromagnetic field distribution a! resonance points.
452
Cdd mode
the return loss is -17.09 dB at 9.0 GHz.
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... :;.,+;:::.:
I.,.
..y...:...p....
i i .................. iy
