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为了加强抗邻道旁频干扰的能力,提高接收机的选择性,在接收机高频放大器中加入频带滤波器很有好处。但是在甚高频范围内,一般集中参数元件的电容、电感的品质因数急剧下降,不能制造高选择性矩形系数好的频带滤波器。压电晶体谐振器虽然具有高品质因数,但不能适用于宽频带通滤波器。因此,只能设计一种新型的、用于甚高频率范围的、高选择性低损耗的滤波器。目前,螺旋滤波器可以理想地达到这个要求。我们试制的这种螺旋滤波器适合于选址通信体制或其它高频宽带接收机能提高机器的抗干扰性和选择性。我们已初步做出这种滤波器,并开始应用于研制样机上,经实验室测试,性能良好,较为理想地达到技术指标要求。
In order to strengthen the ability to resist adjacent channel side-channel interference and improve the selectivity of the receiver, it is beneficial to add a band-filter to the receiver’s high-frequency amplifier. However, in the very high frequency range, the quality factor of the capacitance and inductance of the general concentration parameter element sharply drops, and the band filter with high selectivity and high squareness coefficient can not be manufactured. Piezoelectric crystal resonators, while having a high quality factor, can not be applied to wideband bandpass filters. Therefore, only a new, highly selective, low loss filter for the very high frequency range can only be designed. Spiral filters can now ideally meet this requirement. Our prototype of this spiral filter for siting communication system or other high-frequency broadband receiver can improve the machine’s anti-interference and selectivity. We have initially made this filter, and began to be used in the development of prototype, the laboratory test, good performance, ideal to meet the technical requirements.