| The Ka band Transmit/Receive (T/R) module has been widely applied in battlefieldidentification radar systems,with the short wavelength, wide bandwidth of millimeterwave and its intrinsic atmospheric propagation characteristics. The T/R modulegenerally consists of up-conversion, down-conversion, power amplifier, low noiseamplifier and pulse modulation. Therefore, the miniaturization, high integration, highreliability and low cost of T/R module are more important.Low Temperature Co-fired Ceramic (LTCC) technology and three dimensionalintegration technologies are excellent methods to meet these requirements. LTCCtechnology can improve the integration of high-performance passivemodule with the RF chip for microwave multichip modules (MMCM). For Ka-band T/Rmodule applied in the millimeter wave battlefield identification radar systems, TheLTCC multi-chip hybrid integration that effectively and reliably integrating highperformance passive functional devices with the RF chip monolithic integrated circuit(MMIC) offer smaller volume and more flexibility.This paper proposes appropriate method for the design of LTCC millimeter wavecircuits by the tolerance analysis and mode optimization based on the theory oftransmission line. The method can solve the difficulties of application in millimeterband and reduce the volume and weight of millimeter-wave T/R. Such contentsinvolved in this dissertation are as following:1. LTCC diplexer: The miniaturized semi-lumped diplexer based on LTCCtechnology is proposed. It is composed of L-band low-pass filter based on lumpedelements and X-band SIR band-pass filter. The measurement results as follows:the cutoff frequency is1.46GHz and insertion loss less than1dB in the L-band; thecenter frequency is8.3GHz with the bandwidth of0.6GHz, and the insertion loss is lessthan3.5dB. The diplexer has the advantages of simple structure, small size andgood electrical properties, and has been applied in Ka-bands T/R module to diplextransmission the IF frequency and the LO frequency.2. Substrate integrated waveguide (SIW) filter: The third order cross-coupled millimeter-wave filter based on SIW by three-dimensional LTCCtechnology are introduced, and a novel transmission, resonant coupling structure areproposed. A substrate integrated folded waveguide (SIFW) H-plane band-pass filterbased on LTCC is designed and fabricated. The measured results prove the feasibility ofthis kind of filter structure.3. Wideband Bandpass Filter With Enhanced Wideband Rejection UsingTriple-Mode Ring Resonator: his paper presents a novel triple-mode ring resonatorwideband bandpass filter with enhanced wideband rejection characteristics. Theproposed ring resonator is made up of step impendence resonator and triple-mode ringresonator. The resonator has three resonance frequencies in the passband and exhibitsattenuation poles close to the edges of the passband which offer sharp rejection in thisbandpass filter.4. LTCC microwave and millimeter-wave T/R: Low temperature co-firingceramics have the characteristics of high density, small size and low cost, and they havebetter flexibility in terms of three-dimensional design, so LTCC technology has a goodprospect of application in the L-band. L-band and X-band T/R module using LTCCtechnology is designed and fabricated in this paper. High-density reliable and effectiveintegration based on the investigation of the millimeter-wave transmissionstructure on LTCC, LTCC filter, LTCC diplexer and other passive functional modulesare proposed. A T/R module based on LTCC technology for millimeterwave battlefield identification radar system is presentation. We gain a finer measuredresult by layout analysis and processing tests.
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